GE 735, 737 Instruction Manual

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Page 1

735 / 737

FEEDER PROTECTION RELAY

INSTRUCTION MANUAL

Software Revision: 25D154D1.000

Manual P/N: 1601-0048-DE (GEK-106291A)

180

220

180

220

TIME 51 INST 50

N I

Y L

T A

R E

200

N I

Y L

T A

R E

200

TRIP

CLEAR

CURVE SHAPE

F I

N I

CURVE SHAPE

F I

N I

STATUS

RELAYIN SERVICE

SERVICE REQUIRED

PHASE PICKUP

GROUND PICKUP

PICKUP

(% OF CT)

130

120

PICKUP

(% OF CT)

130

120

150

OFF OFF

150

OFF OFF

737 Feeder Protection Relay

COMMUNICATION CURRENT

(% OF CT)

100% 90% 80% 70% 60% 50% 40% 30% 20% 10%

BAUD

19200

9600

2400

1200

6 7 8

ADDRESS

+16

TEST

PHASE

TIME MULTIPLIER

I N

GROUND

TIME MULTIPLIER

I N

INSTANTANEOUS

(x CT)

OFF

INSTANTANEOUS

(x CT)

OFF

803649A2.CDR

GE Power Management

215 Anderson Avenue, Markham, Ontario Canada L6E 1B3 Tel: (905) 294-6222 Fax: (905) 201-2098

Internet: http://www.GEindustrial.com/p m

Manufactured under an

ISO9001 Registered system.

Page 2

1 INTRODUCTION 1.1 OVERVIEW

1 INTRODUCTION 1.1 OVERVIEW 1.1.1 FEATURES

a) PROTECTION

• 3 separate phase time overcurrent (51) elements with 5 curve shapes: Definite time, moderately inverse, normal inverse, very inverse, extremely inverse.

• Phase instantaneous (50) element

• Ground time overcurrent (51G) with 5 curve shapes: Definite time, moderately inverse, normal inverse, very inverse, extremely inverse.

• Ground instantaneous (50G) element

• 10 curves for each shape

• 4 time multipliers for each curve

• 3 different curve types: ANSI, IAC, IEC/BS142

b) INDICATORS

Trip: Phase A, B, C instantaneous

Phase A, B, C time overcurrent Ground fault instantaneous Ground fault time overcurrent

Status: Relay in ser vice

Service required Phase pickup Ground pickup

Current bargraph: 10 to 100%

c) OTHER

• Conventional 1 A or 5 A CT input

•Drawout case

• AC or DC control power

• Seal provision for tamper proof settings

• Output contacts:

•Trip

•Aux Trip

• Service Required

(737 only)

•

• 50A, 50B, 50C, 50N

• 51A, 51B, 51C, 51N

• RS485 communications: settings, currents, status

• 86 lockout

• Programmable block instantaneous on autoreclose.

• Ground Fault trip programmable to Aux. Trip relay, separate from Main trip.

pickup, trip, cause of trip outputs;

GE Power Management 735/737 Feeder Protection Relay 1-

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1.1 OVERVIEW 1 INTRODUCTION

1.1.2 PRODUCT DESCRIPTION

The 735/737 is a microproce ssor based relay use d to perform pr imary circ uit prote ction on dis tributio n netw orks at any vol tage level. Instantaneous and time overcurrent phase and ground protection features replace the equivalent of 8 separate protection devices. Each protection element can be selectively enabled by front panel dial settings. Flexible settings and selectable curve shapes enable accurate coordination with other devices. Cause of trip indications and a bar graph load monitor are provided on the front panel.

A momentary dry contact closure from the 735/737 relay is used to activate the breaker trip coil in the event of a fault. To help determine the cause of a trip, separate indicators are provided for phase instantaneous, phase time overcurrent, ground fault instantaneous, and ground fault time overcurrent. These latched indicators remain set after a breaker trip. They can be reset by the front panel CLEAR button.

A special feature of t he 7 35/737 named "T ri p R ec ord" is the abi lity of the relay to se que nti all y d isp lay the last five caus es o f trips. To display the trips, press and hol d th e res et k ey. After 2 seconds, the front panel indicators will di spl ay the las t 5 trip s starting with the most recent.

The 735/737 has separately adjustable instantaneous and time overcurrent pickup levels. No intentional delay is added to the instantaneous trip. Fi ve sep arate ti me ov ercurren t curve shape s can be sel ected: defini te time , mode rate ly invers e, normal inverse, very inverse, and extremely inverse. For each curve shape, 40 different curves to produce different time delay levels can be selected using the time multiplier settings and curve shift. These allow selection of optimum coordination with fuses, feeders, motors, trans-formers, etc. To monitor load current, a front panel bar graph indicator is provided. It gives an indication of 10% of CT rating to 100% of CT in steps of 10%. This is useful for monitoring breaker loading and during testing.

Ground level and ti me del ay can be s ele ct ed for coordination with u ps tream de vi ce s. The ground signal is nor mally derived as the residual sum of the 3 phase CTs, eliminating the need for an additional ground sensor. Alternatively, for more sensitive detection, an additional core balance (zero sequence) ground sensor, encircling the 3 phase conductors, can be used. Like time overcurrent phase protection, 5 separate curve shapes and 40 curves for each shape are available for ground fault protection.

To accommodate more complex control schemes the 737 has 8 additional output relays to provide a separate dry contact output for each different protection element. That is, in addition to the 2 common trip contacts, the 737 has contacts for trip from:

51A, 51B, 51C, 51N, 50A, 50B, 50C, and 50N

These eight additional outputs can be programmed to activate:

• as a separate trip output for each 50/51 protection element

• as a latched cause of trip output for fault diagnosis interface to a SCADA

• when phase/ground current exceeds the pickup setting to warn of an impending trip Internal monitoring of the relay is continuous. When control power is applied and the relay is operating normally, the

"RELAY IN SERVICE" LED is on. Should a fault be detected, the "SERVICE REQUIRED" LED will light to indicate a problem. In addition, the failsafe SERVICE relay output will change state signalling a malfunction to a remote monitoring device such as a programma ble co ntrolle r. In this case the 735/737 relay shoul d be rep laced and se nt in fo r servi ce. As long a s the "SERVICE" LED is off and the "RELAY IN SERVICE" LED is on the relay is operating normally. If the test switch is on, the RELAY IN SERVICE LED will flash. When either the phase or ground time/overcurrent threshold is exceeded, a separate pickup indicator flashes which is useful for testing, and to warn of an impending trip.

Relay states can be monitored via the RS485 communication port. This allows relays to be linked together over a simple twisted pair wire to communicate with a PLC or computer using the Modbus protocol. Baud rate and a unique slave address are set via the front panel communications switches.

1-2 735/737 Feeder Protection Relay

GE Power Management

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1 INTRODUCTION 1.1 OVERVIEW

1.1.3 THEORY OF OPERATION

A block diagram of the 735/737 hardware is shown on the following page. A 16-bit single chip microcomputer handles data acquisition, input/output and con trol. Program memory, data RAM, 10 bit A/D and UART are internal to the microcomputer.

Phase and ground current are monitored via external CTs which are connected to internal interposing CTs for isolation and signal conditioning. Low pass filters, level shifters and gain amplifiers transform the input signal to a level suitable for conversion by the 10 bit A/D. A/D v alues are converted, using software, to the true RMS value of the input sinewave. Separate × 1 and × 10 gain amplifiers are continuously sampled by the A/D convertor with program logic dynamically choosing the appropriate range.

Eight rotary switches and 2 banks of DIP switches are periodically read and decoded to determine settings. Using the appropriate curve settings, the microcomputer computes instantaneous and time overcurrent values closing the trip relay when a trip value is reached. This relay will remain latched until all phase and ground currents have dropped to zero. True RMS current is calculated and bar graph segments are driven under program control to indicate the value. All output relays are driven in response to computed conditions. These drivers are opto-isolated and a separate relay supply is used to prevent noise coupling for external sources to the microcomputer.

To prevent possible lockup of the relay in case of abnormal transient conditions, a separate hardware timer is continuously reset by the microcomputer under normal conditions. In the event of the program hanging up, this external watchdog will time out and issue a system reset.

An internal UART buffered by an isolated RS48 5 dri ver c on trols the serial com mu nicat ions. Baud rate is selectable th roug h an internal timer. Like all other inputs/outputs transient protection is applied to ensure reliable operation under real conditions.

A flyback switching power supply generates multiple isolated supply voltages of +12 I/O, +5 digital, +12 analog and +5 RS485. T wo di f feren t versi ons are avail able to cove r the rang e 20 to 6 0 V DC or 90 to 300 V DC. Front end rec tificat ion an d filtering enable these supplies to also be used with 50/60Hz control power sources.

Structured firmware design running under a real time operating kernel ensures robust program operation under different conditions. It also contributes to bug free code maintenance.

GE Power Management 735/737 Feeder Protection Relay 1-

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1.1 OVERVIEW 1 INTRODUCTION

Figure 1–1: 735 BLOCK DIAGRAM

1-4 735/737 Feeder Protection Relay

GE Power Management

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1 INTRODUCTION 1.2 ORDERING

1.2 ORDERING 1.2.1 ORDER CODES

The CT secondary must be specified with an order as 1 or 5 amps. The RS485 communications interface is available with RS422 as an option. For 19" rack mount applications, single and dual cutout panels for mounting one or two relays are available. These are 3 units high (10.5") fo r 19- inc h ra ck m oun tin g, m ad e of 14 gauge steel and co me in ASA61 gray. See Section 2.1.1: MOUNTING on page 2–1 for dimensions of the relay and panels. For bench testing, the 735/737 can be ordered mounted in a portable case.

The GE Power Management order code is as follows:

T able 1–1: ORDER CODES

–

735 737––

Basic Unit 735

737

Phase CT Secondary

Ground CT Secondary

Control Power LO |

Options 485

The following additional accessories are available:

• 19-1 PANEL: Single cutout panel

• 19-2 PANEL: Dual cutout panel

• SCI: RS232 to RS485 convertor

| 1|| | 5|| |

–

| |

1 | | 5 | |

–

| |

HI |

422

DEMO

S S

Standard 735 Relay with 50/51, 50G/51G protection

737 Relay (same as 735 with 8 additional output relays) 1 A Phase CT secondaries 5 A Phase CT secondaries 1 A Ground CT secondaries 5 A Ground CT secondaries 20 to 60 V DC; 20 to 48 V AC at 50/60 Hz 90 to 300 V DC; 70 to 265 V AC at 50/60 Hz RS485 2-wire communications (standard) RS422 4-wire communications (optional) 735 Demo/Test case

• 3" Collar: SR series collar 1009-0055 3

-- -

• 1 " Collar: SR series collar 1009-0047 8

• Optional Mounting Kit: 1819-0030

1.2.2 ACCESSORIES

MANUAL P/N FIRMWARE REVISION RELEASE DATE

1601-0048-D1 735.D1 11/12/1992 1601-0048-D2 735.D1.2 12/08/1992 1601-0048-D3 735.D1.2 01/12/1993 1601-0048-D4 25D130D1.000 03/03/1993 1601-0048-D5 25D131D1.000 03/10/1993 1601-0048-D6 25D140D1.000 04/28/1993 1601-0048-D7 25D141D1.000 09/28/1993 1601-0048-D8 25D150D1.000 03/21/1994 1601-0048-D9 25D151D1.000 06/10/1994 1601-0048-DA 25D152D1.000 06/06/1995 1601-0048-DB 25D152D1.000 12/07/2000 1601-0048-DC 25D152D1.000 02/15/2001 1601-0048-DD 25D153D1.000 04/18/2001 1601-0048-DE 25D154D1.000 08/13/2001

1.2.3 REVISION HISTORY

GE Power Management

735/737 Feeder Protection Relay 1-5

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1.3 SPECIFICATIONS 1 INTRODUCTION

1.3 SPECIFICATIONS 1.3.1 PROTECTION

PHASE TIME OVERCURRENT (51)

Pickup level: LO: 20 to 100% of CT rating or OFF

HI: 110 to 220% of CT ratin Curve Types: ANSI, IAC, IEC/BS142 Curve shapes: definite time, moderately inverse, normal, inverse, very inverse, extremely inverse.

See time/overcurrent curves; curves apply up to 20 x pickup or 20 x CT, whichever is less. Time multiplier: 10 curves: #1 to #10 for each shape

4 shift multipliers: 0.5, 0.8, 1, 1.1 Definite time: 100 ms to 1 sec. in steps of 100 ms. Reset: Time reset to zero each time current level falls below pickup threshold Accuracy: Level: ±3% of settin

Time: greater of ±3% or ±20ms at >150% of pickup

or OFF

PHASE INSTANTANEOUS OVERCURRENT (50)

Pickup level: 4, 5, 6, 8, 10, 12, 14, 16, 20 × CT or OFF Accuracy: Level: ±3% of settin

Time: 35ms maximum at >150% of pickup settin

GROUND TIME OVERCURRENT (51G/51N)

Pickup level: LO: 15 to 55% of CT rating in steps of 5% or OFF

HI: 60 to 100% of CT ratin Curve Types: ANSI, IAC, IEC/BS142 Curve shapes: definite time, moderately inverse, normal, inverse, very inverse, extremely inverse.

See time/overcurrent curves; curves apply up to 20 × pickup or 20 × sensor, whichever is less. Time multiplier: 10 curves: #1 to #10 for each shape

4 shift multipliers: 0.5, 0.8, 1, 1.1 Definite time: 100 ms to 1 sec. in steps of 100 ms Reset: Time reset to zero each time current level falls below pickup Accuracy: Level: ±3% of settin

Time: greater of ±3% or ±20ms at >150% of pickup

in steps of 5% or OFF

GROUND INSTANTANEOUS OVERCURRENT (50G/50N)

Pickup level: 0.1, 0.2, 0.4, 0.8, 1, 2, 4, 8, 16, × CT or OFF Accuracy: Level: ±3% of settin

Time: 35ms maximum at >150% of pickup settin

CURRENT INPUTS

Withstand Phase/Ground CTs:4 times rated current: continuous

20 times rated current: 5 second 40 times rated current: 2 second

: True RMS; 16 samples/cycle

Sensin Secondary: 1 A or 5 A (must be specified with order) Accuracy: Drift: No

reater of 3% of CT primary or 3% of displayed

reater than 0.5% over 10 years

CT BURDEN

1 Amp inputs: 0.02 VA at 1 A; 0.2 VA at 5 A; 10 VA at 20 A 5 Amp inputs: 0.02 VA at 5 A; 0.2 VA at 20 A; 10 VA at 100 A Conversion ran Frequency response: 48 to 300 Hz ± 3 dB

e: 0 to 20 times CT primary

1-6 735/737 Feeder Protection Relay

1.3.2 INPUTS

GE Power Management

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1 INTRODUCTION 1.3 SPECIFICATIONS

1.3.3 OUTPUTS

TRIP, AUX TRIP OUTPUT RELAYS

VOLTAGE MAKE/CARRY BREAK MAX LOAD

CONTINUOUS 0.2 S

DC Resistive 30 V DC 20 A 80 A 16 A 480 W

125 V DC 20 A 80 A 0.8 A 100 W 250 V DC 20 A 80 A 0.4 A 100 W

DC Inductive, L/R = 40 mS

AC Resistive 120 V AC 20 A 80 A 20 A 2400 VA

AC Inductive PF = 0.4

Configuration: Form A NO Contact Material: Silver Alloy

30 V DC 20 A 80 A 5 A 150 W 125 V DC 20 A 80 A 0.3 A 375 W 250 V DC 20 A 80 A 0.2 A 50 W

250 V AC 20 A 80 A 20 A 5000 VA 120 V AC 20 A 80 A 8 A 960 VA 250 V AC 20 A 80 A 7 A 1750 VA

SERVICE, PICKUP/CAUSE OF TRIP OUTPUT RELAYS

VOLTAGE MAKE/CARRY BREAK MAX LOAD

CONTINUOUS 0.2 S

DC Resistive 30 V DC 10 A 30 A 10 A 300 W

125 V DC 10 A 30 A 0.5 A 62.5 W 250 V DC 10 A 30 A 0.3 A 75 W

DC Inductive, L/R = 40 mS

AC Resistive 120 V AC 10 A 30 A 10 A 2770 VA

AC Inductive PF = 0.4

30 V DC 10 A 30 A 5 A 150 W 125 V DC 10 A 30 A 0.25 A 31.3 W 250 V DC 10 A 30 A 0.15 A 37.5 W

250 V AC 10 A 30 A 10 A 2770 VA 120 V AC 10 A 30 A 4 A 480 VA 250 V AC 10 A 30 A 3 A 750 VA

Configuration: Form C NO/NC Contact Material: Silver Alloy

1.3.4 POWER SUPPLY

CONTROL POWER

DC supply: HI: 125 V DC, 250 V DC nominal

e: HI: 90 to 300 VDC, 70 to 265 V AC

Ran

Power: nominal 10W, maximum 25W

LO: 48 V DC nominal

LO: 20 to 60 V DC, 20 to 48 V AC

GE Power Management 735/737 Feeder Protection Relay 1-

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1.3 SPECIFICATIONS 1 INTRODUCTION

INDICATORS

Phase time overcurrent trip A,B,C (latched) Phase instantaneous overcurrent trip A,B,C (latched) Ground fault time overcurrent trip (latched) Ground fault instantaneous overcurrent trip (latched) Relay in service Service required Phase pickup Ground pickup Current level LED bar

raph:10-100%

ENVIRONMENT

Operating temperature range: –40°C to +70°C

TYPE TESTING

Insulation Resistance: per IEC 255-5 (500 V DC, 2000 MΩ) Dielectric Stren Impulse Volta

e Immunity: per EN 61000-4-5 (common mode 4 kV, differential modes 2 kV)

Sur Oscillatory Sur

e Dips per IEC 61000-4-11 (0%, 40%, 70%)

Volta Electrostatic Dischar Damp Heat (Humidity Cyclic):per IEC 68-2-30 (6 days) Make and Carry for relays:per IEEE C37.90 (30 A) Current Withstand: per ANSI/IEEE C37.90 (40 × rated 1 A for 2 seconds; RFI Radiated Immunity: per IEC 255-22-3 (160 MHz, 460 MHz), per EN 61000-4-3 (10 V/m) RFI Conducted Immunity:per EN-61000-4-6 (10 V) Temperature Cycle: –40°C, +60°C (per GE internal procedures) Mechanical Stress: 2 Current Calibration: per GE internal procedures 10 A DC continuous relay current carry at 80°C per GE internal procedure

th: per IEC 255-5 and ANSI/IEEE C37.90 (2 kV at 60 Hz for 1 minute)

e per IEC 255-5 (5 kV)

e Withstand:per ANSI/IEEE C37.90.1, per Ontario Hydro A-28M-82

e: per IEC 255-22-2 (4/4 kV)

(per GE internal procedures)

It is recommended that the 735/737 relays be powered up at least once per year to avoid deterioration of electrolytic capacitors in the power supply.

NOTE

60 × rated 5 A for 1 second

1.3.5 MISCELLANEOUS

)

1-8 735/737 Feeder Protection Relay

GE Power Management

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These instruct ions do not purport to cover all details or variatio ns in equi pment no r provid

for every possible contingency to be met in connection with installation, operation, or main tenance. Should furth er info rma tion be desi red or shoul d par ticu lar prob lems aris e whi ch ar not covered sufficiently for the purchaser’s purpose, the matter should be referred to th General Electric Company.

To the extent required the products described herein meet applicable ANSI, IEEE, an NEMA standards; but no such assurance is given with respect to local codes and ordi nances because they vary grea tly.

Page 12

Page 13

1. INTRODUCTION

2. INSTALLATION

1.1 OVERVIEW

1.1.1 FEATURES................................................................................................1-1

1.1.2 PRODUCT DESCRIPTION........................................................................1-2

1.1.3 THEORY OF OPERATION................................ ........................................1-3

1.2 ORDERING

1.2.1 ORDER CODES........................................................................................1-5

1.2.2 ACCESSORIES.........................................................................................1-5

1.2.3 R EVISION HIST ORY .............. ............. ............. .............. .. ............. ............ 1-5

1.3 SPECIFICATIONS

1.3.1 PROTECTION ...........................................................................................1-6

1.3.2 INPUTS...................................................................................................... 1-6

1.3.3 OUTPUTS..................................................................................................1-7

1.3.4 POWER SUPPLY...................................................................................... 1-7

1.3.5 MISCELLANEOUS.................................................................................... 1-8

2.1 MECHANICAL

2.1.1 MOUNTING ...............................................................................................2-1

2.1.2 DRAWOUT RELAY....................................................................................2-3

2.1.3 PRODUCT IDENTIFICATION....................................................................2-4

2.2 ELECTRICAL

2.2.1 WIRING......................................................................................................2-5

2.2.2 CURRENT TRANSFORMERS ..................................................................2-8

2.2.3 OUTPUT RELAYS.................................... ........................................ .........2-8

2.2.4 COMMUNICATIONS ................................................................................. 2-8

2.2.5 CONTROL POWER.............................. ...................................................2-11

2.2.6 SYSTEM GROUNDING...................... ............... .............. ............... .........2-12

2.2.7 HI-POT TESTING.................................................................................... 2-12

3. SETUP AND OPERATION

3.1 FRONT PANEL

3.1.1 DESCRIPTION..........................................................................................3-1

3.2 CONTROLS

3.2.1 PHASE PICKUP [1]...................................................................................3-2

3.2.2 PHASE CURVE SHAPE [2].......................................................................3-2

3.2.3 PHASE TIME MULTIPLIER [3]..................................................................3-3

3.2.4 PHASE INSTANTANEOUS [4]..................................................................3-3

3.2.5 GROUND PICKUP [5]............................. ............... ............... .............. ....... 3-4

3.2.6 GROUND CURVE SHAPE [6]............................................ .......................3-4

3.2.7 GROUND TIME MULTIPLIER [7]......................................... ..................... 3-5

3.2.8 GROUND INSTANTANEOUS [8] .................... .............. ............... .............3-5

3.3 INDICATORS

3.3.1 STATUS INDICATORS [9]......................................................................... 3-6

3.3.2 TRIP INDICATORS [10].............................................................................3-6

3.3.3 PHASE CURRENT INDICATOR [12] .................. ............... .............. .........3-7

3.4 SWITCHES

3.4.1 COMMUNICATION [11].............................................................................3-8

3.4.2 OPTION SWITCHES [14] ..........................................................................3-8

3.5 SETUP PROGRAM

3.5.1 DESCRIPTION........................................................................................3-11

3.5.2 COMMUNICATE......................................................................................3-12

3.5.3 SETPOINTS EDITOR................... ...........................................................3-12

GE Power Management

735/737 Feeder Protection Relay i

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TABLE OF CONTENTS

3.5.4 SYSTEM CONFIGURATION................................................... ................ 3-13

3.5.5 STATUS................................... ........................... ............................ .........3-13

3.5.6 ACTUAL VALUES.................................................. ..................................3-14

3.5.7 SETPOINTS.......... ..................................................... ..............................3-14

3.5.8 COMMANDS................ ........................... ............... ........................... .......3-14

3.5.9 FILE ................................. ........................................ ................................3-15

3.5.10 INFO ......................... ........................................ ............................ ...........3-15

3.5.11 RETURN.......................... ........................... ............... .............. ............... .3-15

3.6 SETUP EXAMPLE

3.6.1 EXAMPLE REQUIREMENTS AND SETTINGS ...................................... 3-16

4. MODBUS COMMUNICATIONS

5. OVERCURRENT CURVES

4.1 OVERVIEW

4.1.1 DESCRIPTION ..........................................................................................4-1

4.1.2 ELECTRICAL INTERFACE .............................. ............... ..........................4-1

4.1.3 DATA FRAME FORMAT AND RATE ........................................................ 4-1

4.1.4 DATA PACKET FORMAT..........................................................................4-2

4.1.5 TIMING .................................. ........................................ ........................... .4-2

4.1.6 ERROR CHECKING..................................................................................4-3

4.2 SUPPORTED MODBUS FUNCTIONS

4.2.1 DESCRIPTION ..........................................................................................4-4

4.2.2 FUNCTION CODE 03: READ SETPOINTS............................................... 4-4

4.2.3 FUNCTION CODE 04: READ ACTUAL VALUES......................................4-5

4.2.4 FUNCTION CODE 05: EXECUTE OPERATION.......................................4-6

4.2.5 FUNCTION CODE 06: STORE SINGLE SETPOINT................................4-7

4.2.6 FUNCTION CODE 07: READ STATUS..................................................... 4-7

4.2.7 FUNCTION CODE 16: STORE MULTIPLE SETPOINTS..........................4-8

4.2.8 ER ROR RESPONS ES.................. .. ............. .. ............. .. ............. .............. .. 4-9

4.3 MEMORY MAP

4.3.1 MODBUS MEMORY MAP ....................................................................... 4-10

4.3.2 MEMORY MAP DATA FORMATS.................. ......................................... 4-12

5.1 OVERVIEW

5.1.1 DESCRIPTION ..........................................................................................5-1

5.2 ANSI CURVES

5.2.1 ANSI MODERATELY INVERSE CURVES................................................5-2

5.2.2 ANSI NORMAL INVERSE CURVES ......................................................... 5-4

5.2.3 ANSI VERY INVERSE CURVES...............................................................5-6

5.2.4 ANSI EXTREMELY INVERSE CURVES...................................................5-8

5.3 DEFINITE TIME CURVES

5.3.1 DESCRIPTION ........................................................................................5-10

5.4 IAC CURVES

5.4.1 IAC SHORT INVERSE CURVES.............. ........................... ............... .....5-12

5.4.2 IAC INVERSE CURVES................................................ ..........................5-14

5.4.3 IAC VERY INVERSE CURVES ........................................................ .......5-16

5.4.4 IAC EXTREMELY INVERSE CURVES...................................................5-18

5.5 IEC CURVES

5.5.1 IEC SHORT TIME CURVES......................... ............... ............................5-20

5.5.2 IEC A CURVES.............. ........................................ ..................................5-22

5.5.3 IEC B CURVES.............. ........................................ ..................................5-24

5.5.4 IEC C CURVES ........... .............. ............................................ .................. 5-26

ii 735/737 Feeder Protection Relay

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TABLE OF CONTENTS

6. TESTING

6.1 PROCEDURES

6.1.1 PRIMARY INJECTION TESTING.............................................................. 6-1

6.1.2 SECONDARY INJECTION TESTING........................................................6-1

6.1.3 COMMUNICATIONS TEST........................................... ............................6-1

6.1.4 PHASE CURRENT READING ACCURACY TEST ............ .......................6-1

6.1.5 GROUND CURRENT READING ACCURACY TEST................................6-1

6.1.6 INSTANTANEOUS PHASE OVERCURRENT PICKUP LEVEL TEST......6-1

6.1.7 INSTANTANEOUS GROUND FAULT OVERCURRENT PICKUP LEVEL

TEST..........................................................................................................6-1

6.1.8 INSTANTANEOUS PHASE OVERCURRENT TIMING TEST...................6-3

6.1.9 INSTANTANEOUS GROUND FAULT OVERCURRENT TIMING TEST.. 6-3

6.1.10 PHASE OVERCURRENT CURVE VERIFICATION ................... ...............6-3

6.1.11 GROUND FAULT OVERCURRENT CURVE VERIFICATION..................6-3

6.1.12 POWER LOSS/RECOVER TEST.............................. ................................ 6-3

6.1.13 HI POTENTIAL TEST................................................................................6-3

6.2 TEST RECORDS

6.2.1 735/737 TEST RECORD ...........................................................................6-4

6.2.2 COMMUNICATIONS TEST........................................... ............................6-4

6.2.3 PHASE CURRENT READING ACCURACY TEST ............ .......................6-4

6.2.4 GROUND CURRENT READING ACCURACY TEST................................6-4

6.2.5 INSTANTANEOUS PHASE OVERCURRENT PICKUP TEST..................6-5

6.2.6 INSTANTANEOUS GROUND OVERCURRENT PICKUP TEST..............6-5

6.2.7 INSTANTANEOUS PHASE OVERCURRENT TIMING TEST...................6-5

6.2.8 INSTANTANEOUS GROUND FAULT OVERCURRENT TIMING TEST.. 6-5

6.2.9 PHASE OVERCURRENT CURVE VERIFICATION..................................6-6

6.2.10 GROUND FAULT OVERCURRENT CURVE VERIFICATION..................6-7

6.2.11 POWER FAIL/RECOVER TEST................................................................ 6-7

6.2.12 HI POTENTIAL TEST................................................................................6-7

7. COMMISSIONING

A. APPENDIX

7.1 SETTINGS TABLE

7.1.1 INSTALLATION INFORMATION.............. ............................ .....................7-1

7.1.2 RELAY SETTINGS.................................................................................... 7-1

A.1 OVERCURRENT PROTECTION SAMPLE CALCULATIONS

A.1.1 CHARACTERISTICS.................................................................................A-1

A.1.2 PHASE TIMED O/C PICKUP.............. ........................... ............................A-1

A.1.3 PHASE INSTANTANEOUS PICKUP.................................................... .....A-1

A.1.4 GROUND PICKUP............... ............... ............... .............. ............... ...........A-1

A.1.5 GROUND INSTANTANEOUS .................... .......................................... .....A-1

A.2 FEEDER DEDICATED TO A TRANSFORMER

A.2.1 CHARACTERISTICS.................................................................................A-2

A.2.2 PHASE TIMED O/C PICKUP.............. ........................... ............................A-2

A.2.3 PHASE INSTANTANEOUS.................. ........................... ............... ...........A-2

A.3 DOs AND DON’Ts

A.3.1 CHECKLIST...............................................................................................A-3

A.4 WARRANTY INFORMATION

A.4.1 WARRANTY ..............................................................................................A-4

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TABLE OF CONTENTS

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2 INSTALLATION 2.1 MECHANICAL

2 INSTALLATION 2.1 MECHANICAL 2.1.1 MOUNTING

The 735/737 is a drawout relay that slides into the panel mounted case. A hinged door covers the front panel controls to allow protected access of the setting selector switches. This allows pickup levels and time delays to be quickly set or modified. The figure b el ow s ho w s the p hys ic al d im ens io ns of the 735/737. A sin gle c uto ut in th e panel, as per the dim en si ons of Figure 2–2: SINGLE AND DOUBLE UNIT PANEL CUTOUTS is required to mount the fixed chassis. When mounting the 735/737, provision shoul d be made for the doo r to open w ithout hitting adjace nt comp onents mount ed on the pane l. For 19inch rack mount applications, a 735/737 can be mounted individually on a panel or side-by-side with another SR series relay (such as the 760) for backup applications. Details are shown below.

Figure 2–1: DIMENSIONS

Figure 2–2: SINGLE AND DOUBLE UNIT PANEL CUTOUTS

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2.1 MECHANICAL 2 INSTALLATION

Remove the relay from the case during mounting (see the following section). Slide the case into the cutout from the front of the panel as shown below. While firmly applying pressure from the front of the chassis to ensure the front bezel fits snugly, bend out the retaining tabs as shown below.

Figure 2–3: SLIDING THE UNIT INTO THE PANEL

Figure 2–4: BEND UP MOUNTING TABS

The retaining tabs will be sufficient to hold the chassis securely in place. If additional fastening is desired the SR optional mounting kit can be ordered. This kit provides additional support with adjustable mounting brackets. The captive chassis should now be securely mounted to the panel with no movement, ready for rear terminal wiring.

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2 INSTALLATION 2.1 MECHANICAL

2.1.2 DRAWOUT RELAY

To remove the relay, open the door by gr asping the right side at the top and pulling until the fri cti on cat ch rele as es . The r e i s a locking catch in the center of the handle. With a screwdriver or your finger placed horizontally in the center, squeeze the catch upwards until the catch disengages, then pull the handle outward so it rotates up, as shown below. Firmly grasp the handle and pull upwards to the vertical endstop until the relay completely disengages.

Press latch and pull to

disengage handle

Figure 2–5: RELAY WITHDRAWAL

To insert the relay, raise the handle to the highest position. Slide the relay into the case until the guide pins engage in the slots on each side. Now press downward on the handle until it clicks and locks in the vertical position. An index pin at the back of the 737 captive chassis prevents the wrong model of relay from being inserted into a non-matching case. This will prevent the relay from being inserted all the way in as a safeguard. Check that the relay model matches the case type before insertion or if excessive force appears to be required.

Rotate handle to vertical stop

position and pull to withdraw

Figure 2–6: RELAY INSERTION

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2.1 MECHANICAL 2 INSTALLATION

2.1.3 PRODUCT IDENTIFICATION

Product attributes will vary according to the configuration and options installed based on the customer order. Before applying power to the relay, remove the relay by pulling up on the handle. Examine the labels on the unit and check that the correct options are installed.

The following section expl ain s the inf orm atio n inc lud ed on t he lab els .

Figure 2–7: 735 LABELS

1. MODEL NO: The model number shows the configuration of the relay including phase CTs, ground CT, power supply voltage and communications.

2. SERIAL NO: This is the serial number of the relay.

3. FILE NO: This number indicates the configuration of the relay. It is important when inserting a relay into a case to ensure that the configur atio n file n umber is th e same for both p ieces . See Sectio n 1.2. 3: REVISION HIST OR Y on page 1–5 for details.

4. MFG DATE: This is the date the relay was produced at the factory.

5. VERSION NO: This indicates the revision of the firmware installed in the relay.

6. CURRENT CTs: This indicates whether the phase CTs installed are 5 A or 1 A.

7. GROUND CT: This indicates whether the ground CT installed is 5 A or 1 A.

8. CONTROL POWER: This indicates the power supply input configuration installed in the relay.

9. TRIP & SERVICE CONT ACTS: T his s ection give s a brie f desc riptio n of the relay contac ts. For a more detail ed des cription, see Section 1.3.3: OUTPUTS on page 1–7.

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2 INSTALLATION 2.2 ELECTRICAL

2.2 ELECTRICAL 2.2.1 WIRING

Different connection schemes are possible depending on the application. Typical connections are shown on the following page where the 735/737 is use d as pri mary p rotecti on. Ens ure that th e wiri ng dia gram nu mber on the drawo ut chas sis l abel matches the number of the instruction manual wiring diagram. Terminals are numbered in rows. Use the labels on the back of the relay to identify terminals with a row letter and position number. Terminal numbers and symbols on the back of the relay should match the wiring diagram in this manual.

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2.2 ELECTRICAL 2 INSTALLATION

Figure 2–8: TYPICAL WIRING DIAGRAM

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2 INSTALLATION 2.2 ELECTRICAL

The following two figures show suggested wiring when the 735/737 is used as backup protection in conjunction with other relays. Select the appropriate scheme depending on whether ground sensing is by the residual method using the phase CTs or by the core balance method using a separate CT.

Figure 2–9: BACKUP WIRING – CORE BALANCE

Figure 2–10: BACKUP WIRING – RESIDUAL

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2.2 ELECTRICAL 2 INSTALLATION

2.2.2 CURRENT TRANSFORMERS

Conventional 1 or 5 A current transformers are used for current sensing. A relaying class CT of the appropriate ratio with enough output to not saturate under short circuit conditions should be selected. For backup protection schemes, these CTs are wired in series with the primary protection relays and test switches, if installed. Typical primary/backup CT wiring is shown in the previous section.

Normally the 735/737 will be connected for residual ground fault sensing as shown in the ALTERNATIVE CT WIRING section of Figure 2–8: TYPICAL WIRING DIAGRAM on page 2–6. When the drawout chassis is removed, the CT secondaries

are automatically connected together by the internal shorting fingers to prevent dangerous high voltages from open CTs. More sensitive grou nd fault de tectio n can be achie ved us ing a core ba lance (zero seq uence ) detecti on metho d as shown in the TYPICAL WIRING DIAGRA M. For thi s configu ration t he th ree phase c ables (plus n eutral i f 4-wire system) p ass th rough the window of a separate CT which senses the zero sequence component of the 3 currents. If a ground shield is present in the 3 phase cable, it must also pass inside the window of the ground fault sensing CT.

2.2.3 OUTPUT RELAYS

Three separate dry c ont act relays are provid ed: TRIP, AUX TRIP and SERVIC E. TRIP an d AUX TRIP are identi ca l non -fai lsafe Form A contacts which both close whenever the relay trips. These contacts remain closed until the current in all three phases and ground drops to zero signifying that the breaker has opened. The contacts remain latched for an additional 100 ms then open. The AUX TRIP relay can be programmed as a trip follower (main trip), as an 86 lockout relay, or as a separate Ground Fault relay. Figure 2–8: TYPICAL WIRING DIAGRAM on page 2–6 shows the relay contact state as untripped with no control power applied. Typically the breaker 52a contact is wired in series with the TRIP relay contact to break the trip coil current. For large trip coils an auxiliary relay may be required.

The SERVICE relay is failsafe; that is, the contacts are normally picked up and drop out whenever the 735/737 detects an internal fault or control power is lost. The se con tacts are Form C. Con tact ratings are show n in Sect ion 1.3.3 : OUTP UTS on page 1–7. Connect the SERVICE relay output to a warning device such as a SCADA monitor.

For more complex control schemes or for status signalling to a SCADA system, the 737 has 8 additional Form C relays. These can be programmed with option switches 6 and 7 to select the operating mode as: energize on trip (pulsed), latched cause of trip, phase/ground pickup or both pickup and cause of trip. See Section 3.4.2: OPTION SWITCHES [14] on page 3–8 for details.

2.2.4 COMMUNICATIONS

Continuous monitoring and control of the 735/737 from a remote computer, SCADA system or PLC is possible using the serial communications port terminals.

Two-wire RS485 is the preferred standard. Four-wire RS422 is also available as an option. RS485 data trans-mission and reception are accomplished on a single twisted pair with transmit and receive data alternating over the same two wires. When the RS422 option is installed, separate twisted pairs are required for transmission and reception. The serial port protocol is a subset of the Modicon Modbus protocol as described in Chapter 4: COMMUNICATIONS.

Lightning strikes and ground surge currents can cause large momentary voltage differences between remote ends of the communication link. For this reason, surge protection devices are internally installed across the relay RS485/RS422 communication port terminals. A separate power supply with an optocoupled data interface is used internally to prevent noise coupling to the circuitry. The source computer/ PLC/SCADA system should have similar transient protection devices installed either internally or externally to ensure maximum reliability under fault conditions. Use shielded, twisted pair connecting wire to minimize communication errors from noise. A suitable type of wire is Belden #9841 which is shielded 24 AWG, stranded twisted pair having a characteristic impedance of 120 Ω. Ground the shield at one point only as shown in the following diagram to prevent ground loops.

Correct polarity is essential. Each relay must be connected with terminal H9 (labelled A+) connected to the same wire and terminal H10 (labelled B–) connected to the other wire. Terminal H8 (labelled shield) should be connected to the ground wire inside the shield. Each relay must be daisy chained to the next one. Avoid star or stub connected configurations. Observing these guidelines will result in a reliable communication system that is immune to system transients.

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2 INSTALLATION 2.2 ELECTRICAL

A maximum of 32 relays can be daisy-chained together on a communication channel without exceeding the driver capability . For l arger sy stems , additi onal se rial ch annels must be added. It i s also p ossib le to use commerc ially availa ble repe aters to increase the number of rel ays on a singl e cha nnel to mo re than 32. Different GE Power Manage ment rel ays may be connected to the same twisted pair link providing they are all programmed with a unique address and the same baud rate.

NOTE

Figure 2–11: RS485 CONNECTION

Figure 2–12: RS485 TERMINATION

Due to address limitations, only 31 735/737s can be put on a single channel. However a different model of GE Power Management relay could be added to the channel increasing the number of relays to 32.

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2.2 ELECTRICAL 2 INSTALLATION

Figure 2–13: 4 CHANNEL, 124 RELAY SYSTEM

If the communications option is used, a disk with the When a PC running thi s prog ram i s c on nec te d to th e 735/737, actual valu es and settings can b e r ead an d p r in ted an d re la y operation can be sim ul ate d for training/testing pu rpo ses . To use this softw are , the co mp ute r RS232 serial port is co nne cte d through an RS232 to RS485 co nverte r as show n below. This can be a commercially availabl e model or the GE Power Management RS232/RS485 converter module. Set the relay front panel communication switches to 9600 baud, address 1, test ON. Apply power to the computer, RS232/ RS485 converter, and relay. Install the setup disk in a personal computer and type "

A:735SETUP

for an explanation of menu items and program operation.

2-10 735/737 Feeder Protection Relay

" ("

A:737SETUP

" for the 737) to run the software. See Section 3.5: SETUP PROGRAM on page 3–11

735SETUP.EXE

software (

737SETUP.EXE

for the 737) is provided.

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2 INSTALLATION 2.2 ELECTRICAL

WARNING

Figure 2–14: RS232/485 CONVERTER

2.2.5 CONTROL POWER

Control power supplied to the 735/737 must match the switching power supply installed or damage to the unit will occur. Consult the order code from the label on the side of the drawout chassis. It will specify the nominal control voltage as:

NOMINAL RANGE

24/48 20 to 60 V DC; 20 to 28 V AC at 50/60 Hz 125/250 90 to 300 V DC; 70 to 265 V AC at 50/60 Hz

Ensure applied the con tro l v oltag e a nd ra ted volta ge on d r awout case terminal label ma tch to pre ven t da mage.

For example, the 125/2 50 pow e r su ppl y wi ll work with any v olta ge from 90 to 3 00V DC or AC voltage from 70 to 265 VAC. The internal fuse may blow if too high a voltage is applied resulting in a completely dead relay. If this occurs the RELAY IN SERVICE indicator will be off and the service output contacts will indicate a relay malfunction. Polarity is not important with DC voltage.

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2.2 ELECTRICAL 2 INSTALLATION

2.2.6 SYSTEM GROUNDING

Two separate grounds are brought ou t t o rear te rmi nal s. Th e sa fety grou nd (te r mi nal G12 ) ma kes a so lid elec tri cal con nec tion to all internal metal chassis parts and causes a fuse to blow should a short develop to the case. It ensures operator safety in the event of a fault. A separate green ground screw is also provided on the back of the chassis for the safety ground.

Surge suppression components are grounded to a separate filter ground (terminal G11). These components are designed to conduct during transients at input terminals to prevent nuisance operation or damage to internal components. For reli-

able operation both g rounds must b e tied di rectly to the gro und bus bar of th e swi tchgea r which i s itse lf conn ected t o a soli d ground. Braided cable or heavy solid copper wire (such as 10 gauge) should be used for optimum transient protection. Do not rely on a ground connection to a part of the metal switchgear enclosure because a low impedance to ground cannot be guaranteed.

2.2.7 HI-POT TESTING

Prior to leaving the factor y, all terminals except filter ground and commu nicat ions are hi-pot (di electri c strength ) tested. If hipot testing is to be performed on an installed relay for insulation verification. The hi-pot potential is applied between the wired together terminals and the enclosure ground according to the figure below. A potential of 2.0 kV is to be applied for 1 minute to test dielectric strength. To effectively clamp transient voltages at a level sufficient to protect the internal circuitry, the internal transient protection devices conduct below the hi-pot voltages used for insulation testing. Consequently, the filter ground terminal G11 must be left floating for this test.

Figure 2–15: HI-POT TESTING CONNECTIONS

Disconnect the communications terminals and filter ground during dielectric strength testing (hipot) or

WARNING

damage to the internal surge protection devices may occur.

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3 SETUP AND OPERATION 3.1 FRONT PANEL

3 SETUP AND OPERATION 3.1 FRONT PANEL 3.1.1 DESCRIPTION

A front panel view of the 735/737 relay is shown below. An explanation of each of the numbered controls/indicators is contained in the following sections.

GE Power Management

735 Feeder Protection Relay

Figure 3–1: FRONT PANEL CONTROLS AND INDICATORS

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3.2 CONTROLS 3 SETUP AND OPERATION

3.2 CONTROLS 3.2.1 PHASE PICKUP [1]

This control determines the pickup current for overcurrent timeout for any phase curve shape and curve multiplier. It is set as a percentage of phase CT rating. Read the pickup current from the inner LO band when the phase CURVE SHAPE is set to a LO range (20 to 100%). Use the outer HI band if the phase CURVE SHAPE is set to a HI range (110 to 220%). Select the OFF position to disable phase time overcurrent.

Figure 3–2: PHASE PICKUP SETTING

3.2.2 PHASE CURVE SHAPE [2]

Five differ ent curve shapes can be selected for the phase time ov ercurrent to provide the requi red coordination. These are definite time, moderately inverse, normal inverse, very inverse and extremely inverse. For each curve, either the LO band or HI band of the phase pickup setting (Control 1) is selected. See the time overcurrent figures for actual curves and curve values in table form.

For example: CURVE SHAPE: normal inverse

PICKUP CURRENT: 480 A PHASE CT RATIO: 600:5 PHASE CURVE SHAPE: normal inverse LO PHASE PICKUP: 80/180 (480 A = 80% of 600 A)

Figure 3–3: PHASE CURVE SHAPE SETTING

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3 SETUP AND OPERATION 3.2 CONTROLS

3.2.3 PHASE TIME MULTIPLIER [3]

The time multipl ier di al a llows selection of a mu lti ple of the base curve shape for ev ery cu rve. It is adjustable from 1 to 1 0 in increments of 1. Unlike the electromechanical time dial equivalent, trip times are directly proportional to the time multiplier setting value. For example, all trip times on multiplier curve 10 are 10 times curve 1. Use the phase time multiplier shift option switches to mov e the se lected curve up or down (s ee Secti on 3.4.2 : OP TION SWITCHE S [14]). C urves a re shown i n Chapter 5 for overlays and visual inspection. Formulas and tabular data are also given for use with computer software or manual plotting on other co-ordination curves.

Figure 3–4: PHASE MULTIPLIER TIME SETTING

3.2.4 PHASE INSTANTANEOUS [4]

Instantaneous phase trip level with no intentional delay (35 ms max) is set with the phase instantaneous dial as a multiple of the CT sensor. This setting is independent of the pickup dial setting.

For example: CT RATING: 500:5

INSTANTANEOUS TRIP: 5000 A INSTANTANEOUS SETTING: 10 (i.e. 10 x 500 = 5000 A)

GE Power Management

Figure 3–5: PHASE INSTANTANEOUS TRIP SETTING

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3.2 CONTROLS 3 SETUP AND OPERATION

3.2.5 GROUND PICKUP [5]

For any ground curve shape and curve multiplier, the pickup current for overcurrent timeout is determined by this control. It is set as a percentage of sensor CT rating which is the phase CTs for residual sensing or the core balance CT for zero sequence sensing. Read the pickup current from the inner LO band when the ground CURVE SHAPE is set to a LO range (15 to 55%). Use the outer HI band if the ground CURVE SHAPE is set to a HI range (60 to 100%). Select OFF to disable ground time overcurrent pickup and trip.

Figure 3–6: GROUND TIME PICKUP SETTING

3.2.6 GROUND CURVE SHAPE [6]

Five differen t c urv e s hap es c an be sel ec ted for the ground time ov erc urre nt t o p r ov ide the re qui red co ordination. These are definite time, moderately inverse, normal inverse, very inverse and extremely inverse. For each curve, either the LO band or HI band of the ground pickup setting is selected. See Chapter 5 for actual curves and curve values in table form.

Figure 3–7: GROUND CURVE SHAPE SETTING

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3 SETUP AND OPERATION 3.2 CONTROLS

3.2.7 GROUND TIME MULTIPLIER [7]

The ground time mu lti pli er sel ec t s a mu lti ple of the base curve sha pe for each curve. It i s adj us tabl e from 1 to 10 in steps of

1. Unlike the electromechanical time dial equivalent, trip times are directly proportional to the time multiplier values. For example, all trip times on multiplier curve 10 are 10 times Curve 1. Curves are shown in Chapter 5 for overlays and visual inspection. Formulas and tabular data are also given for use with computer software or manual plotting on other co-ordination curves. Use the ground time multiplier option switches to move the curve up or down (see Section 3.4: SWITCHES).

Figure 3–8: GROUND TIME MULTIPLIER SETTING

3.2.8 GROUND INSTANTANEOUS [8]

Instantaneous gro und c urren t tri p l ev el with no intentional delay (35 ms m ax .) i s set with the ground instantaneous dial as a multiple of the ground CT senso r. For residually connected phase CT ground sens ing , the setting is a multiple of the phase CTs. This setting is independent of the GROUND PICKUP dial setting ranges from 0.1 to 16 times the ground CT rating.

For example: PHASE CT RATING: 100:5 (residual ground sensing); GROUND FAULT TRIP: 400 A

SETTINGS: Ground Fault Instantaneous = 4 (4 × 100 = 400 A)

GE Power Management

Figure 3–9: GROUND INSTANTANEOUS TRIP SETTING

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3.3 INDICATORS 3 SETUP AND OPERATION

3.3 INDICATORS 3.3.1 STATUS INDICATORS [9]

a) RELAY IN SERVICE

Immediately after applying control power, the 735/737 relay performs a series of self checks. Assuming all checks are successful, the RELAY IN SERVICE indicator comes on and protection is operational. Continuous checks are also made by the relay of its internal circuitry. If an internal failure is detected at any time, the RELAY IN SERVICE light goes out. The SERVICE REQUIRED indic at or and the SERVICE output relays are activated to warn that protection is no t func tio ni ng correctly. This is a serious condition that requires immediate attention since the relay may not respond correctly to a fault. Arrangements should be made to check or replace the relay. During simulation mode, this LED will be flashing.

b) SERVICE REQUIRED

If self checks by the internal microprocessor detect a fault with the relay, this indicator goes on and the SERVICE output relay is activated to warn that protection is n ot fun cti oni ng co rrec tly. Failsafe operation of th e SERVICE output relay by having the coil continuously energized under normal conditions, ensures that a SERVICE output will be obtained on loss of

control power or when the relay is drawn out, even though the SERVICE REQUIRED indicator would be off under those conditions. This is a s eri ous c ond itio n th at re qu ires im m edi ate atte nti on s in ce the rela y m ay no t res po nd c orre ctl y t o a fault. Arrangements should be made to check or replace the relay.

c) PHASE PICKUP

When the current in any phase exceeds the PHASE PICKUP contro l settin g, this indi cator fla sh es . If the conditi on pe rsi sts, the 735/737 will time out and trip with the TRIP 51-A/B/C indicator on.

d) GROUND PICKUP

Flashes when ground (neutral) current from the residual phase CT or separate core balance CT input (depending on ground sensing connection) exceeds the GROUND PICKUP control setting. If the ground overcurrent persists, the 735/737 will time out and trip with the TRIP 51-N indicator on.

3.3.2 TRIP INDICATORS [10]

Fault indicators are provided to determine the cause of trip. Each indicator is latched and remains set after a trip until cleared with the CLEAR key whi le c on trol pow e r is app lie d. Wh en a trip occurs, the TRIP rela y c on tac ts a re c los ed unti l th e three-phase and neutral currents are all zero. The trip output relays seal in for a further 100 ms then open. After the trip relay opens, the trip LED w ill rem ai n o n s tea dy un til res et by pressing the CLEAR key a t whi ch ti me al l th e trip indicators go off. For example, if indicator INSTANTANEOUS-N is on, the last trip was caused by a ground (neutral) instantaneous trip.

Indicators are set for a ll pha ses or ground t hat excee ded the time ove rcu rrent pi ckup o r insta ntaneo us se tting at time o f trip. Thus if indicators INSTANTANEOUS A and C are both on, a phase A to phase C fault occurred. If the breaker is closed after a trip without pressing the CLEAR key, the cause of trip indicator will remain on steady. However, at the next trip, the previous cause of trip indicator will be cleared so that only the most recent cause of trip indicator is on.

Hold the CLEAR key down f or 2 sec onds an d the trip indic ators wil l disp lay in sequen ce the l ast fiv e causes of trips , startin g with the most recent. This trip record is useful for analyzing a recurring fault.

a) PHASE TIME O/C – A, B, C TRIP INDICATORS

If the PHASE PICKUP level is exceeded long enough by any phase current to cause a trip according to the selected phase time overcurrent curve , a tri p oc curs and the corresponding A, B, or C i ndicator will be set to indi ca te a p has e ti me overcurrent trip.

b) PHASE INSTANTANEOUS A, B, C TRIP INDICATORS

When the current in any phase exceeds the PHASE INSTANTANEOUS setting, the relay will trip and the corresponding A, B, or C indicator will be set to indicate a phase instantaneous trip.

c) GROUND TIME O/C TRIP

If the ground (neutral) current exceeds the GROUND PICKUP level long enough to cause a trip according to the se lected ground fault time overcurrent curve this indicator will be set to indicate a ground overcurrent trip.

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3 SETUP AND OPERATION 3.3 INDICATORS

d) GROUND INSTANTANEOUS TRIP

When the ground (neutral) current exceeds the GROUND INSTANTANEOUS setting, the relay will trip and this indicator will be set to indicate ground instantaneous trip.

3.3.3 PHASE CURRENT INDICATOR [12]

Maximum RMS current in any phase as a percentage of CT primary rating for the range 10 to 100% is displayed on this bargraph indicator. If current in all phases is below 10% of CT rating, all segments will be off. For currents above 100% of CT rating all segments will be on. All segments up to the actual current will be on for values between 10 and 100%.

For example: CT RATING: 200:5

PHASE PICKUP: 70% of CT (LO) PHASE CURVE: Normal inverse-LO ACTUAL CURRENT: 165 A DISPLAY: 165/200 = 83%

10% - 80% on

83% > 70% pickup so PHASE PICKUP indicator is flashing

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3.4 SWITCHES 3 SETUP AND OPERATION

3.4 SWITCHES 3.4.1 COMMUNICATION [11]

Switches are used to s et the co mmun icatio n param eters. Mov e the sw itc h to the rig ht for a 1 or ON. To use the communications capability of the 735 /737, a un ique ad dress must be chosen and the baud rate m ust ma tch the s ystem se lecte d. A vai lable baud rates of 1200, 2400, 9600, and 19200 are selected using switches 1 and 2 as follows: (ON = switch to right).

SWITCH 2 SWITCH 1 BAUD RATE

OFF OFF 1200 baud OFF ON 2400 baud ON OFF 9600 baud ON ON 19200 baud

Chapter 4: COMMUNIC ATIONS describes the required data fram e an d me ss ag e structure. Up to 31 relays (sl ave s) c an be

connected on a twisted pai r communi cation s link to a single ma st er. Each relay must have a unique address from 1 to 31 or address conflicts will occur. Address 0 is reserved for broadcast mode and should not be used.

To select a given address, set switches 3 to 7 so the indicated numbers add up to the correct address. For example, address 14 = 2 (4 on) + 4 (5 on) + 8 (6 on), with remaining switches 3 (=0) and 7 (=0) off. When switch 8 "TEST" is on, the 735/737 will accept communication commands to simulate different dial settings with computer controlled phase and ground currents for testing and training purposes. Protection is disabled in the test position once simulation commands are received from the communication port. Set this switch OFF to disable simulation during normal operation.

3.4.2 OPTION SWITCHES [14]

The option switches are selected according to the following table:

T ab le 3–1: OPT IO N SWITCHES

SWITCHES FUNCTION

1 2 3 4 5 6 7 8

PHASE TIME OVERCURRENT SHIFT

OFF OFF --- --- --- --- --- --- phase time overcurrent shift x 1.0

ON OFF --- --- --- --- --- --- phase time overcurrent shift x 0.5

OFF ON --- --- --- --- --- --- phase time overcurrent shift x 0.8

ON ON --- --- --- --- --- --- phase time overcurrent shift x 1.1

GROUND TIME OVERCURRENT SHIFT

--- --- OFF OFF --- --- --- --- ground time overcurrent shift x 1.0

--- --- ON OFF --- --- --- --- ground time overcurrent shift x 0.5

--- --- OFF ON --- --- --- --- ground time overcurrent shift x 0.8

--- --- ON ON --- --- --- --- ground time overcurrent shift x 1.1

SYSTEM FREQUENCY

--- --- --- --- OFF --- --- --- frequency: 60 Hz

--- --- --- --- ON --- --- --- f requency : 50 Hz

PICKUP/TRIP RELAYS – 737 ONLY

--- --- --- --- --- OFF OFF --- pulsed trip only

--- --- --- --- --- OFF ON --- latched cause of trip only

--- --- --- --- --- ON OFF --- pickup only

--- --- --- --- --- ON ON --- pickup & latched cause of trip

CUSTOM SCHEME

--- --- --- --- --- --- --- OFF standard factory defaults

--- --- --- --- --- --- --- ON programmed option settings

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3 SETUP AND OPERATION 3.4 SWITCHES

a) PHASE TIME MULTIPLIER SHIFT

Although only 10 di sc rete c urv es c an b e selected for phase ti me overcurrent usi ng the time multipli er dia l, the trip times ca n be shifted to effectively create additional curves. This allows for more accurate coordination. To change the curve shift value, the relay must be drawn out from the captive chassis and the option switches on the side of the relay set according to the table above.

Use the following procedure to select the correct shift value:

1. Plot the required curve for coordination.

2. Select the closest curve shape

3. Select the appropriate Time Multiplier and Phase Shift overcurrent combination to match the required curve trip times

(refer to the examples below for details).

EXAMPLE 1:

The plotted curves falls on normally inverse curve number 4. In this case, select:

CURVE SHAPE: Normal Inverse TIME MULTIPLIER: 4

and set the OPTION SWITCHES for a phase overcurrent shift of 1 (switches 1 and 2 both OFF).

EXAMPLE 2:

The plotted curve is approximately halfway in-between Very Inverse curves 5 and 6. In this case, select values for Phase Time O/C Shift and Time Multiplier that most closely match the required curve so that:

Time Multiplier x Phase Shift = 5.5

To meet this requirement, set Time Multiplier = 7 and Phase Time O/C Shift = 0.8. The selected curve will have an approximate time multiplier of 7 × 0.8 = 5.6. Select:

CURVE SHAPE: Very Inverse TIME MULTIPLIER: 7

and set the option switches for a phase overcurrent shift of 0.8 (switch 1 OFF and switch 2 ON).

b) GROUND MULTIPLIER SHIFT

Ground time multiplier shift works exactly the same way as the phase shift time multiplier except that it affects the selected ground curve.

c) FREQUENCY

Nominal system frequency should be set to determine the sample rate for optimum current measurement.

d) PICKUP/CAUSE OF TRIP RELAYS (737 ONLY)

The 737 has 8 additional output relays fir more complex control schemes or for status signalling to a SCADA system. These are programmed with option switches 6 and 7 to energize on:

1. PULSED TRIP ONLY: In addition to the two form A common trip output contacts, a separate contact for each protec-

tion element will also ac tivate . This ma kes the 737 the eq uival ent of 8 separa te protec tion rel ays for i nterfac ing to mo re complex protective relaying schemes. Relay output contacts for the 50/51 protection element that is causing the trip operate in the same manner as the common trip output contacts.

2. LATCHED CAUSE OF TRIP ONLY: After a trip, the rel ay(s) c orresp onding to the 50/51 element that ca used the trip will

be latched until the front panel CLEAR key is pressed or a "reset cause of trip" command is received through the communications port. The ou tput rela ys en ergized will be the same as the TR IP in dic at ors on th e front panel. This is us efu l for interface to a SCADA system to diagnose the cause of trip.

3. PICKUP ONLY: Output relays activate when any phase/ground current is above the pickup setting. Relays automati-

cally reset if the ground/phase current drops below the pickup level. This is useful for interface to a SCADA system to warn of faults which could lead to a trip if not corrected.

4. PICKUP OR CAUSE OF TRIP: Either pi ck up or la tch ed cause of trip will en ergi ze the relays. This is th e s am e as items

2 and 3 together.

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3.4 SWITCHES 3 SETUP AND OPERATION

e) CUSTOM SCHEME

In addition to basic protection, the 735/737 can be field configured to perform more complex protection logic using an internal non volatile setpoint memory. When "custom scheme" switch 8 on the side of the drawout relay is set to off, all custom scheme features are defeated so that the fac tory default shown for eac h option is active. Us e th e sw it ch 8 off setting unl es s any of the special options listed here are required. With switch 8 set on, the internal setpoint memory settings described here are active. These c an be factory preset at cus tom er re que st o r changed in the field usin g th e ning on a computer connected to the serial port.

If switch 8 is set on, use the

Communicate > Setpoints > Custom Scheme

entries from the

CUSTOM SCHEME: Factory Default: DISABLED (switch 8 off)

This is a status indication only of the custom scheme enable switch #8 on the side of the drawout relay. It will read: DISABLED if switch 8 is off and ENABLED if switch 8 is on.

TIME OVERCURRENT CURVE SHAPE: Factory Default: ANSI

Selection of ANSI, IAC or IEC/BS142 time overcurrent curve shapes is specified with this setpoint. Consult the appropriate curve in Chapter 5 to determine trip times for the selected curve. Depending on the setting, phase and ground curve shape dials will be defined as:

ANSI IAC IEC/BS142

Moderately Inverse Short Time Short Time Normal Inverse Inverse IEC A Very Inverse Very In verse IEC B Extremely In verse Extre me l y In verse IEC C Definite Time Definite Time Definite Time

735SETUP

program screen is as follows:

735SETUP

menu and modifying the settings as required. Interpretation of the

program to view settings by selecting the

735SETUP

program run-

BLOCK INSTANTANEOUS ON AUTORECLOSE: Factory Default: Disabled

When the 735/737 is us ed in con ju nction with an autoreclos e s c hem e, i t m ay be d es ira ble to b loc k ins tantaneous trips after an autoreclosure operation. This prevents nuisance trips due to the normally high inrush currents typically experienced in these situations and allows a coordinated clearance of permanent faults by fuses or inverse-time overcurrent relays. A programmable phase an d ground instan taneou s trip blo ck time from 0 to 180 se co nds can be pr ogra mmed wi th this s etpoin t. If this setpoint is enabled, when the 735/737 first detects current in any phase, it disables phase and ground instantaneous trips for the duration of this time setting. Time overcurrent protection however is enabled during this time.

AUX TRIP RELAY: Factory Default: MAIN TRIP (AUX relay follows TRIP relay)

The Auxiliary relay can be set to MAIN TRIP, 86 LOCKOUT, or GROUND TRIP.

• If MAIN TRIP is enabled the AUX relay follows the TRIP relay.

• If 86 LOCKOUT is ena bled th e AUX relay with output contac ts co nnecte d to term inal s G6 and H 6 is programm ed to ac t as an 86 Lockout relay. When untripped, the contacts are normally closed enabling the breaker close coil circuit. (If control power to the relay is not present, this contact opens effectively creating a lockout condition.) When a trip occurs, the trip contacts (G5/H5) will momentarily pulse to trip the breaker while the 86 Lockout contacts (G6/H6) will latch open preventing the close coil contacts from being activated. To restore the 86 Lockout contacts to the normally closed condition, ei the r the front panel CLEAR key must be pressed to clear the trip c ond iti on an d indicators, or a “T ri p Reset” command must be received via the communications serial port. If the 86 Lockout relay is not reset and control power is lost, the 86 Lockout contacts will remain in the lockout condition after power is restored.

• If GROUND TRIP is enabled the AUX relay will respo nd only to TIMED or INSTANTANEOUS Grou nd Faults . Phase O/ C Trips will only trip the TRIP relay. Ground Fault Trips will only trip the AUX relay.

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3 SETUP AND OPERATION 3.5 SETUP PROGRAM

3.5 SETUP PROGRAM 3.5.1 DESCRIPTION

The

735SETUP

operation of the relay from a computer running MS-DOS. See Section 2.2.4: COMMUNICATIONS on page 2–8 for installation procedures. Whe n the rela y i s pro pe rly c on nec ted for c om mu nications, put the setup disk in the c urre nt dri ve and typ e: "

735SETUP

Menus are used to sel ect the des ired op eration . Use a m ouse or the a rrow key s to sel ect the desire d menu item. Comman d choices appear on the left side of the screen. Communication status and COM port in use are shown on the bottom of the screen. In the upper right area of the screen the software revision will be displayed. Screen information can be printed on the computer printe r by pres si ng the F2 key when the d es ired sc ree n is bei ng dis pl ayed. This is useful for obta ini ng a ha rdcopy of simulations for later reference.

The menus outlined below are used to establish communication with the relay, read/save setpoints to a computer file, configure computer settings and provide product information.

program can be run for train ing /te sti ng pu rpo ses to rea d rel ay actu al values , pri nt ou t set ting s an d si mu late

" ("

737SETUP

" for 737 unit).

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Figure 3–10: SETUP SOFTWARE SYSTEM MENUS

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3.5 SETUP PROGRAM 3 SETUP AND OPERATION

3.5.2 COMMUNICATE

Select Communica te t o e sta bli sh communication with th e c on nec ted rel ay. Set the front panel COMMUN ICATION switches to 9600 baud, ad dres s 1, test = ON, then apply power to t he relay. When succes s ful c om mu nic ati on s is e st abl is hed , a m es sage will be displayed near the bottom of the screen. If the message indicates unsuccessful communications, check communication switch s et t ing s and wiri ng connections between th e re lay, computer and RS232/485 co nv erte r. Also ensure that the correct comput er COM po rt is be ing us ed. Wh en com muni cation s is establ ished , the s creen d ispla ys m enus wi th Statu s selected.

3.5.3 SETPOINTS EDITOR

SETPOINTS EDITOR > FILE > OPEN:

Retrieve a setpoint file from the disk. All relay values, with the exception of actual dial settings, can be modified and saved back to disk either as the same file or as a new one. This is useful for creating different relay setups.

Starting from version D1.3, a File List Window will pop up to select a setpoint file. The File List window displays file names in the current directory, the parent directory, and all subdirectories. You can enter a file name explicitly or enter a file name with standard DOS wildcards (*and?) to filter the names appearing in the window. You can use arrows to select a file name, and then press Enter to open it. You can also double click your left mouse button to open any file displayed in the window.

SETPOINTS EDITOR > FILE > NEW:

Loads factory default settings into the computer memory. These can be used as a starting point for making new relay setups.

SETPOINTS EDITOR > FILE > SAVE:

Saves the settings in the computer memory to the file on the currently selected disk which was originally loaded. The original file is overwritten.

SETPOINTS EDITOR > FILE > SAVE AS:

Saves the settings in the computer memory to a new file. A File List window, identical to the one in

Setpoints > File > Open

SETPOINTS EDITOR > FILE > PRINT:

Print all the settings in the computer memory to obtain a hard copy. A File List window identical to the one in

Setpoints > File > Open

SETPOINTS EDITOR > FILE > COMMENT:

User comments typed with this menu selection will be added to the saved file and printed out on a hardcopy. This is useful for documenting relay types and comments for a specific application.

SETPOINTS EDITOR > SETPOINTS > SIMULATED DIALS:

To create a relay simulation setup using simulated protection settings from the computer instead of the relay dials themselves enter the required settings with this menu. After saving entered values different simulation setups can be recalled later with

SEPOINTS EDITOR > SETPOINTS > SIMULATED CURRENTS:

Required currents for a specific test are entered using this menu. When used in conjunction with the simulated dials menu, a complete test setup can be created. Once the required setup has been entered in the computer memory, use

Setpoints > File > Save As

RETURN:

When using a mouse, click on this menu to move cursor up to the next higher menu level. This selection is the same as pressing the ESCAPE key.

Setpoints > File > Open

, will pop up to enter a new file name to be saved to the disk.

will pop up to select the file to print.

menu to save having to re-enter different test settings.

to save to a file for later recall and downloading to the relay being tested.

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3 SETUP AND OPERATION 3.5 SETUP PROGRAM

3.5.4 SYSTEM CONFIGURATION

SYSTEM CONFIGURATION > PORT:

Enter the computer COM port that is being used for communication to the relay. Usually this will be COM1:

SYSTEM CONFIGURATION > DISPLAY:

Color, monochrome, and black and white displays are supported by the best matches the computer system used.

INFO:

Product features are displayed in this screen for reference. No operation is performed when this menu item is selected.

QUIT:

Exit the

Once communication with the relay is established menus are used for direct communication with the relay to read actual values, read setti ngs and si mu late rel ay opera tion. W hen screen value s are ch anged, the mod ified d ata is s ent im media tely to the connected relay. These menu items are shown and described below.

735SETUP

program back to DOS

735SETUP

program. Select the display type that

3.5.5 ST ATUS

Figure 3–11: SETUP SOFTWARE RELAY COMMUNICATION MENUS

The computer screen is a mimic of the relay front panel indicators. It shows status, pickup, cause of trip indicators and the current bargraph. The computer screen information is constantly updated to agree with the relay front panel indications.

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3.5 SETUP PROGRAM 3 SETUP AND OPERATION

3.5.6 ACTUAL VALUES

ACTUAL VALUES > METERED DA TA:

Actual phase A B C and ground current being measured by the relay are displayed. If the relay is in simulation mode, the displayed current will be the programmed simulation cu rrent.

ACTUAL VALUES> PRE-TRIP DAT A:

After the relay trips, all currents and cause of trip are saved by the relay. This screen shows the information present at time of trip and the cause of trip. Normally this pre-trip information is used when the relay is connected in a communication network to diagnose the fault that caused the trip. When used with the ate and appear under simulated fault conditions which is useful for training and product understanding.

ACTUAL VALUES> RELAY SETTINGS:

Actual dial and option switch setting s on the rel ay are displayed on t he sc ree n. T his i s us eful fo r v erif ic ati on prior to installa-

tion that intended settings have in fa ct been se t correct ly. Use the displayed settings to a file for future reference.

SETPOINTS > SIMULATED DIALS:

When doing simulatio ns, pro tectio n setti ngs ca n be eit her the ac tual re lay di als on the fr ont pan el or sim ulate d setti ngs from the computer. If simulated settings are to be used, enter them using this menu selection.

SETPOINTS > /SIMULATED CURRENTS:

If a current injection set is availa ble, ac tual curr ents ca n be injec ted int o the relay via its rear termin als for te sting. Fault sim ulations can also be simulated using only a computer by entering required currents with this menu.

SETPOINTS > CUSTOM SCHEME:

Custom scheme setpoints can be selected on the screen. This allows the relay to be configured using one of three curve types, Aux relay assignment and block instantaneous. Switch 8 on the side of the relay must be ON for the setpoints to be used.

735SETUP

File > Relay To File

program it confirms how the relay will oper-

menu selection to save these

3.5.7 SETPOINTS

3.5.8 COMMANDS

COMMANDS > RESET:

Clear the trip target indicators on the front of the relay if any are set by executing this command. It has the same effect as pressing the CLEAR key on the front of the relay.

COMMANDS > CLEAR TRIP RECORD:

Clear the trip record stored in the pre-trip data page of the relay to none.

COMMANDS > ENABLE TRIP RELAYS:

Whenever the relay trips during testing the output trip relays will activate. This is the normal default when TEST switch 8 is first turned on. Use this mode for activating a test set timer to verify actual operation of the relay.

COMMANDS > /DISABLE TRIP RELAYS:

If testing is to be done in a si tuatio n where the trip rela y output s woul d shut do wn equ ipment, the trip relay s can be di sable d to prevent this. Select this mode of operation before injecting currents or issuing the "Simulate Currents" command. If the output relays are disabled, no protection is provided to the switchgear. Returning the TEST switch 8 to the off position after issuing this command re-enables all trip relays and full protection is restored.

COMMANDS > /USE DIAL SETTINGS:

Select this item if the desired protection settings for the simulation are to be from the relay front panel dials. The relay front panel TEST switch 8 must be on for simulation mode to work.

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3 SETUP AND OPERATION 3.5 SETUP PROGRAM

COMMANDS > /USE CURRENT INPUTS:

The relay will use actual currents from its rear terminal inputs for all readings. A current injection set would need to be connected to the relay du rin g s im ula tio n to us e th is mo de. The relay front panel TEST swit ch 8 must be on for simul ati on m od e to work.

COMMANDS > SIMULATE DIALS:

Protection settings can be generated from the computer instead of the actual dials on the front of the relay. Use this menu to simulate dial settings from the computer and see the effect that changes make during simulation. Enter the desired settings with the must be on for simulation mode to work.

COMMANDS > SIMULATE CURRENTS:

Once desired current values for a fault simulation have been entered into the computer using the

Setpoints > Simulated Currents

tection timeout begins as soon as the relay receives the command over the serial communications link. After a trip, the relay will return to must be executed for each new trip simulation. The relay front panel TEST switch 8 must be on for simulation mode to work.

FILE > FILE TO RELAY:

Transfer all settings except the actual relay settings from a file on the disk in the default directory to the relay connected to the computer. Previously saved simulation setups can be automatically loaded this way.

FILE > RELAY TO FILE:

Transfer al l setti ngs in th e relay connec ted to th e comp uter to a fil e on the d isk in the de fault dri ve. Whe n used wi th the pri nt command in in the field.

FILE > PRINT LAST TRIP:

Print a hard copy of relay settings and pre-trip data to the printer. If the relay is in dial simulation mode, the simulation settings are printed, ot herwise the real relay s etting s are pri nted. Th is fea ture is u seful to keep a hard c opy of the las t fault simulation.

Setpoints > Simulated Dials

menu, make the relay see these currents by executing this menu selection. Pro-

Command > Use Current Inputs

Setpoints Editor > File

menu before executing this command. Relay front panel TEST switch 8

mode and the

, this is useful for maki ng ha rdc opy rec ord s of re lay se ttin gs prio r to installation

Command > Simulate Currents

command

3.5.9 FILE

3.5.10 INFO

Product features are displayed in this screen for reference. No operation is performed when this menu item is selected.

3.5.11 RETURN

When using a mouse, click on this menu to move cursor up to the next higher menu level. This selection is the same as pressing the ESCAPE key.

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3.6 SETUP EXAMPLE 3 SETUP AND OPERATION

3.6 SETUP EXAMPLE 3.6.1 EXAMPLE REQUIREMENTS AND SETTINGS

Refer to Section 3.2: CONTROLS for the corresponding dial settings.

CT s: 600 :5

The primary CT current rating (600 A) affects phase and ground pickup and instantaneous dials since these are a percentage of CT sensor. Check label on side of drawout chassis to ensure the relay is configured for 5A CTs.

Phase Time Overcurrent Pickup: 360 A

Setting

----------------------------- -

CT Primary

Set the PHASE PICKUP dial to 60%. Note this is the LO band used in setting the PHASE CURRENT SHAPE dial.

Phase Current Shape: Normal Inverse

Set PHASE CURVE SHAPE to Normal Inverse-LO to match the PHASE PICKUP dial setting on LO band (60% of sensor)

Phase Time Multiplier: 1 second at 4 × PU

From system co-ordination curves, choose the closest matching curve by overlaying the required curve shape with the curve figures or readin g off a trip time point f or a g iv en s ha pe. Ass um ing an ANSI Normal Inverse curve with a trip time of 1 second at 4 × PU, this is curve multiplier 2. Set the PHASE TIME MULTIPLIER to 2. Set phase o/c curve shift to 1 (option switches 2=OF F 1=OFF).

Phase Instantaneous: 6000 A

Setting

-----------------------

CT Ratio

Set the PHASE INSTANTANEOUS to 10 (× CT). This setting is independent of the PHASE PICKUP setting used for time overcurrent trips.

Ground Sensing: Residual

Wire the ground current input using the phase CTs connected for residual sensing. Use the phase CT primary as the ground CT value in setting pickup and instantaneous ground settings.

Ground Fault Trip Level: 240 A

Ground current sensing is by residual connection of the phase CTs. If a separate ground CT is used for ground fault detection, use the primary value for the CT in calculating the GROUND PICKUP dial setting.

360

--------- - 60%== 600

6000

------------- 10 CT×== 600

Pickup Setting

--------------------------------------

Sensor CT

The GROUND PICKUP dial is set to 40 (% of CT) which falls on the LO band. Consequently, the selected ground curve shape must be on the LO band setting.

Ground Time Multiplier: 200 ms delay definite time

A fixed delay of 200 ms afte r gro und fau lt de tec tion is required for co-ord ina tio n s o se t th e cu rve shape to DEFINITE TIMELO. From the definite time curves to get a 200 ms delay, curve 2 is required with a ground time o/c shift of 1. Set GROUND TIME MULTIPLIER to 2. Set ground time o/c shift option switches 4=OFF, 3=OFF.

Ground Instantaneous Trip: None

Only the 200 ms delayed pickup of 240 A is required so set the GROUND INSTANTANEOUS dial to OFF.

3-16 735/737 Feeder Protection Relay

240

--------- - 40% of CT== 600

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3 SETUP AND OPERATION 3.6 SETUP EXAMPLE

Slave address: 10 Baud rate: 9600

For a baud rate of 9600, 2=on, 1=off. Choose the combination of numbers that adds up to the required slave address: 10 = 2 (4=on) + 8 (6=on), (3=off, 5=off, 7=off). Disable communications test mode for normal operations (Test 8=off). The switch settings are:

SWITCH POSITION SETTING

1 OFF 9600 baud 2ON 3 OFF Address 10 4ON 5OFF 6ON 7OFF 8 OFF Test OFF

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3.6 SETUP EXAMPLE 3 SETUP AND OPERATION

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4 MODBUS COMMUNICATIONS 4.1 OVERVIEW

4 MODBUS COMMUNICATIONS 4.1 OVERVIEW 4.1.1 DESCRIPTION

Communication with an external computer/PLC/SCADA system is useful for continuous status monitoring and for testing. Two wire RS485 or four wire RS422 communication interfaces are available; RS485 being the preferred type, with RS422 available as an option.

The 735/737 implements a subset of the AEG Modicon Modbus serial communication standard. Modbus protocol is hardware independent . The 735 /73 7 s upp orts R S485 an d R S42 2 hardware configuratio ns. Mo dbu s is a single master / m ult ipl e slave type of protocol su itable for a multi -drop co nfigura tio n as prov ided by RS4 85 hardw are. Usi ng RS4 85, up to 32 slaves can be daisy-chain ed to get her on a sin gle com m uni ca tion channel. Due to addres s li mi tati ons onl y 31 735/737s can be put on a single channel. However, another model of relay could be added, increasing the number to 32.

735/737 relays are always Modbus slaves. They can not be programmed as Modbus masters. Computers, PLCs or SCADA system s are commonly programmed as masters. Modb us protocol ex ists in two ve rsions: Remo te Terminal Unit (RTU, binary) and ASCII. Only the RTU version is supported by the 735/737. Both monitoring and control are possible using read and write register commands. Commands are supported to provide additional functions.

4.1.2 ELECTRICAL INTERFACE

The 735/737 Modbus im pleme ntatio n employs two-wi re RS48 5 hardware (4 wire RS422 is a lso avail able). D ata fl ow is bid irectional, referred to as half duplex. That is, data is never transmitted and received at the same time. For RS485 electrical interface, receive and transmit data alternate over the same 2 wires.

RS485 lines should be connected in a daisy chain configuration with terminating resistors installed at each end of the link (that is, at the master end and at the slave farthest from the master). The value of the terminating resistors should be approximately equal to the characteristic impedance of the line. A recommended wire type is Belden #9841, 24 AWG stranded, shielded twisted pair. This wire has a characteristic impedance of 120 Ω, thus requ iri ng 12 0 Ω terminatin g res is- tors. It is als o recommende d that a 1 n F / 5 0 V bidire ctional cap acitor be put in series with t he terminati ng resistor s thus ensuring that the I/O terminals are biased correctly. Shielded wire should always be used to minimize noise. Polarity is important in RS485 communications. The '+' terminals of every device must be connected together. See Section 2.2.4: COMMUNICATIONS on page 2–8 for further wiring details.

4.1.3 DATA FRAME FORMAT AND RATE

One data frame of an asynchronous transmission to or from a 735/737 consists of 1 start bit, 8 data bits, and 1 stop bit to produce a 10 bit data fr ame . Thi s is im po rtan t for transmission throug h mo dem s at hi gh b it rat es (11 bit data frames are not supported by some modems at bit rates of greater than 300 bps). Although Modbus protocol can be implemented at any standard communic at ion s pee d, the 735/737 suppo rts op era t ion a t 1 200 , 2400, 9600 and 19 200 ba ud by front panel s w itch selection.

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4.1 OVERVIEW 4 MODBUS COMMUNICATIONS

4.1.4 DATA PACKET FORMAT

A complete request/response sequence consists of the following bytes transmitted as separate data frames:

Master Request Transmission:

SLAVE ADDRESS: 1 byte FUNCTION CODE: 1 byte DATA: variable number of bytes depending on FUNCTION CODE CRC: 2 bytes

Slave Response Transmission:

SLAVE ADDRESS: 1 byte FUNCTION CODE: 1 byte DATA: variable number of bytes depending on FUNCTION CODE CRC: 2 bytes

a) SLAVE ADDRESS:

This is the first byte of eve ry tr ansmi ssion. It is the user-as sign ed addre ss of the sl ave de vice that is to re ceive th e mess ag e sent by the master. Each slave device must be assigned a unique address using the front panel switches and only the addressed slave will respond to a transmission that starts with its address.

In a master request transmission the SLAVE ADDRESS represents the address of the slave to which the request is being sent. In a slave response transmission the SLAVE ADDRESS represents the address of the slave that is sending the response. A master transmission with a SLAVE ADDRESS of 0 indicates a broadcast command. All slaves on the communication link will take action based on the transmission but no response will be made.

b) FUNCTION CODE

This is the second byte of every transmission. Modbus defines function codes of 1 to 127. The 735/737 implements some of these functions. See section 4.3 for details of the supported function codes. In a master request transmission the FUNCTION CODE tells the slave what action to perform. In a slave response transmission if the FUNCTION CODE sent from the slave is the same as the FUNCTION CODE sent from the master then the slave performed the function as requeste d. If the high order bit of the FUNCTION CODE sent from the slave is a 1 (tha t is, if the FUNCTION CODE > 127) then the slave did not perform the function as requested and is sending an error or exception response.

c) DATA

This will be a variable number of bytes depending on the FUNCTION CODE. Data may be actual values, setpoints, or addresses sent by the master to the slave or by the slave to the master. See Section 4.2: SUPPORTED MODBUS FUNCTIONS on page 4–4 for a description of the supported functions and the data required for each.

d) CRC

This is a two byte error checking code (see the following section for additional details).

4.1.5 TIMING

Data packet synchronization is maintained by timing constraints. The receiving device must measure the time between the reception of characters. If three and one half character times elapse without receiving a new character or completion of the message, then the communication link must be reset (that is, all slaves start listening for a new transmission from the master). Thus at 9600 baud a delay of greater than 3.5 × 1 / 9600 × 10 = 3.6 ms will cause the communication link to be reset.

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4 MODBUS COMMUNICATIONS 4.1 OVERVIEW

4.1.6 ERROR CHECKING

The RTU version of Modbus includes a two byte CRC-16 (16 bit cyclic redundancy check) with every transmission. The CRC-16 algorithm essentially treats the entire data stream (data bits only; start, stop and parity ignored) as one continuous binary number. This number is first shifted left 16 bits and then divided by a characteristic polynomial (11000000000000101B). The 16 bit remainder of the division is appended to the end of the transmission, most significant byte first. The resulting message including CRC, when divided by the same polynomial at the receiver will give a zero remainder if no transmission errors have occurred.

If a 735/737 Modbus slave device receives a transmission in which an error is indicated b y the CRC-16 calculation, the slave device will not respond to the transmission. A CRC-16 error indicates than one or more bytes of the transmission were received incorrectly and thus the entire transmission should be ignored in order to avoid the slave device performing any incorrect operation. The CRC-16 calculation is an industry standard method used for error detection. An algorithm is included here to assist programmers in situations where no standard CRC-16 calculation routines are available.

CRC-16 Algorithm:

Once the algorithm is complete, the working registe r "A" will contain th e CRC value to be transmitted. No te that this algorithm requires the characteristic polynomial to be reverse bit ordered. The most significant bit of the characteristic polynomial is dropped since it does not affect the value of the remainder. The following symbols are used in the algorithm:

--> data transfer A 16 bit working register AL low order byte of A AH high order by te of A CRC 16 bit CRC-16 value i, j loop counters (+) logical exclusive or operator Di ith data byte (i = 0 to N-1) G 16 bit characteristic polynomial = 1010000000000001 with the MSbit dropped and bit order reversed shr(x) shift right (the LSbit of the low order byte of x shifts into a carry flag, a '0' is shifted into the MSbit of the high order

byte of x, all other bits shift right one location)

The algorithm is:

1. FFFF hex --> A

2. 0 --> i

3. 0 --> j

4. Di (+) AL --> AL

5. j+1 --> j

6. shr(A)

7. is there a carry? No: go to 8. Yes: G (+) A --> A

8. is j = 8? No: go to 5.

Yes: go to 9.

9. i+1 --> i

10. is i = N? No: go to 3.

Yes: go to 11.

11. A --> CRC

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4.2 SUPPORTED MODBUS FUNCTIONS 4.2.1 DESCRIPTION

The following functions are supported by the 735/737:

• 03: Read Setpoints

• 04:Read Actual Values

• 05: Execute Operation

• 06: Store Single Setpoint (test/simulation)

• 07: Read Device Status

• 16: Store Multiple Setpoints (test/simulation)

4.2.2 FUNCTION CODE 03: READ SETPOINTS

Modbus implementation: Read Holding Registers 735/737 implementation: Read Set points

For the Modbus implementation, "holding registers" are equivalent to memory locations reflecting the user switch settings. Holding registers are 1 6-bi t (t w o b yte ) val ues tra ns mi tted h igh ord er by te firs t. T hus a ll s etpo int s are se nt as two bytes. Thi s function code allows the master to read setpoints from a slave device.

The slave response i s the s lave a ddress , func tion c ode, a c ount of the num ber of da ta byte s to fo llow, the data itself and the CRC. Each data item (setpoint) is sent as a two byte number with the high order byte sent first. Note that bro adcast mode is not allowed with this function. The master transmission will be ignored by all slaves if broadcast mode is used with this function code.

Message Format and Example:

Request slave 11 to respond with 3 setpoints starting at address 0040. For this example the setpoint data is:

ADDRESS DATA

0040 0003 0041 0000 0042 0009

MASTER TRANSMISSION: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 11 message for slave 11 FUNCTION CODE 1 03 read setpoints START ADDRESS 2 00 40 data starts at 0040h NUMBER OF SETPOINTS 2 00 06 3 setpoints = 6 bytes CRC 2 ?? ?? CRC calculated by the master

SLAVE RESPONSE: BYTES EXAMPLE / DESC R I PT IO N

SLAVE ADDRESS 1 11 response message from slave 11 FUNCTION CODE 1 03 read setpoints BYTE COUNT 1 06 3 setpoints = 6 bytes DATA #1 2 00 03 setpoints data at 0040h DATA #2 2 00 00 setpoints data at 0041h DATA #3 2 00 09 setpoints data at 0042h CRC 2 ?? ?? CRC calculated by the slave

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4.2.3 FUNCTION CODE 04: READ ACTUAL VALUES

Modbus Implementation: Read Input Registers 735/737 Implementation: Read Actual Values

For the Modbus implementation, "input registers" are equivalent to 735/737 actual values. Input registers are 16 bit (two byte) values transmitted high order byte first. Thus all 735/737 actual values are sent as two bytes. This command allows the master to read a group o f actual values from a slave devic e. The maximum number of ac tua l va lues that can be read in one transmission is 60 in the 735/73 7. The sla ve resp onse to thi s funct ion code is th e slave address, fun ction co de, a cou nt of the number of data bytes to follow, the data itself, and the CRC. Each data item (actual value) is sent as a two byte number with the high order byte sent first.

The broadcast mode is not allowed with this function code. The master transmission will be ignored by all slaves if broadcast mode is used with this function code.

Message Format and Example:

Request slave 11 to respond with 1 actual value starting at address 0008. For this example the actual value in this address (0008) is 01AE.

MASTER TRANSMISSION: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 11 message for slave 11 FUNCTION CODE 1 04 read actual values DATA STARTING ADDRESS 2 00 08 data starts at 0008h NUMBER OF ACTUAL VALUES 2 00 01 1 actual value = 2 bytes CRC 2 ?? ?? CRC calculated by the master

SLAVE RESPONSE: BYTES EXAMPLE / DESC R I PT IO N

SLAVE ADDRESS 1 11 response message from slave 11 FUNCTION CODE 1 04 read actual values BYTE COUNT 1 06 1 actual value = 2 bytes DATA 2 01 A3 data at 0008h CRC 2 ?? ?? CRC calculated by the slave

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4.2.4 FUNCTION CODE 05: EXECUTE OPERATION

Modbus Implementation: Force Single Coil 735/737 Implementation: Execute Operation

This function code allows the master to request the 735/737 to perform specific operations. The operations that can be performed by the 735/737 are as follows:

OPCODE FUNCTION DESCRIPTION OPCODE FUNCTION DESCRIPTION

01 clear clear trip indicators 08 disable watchdog reset main processor 02 remote settings simulation dials 09 enable service activate service relay & indicator 03 normal settings front panel dials 0A disable service deactivate service relay & 04 simulation on simulation currents 05 simulation off actual currents 0B disable relays disable output relays 06 test I/O on setpoint control of I/O 0C enable relays enable output relays 07 test I/O off normal control of I/O 0D clear last trips clear 5 causes of last trips

indicator

Simulation and I/O test commands are for production testing and training simulation. Commands 02 - 07 will be ignored unless communications "TEST" switch 8 is on. When a REMOTE SETTINGS command is received (TEST switch=on) the

front panel switch settings are replaced by the dial settings loaded into setpoint memory. Send command NORMAL SETTINGS to restore selection of front panel dial settings. If command SIMULATION ON is sent the actual phase and ground current are replaced by the pre-loaded values in setpoint memory. The relay will respond as if these are the actual dial settings and measured current values. This mode continues until power is lost or until the command "SIMULATION OFF" is received or TEST switch 8 is set to off. Setpoints used in this mode are stored in RAM memory and are erased when control power is lost. The relay may behave erratically if invalid values are loaded into setpoint memory.

To turn on relays, LEDs and the bargraph un der com pu ter c on trol for testing purposes, the ap pro pria t e I/ O t es t pa ttern s a r e first loaded as setpoints using STORE SETPOINTS function 06 or 16. Then command "TEST I/O ON" is issued. Normal relay control of this I/O hardware is suspended and the test patterns in setpoint memory are substituted. This continues until a "TEST I/O OFF" command is received or control power is removed or TEST switch 8=off.

During testing, no rmal prot ection is disabl ed. As a safegua rd, al l test an d simu lation comm ands are ignored unles s switc h 8 is in the TEST on=1 position.

Message Format and Example:

Request slave 11 to execute operation code 1 (clear trip indicators).

MASTER TRANSMISSION: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 11 message for slave 11 FUNCTION CODE 1 05 execute operation OPERATION CODE 2 00 01 operation code 1 = clear trip indicators CODE VALUE 2 FF 00 perform function CRC 2 ?? ?? CRC calculated by the master

SLAVE RESPONSE: BYTES EXAMPLE / DESC R I PT IO N

SLAVE ADDRESS 1 11 response message from slave 11 FUNCTION CODE 1 05 execute operation OPERATION CODE 2 00 01 operation code 1 = clear trip indicators CODE VALUE 2 FF 00 perform function CRC 2 ?? ?? CRC calculated by the slave

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4.2.5 FUNCTION CODE 06: STORE SINGLE SETPOINT

Modbus Implementation: Preset Sing le Register 735/737 Implementation: Store Single Setpoint

This command allows the m aster to st ore a sing le setpo int into the memory of a slave device . The slav e devi ce respo nse to this function code is to echo the entire master transmission. Note that broadcast mode is not allowed with this function code. When a broadcast transmission is sent by the master (that is, SLAVE ADDRESS = 0) the message will be ignored.

Message Format and Example:

Request slave 11 to store the value 039E in setpoint address 0049. After the transmission in this example is complete, setpoints address 0049 will contain the value 039E.

MASTER TRANSMISSION: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 11 message for slave 11 FUNCTION CODE 1 06 store single setpoint DATA STARTING ADDRESS 2 00 49 s etpoint address 0049h DATA 2 03 9E data for address 0049h CRC 2 ?? ?? CRC calculated by the master

SLAVE RESPONSE: BYTES EXAMPLE / DESC R I PT IO N

SLAVE ADDRESS 1 11 response message from slave 11 FUNCTION CODE 1 06 store single setpoint DATA STARTING ADDRESS 2 00 49 s etpoint address 0049h DATA 2 03 9E data stored in 0049h CRC 2 ?? ?? CRC calculated by the slave

4.2.6 FUNCTION CODE 07: READ STATUS

Modbus Implementation: Read Exception Status 735/737 Implementati on: Read General Status

This is a function us ed to quickly read the stat us of a sel ec t ed rela y. A short message length al lows for rapid reading of status. The status byte returned is the lower 8 bits of the relay status register defined in the memory map. Note that broadcast mode is not allowed with this function c ode. The maste r trans miss ion w ill be ig nored by all sl aves if broadca st mod e is use d with this function code.

Message Format and Example:

Request status from slave 11. The status is stored in actual values memory map location 0014H. Assume the value is 011011 01b.

MASTER TRANSMISSION: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 11 message for slave 11 FUNCTION CODE 1 07 read device status CRC 2 ?? ?? CRC calculated by the master

SLAVE RESPONSE: BYTES EXAMPLE / DESC R I PT IO N

SLAVE ADDRESS 1 11 response message from slave 11 FUNCTION CODE 1 07 read device status CODE VALUE 1 6D status = 001101101 (binary) CRC 2 ?? ?? CRC calculated by the slave

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4.2.7 FUNCTION CODE 16: STORE MULTIPLE SETPOINTS

Modbus Implementation: Preset Multiple Registers 735/737 Implementati on: Store Multiple Setpoints

This function code allows multiple setpoints to be stored into the 735/737 memory for test purposes only. Modbus "registers" are 16 bit (two byte) values transmitted high order byte first. Thus all 735/737 setpoints are sent as two bytes. The slave device respo nse to thi s func tion c ode is to echo th e slav e addre ss, fu nction c ode, st arting a ddre ss, the nu mber o f se tpoints loaded, and the CRC.

For production testing and training simulation without a current source, setpoint values can be loaded into RAM. These are lost at power down. Using the multiple setpoints store command, phase and ground dial setting setpoints are first stored in memory. Simulated values for phase and ground current can also be loaded.

To enter si mulati on mode , "TES T" swit ch #8 must be on. Fu nctio n code 05 exec ute oper ation sends co mmand "SIMULA TION ON". If test switch 8 is off, this command is ign ored . On rece ip t of the " SIMUL ATION ON" command values for phase and ground current from setpoint memory replace the actual measured currents.

The relay responds as if these current were actually being measured. If execute operation command "REMOTE SETTINGS" is also sent, front pan el dial setti ngs wi ll be repla ced by the previou sly sent dia l setpo ints. The se valu es cont inue to be used until contro l p ow er i s remov ed o r com ma nds "SI MULATION OFF" and "NORMAL SETTIN GS" is received or TEST switch 8=off.

Setpoint test patterns can also be stored for forcing relays and LEDs and the bargraph to test outputs. Using this setpoint store command the test pattern is first stored. The Execute Operation function 05 command "TEST I/O ON" is issued. The LEDs, relays and bargraph are driven by the test patterns stored in setpoints instead of relay control until command "TEST I/O OFF" is received, control power is lost or TEST switch 8=off.

Message Format and Example:

To perform a simulation on relay slave address 11H, the following simulated dial settings and input currents are required:

DIAL REQUIRED VALUE LOAD (H) ADDR (H)

phase pickup 60% of CT 0005 0060 phase curve shape normal inverse (LO) 0005 0061 phase time multiplier 7 0007 0062 phase instantaneous off 0001 0063 ground pickup 100% of CT 000A 0064 ground curve shape very inverse (HI) 0008 0065 ground time multiplier 3 0003 0066 ground instantaneous 0.8 x CT 0005 0067 phase current 120% of CT ???? 0068 ground current 50% of CT ???? 0069

1. Set the communications TEST switch ON.

2. Load the dial settings and current values in setpoint memory using this function code

3. Issue the Function Code 5: EXECUTE OPERATION op code 02: REMOTE SETTINGS to select the dial settings from memory just sent.

4. Issue the Function Code 5: EXECUTE OPERATION op code 04: SIMULATION ON to enable the relay to see the phase and ground currents loaded into setpoint memory. The relay will begin timing out if an overcurrent condition occurs.

5. Issue the Function Code 5: EXECUTE OPERATION op code 05: SIMULATION OFF to remove the simulated current.

The master transmission / slave response message format example for this function code is shown on the following page:

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MASTER TRANSMISSION: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 11 message for slave 11 FUNCTION CODE 1 10 store setpoint block DATA STARTING ADDRESS 2 00 60 fi rst setpoint address 0060h NUMBER OF SETPOINTS 2 00 0A 10 setpoints DATA BYTE COUNT 1 14 20 bytes of setpoint data DATA #1 2 00 06 phase pickup = position 6 DATA #2 2 00 05 phase shape = position 5 DATA #3 2 00 07 phase time multiplier = 7 DATA #4 2 00 01 phase instantaneous = off DATA #5 2 00 0A ground pickup = 10 (100% of CT) DATA #6 2 00 08 ground curve shape = 8 (very inverse) DATA #7 2 00 03 ground time multiplier = 3 DATA #8 2 00 05 ground instantaneous = 5 (0.8 x CT) DATA #9 2 00 7B phase current = 7B (120%) DATA #10 2 00 32 ground current = 32 (50%) CRC 2 ?? ?? CRC calculated by the master

SLAVE RESPONSE: BYTES EXAMPLE / DESC R I PT IO N

SLAVE ADDRESS 1 11 response message from slave 11 FUNCTION CODE 1 10 store setpoint block DATA STARTING ADDRESS 2 00 50 block start address NUMBER OF SETPOINTS 2 00 0A 10 setpoints (2 bytes each) CRC 2 ?? ?? CRC calculated by the slave

Note: for 16 bit transfers hi byte is transmitted first. For example, 0050h is transmitted 00h then 50h

4.2.8 ERROR RESPONSES

When a 735/737 detects an error other than a CRC error, a response will be sent to the master. The most significant bit of the FUNCTION CODE byte will be set to 1 (that is, the function code sent from the slave will be equal to the function code sent from the master p lus 12 8). The b yte whi ch foll ows it wi ll be a n exc eption code i ndica ting th e type o f error th at occ urred. Transmissions received from the master with CRC errors will be ignored by the 735/737.

The slave response to an error (other than CRC error) will be:

• SLAVE ADDRESS: 1 byte

• FUNCTION CODE: 1 byte (with MSbit set to 1)

• EXCEPTION CODE: 1 byte

• CRC: 2 bytes The 735/737 implements the following exception response codes.

• 01: ILLEGAL FUNCTION: The function code transmitted is not one of the functions supported by the 735/737.

• 02: ILLEGAL DATA ADDRESS: The address refe renc ed i n th e data field transmitted b y the m ast er i s no t an a llowable

address for the 735/737.

• 03: ILLEGAL DATA VALUE: The value referen ced in the dat a field transm itted b y the mas ter is n ot withi n range for the

selected data address.

• 06: BUSY, REJECTED MESSAGE: The transmission was received error-free but the request could not be performed.

• 08: MEMORY PARITY ERROR: A hardware error has occurred in the 735/737. For example, a RAM failure has

occurred and the data requested cannot be sent.

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4.3 MEMORY MAP 4 MODBUS COMMUNICATIONS

4.3 MEMORY MAP 4.3.1 MODBUS MEMORY MAP

The data stored in the 735/737 is grouped as actual values and setpoints. Setpoints can be read and written by a master computer. Actual values can only be read. All setpoints and actual values are stored as two byte values. That is, each address listed in the memory map is the address of a two byte value. Addresses are listed in hexadecimal. Data values (setpoint ranges, in crem en ts , et c.) are lis ted in decimal. Cons ult the units, step an d range as well as for ma t tables following the memory map for interpretation of register values.

Table 4–1: 735/737 MODBUS MEMORY MAP (Sheet 1 of 2)

GROUP ADDR DESCRIPTION RANGE STEP UNITS FOR-

PRODUCT ID 0000 GE product device code 25, 26 --- --- F1 25=735,26=737

0001 GE product hardware revision code 1 to 26 --- --- F1 4=D 0002 GE product firmware revision code 1 to 255 --- --- F3 01, 00 = 1.0 0003 GE product modification file number 0 to 1000 --- --- F1 0 = no mod 0004 Reserved --- --- --- --- ---

↓↓ ↓ ↓↓↓ ↓

000F Reserved --- --- --- --- ---

MONITORED DATA

PRE-TRIP DATA

0010 Phase A current 0 to 2000 1 % CT F1 --0011 Phase B current 0 to 2000 1 % CT F1 --0012 Phase C current 0 to 2000 1 % CT F1 --0013 Ground current 0 to 2000 1 % CT F1 --0014 Relay Status Register --- 1 --- F 101 --0015 Output relays --- --- --- F103 --0016 Not used --- --- --- --- --0017 LEDs --- --- --- F105 --0018 Bargraph --- --- --- F106 --0019 Not used --- --- --- --- ---

↓↓ ↓ ↓↓↓ ↓

001F Not used --- --- --- --- --0020 Phase A pre-trip current 0 to 2000 1 % CT F1 --0021 Phase B pre-trip current 0 - 2000 1 % CT F1 --0022 Phase C pre-trip current 0 to 2000 1 % CT F1 --0023 Ground pre-trip current 0 to 2000 1 % CT F1 --0024 Cause of last trip Bits --- --- F113 --0025 Last OC trip time 0 to 65000 1 ms F115 --0026 Cause of second last trip Bits --- --- F113 --0027 Cause of third last trip Bits --- --- F113 --0028 Cause of fourth last trip Bits --- --- F113 --0029 Cause of fifth last trip Bits --- --- F113 ---

MAT

FACTORY

DEFAULT

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Table 4–1: 735/737 MODBUS MEMORY MAP (Sheet 2 of 2)

GROUP ADDR DESCRIPTION RANGE STEP UNITS FOR-

SYSTEM CONFIG

SETPOINTS DIAL SETTINGS FOR SIMULA TION AND TEST I/O

CUSTOM SCHEME

COMMANDS 0063 Reset 0 to 1 1 1=reset F1 0

002A Phase Pickup dial settin 002B Phase Curve Shape dial settin 002C Phase Time Multiplier dial settin 002D Phase Instantaneous dial settin 002E Ground Pickup dial settin 002F Ground Curve Shape dial settin 0030 Ground Time Multiplier dial settin 0031 Ground Instantaneous dial settin 0032 Comm DIP switch settin 0033 Curve shift switch settin 0034 Reset switch status 0-1 1 1=on F1 --0035 Not used --- --- --- --- ---

↓↓ ↓ ↓↓↓ ↓

004F Not used --- --- --- --- --0050 Phase Pickup dial (Remote) 1 to 19 1 dial F108 0 0051 Phase Curve Shape dial (Remote) 1 to 5 1 dial F104 0 0052 Phase Time Multiplier dial (Remote) 1 to 10 1 dial F112 0 0053 Phase Instantaneous dial (Remote) 1 to 10 1 dial F109 0 0054 Ground Pickup dial (Remote) 1 to 19 1 dial F110 0 0055 Ground Curve Shape dial (Remote) 1 to 5 1 dial F104 0 0056 Ground Time Multiplier dial (Remote) 1 to 10 1 dial F112 0 0057 Ground Instantaneous dial (Remote) 1 to 10 1 dial F111 0 0058 Phase A current (Simulation) 0 to 2000 1 % CT F1 0 0059 Phase B current (Simulation) 0 to 2000 1 % CT F1 0 005A Phase C current (Simulation) 0 to 2000 1 % CT F1 0 005B Ground current (Simulation) 0 to 2000 1 % CT F1 0 005C Output relays (Test - I/O) Bits --- --- F103 0 005D LED (Test - I/O) Bits --- --- F105 0 005E Bar 005F Curve shift switch Bits --- --- F114 0 0060 Curve Shape 0 to 2 1 --- F116 0 0061 Block Instantaneous 0 to 180 1 0=OFF F117 OFF 0062 Aux Trip Relay 0 to 2 1 --- F118 0

0064 Clear Last Trips 0 to 1 1 1=clear F1 0 0065 Not used --- --- --- --- ---

↓↓ ↓ ↓↓↓ ↓

006F Not used --- --- --- --- ---

raph (Test - I/O) Bits --- --- F106 0

1 to 19 1 dial F108 --1 to 10 1 dial F107 --1 to 10 1 dial F112 --1 to 10 1 dial F109 --1 to 19 1 dial F110 --1 to 10 1 dial F107 --1 to 10 1 dial F112 ---

1 to 10 1 dial F111 ---

--- --- --- F102 ---

--- --- --- F1 14 ---

MAT

FACTORY

DEFAULT

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Table 4–2: 735/737 MEMORY MAP DATA FORMATS (Sheet 1 of 5)

FORMAT TYPE DESCRIPTION

F1 UNSIGNED INTEGER 0 to 65535 F2 UNSIGNED INTEGER

1 DECIMAL PLACE F3 2 UNSIGNED CHARACTERS 0 to 255, 0 to 255 F4 SIGNED INTEGER –32768 to 32767 F101 STATUS BYTE XXXX XXXX XXXX XXX1 = Phase A pickup

F102 DIP Switches XXXX XXXX XXXX XXX1 = Switch 1 on=1

F103 MAIN OUTPUT RELAYS

(READ ONLY)

0 to 6553.5

XXXX XXXX XXXX XX1X = Phase B pickup XXXX XXXX XXXX X1XX = Phase C pickup XXXX XXXX XXXX 1XXX = Ground pickup XXXX XXXX XXX1 XXXX = R elay in service XXXX XXXX XX1X XXXX = Service required XXXX XXXX X1XX XXXX = Test mode XXXX XXXX 1XXX XXXX = Relay tripped XXXX XXX1 XXXX XXXX = not used XXXX XX1X XXXX XXXX = not used XXXX X1XX XXXX XXXX = not used XXXX 1XXX XXXX XXXX = not used XXX1 XXXX XXXX XXXX = not used XX1X XXXX XXXX XXXX = trip relays disabled = 1 X1XX XXXX XXXX XXXX = simulated dials = 1 1XXX XXXX XXXX XXXX = simulated current = 1

XXXX XXXX XXXX XX 1 X = Switch 2 on = 1 XXXX XXXX XXXX X1XX = Switch 3 on = 1 XXXX XXXX XXXX 1XXX = Switch 4 on = 1 XXXX XXXX XXX1 XXXX = Switc h 5 on = 1 XXXX XXXX XX1X XXXX = Switc h 6 on = 1 XXXX XXXX X1XX XXXX = Switc h 7 on = 1 XXXX XXXX 1XXX XXXX = Switch 8 on = 1 XXXX XXXX XXXX XXX1 = Trip relay on = 1 XXXX XXXX XXXX XX1X = Aux trip relay on =1 XXXX XXXX XXXX X1XX = Service relay on = 1 XXXX XXXX XXXX 1XXX = not used XXXX XXXX XXX1 XXXX = not used XXXX XXXX XX1X XXXX = not used XXXX XXXX X1XX XXXX = not used XXXX XXXX 1XXX XXXX = not used

4.3.2 MEMORY MAP DATA FORMATS

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Table 4–2: 735/737 MEMORY MAP DATA FORMATS (Sheet 2 of 5)

FORMAT TYPE DESCRIPTION

F103 continued

F104 CURVE SHAPE SETPOINT Definite time = 1

F105 LEDs

F106 BARGRAPH

F107 CURVE SHAPE SWITCH Definite time (low) = 1

737 OUTPUT RELAYS XXX X XXX1 XXXX XX XX = Phase A time OC pickup/trip (51P-A)

XXXX XX1X XXXX XXXX = Phase B time OC pickup/trip (51P-B) XXXX X1XX XXXX XXXX = Phase C time OC pickup/trip (51P-C) XXXX 1XXX XXXX XXXX = Ground time OC pickup/trip (51G) XXX1 XXXX XXXX XXXX = Phase A nest pickup/trip (50P-A) XX1X XXXX XXXX XXXX = Phase B nest pickup/trip (50P-B) X1XX XXXX XXXX XXXX = Phase C nest pickup/trip (50P-C) 1XXX XXXX XXXX XXXX = Ground nest pickup/trip (50G)

Moderately Inverse = 2 Normal Inverse = 3 Very Inverse = 4 Extremely Inverse = 5 XXXX XXXX XXXX XXX1 = Phase A overcurrent LED on = 1

(READ ONLY)

(ACTUAL VALUE)

XXXX XXXX XXXX XX1X = Phase B overcurrent LED on = 1 XXXX XXXX XXXX X1XX = Phase C overcurrent LED on = 1 XXXX XXXX XXXX 1XXX = Ground overcurrent LED on = 1 XXXX XXXX XXX1 XXXX = Phase A instantaneous LED on = 1 XXXX XXXX XX1X XXXX = Phase B instantaneous LED on = 1 XXXX XXXX X1XX XXXX = Phase C instantaneous LED on = 1 XXXX XXXX 1XXX XXXX = Ground instantaneous LED on = 1 XXXX XXX1 XXXX XXXX = Phase pickup LED on = 1 XXXX XX1X XXXX XXXX = Ground pickup LED on = 1 XXXX X1XX XXXX XXXX = Relay in service LED on = 1 XXXX 1XXX XXXX XXXX = Service required LED on = 1 XXXX XXXX XXXX XXX1 = 100% indicator on = 1 XXXX XXXX XXXX XX1X = 90% indicator on = 1 XXXX XXXX XXXX X1XX = 80% indicator on = 1 XXXX XXXX XXXX 1XXX = 70% indicator on = 1 XXXX XXXX XXX1 XXXX = 60% indicator on = 1 XXXX XXXX XX1X XXXX = 50% indicator on = 1 XXXX XXXX X1XX XXXX = 40% indicator on = 1 XXXX XXXX 1XXX XXXX = 30% indicator on = 1 XXXX XXX1 XXXX XXXX = 20% indicator on = 1 XXXX XX1X XXXX XXXX = 10% indicator on = 1

Definite time (hi Moderately Inverse (low) = 3 Moderately Inverse (hi Normal Inverse (low) = 5 Normal Inverse (hi Very Inverse (low) = 7

h) = 2

h) = 4

h) = 6

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Table 4–2: 735/737 MEMORY MAP DATA FORMATS (Sheet 3 of 5)

FORMAT TYPE DESCRIPTION

F107 continued

F108 PHASE PICKUP SWITCH OFF = 1

F109 PHASE INSTANTANEOUS DIAL OFF = 1

F110 Ground fault pickup OFF = 1

CURVE SHAPE SWITCH

continued

Very Inverse (high) = 8 Extremely Inverse (low) = 9 Extremely Inverse (hi

20 = 2 30 = 3 40 = 4 50 = 5 60 = 6 70 = 7 80 = 8 90 = 9 100 = 10 110 = 11 120 = 12 130 = 13 140 = 14 150 = 15 160 = 16 180 = 17 200 = 18 220 = 19

4 = 2 5 = 3 6 = 4 8 = 5 10 = 6 12 = 7 14 = 8 16 = 9 20 = 10

15 = 2 20 = 3 25 = 4 30 = 5 35 = 6 40 = 7 45 = 8 50 = 9 55 = 10

h) = 10

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Table 4–2: 735/737 MEMORY MAP DATA FORMATS (Sheet 4 of 5)

FORMAT TYPE DESCRIPTION

F110 continued

F111 GROUND INST DIAL OFF = 1

F112 TIME MULTIPLIER DIAL 1 = 1

F113 CAUSE OF TRIP XXXX XXXX XXXX XXX1 = Phas e A time OC trip

60 = 11 65 = 12 70 = 13 75 = 14 80 = 15 85 = 16 90 = 17 95 = 18 100 = 19

0.1 = 2

0.2 = 3

0.4 = 4

0.8 = 5 1 = 6 2 = 7 4 = 8 8 = 9 16 = 10

2 = 2 3 = 3 4 = 4 5 = 5 6 = 6 7 = 7 8 = 8 9 = 9 10 = 10

XXXX XXXX XXXX XX1 X = Phase B time OC tri p XXXX XXXX XXXX X1XX = Phase C time OC trip XXXX XXXX XXXX 1XXX = Ground time OC trip XXXX XXXX XXX1 XXXX = Phase A inst t ri p XXXX XXXX XX1X XXXX = Phase B inst trip XXXX XXXX X1XX XXXX = Phase C inst trip XXXX XXXX 1XXX XXXX = Ground inst trip

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Table 4–2: 735/737 MEMORY MAP DATA FORMATS (Sheet 5 of 5)

FORMAT TYPE DESCRIPTION

F114 CURVE SHIFT SETPOINT XXXX XXXX XX XX XXX1 = Sw itc h 8 on = 1

XXXX XXXX XXXX XX 1 X = Switch 7 on = 1 XXXX XXXX XXXX X1XX = Switch 6 on = 1 XXXX XXXX XXXX 1XXX = Switch 5 on = 1 XXXX XXXX XXX1 XXXX = Switc h 4 on = 1 XXXX XXXX XX1X XXXX = Switc h 3 on = 1 XXXX XXXX X1XX XXXX = Switc h 2 on = 1 XXXX XXXX 1XXX XXXX = Switch 1 on = 1

F115 LAST OC TRIP TIME 0 to 65000 = Actual Trip Time

65001 = Trip time > 65 seconds 65535 = Time not available

F116 CURVE SHAPE 0 = ANSI

1 = IAC

F117 BLOCK INSTANTANEOUS 0 = DISABLED

F118 AUX TRIP RELAY 0 = Main Trip

2 = IEC/BS142

1 to 180 seconds

1 = 86 Lockout 2 = Ground Trip

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5 OVERCURRENT CURVES 5.1 OVERVIEW 5.1.1 DESCRIPTION

This chapter lists the 3 possible curve types, and their corresponding curve shapes. They are listed as follows:

ANSI CURVES

• Moderately Inverse

•Normal Inverse

•Very Inverse

• Extremely Inverse

• Definite Time

IAC CURVES

• IAC Short Time

•IAC Inverse

• IAC Very Inverse

• IAC Extremely Inverse

• Definite Time

IEC/BS142 CURVES

• IEC Short Time

• IEC A (Normal Inverse)

• IEC B (Very Inverse)

• IEC C (Extremely Inverse)

• Definite Time For the graphs shown in this chapter, the per unit value (on the x-axis) is given as:

where:

--- -

Per Unit

= current input to relay

= pickup current setpoint

CT = CT secondary, that is1 or 5 A

--------------------------------------- -

⁄()

100

GE Power Management

735/737 Feeder Protection Relay 5-1

Page 64

5.2 ANSI CURVES 5 OVERCURRENT CURVES

5.2 ANSI CURVES 5.2.1 ANSI MODERATELY INVERSE CURVES

The trip time is given by:



TSMA

××

 

++ +

--------------------------- -

⁄()

–

---------------------------------- -

⁄()

()

–

where: T = trip time (in seconds) A = 0.1735 (curve shape constant)

S = curve shift multiplier B = 0.6791 (curve shape constant) M = 735/737 curve multiplier setpoint C = 0.8000 (curve shape constant) I = input current (in amps) D = –0.0800 (curve shape constant) Ipu = pickup current setpoint E = 0.1271 (curve shape constant)

SHIFTSCURVE

1 1 9.744 1.351 0.757 0.478 0.382 0.332 0.302 0.281 0.267 0.255 0.247 0.221 0.209

0.5 1 4.872 0.675 0.379 0.239 0.191 0.166 0.151 0.141 0.133 0.128 0.123 0.110 0.104

0.8 1 7.795 1.081 0.606 0.382 0.305 0.266 0.242 0.225 0.213 0.204 0.197 0.177 0.167

1.1 1 10. 719 1.486 0.833 0.525 0.420 0.366 0.332 0.310 0.293 0.281 0.271 0.243 0.230

1.05 1.50 2.00 3. 00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

2 19.489 2. 702 1.515 0.955 0.764 0.665 0.604 0.563 0.533 0.511 0.493 0.442 0.417 3 29.233 4. 053 2.272 1.433 1.145 0.997 0.906 0.844 0.800 0.766 0.740 0.663 0.626 4 38.977 5. 404 3.030 1.910 1.527 1.329 1.208 1.126 1.066 1.021 0.986 0.884 0.835 5 48.722 6. 755 3.787 2.388 1.909 1.662 1.510 1.407 1.333 1.277 1.233 1.105 1.043 6 58.466 8. 106 4.544 2.866 2.291 1.994 1.812 1.689 1.600 1.532 1.479 1.326 1.252 7 68.210 9. 457 5.302 3.343 2.672 2.327 2.114 1.970 1.866 1.788 1.726 1.547 1.461 8 77.954 10.807 6.059 3.821 3.054 2.659 2.416 2.252 2.133 2.043 1.972 1.768 1.669 9 87.699 12.158 6.817 4.298 3.436 2.991 2.718 2.533 2.400 2.298 2.219 1.989 1.878

10 97.443 13.509 7.574 4.776 3.818 3.324 3.020 2.815 2.666 2.554 2.465 2.210 2.087

2 9.744 1.351 0.757 0.478 0.382 0.332 0.302 0.281 0.267 0.255 0.247 0.221 0.209 3 14.616 2. 026 1.136 0.716 0.573 0.499 0.453 0.422 0.400 0.383 0.370 0.331 0.313 4 19.489 2. 702 1.515 0.955 0.764 0.665 0.604 0.563 0.533 0.511 0.493 0.442 0.417 5 24.361 3. 377 1.894 1.194 0.954 0.831 0.755 0.704 0.667 0.638 0.616 0.552 0.522 6 29.233 4. 053 2.272 1.433 1.145 0.997 0.906 0.844 0.800 0.766 0.740 0.663 0.626 7 34.105 4. 728 2.651 1.672 1.336 1.163 1.057 0.985 0.933 0.894 0.863 0.773 0.730 8 38.977 5. 404 3.030 1.910 1.527 1.329 1.208 1.126 1.066 1.021 0.986 0.884 0.835 9 43.849 6. 079 3.408 2.149 1.718 1.496 1.359 1.267 1.200 1.149 1.109 0.994 0.939

10 48.722 6.755 3.787 2.388 1.909 1.662 1.510 1.407 1.333 1.277 1.233 1.105 1.043

2 15.591 2. 161 1.212 0.764 0.611 0.532 0.483 0.450 0.427 0.409 0.394 0.354 0.334 3 23.386 3. 242 1.818 1.146 0.916 0.798 0.725 0.676 0.640 0.613 0.592 0.530 0.501 4 31.182 4. 323 2.424 1.528 1.222 1.064 0.967 0.901 0.853 0.817 0.789 0.707 0.668 5 38.977 5. 404 3.030 1.910 1.527 1.329 1.208 1.126 1.066 1.021 0.986 0.884 0.835 6 46.773 6. 484 3.636 2.292 1.833 1.595 1.450 1.351 1.280 1.226 1.183 1.061 1.002 7 54.568 7. 565 4.242 2.675 2.138 1.861 1.691 1.576 1.493 1.430 1.381 1.237 1.169 8 62.364 8. 646 4.847 3.057 2.443 2.127 1.933 1.802 1.706 1.634 1.578 1.414 1.335 9 70.159 9. 727 5.453 3.439 2.749 2.393 2.175 2.027 1.920 1.839 1.775 1.591 1.502

10 77.954 10.807 6.059 3.821 3.054 2.659 2.416 2.252 2.133 2.043 1.972 1.768 1.669

2 21.437 2. 972 1.666 1.051 0.840 0.731 0.664 0.619 0.587 0.562 0.542 0.486 0.459 3 32.156 4. 458 2.499 1.576 1.260 1.097 0.997 0.929 0.880 0.843 0.814 0.729 0.689 4 42.875 5. 944 3.333 2.101 1.680 1.462 1.329 1.239 1.173 1.124 1.085 0.972 0.918 5 53.594 7. 430 4.166 2.627 2.100 1.828 1.661 1.548 1.466 1.404 1.356 1.215 1.148 6 64.312 8. 916 4.999 3.152 2.520 2.194 1.993 1.858 1.760 1.685 1.627 1.458 1.377 7 75.031 10.402 5.832 3.677 2.940 2.559 2.326 2.167 2.053 1.966 1.898 1.701 1.607 8 85.750 11.888 6.665 4.203 3.360 2.925 2.658 2.477 2.346 2.247 2.169 1.945 1.836 9 96.469 13.374 7.498 4.728 3.780 3.290 2.990 2.787 2.640 2.528 2.441 2.188 2.066

10 107.187 14. 860 8.332 5.253 4.200 3.656 3.322 3.096 2.933 2.809 2.712 2.431 2.295

CURRENT (per unit I /I0)

---------------------------------- -

⁄()

()

–

5-2 735/737 Feeder Protection Relay

GE Power Management

Page 65

5 OVERCURRENT CURVES 5.2 ANSI CURVES

735/737 ANSI

1000

100

GE POWER MANAGEMENT

MODERATELY INVERSE CURVES

TIME MULTIPLIER

TIME IN SECONDS

0.1

0.01

0.01 0.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–1: ANSI MODERATELY INVERSE CURVES

9 8 7

6 5

803658A4.CDR

GE Power Management

735/737 Feeder Protection Relay 5-3

Page 66

5.2 ANSI CURVES 5 OVERCURRENT CURVES

5.2.2 ANSI NORMAL INVERSE CURVES

The trip time is given by:



TSMA

××

 

++ +

--------------------------- -

⁄()

–

---------------------------------- -

⁄()

()

–

where: T = trip time (in seconds) A = 0.0274 (curve shape constant)

S = curve shift multiplier B = 2.2614 (curve shape constant) M = 735/737 curve multiplier setpoint C = 0.3000 (curve shape constant) I = input current (in amps) D = –4.1899 (curve shape constant) Ipu = pickup current setpoint E = 9.1272 (curve shape constant)

SHIFTSCURVE

1 1 17.229 4.284 1.766 0.754 0.513 0.407 0.344 0.302 0.270 0.246 0.226 0.165 0.133

0.5 1 8.614 2.142 0.883 0.377 0.256 0.203 0.172 0.151 0.135 0.123 0.113 0.082 0.066

0.8 1 13. 783 3.427 1.412 0.603 0.410 0.325 0.276 0.242 0.216 0.197 0.181 0.132 0.106

1.1 1 18. 952 4.713 1.942 0.829 0.564 0.447 0.379 0.332 0.297 0.270 0.249 0.181 0.146

1.05 1.50 2.00 3. 00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

2 34.457 8. 568 3.531 1.508 1.025 0.813 0.689 0.604 0.541 0.492 0.452 0.329 0.265 3 51.686 12.852 5.297 2.262 1.538 1.220 1.033 0.906 0.811 0.737 0.678 0.494 0.398 4 68.915 17.137 7.062 3.016 2.051 1.627 1.378 1.208 1.082 0.983 0.904 0.659 0.530 5 86.143 21.421 8.828 3.769 2.563 2.034 1.722 1.509 1.352 1.229 1.130 0.823 0.663 6 103.372 25.705 10.593 4.523 3.076 2.440 2.067 1.811 1.622 1.475 1.356 0.988 0.795 7 120.600 29.989 12.359 5.277 3.589 2.847 2.411 2.113 1.893 1.721 1.582 1.153 0.928 8 137.829 34.273 14.124 6.031 4.101 3.254 2.755 2.415 2.163 1.966 1.808 1.317 1.060 9 155.058 38.557 15.890 6.785 4.614 3.661 3.100 2.717 2.433 2.212 2.034 1.482 1.193

10 172.286 42.841 17.656 7.539 5.127 4.067 3.444 3.019 2.704 2.458 2.260 1.647 1.326

2 17.229 4. 284 1.766 0.754 0.513 0.407 0.344 0.302 0.270 0.246 0.226 0.165 0.133 3 25.843 6. 426 2.648 1.131 0.769 0.610 0.517 0.453 0.406 0.369 0.339 0.247 0.199 4 34.457 8. 568 3.531 1.508 1.025 0.813 0.689 0.604 0.541 0.492 0.452 0.329 0.265 5 43.072 10.710 4.414 1.885 1.282 1.017 0.861 0.755 0.676 0.614 0.565 0.412 0.331 6 51.686 12.852 5.297 2.262 1.538 1.220 1.033 0.906 0.811 0.737 0.678 0.494 0.398 7 60.300 14.994 6.179 2.639 1.794 1.424 1.205 1.057 0.946 0.860 0.791 0.576 0.464 8 68.915 17.137 7.062 3.016 2.051 1.627 1.378 1.208 1.082 0.983 0.904 0.659 0.530 9 77.529 19.279 7.945 3.392 2.307 1.830 1.550 1.359 1.217 1.106 1.017 0.741 0.596

10 86.143 21.421 8.828 3.769 2.563 2.034 1.722 1.509 1.352 1.229 1.130 0.823 0.663

2 27.566 6. 855 2.825 1.206 0.820 0.651 0.551 0.483 0.433 0.393 0.362 0.263 0.212 3 41.349 10.282 4.237 1.809 1.230 0.976 0.827 0.725 0.649 0.590 0.542 0.395 0.318 4 55.132 13.709 5.650 2.412 1.641 1.302 1.102 0.966 0.865 0.787 0.723 0.527 0.424 5 68.915 17.137 7.062 3.016 2.051 1.627 1.378 1.208 1.082 0.983 0.904 0.659 0.530 6 82.697 20.564 8.475 3.619 2.461 1.952 1.653 1.449 1.298 1.180 1.085 0.790 0.636 7 96.480 23.991 9.887 4.222 2.871 2.278 1.929 1.691 1.514 1.376 1.265 0.922 0.742 8 110.263 27.418 11.300 4.825 3.281 2.603 2.204 1.932 1.730 1.573 1.446 1.054 0.848 9 124.046 30.846 12.712 5.428 3.691 2.929 2.480 2.174 1.947 1.770 1.627 1.186 0.954

10 137.829 34.273 14.124 6.031 4.101 3.254 2.755 2.415 2.163 1.966 1.808 1.317 1.060

2 37.903 9. 425 3.884 1.659 1.128 0.895 0.758 0.664 0.595 0.541 0.497 0.362 0.292 3 56.855 14.138 5.826 2.488 1.692 1.342 1.137 0.996 0.892 0.811 0.746 0.543 0.437 4 75.806 18.850 7.768 3.317 2.256 1.790 1.515 1.328 1.190 1.082 0.994 0.725 0.583 5 94.758 23.563 9.711 4.146 2.820 2.237 1.894 1.660 1.487 1.352 1.243 0.906 0.729 6 113.709 28.275 11.653 4.976 3.384 2.685 2.273 1.993 1.784 1.622 1.491 1.087 0.875 7 132.661 32.988 13.595 5.805 3.948 3.132 2.652 2.325 2.082 1.893 1.740 1.268 1.021 8 151.612 37.700 15.537 6.634 4.512 3.579 3.031 2.657 2.379 2.163 1.989 1.449 1.166 9 170.564 42.413 17.479 7.463 5.076 4.027 3.410 2.989 2.677 2.433 2.237 1.630 1.312

10 189.515 47.125 19.421 8.293 5.640 4.474 3.789 3.321 2.974 2.704 2.486 1.812 1.458

CURRENT (per unit I /I0)

---------------------------------- -

⁄()

()

–

5-4 735/737 Feeder Protection Relay

GE Power Management

Page 67

5 OVERCURRENT CURVES 5.2 ANSI CURVES

735/737 ANSI

GE POWER MANAGEMENT

1000

100

NORMAL INVERSE CURVE

TIME IN SECONDS

0.1

TIME MULTIPLIER

9 8 7

6 5

0.01

GE Power Management

0.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–2: ANSI NORMAL INVERSE CURVES

735/737 Feeder Protection Relay 5-5

803662A4.CDR

Page 68

5.2 ANSI CURVES 5 OVERCURRENT CURVES

5.2.3 ANSI VERY INVERSE CURVES

The trip time is given by:



TSMA

××

 

++ +

--------------------------- -

⁄()

–

---------------------------------- -

⁄()

()

–

where: T = trip time (in seconds) A = 0.0615 (curve shape constant)

S = curve shift multiplier B = 0.7989 (curve shape constant) M = 735/737 curve multiplier setpoint C = 0.3400 (curve shape constant) I = input current (in amps) D = –0.2840 (curve shape constant) Ipu = pickup current setpoint E = 4.0505 (curve shape constant)

SHIFTSCURVE

1 1 11.940 3.134 1.325 0.537 0.341 0.260 0.216 0.189 0.170 0.156 0.146 0. 116 0.102

0.5 1 5.970 1.567 0.663 0.268 0.171 0.130 0.108 0.094 0.085 0.078 0.073 0.058 0.051

0.8 1 9.552 2.507 1.060 0.430 0.273 0.208 0.173 0.151 0.136 0.125 0.117 0.093 0.082

1.1 1 13. 134 3.448 1.458 0.591 0.375 0.286 0.238 0.208 0.187 0.172 0.160 0.128 0.112

1.05 1.50 2.00 3. 00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

2 23.881 6. 268 2.650 1.074 0.682 0.520 0.432 0.378 0.340 0.312 0.291 0.232 0.204 3 35.821 9. 402 3.976 1.611 1.024 0.780 0.648 0.566 0.510 0.469 0.437 0.348 0.306 4 47.762 12.537 5.301 2.148 1.365 1.040 0.864 0.755 0.680 0.625 0.583 0.464 0.408 5 59.702 15.671 6.626 2.685 1.706 1.299 1.081 0.944 0.850 0.781 0.728 0.580 0.510 6 71.642 18.805 7.951 3.221 2.047 1.559 1.297 1.133 1.020 0.937 0.874 0.696 0.612 7 83.583 21.939 9.276 3.758 2.388 1.819 1.513 1.321 1.190 1.093 1.020 0.812 0.714 8 95.523 25.073 10.602 4.295 2.730 2.079 1.729 1.510 1.360 1.250 1.165 0.928 0.815 9 107.464 28.207 11.927 4.832 3.071 2.339 1.945 1.699 1.530 1.406 1.311 1.044 0.917

10 119.404 31.341 13.252 5.369 3.412 2.599 2.161 1.888 1.700 1.562 1.457 1.160 1.019

2 11.940 3.134 1.325 0.537 0.341 0.260 0.216 0.189 0.170 0.156 0.146 0.116 0.102 3 17.911 4.701 1.988 0.805 0.512 0.390 0.324 0.283 0.255 0.234 0.218 0.174 0.153 4 23.881 6. 268 2.650 1.074 0.682 0.520 0.432 0.378 0.340 0.312 0.291 0.232 0.204 5 29.851 7. 835 3.313 1.342 0.853 0.650 0.540 0.472 0.425 0.391 0.364 0.290 0.255 6 35.821 9. 402 3.976 1.611 1.024 0.780 0.648 0.566 0.510 0.469 0.437 0.348 0.306 7 41.791 10.969 4.638 1.879 1.194 0.910 0.756 0.661 0.595 0.547 0.510 0.406 0.357 8 47.762 12.537 5.301 2.148 1.365 1.040 0.864 0.755 0.680 0.625 0.583 0.464 0.408 9 53.732 14.104 5.963 2.416 1.535 1.169 0.973 0.849 0.765 0.703 0.655 0.522 0.459

10 59.702 15.671 6.626 2.685 1.706 1.299 1.081 0.944 0.850 0.781 0.728 0.580 0.510

2 19.105 5. 015 2.120 0.859 0.546 0.416 0.346 0.302 0.272 0.250 0.233 0.186 0.163 3 28.657 7. 522 3.180 1.289 0.819 0.624 0.519 0.453 0.408 0.375 0.350 0.278 0.245 4 38.209 10.029 4.241 1.718 1.092 0.832 0.692 0.604 0.544 0.500 0.466 0.371 0.326 5 47.762 12.537 5.301 2.148 1.365 1.040 0.864 0.755 0.680 0.625 0.583 0.464 0.408 6 57.314 15.044 6.361 2.577 1.638 1.247 1.037 0.906 0.816 0.750 0.699 0.557 0.489 7 66.866 17.551 7.421 3.007 1.911 1.455 1.210 1.057 0.952 0.875 0.816 0.649 0.571 8 76.418 20.058 8.481 3.436 2.184 1.663 1.383 1.208 1.088 1.000 0.932 0.742 0.652 9 85.971 22.566 9.541 3.866 2.457 1.871 1.556 1.359 1.224 1.125 1.049 0.835 0.734

10 95.523 25.073 10.602 4.295 2.730 2.079 1.729 1.510 1.360 1.250 1.165 0.928 0.815

2 26.269 6. 895 2.915 1.181 0.751 0.572 0.475 0.415 0.374 0.344 0.320 0.255 0.224 3 39.403 10.343 4.373 1.772 1.126 0.858 0.713 0.623 0.561 0.515 0.481 0.383 0.336 4 52.538 13.790 5.831 2.362 1.501 1.144 0.951 0.831 0.748 0.687 0.641 0.510 0.449 5 65.672 17.238 7.289 2.953 1.877 1.429 1.189 1.038 0.935 0.859 0.801 0.638 0.561 6 78.807 20.685 8.746 3.544 2.252 1.715 1.426 1.246 1.122 1.031 0.961 0.765 0.673 7 91.941 24.133 10.204 4.134 2.627 2.001 1.664 1.453 1.309 1.203 1.122 0.893 0.785 8 105.075 27.580 11.662 4.725 3.003 2.287 1.902 1.661 1.496 1.375 1.282 1.020 0.897 9 118.210 31.028 13.119 5.315 3.378 2.573 2.140 1.869 1.683 1.546 1.442 1.148 1.009

10 131.344 34.475 14.577 5.906 3.753 2.859 2.377 2.076 1.870 1.718 1.602 1.276 1.121

CURRENT (per unit I /I0)

---------------------------------- -

⁄()

()

–

5-6 735/737 Feeder Protection Relay

GE Power Management

Page 69

5 OVERCURRENT CURVES 5.2 ANSI CURVES

735/737 ANSI

1000

100

GE POWER MANAGEMENT

VERY INVERSE CURVE

TIME MULTIPLIER

TIME IN SECONDS

0.1

0.01

0.01 0.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–3: ANSI VERY INVERSE CURVES

9 8 7

6 5

803660A4.CDR

GE Power Management

735/737 Feeder Protection Relay 5-7

Page 70

5.2 ANSI CURVES 5 OVERCURRENT CURVES

5.2.4 ANSI EXTREMELY INVERSE CURVES

The trip time is given by:



TSMA

××

 

++ +

--------------------------- -

⁄()

–

---------------------------------- -

⁄()

()

–

where: T = trip time (in seconds) A = 0.0399 (curve shape constant)

S = curve shift multiplier B = 0.2294 (curve shape constant) M = 735/737 curve multiplier setpoint C = 0.5000 (curve shape constant) I = input current (in amps) D = 3.0094 (curve shape constant) Ipu = pickup current setpoint E = 0.7222 (curve shape constant)

SHIFTSCURVE

1 1 14.746 4.001 1.744 0.659 0.368 0.247 0.185 0.149 0.126 0.110 0.098 0.070 0.060

0.5 1 7.373 2.000 0.872 0.330 0.184 0.124 0.093 0.075 0.063 0.055 0.049 0.035 0.030

0.8 1 11.797 3.201 1.395 0.528 0.294 0.198 0.148 0.119 0.101 0.088 0.079 0.056 0.048

1.1 1 16. 221 4.401 1.919 0.725 0.405 0.272 0.204 0.164 0.138 0.121 0.108 0.077 0.066

1.05 1.50 2.00 3. 00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

2 29.492 8. 002 3.489 1.319 0.736 0.495 0.371 0.298 0.251 0.219 0.196 0.141 0.119 3 44.239 12.003 5.233 1.978 1.104 0.742 0.556 0.447 0.377 0.329 0.295 0.211 0.179 4 58.985 16.004 6.977 2.638 1.472 0.990 0.742 0.596 0.503 0.439 0.393 0.281 0.239 5 73.731 20.005 8.722 3.297 1.840 1.237 0.927 0.745 0.628 0.549 0.491 0.351 0.298 6 88.477 24.005 10.466 3.956 2.208 1.484 1.113 0.894 0.754 0.658 0.589 0.422 0.358 7 103.224 28.006 12.210 4.616 2.576 1.732 1.298 1.043 0.880 0.768 0.688 0.492 0.418 8 117.970 32.007 13.955 5.275 2.944 1.979 1.483 1.192 1.006 0.878 0.786 0.562 0.477 9 132.716 36.008 15.699 5.934 3.312 2.227 1.669 1.341 1.131 0.987 0.884 0.632 0.537

10 147.462 40.009 17.443 6.594 3.680 2.474 1.854 1.491 1.257 1.097 0.982 0.703 0.597

2 14.746 4. 001 1.744 0.659 0.368 0.247 0.185 0.149 0.126 0.110 0.098 0.070 0.060 3 22.119 6.001 2.616 0.989 0.552 0.371 0.278 0.224 0.189 0.165 0.147 0.105 0.090 4 29.492 8. 002 3.489 1.319 0.736 0.495 0.371 0.298 0.251 0.219 0.196 0.141 0.119 5 36.866 10.002 4.361 1.648 0.920 0.619 0.464 0.373 0.314 0.274 0.246 0.176 0.149 6 44.239 12.003 5.233 1.978 1.104 0.742 0.556 0.447 0.377 0.329 0.295 0.211 0.179 7 51.612 14.003 6.105 2.308 1.288 0.866 0.649 0.522 0.440 0.384 0.344 0.246 0.209 8 58.985 16.004 6.977 2.638 1.472 0.990 0.742 0.596 0.503 0.439 0.393 0.281 0.239 9 66.358 18.004 7.849 2.967 1.656 1.113 0.834 0.671 0.566 0.494 0.442 0.316 0.269

10 73.731 20.005 8.722 3.297 1.840 1.237 0.927 0.745 0.628 0.549 0.491 0.351 0.298

2 23.594 6. 401 2.791 1.055 0.589 0.396 0.297 0.238 0.201 0.176 0.157 0.112 0.095 3 35.391 9. 602 4.186 1.583 0.883 0.594 0.445 0.358 0.302 0.263 0.236 0.169 0.143 4 47.188 12.803 5.582 2.110 1.177 0.792 0.593 0.477 0.402 0.351 0.314 0.225 0.191 5 58.985 16.004 6.977 2.638 1.472 0.990 0.742 0.596 0.503 0.439 0.393 0.281 0.239 6 70.782 19.204 8.373 3.165 1.766 1.188 0.890 0.715 0.603 0.527 0.472 0.337 0.286 7 82.579 22.405 9.768 3.693 2.061 1.386 1.038 0.835 0.704 0.614 0.550 0.394 0.334 8 94.376 25.606 11.164 4.220 2 .355 1.583 1.187 0.954 0.804 0.702 0.629 0.450 0.382 9 106.173 28.806 12.559 4.748 2.649 1.781 1.335 1.073 0.905 0.790 0.707 0.506 0.430

10 117.970 32.007 13.955 5.275 2.944 1.979 1.483 1.192 1.006 0.878 0.786 0.562 0.477

2 32.442 8. 802 3.838 1.451 0.809 0.544 0.408 0.328 0.277 0.241 0.216 0.155 0.131 3 48.663 13.203 5.756 2.176 1.214 0.816 0.612 0.492 0.415 0.362 0.324 0.232 0.197 4 64.883 17.604 7.675 2.901 1.619 1.089 0.816 0.656 0.553 0.483 0.432 0.309 0.263 5 81.104 22.005 9.594 3.627 2.024 1.361 1.020 0.820 0.691 0.603 0.540 0.386 0.328 6 97.325 26.406 11.513 4.352 2 .428 1.633 1.224 0.984 0.830 0.724 0.648 0.464 0.394 7 113.546 30.807 13.431 5.077 2.833 1.905 1.428 1.148 0.968 0.845 0.756 0.541 0.460 8 129.767 35.208 15.350 5.803 3.238 2.177 1.632 1.312 1.106 0.966 0.864 0.618 0.525 9 145.988 39.609 17.269 6.528 3.643 2.449 1.836 1.476 1.244 1.086 0.973 0.696 0.591

10 162.208 44.010 19.188 7.253 4.047 2.722 2.040 1.640 1.383 1.207 1.081 0.773 0.656

CURRENT (per unit I /I0)

---------------------------------- -

⁄()

()

–

5-8 735/737 Feeder Protection Relay

GE Power Management

Page 71

5 OVERCURRENT CURVES 5.2 ANSI CURVES

735/737 ANSI

GE POWER MANAGEMENT

1000

100

EXTREMELY INVERSE CURVE

TIME IN SECONDS

0.1

TIME MULTIPLIER

9 8 7

6 5

0.01

GE Power Management

0.10.01

110

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–4: ANSI EXTREMELY INVERSE CURVES

735/737 Feeder Protection Relay 5-9

100

803661A4.CDR

Page 72

5.3 DEFINITE TIME CURVES 5 OVERCURRENT CURVES

5.3 DEFINITE TIME CURVES 5.3.1 DESCRIPTION

The trip time is given by: where: T = trip time (in seconds)

S = curve shift multiplier M = 735/737 curve multiplier setpoint I = input current (in amps) Ipu = pickup current setpoint

SHIFTSCURVE

1 1 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100

2 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 3 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 4 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 5 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 6 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 7 0.700 0.700 0.700 0.700 0.700 0.700 0.700 0.700 0.700 0.700 0.700 0.700 0.700 8 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 9 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900

10 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000

0.5 1 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 2 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 0.100 3 0.150 0.150 0.150 0.150 0.150 0.150 0.150 0.150 0.150 0.150 0.150 0.150 0.150

0.8 1 0.080 0.080 0.080 0.080 0.080 0.080 0.080 0.080 0.080 0.080 0.080 0.080 0.080

1.1 1 0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.110 0.110

4 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 5 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 6 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 0.300 7 0.350 0.350 0.350 0.350 0.350 0.350 0.350 0.350 0.350 0.350 0.350 0.350 0.350 8 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 9 0.450 0.450 0.450 0.450 0.450 0.450 0.450 0.450 0.450 0.450 0.450 0.450 0.450

10 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500

2 0.160 0.160 0.160 0.160 0.160 0.160 0.160 0.160 0.160 0.160 0.160 0.160 0.160 3 0.240 0.240 0.240 0.240 0.240 0.240 0.240 0.240 0.240 0.240 0.240 0.240 0.240 4 0.320 0.320 0.320 0.320 0.320 0.320 0.320 0.320 0.320 0.320 0.320 0.320 0.320 5 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 6 0.480 0.480 0.480 0.480 0.480 0.480 0.480 0.480 0.480 0.480 0.480 0.480 0.480 7 0.560 0.560 0.560 0.560 0.560 0.560 0.560 0.560 0.560 0.560 0.560 0.560 0.560 8 0.640 0.640 0.640 0.640 0.640 0.640 0.640 0.640 0.640 0.640 0.640 0.640 0.640 9 0.720 0.720 0.720 0.720 0.720 0.720 0.720 0.720 0.720 0.720 0.720 0.720 0.720

10 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800 0.800

2 0.220 0.220 0.220 0.220 0.220 0.220 0.220 0.220 0.220 0.220 0.220 0.220 0.220 3 0.330 0.330 0.330 0.330 0.330 0.330 0.330 0.330 0.330 0.330 0.330 0.330 0.330 4 0.440 0.440 0.440 0.440 0.440 0.440 0.440 0.440 0.440 0.440 0.440 0.440 0.440 5 0.550 0.550 0.550 0.550 0.550 0.550 0.550 0.550 0.550 0.550 0.550 0.550 0.550 6 0.660 0.660 0.660 0.660 0.660 0.660 0.660 0.660 0.660 0.660 0.660 0.660 0.660 7 0.770 0.770 0.770 0.770 0.770 0.770 0.770 0.770 0.770 0.770 0.770 0.770 0.770 8 0.880 0.880 0.880 0.880 0.880 0.880 0.880 0.880 0.880 0.880 0.880 0.880 0.880 9 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990 0.990

10 1.100 1.100 1.100 1.100 1.100 1.100 1.100 1.100 1.100 1.100 1.100 1.100 1.100

TSM

1.05 1.50 2.00 3. 00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

××

0.1

CURRENT (per unit I /I0)

5-10 735/737 Feeder Protection Relay

GE Power Management

Page 73

5 OVERCURRENT CURVES 5.3 DEFINITE TIME CURVES

735/737

1000

100

GE POWER MANAGEMENT

DEFINITE TIME CURVES

TIME MULTIPLIER

TIME IN SECONDS

0.1

0.01

0.01 0.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–5: DEFINITE TIME CURVES

9 8 7

803650A4.CDR

GE Power Management

735/737 Feeder Protection Relay 5-11

Page 74

5.4 IAC CURVES 5 OVERCURRENT CURVES

5.4 IAC CURVES 5.4.1 IAC SHORT INVERSE CURVES

The trip time is given by:



TSMA

××

 

++ +

--------------------------- -

⁄()

–

---------------------------------- -

⁄()

()

–

where: T = trip time (in seconds) A = 0.043 (curve shape constant)

S = curve shift multiplier B = 0.061 (curve shape constant) M = 735/737 curve multiplier setpoint C = 0.620 (curve shape constant) I = input current (in amps) D = –0.001 (curve shape constant) Ipu = pickup current setpoint E = 0.022 (curve shape constant)

SHIFTSCURVE

1 1 0.457 0.143 0.095 0.070 0.061 0.057 0.054 0.052 0.051 0.050 0.049 0.047 0.046

0.5 1 0.228 0.072 0.047 0.035 0.031 0.028 0.027 0.026 0.026 0.025 0.025 0.024 0.023

0.8 1 0.366 0.115 0.076 0.056 0.049 0.046 0.043 0.042 0.041 0.040 0.039 0.038 0.037

1.1 1 0.503 0.157 0.104 0.077 0.067 0.063 0.060 0.058 0.056 0.055 0.054 0.052 0.051

1.05 1.50 2.00 3. 00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

2 0.914 0.286 0.190 0.140 0.123 0.114 0.108 0.105 0.102 0.100 0.099 0.094 0.092 3 1.371 0.429 0.284 0.210 0.184 0.171 0.163 0.157 0.153 0.150 0.148 0.141 0.138 4 1.828 0.573 0.379 0.279 0.245 0.228 0.217 0.210 0.204 0.200 0.197 0.188 0.184 5 2.285 0.716 0.474 0.349 0.307 0.285 0.271 0.262 0.255 0.250 0.247 0.235 0.230 6 2.742 0.859 0.569 0.419 0.368 0.341 0.325 0.314 0.307 0.301 0.296 0.282 0.276 7 3.199 1.002 0.664 0.489 0.429 0.398 0.380 0.367 0.358 0.351 0.345 0.329 0.322 8 3.656 1.145 0.759 0.559 0.490 0.455 0.434 0.419 0.409 0.401 0.394 0.376 0.368 9 4.113 1.288 0.853 0.629 0.552 0.512 0.488 0.472 0.460 0.451 0.444 0.423 0.413

10 4.570 1.431 0.948 0.699 0.613 0.569 0.542 0.524 0.511 0.501 0.493 0.470 0.459

2 0.457 0.143 0.095 0.070 0.061 0.057 0.054 0.052 0.051 0.050 0.049 0.047 0.046 3 0.685 0.215 0.142 0.105 0.092 0.085 0.081 0.079 0.077 0.075 0.074 0.071 0.069 4 0.914 0.286 0.190 0.140 0.123 0.114 0.108 0.105 0.102 0.100 0.099 0.094 0.092 5 1.142 0.358 0.237 0.175 0.153 0.142 0.136 0.131 0.128 0.125 0.123 0.118 0.115 6 1.371 0.429 0.284 0.210 0.184 0.171 0.163 0.157 0.153 0.150 0.148 0.141 0.138 7 1.599 0.501 0.332 0.244 0.215 0.199 0.190 0.183 0.179 0.175 0.173 0.165 0.161 8 1.828 0.573 0.379 0.279 0.245 0.228 0.217 0.210 0.204 0.200 0.197 0.188 0.184 9 2.056 0.644 0.427 0.314 0.276 0.256 0.244 0.236 0.230 0.225 0.222 0.212 0.207

10 2.285 0.716 0.474 0.349 0.307 0.285 0.271 0.262 0.255 0.250 0.247 0.235 0.230

2 0.731 0.229 0.152 0.112 0.098 0.091 0.087 0.084 0.082 0.080 0.079 0.075 0.074 3 1.097 0.344 0.228 0.168 0.147 0.137 0.130 0.126 0.123 0.120 0.118 0.113 0.110 4 1.462 0.458 0.303 0.224 0.196 0.182 0.174 0.168 0.163 0.160 0.158 0.151 0.147 5 1.828 0.573 0.379 0.279 0.245 0.228 0.217 0.210 0.204 0.200 0.197 0.188 0.184 6 2.194 0.687 0.455 0.335 0.294 0.273 0.260 0.252 0.245 0.240 0.237 0.226 0.221 7 2.559 0.802 0.531 0.391 0.343 0.319 0.304 0.293 0.286 0.281 0.276 0.263 0.257 8 2.925 0.916 0.607 0.447 0.392 0.364 0.347 0.335 0.327 0.321 0.316 0.301 0.294 9 3.290 1.031 0.683 0.503 0.441 0.410 0.390 0.377 0.368 0.361 0.355 0.339 0.331

10 3.656 1.145 0.759 0.559 0.490 0.455 0.434 0.419 0.409 0.401 0.394 0.376 0.368

2 1.005 0.315 0.209 0.154 0.135 0.125 0.119 0.115 0.112 0.110 0.108 0.103 0.101 3 1.508 0.472 0.313 0.231 0.202 0.188 0.179 0.173 0.169 0.165 0.163 0.155 0.152 4 2.011 0.630 0.417 0.307 0.270 0.250 0.239 0.231 0.225 0.220 0.217 0.207 0.202 5 2.513 0.787 0.521 0.384 0.337 0.313 0.298 0.288 0.281 0.275 0.271 0.259 0.253 6 3.016 0.945 0.626 0.461 0.405 0.376 0.358 0.346 0.337 0.331 0.325 0.310 0.303 7 3.519 1.102 0.730 0.538 0.472 0.438 0.418 0.404 0.393 0.386 0.380 0.362 0.354 8 4.021 1.260 0.834 0.615 0.539 0.501 0.477 0.461 0.450 0.441 0.434 0.414 0.404 9 4.524 1.417 0.939 0.692 0.607 0.563 0.537 0.519 0.506 0.496 0.488 0.466 0.455

10 5.027 1.575 1.043 0.768 0.674 0.626 0.596 0.576 0.562 0.551 0.542 0.517 0.505

CURRENT (per unit I /I0)

---------------------------------- -

⁄()

()

–

5-12 735/737 Feeder Protection Relay

GE Power Management

Page 75

5 OVERCURRENT CURVES 5.4 IAC CURVES

735/737 IAC

GE POWER MANAGEMENT

SHORT INVERSE CURVE

TIME IN SECONDS

0.1

0.01

0.1

CURVE MULTIPLIER

9 8 7

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–6: IAC SHORT INVERSE CURVES

803655A4.CDR

GE Power Management

735/737 Feeder Protection Relay 5-13

Page 76

5.4 IAC CURVES 5 OVERCURRENT CURVES

5.4.2 IAC INVERSE CURVES

The trip time is given by:



TSMA

××

 

++ +

--------------------------- -

⁄()

–

---------------------------------- -

⁄()

()

–

where: T = trip time (in seconds) A = 0.2078 (curve shape constant)

S = curve shift multiplier B = 0.8630 (curve shape constant) M = 735/737 curve multiplier setpoint C = 0.8000 (curve shape constant) I = input current (in amps) D = –0.4180 (curve shape constant) Ipu = pickup current setpoint E = 0.1947 (curve shape constant)

SHIFTSCURVE

1 1 9.433 1.155 0.749 0.532 0.443 0.392 0.360 0.337 0.320 0.307 0.297 0.267 0.252

0.5 1 4.716 0.578 0.375 0.266 0.221 0.196 0.180 0.168 0.160 0.154 0.148 0.133 0.126

0.8 1 7.546 0.924 0.599 0.426 0.354 0.314 0.288 0.270 0.256 0.246 0.238 0.213 0.201

1.1 1 10. 376 1.271 0.824 0.585 0.487 0.431 0.396 0.371 0.352 0.338 0.327 0.293 0.277

1.05 1.50 2.00 3. 00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

2 18.865 2. 310 1.499 1.064 0.885 0.784 0.719 0.674 0.640 0.614 0.594 0.533 0.503 3 28.298 3. 466 2.248 1.596 1.328 1.177 1.079 1.011 0.960 0.922 0.891 0.800 0.755 4 37.730 4. 621 2.997 2.128 1.770 1.569 1.439 1.348 1.280 1.229 1.188 1.066 1.007 5 47.163 5. 776 3.747 2.660 2.213 1.961 1.798 1.685 1.601 1.536 1.485 1.333 1.258 6 56.596 6. 931 4.496 3.192 2.656 2.353 2.158 2.022 1.921 1.843 1.781 1.599 1.510 7 66.028 8. 087 5.246 3.724 3.098 2.745 2.518 2.359 2.241 2.150 2.078 1.866 1.761 8 75.461 9. 242 5.995 4.256 3.541 3.138 2.878 2.695 2.561 2.457 2.375 2.133 2.013 9 84.893 10.397 6.744 4.788 3.983 3.530 3.237 3.032 2.881 2.765 2.672 2.399 2.265

10 94.326 11.552 7.494 5.320 4.426 3.922 3.597 3.369 3.201 3.072 2.969 2.666 2.516

2 9.433 1.155 0.749 0.532 0.443 0.392 0.360 0.337 0.320 0.307 0.297 0.267 0.252 3 14.149 1. 733 1.124 0.798 0.664 0.588 0.540 0.505 0.480 0.461 0.445 0.400 0.377 4 18.865 2. 310 1.499 1.064 0.885 0.784 0.719 0.674 0.640 0.614 0.594 0.533 0.503 5 23.582 2. 888 1.873 1.330 1.107 0.981 0.899 0.842 0.800 0.768 0.742 0.666 0.629 6 28.298 3. 466 2.248 1.596 1.328 1.177 1.079 1.011 0.960 0.922 0.891 0.800 0.755 7 33.014 4. 043 2.623 1.862 1.549 1.373 1.259 1.179 1.120 1.075 1.039 0.933 0.881 8 37.730 4. 621 2.997 2.128 1.770 1.569 1.439 1.348 1.280 1.229 1.188 1.066 1.007 9 42.447 5. 199 3.372 2.394 1.992 1.765 1.619 1.516 1.441 1.382 1.336 1.200 1.132

10 47.163 5.776 3.747 2.660 2.213 1.961 1.798 1.685 1.601 1.536 1.485 1.333 1.258

2 15.092 1. 848 1.199 0.851 0.708 0.628 0.576 0.539 0.512 0.491 0.475 0.427 0.403 3 22.638 2. 773 1.798 1.277 1.062 0.941 0.863 0.809 0.768 0.737 0.713 0.640 0.604 4 30.184 3. 697 2.398 1.702 1.416 1.255 1.151 1.078 1.024 0.983 0.950 0.853 0.805 5 37.730 4. 621 2.997 2.128 1.770 1.569 1.439 1.348 1.280 1.229 1.188 1.066 1.007 6 45.276 5. 545 3.597 2.554 2.125 1.883 1.727 1.617 1.537 1.474 1.425 1.280 1.208 7 52.823 6. 469 4.196 2.979 2.479 2.196 2.014 1.887 1.793 1.720 1.663 1.493 1.409 8 60.369 7. 394 4.796 3.405 2.833 2.510 2.302 2.156 2.049 1.966 1.900 1.706 1.611 9 67.915 8. 318 5.395 3.830 3.187 2.824 2.590 2.426 2.305 2.212 2.138 1.919 1.812

10 75.461 9.242 5.995 4.256 3.541 3.138 2.878 2.695 2.561 2.457 2.375 2.133 2.013

2 20.752 2. 542 1.649 1.170 0.974 0.863 0.791 0.741 0.704 0.676 0.653 0.586 0.554 3 31.128 3. 812 2.473 1.756 1.461 1.294 1.187 1.112 1.056 1.014 0.980 0.880 0.830 4 41.503 5. 083 3.297 2.341 1.947 1.726 1.583 1.483 1.409 1.352 1.306 1.173 1.107 5 51.879 6. 354 4.121 2.926 2.434 2.157 1.978 1.853 1.761 1.689 1.633 1.466 1.384 6 62.255 7. 625 4.946 3.511 2.921 2.589 2.374 2.224 2.113 2.027 1.960 1.759 1.661 7 72.631 8. 895 5.770 4.096 3.408 3.020 2.770 2.594 2.465 2.365 2.286 2.053 1.938 8 83.007 10.166 6.594 4.682 3.895 3.451 3.165 2.965 2.817 2.703 2.613 2.346 2.214 9 93.383 11.437 7.419 5.267 4.382 3.883 3.561 3.336 3.169 3.041 2.939 2.639 2.491

10 103.759 12.708 8.243 5.852 4.869 4.314 3.957 3.706 3.521 3.379 3.266 2.932 2.768

CURRENT (per unit I /I0)

---------------------------------- -

⁄()

()

–

5-14 735/737 Feeder Protection Relay

GE Power Management

Page 77

5 OVERCURRENT CURVES 5.4 IAC CURVES

735/737 IAC

GE POWER MANAGEMENT

1000

100

INVERSE CURVE

TIME IN SECONDS

CURVE MULTIPLIERCURVE MULTIPLIER

9 8 7

6 5

GE Power Management

0.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–7: IAC INVERSE CURVES

735/737 Feeder Protection Relay 5-15

803659A4.CDR

Page 78

5.4 IAC CURVES 5 OVERCURRENT CURVES

5.4.3 IAC VERY INVERSE CURVES

The trip time is given by:



TSMA

××

 

++ +

--------------------------- -

⁄()

–

---------------------------------- -

⁄()

()

–

where: T = trip time (in seconds) A = 0.090 (curve shape constant)

S = curve shift multiplier B = 0.796 (curve shape constant) M = 735/737 curve multiplier setpoint C = 0.100 (curve shape constant) I = input current (in amps) D = –1.289 (curve shape constant) Ipu = pickup current setpoint E = 7.959 (curve shape constant)

SHIFTSCURVE

1 1 8.782 2.901 1.312 0.537 0.343 0.266 0.227 0.202 0.186 0.174 0.165 0.140 0.128

0.5 1 4.391 1.451 0.656 0.269 0.172 0.133 0.113 0.101 0.093 0.087 0.083 0.070 0.064

0.8 1 7.026 2.321 1.050 0.430 0.275 0.213 0.181 0.162 0.149 0.140 0.132 0.112 0.102

1.1 1 9.660 3.191 1.443 0.591 0.378 0.293 0.249 0.223 0.205 0.192 0.182 0.154 0.141

1.05 1.50 2.00 3. 00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

2 17.564 5. 802 2.624 1.075 0.687 0.533 0.453 0.405 0.372 0.349 0.331 0.280 0.255 3 26.347 8. 704 3.936 1.612 1.030 0.799 0.680 0.607 0.559 0.523 0.496 0.420 0.383 4 35.129 11.605 5.248 2.150 1.374 1.065 0.906 0.810 0.745 0.698 0.662 0.560 0.511 5 43.911 14.506 6.560 2.687 1.717 1.332 1.133 1.012 0.931 0.872 0.827 0.700 0.639 6 52.693 17.407 7.872 3.225 2.061 1.598 1.359 1.215 1.117 1.046 0.992 0.840 0.766 7 61.475 20.308 9.185 3.762 2.404 1.864 1.586 1.417 1.303 1.221 1.158 0.980 0.894 8 70.257 23.209 10.497 4.299 2.747 2.131 1.813 1.620 1.490 1.395 1.323 1.120 1.022 9 79.040 26.111 11.809 4.837 3.091 2.397 2.039 1.822 1.676 1.570 1.489 1.260 1.150

10 87.822 29.012 13.121 5.374 3.434 2.663 2.266 2.025 1.862 1.744 1.654 1.400 1.277

2 8.782 2.901 1.312 0.537 0.343 0.266 0.227 0.202 0.186 0.174 0.165 0.140 0.128 3 13.173 4. 352 1.968 0.806 0.515 0.399 0.340 0.304 0.279 0.262 0.248 0.210 0.192 4 17.564 5. 802 2.624 1.075 0.687 0.533 0.453 0.405 0.372 0.349 0.331 0.280 0.255 5 21.955 7. 253 3.280 1.344 0.859 0.666 0.566 0.506 0.465 0.436 0.414 0.350 0.319 6 26.347 8. 704 3.936 1.612 1.030 0.799 0.680 0.607 0.559 0.523 0.496 0.420 0.383 7 30.738 10.154 4.592 1.881 1.202 0.932 0.793 0.709 0.652 0.610 0.579 0.490 0.447 8 35.129 11.605 5.248 2.150 1.374 1.065 0.906 0.810 0.745 0.698 0.662 0.560 0.511 9 39.520 13.055 5.904 2.418 1.545 1.198 1.020 0.911 0.838 0.785 0.744 0.630 0.575

10 43.911 14.506 6.560 2.687 1.717 1.332 1.133 1.012 0.931 0.872 0.827 0.700 0.639

2 14.051 4. 642 2.099 0.860 0.549 0.426 0.363 0.324 0.298 0.279 0.265 0.224 0.204 3 21.077 6. 963 3.149 1.290 0.824 0.639 0.544 0.486 0.447 0.419 0.397 0.336 0.307 4 28.103 9. 284 4.199 1.720 1.099 0.852 0.725 0.648 0.596 0.558 0.529 0.448 0.409 5 35.129 11.605 5.248 2.150 1.374 1.065 0.906 0.810 0.745 0.698 0.662 0.560 0.511 6 42.154 13.926 6.298 2.580 1.648 1.278 1.088 0.972 0.894 0.837 0.794 0.672 0.613 7 49.180 16.247 7.348 3.010 1.923 1.491 1.269 1.134 1.043 0.977 0.926 0.784 0.715 8 56.206 18.568 8.397 3.439 2.198 1.705 1.450 1.296 1.192 1.116 1.059 0.896 0.817 9 63.232 20.889 9.447 3.869 2.473 1.918 1.631 1.458 1.341 1.256 1.191 1.008 0.920

10 70.257 23.209 10.497 4.299 2.747 2.131 1.813 1.620 1.490 1.395 1.323 1.120 1.022

2 19.321 6. 383 2.887 1.182 0.756 0.586 0.498 0.445 0.410 0.384 0.364 0.308 0.281 3 28.981 9. 574 4.330 1.773 1.133 0.879 0.748 0.668 0.614 0.576 0.546 0.462 0.422 4 38.642 12.765 5.773 2.365 1.511 1.172 0.997 0.891 0.819 0.767 0.728 0.616 0.562 5 48.302 15.956 7.216 2.956 1.889 1.465 1.246 1.113 1.024 0.959 0.910 0.770 0.703 6 57.962 19.148 8.660 3.547 2.267 1.758 1.495 1.336 1.229 1.151 1.092 0.924 0.843 7 67.623 22.339 10.103 4.138 2.644 2.051 1.745 1.559 1.434 1.343 1.274 1.078 0.984 8 77.283 25.530 11.546 4.729 3 .022 2.344 1.994 1.782 1.638 1.535 1.456 1.232 1.124 9 86.944 28.722 12.990 5.320 3.400 2.637 2.243 2.004 1.843 1.727 1.638 1.386 1.265

10 96.604 31.913 14.433 5.912 3.778 2.930 2.492 2.227 2.048 1.918 1.820 1.540 1.405

CURRENT (per unit I /I0)

---------------------------------- -

⁄()

()

–

5-16 735/737 Feeder Protection Relay

GE Power Management

Page 79

5 OVERCURRENT CURVES 5.4 IAC CURVES

735/737 IAC

GE POWER MANAGEMENT

1000

100

VERY INVERSE CURVE

TIME IN SECONDS

0.1

CURVE MULTIPLIER

10 9 8

7 6

5 4

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–8: IAC VERY INVERSE CURVES

803657A4.CDR

GE Power Management

735/737 Feeder Protection Relay 5-17

Page 80

5.4 IAC CURVES 5 OVERCURRENT CURVES

5.4.4 IAC EXTREMELY INVERSE CURVES

The trip time is given by:



TSMA

××

 

++ +

--------------------------- -

⁄()

–

---------------------------------- -

⁄()

()

–

where: T = trip time (in seconds) A = 0.004 (curve shape constant)

S = curve shift multiplier B = 0.638 (curve shape constant) M = 735/737 curve multiplier setpoint C = 0.620 (curve shape constant) I = input current (in amps) D = 1.787 (curve shape constant) Ipu = pickup current setpoint E = 0.246 (curve shape constant)

SHIFTSCURVE

1 1 14.249 3.398 1.498 0.606 0.356 0.246 0.186 0.149 0.124 0.106 0.093 0.057 0.042

0.5 1 7.124 1.699 0.749 0.303 0.178 0.123 0.093 0.074 0.062 0.053 0.046 0.029 0.021

0.8 1 11.399 2.718 1.199 0.485 0.284 0.197 0.149 0.119 0.099 0.085 0.074 0.046 0.033

1.1 1 15. 673 3.738 1.648 0.666 0.391 0.270 0.204 0.164 0.136 0.117 0.102 0.063 0.046

1.05 1.50 2.00 3. 00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

2 28.497 6. 796 2.997 1.212 0.711 0.491 0.372 0.298 0.248 0.212 0.185 0.114 0.083 3 42.746 10.194 4.495 1.817 1.067 0.737 0.558 0.447 0.372 0.318 0.278 0.171 0.125 4 56.994 13.591 5.993 2.423 1.422 0.983 0.744 0.595 0.495 0.424 0.370 0.228 0.167 5 71.243 16.989 7.492 3.029 1.778 1.229 0.929 0.744 0.619 0.530 0.463 0.285 0.209 6 85.491 20.387 8.990 3.635 2.133 1.474 1.115 0.893 0.743 0.636 0.556 0.343 0.250 7 99.740 23.785 10.488 4.241 2.489 1.720 1.301 1.042 0.867 0.742 0.648 0.400 0.292 8 113.989 27.183 11.987 4.846 2.844 1.966 1.487 1.191 0.991 0.848 0.741 0.457 0.334 9 128.237 30.581 13.485 5.452 3.200 2.212 1.673 1.340 1.115 0.954 0.834 0.514 0.375

10 142.486 33.979 14.983 6.058 3.555 2.457 1.859 1.488 1.239 1.060 0.926 0.571 0.417

2 14.249 3. 398 1.498 0.606 0.356 0.246 0.186 0.149 0.124 0.106 0.093 0.057 0.042 3 21.373 5. 097 2.248 0.909 0.533 0.369 0.279 0.223 0.186 0.159 0.139 0.086 0.063 4 28.497 6. 796 2.997 1.212 0.711 0.491 0.372 0.298 0.248 0.212 0.185 0.114 0.083 5 35.621 8. 495 3.746 1.514 0.889 0.614 0.465 0.372 0.310 0.265 0.232 0.143 0.104 6 42.746 10.194 4.495 1.817 1.067 0.737 0.558 0.447 0.372 0.318 0.278 0.171 0.125 7 49.870 11.893 5.244 2.120 1.244 0.860 0.651 0.521 0.434 0.371 0.324 0.200 0.146 8 56.994 13.591 5.993 2.423 1.422 0.983 0.744 0.595 0.495 0.424 0.370 0.228 0.167 9 64.119 15.290 6.743 2.726 1.600 1.106 0.837 0.670 0.557 0.477 0.417 0.257 0.188

10 71.243 16.989 7.492 3.029 1.778 1.229 0.929 0.744 0.619 0.530 0.463 0.285 0.209

2 22.798 5. 437 2.397 0.969 0.569 0.393 0.297 0.238 0.198 0.170 0.148 0.091 0.067 3 34.197 8. 155 3.596 1.454 0.853 0.590 0.446 0.357 0.297 0.254 0.222 0.137 0.100 4 45.595 10.873 4.795 1.939 1.138 0.786 0.595 0.476 0.396 0.339 0.296 0.183 0.133 5 56.994 13.591 5.993 2.423 1.422 0.983 0.744 0.595 0.495 0.424 0.370 0.228 0.167 6 68.393 16.310 7.192 2.908 1.707 1.179 0.892 0.714 0.595 0.509 0.445 0.274 0.200 7 79.792 19.028 8.391 3.392 1.991 1.376 1.041 0.833 0.694 0.594 0.519 0.320 0.234 8 91.191 21.746 9.589 3.877 2.275 1.573 1.190 0.953 0.793 0.678 0.593 0.365 0.267 9 102.590 24.465 10.788 4.362 2.560 1.769 1.338 1.072 0.892 0.763 0.667 0.411 0.300

10 113.989 27.183 11.987 4.846 2.844 1.966 1.487 1.191 0.991 0.848 0.741 0.457 0.334

2 31.347 7. 475 3.296 1.333 0.782 0.541 0.409 0.327 0.272 0.233 0.204 0.126 0.092 3 47.020 11.213 4.945 1.999 1.173 0.811 0.613 0.491 0.409 0.350 0.306 0.188 0.138 4 62.694 14.951 6.593 2.665 1.564 1.081 0.818 0.655 0.545 0.466 0.408 0.251 0.184 5 78.367 18.688 8.241 3.332 1.955 1.351 1.022 0.819 0.681 0.583 0.509 0.314 0.229 6 94.041 22.426 9.889 3.998 2.347 1.622 1.227 0.982 0.817 0.700 0.611 0.377 0.275 7 109.714 26.164 11.537 4.665 2.738 1.892 1.431 1.146 0.954 0.816 0.713 0.440 0.321 8 125.387 29.901 13.185 5.331 3.129 2.162 1.636 1.310 1.090 0.933 0.815 0.502 0.367 9 141.061 33.639 14.834 5.997 3.520 2.433 1.840 1.474 1.226 1.049 0.917 0.565 0.413

10 156.734 37.377 16.482 6.664 3.911 2.703 2.045 1.637 1.362 1.166 1.019 0.628 0.459

CURRENT (per unit I /I0)

---------------------------------- -

⁄()

()

–

5-18 735/737 Feeder Protection Relay

GE Power Management

Page 81

5 OVERCURRENT CURVES 5.4 IAC CURVES

735/737 IAC

GE POWER MANAGEMENT

1000

100

EXTREMELY INVERSE CURVE

TIME IN SECONDS

0.1

CURVE MULTIPLIER

9 8 7

6 5

0.01

GE Power Management

0.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–9: IAC EXTREMELY INVERSE CURVES

735/737 Feeder Protection Relay 5-19

803656A4.CDR

Page 82

5.5 IEC CURVES 5 OVERCURRENT CURVES

5.5 IEC CURVES 5.5.1 IEC SHORT TIME CURVES



The trip time is given by:

TSM

××

----------------------------- -

 

⁄()

–

where: T = trip time (in seconds) K = 0.050 (curve shape constant)

S = curve shift multiplier E = 0.040 (curve shape constant) M = 735/737 curve multiplier setpoint I = input current (in amps) Ipu = pickup current setpoint

S MUL T CURRENT (per unit I /I0) – values below calculated using the IEC M value

735 IEC 1.05 1.50 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

1 1 0.1 2.560 0.306 0.178 0.112 0.088 0.075 0.067 0.062 0.057 0.054 0.052 0.044 0.040

2 0.2 5.121 0.611 0.356 0.223 0.176 0.151 0.134 0.123 0.115 0.108 0.103 0.087 0.080 3 0.3 7.681 0.917 0.534 0.335 0.264 0.226 0.202 0.185 0.172 0.162 0.155 0.131 0.119 4 0.4 10.242 1.223 0.712 0.447 0.352 0.301 0.269 0.246 0.230 0.217 0.206 0.175 0.159 5 0.5 12.802 1.528 0.890 0.559 0.440 0.377 0.336 0.308 0.287 0.271 0.258 0.219 0.199 6 0.6 15.363 1.834 1.068 0.670 0.528 0.452 0.403 0.369 0.344 0.325 0.309 0.262 0.239 7 0.7 17.923 2.140 1.246 0.782 0.616 0.527 0.471 0.431 0.402 0.379 0.361 0.306 0.278 8 0.8 20.484 2.445 1.424 0.894 0.704 0.602 0.538 0.493 0.459 0.433 0.412 0.350 0.318 9 0.9 23.044 2.751 1.602 1.005 0.792 0.678 0.605 0.554 0.516 0.487 0.464 0.393 0.358

10 1.0 25.604 3.057 1.780 1.117 0.880 0.753 0.672 0.616 0.574 0.541 0.515 0.437 0.398

0.5 1 0.1 1.280 0.153 0.089 0.056 0.044 0.038 0.034 0.031 0.029 0.027 0.026 0.022 0.020 2 0.2 2.560 0.306 0.178 0.112 0.088 0.075 0.067 0.062 0.057 0.054 0.052 0.044 0.040 3 0.3 3.841 0.459 0.267 0.168 0.132 0.113 0.101 0.092 0.086 0.081 0.077 0.066 0.060 4 0.4 5.121 0.611 0.356 0.223 0.176 0.151 0.134 0.123 0.115 0.108 0.103 0.087 0.080 5 0.5 6.401 0.764 0.445 0.279 0.220 0.188 0.168 0.154 0.143 0.135 0.129 0.109 0.099 6 0.6 7.681 0.917 0.534 0.335 0.264 0.226 0.202 0.185 0.172 0.162 0.155 0.131 0.119 7 0.7 8.962 1.070 0.623 0.391 0.308 0.264 0.235 0.216 0.201 0.189 0.180 0.153 0.139 8 0.8 10.242 1.223 0.712 0.447 0.352 0.301 0.269 0.246 0.230 0.217 0.206 0.175 0.159 9 0.9 11.522 1.376 0.801 0.503 0.396 0.339 0.303 0.277 0.258 0.244 0.232 0.197 0.179

10 1.0 12.802 1.528 0.890 0.559 0.440 0.377 0.336 0.308 0.287 0.271 0.258 0.219 0.199

0.8 1 0.1 2.048 0.245 0.142 0.089 0.070 0.060 0.054 0.049 0.046 0.043 0.041 0.035 0.032 2 0.2 4.097 0.489 0.285 0.179 0.141 0.120 0.108 0.099 0.092 0.087 0.082 0.070 0.064 3 0.3 6.145 0.734 0.427 0.268 0.21 1 0.181 0.161 0.148 0.138 0.130 0.124 0.105 0.095 4 0.4 8.193 0.978 0.569 0.357 0.282 0.241 0.215 0.197 0.184 0.173 0.165 0.140 0.127 5 0.5 10.242 1.223 0.712 0.447 0.352 0.301 0.269 0.246 0.230 0.217 0.206 0.175 0.159 6 0.6 12.290 1.467 0.854 0.536 0.422 0.361 0.323 0.296 0.275 0.260 0.247 0.210 0.191 7 0.7 14.338 1.712 0.997 0.626 0.493 0.422 0.376 0.345 0.321 0.303 0.289 0.245 0.223 8 0.8 16.387 1.956 1.139 0.715 0.563 0.482 0.430 0.394 0.367 0.346 0.330 0.280 0.254 9 0.9 18.435 2.201 1.281 0.804 0.634 0.542 0.484 0.443 0.413 0.390 0.371 0.315 0.286

10 1.0 20.484 2.445 1.424 0.894 0.704 0.602 0.538 0.493 0.459 0.433 0.412 0.350 0.318

1.1 1 0.1 2.816 0.336 0.196 0.123 0.097 0.083 0.074 0.068 0.063 0.060 0.057 0.048 0.044 2 0.2 5.633 0.672 0.392 0.246 0.194 0.166 0.148 0.135 0.126 0.119 0.113 0.096 0.087 3 0.3 8.449 1.009 0.587 0.369 0.290 0.248 0.222 0.203 0.189 0.179 0.170 0.144 0.131 4 0.4 11.266 1.345 0.783 0.492 0.387 0.331 0.296 0.271 0.252 0.238 0.227 0.192 0.175 5 0.5 14.082 1.681 0.979 0.614 0.484 0.414 0.370 0.339 0.316 0.298 0.283 0.240 0.219 6 0.6 16.899 2.017 1.175 0.737 0.581 0.497 0.444 0.406 0.379 0.357 0.340 0.289 0.262 7 0.7 19.715 2.354 1.370 0.860 0.678 0.580 0.518 0.474 0.442 0.417 0.397 0.337 0.306 8 0.8 22.532 2.690 1.566 0.983 0.774 0.663 0.592 0.542 0.505 0.476 0.454 0.385 0.350 9 0.9 25.348 3.026 1.762 1.106 0.871 0.745 0.666 0.610 0.568 0.536 0.510 0.433 0.394

10 1.0 28.165 3.362 1.958 1.229 0.968 0.828 0.739 0.677 0.631 0.595 0.567 0.481 0.437

5-20 735/737 Feeder Protection Relay

GE Power Management

Page 83

5 OVERCURRENT CURVES 5.5 IEC CURVES

735/737 IEC SHORT TIME

GE POWER MANAGEMENT

1000

100

CURVE

CURVE MULTIPLIER

735 IEC FACEPLATE EQUIVALENT

TIME IN SECONDS

0.1

10 1.0

90.9

80.8

70.7

60.6

50.5

40.4

30.3

20.2

10.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–10: IEC SHORT TIME CURVES

803654A4.CDR

GE Power Management

735/737 Feeder Protection Relay 5-21

Page 84

5.5 IEC CURVES 5 OVERCURRENT CURVES



The trip time is given by:

TSM

××

----------------------------- -

 

⁄()

–

where: T = trip time (in seconds) K = 0.140 (curve shape constant)

S = curve shift multiplier E = 0.020 (curve shape constant) M = 735/737 curve multiplier setpoint I = input current (in amps) Ipu = pickup current setpoint

S MULT CURRENT (per unit I /I0)– values below calculated using the IEC M value

735 IEC 1.05 1.50 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

1 1 0.1 14.340 1.718 1.002 0.632 0.499 0.428 0.383 0.351 0.328 0.309 0.295 0.251 0.228

2 0.2 28.680 3.435 2.004 1.263 0.998 0.856 0.765 0.702 0.655 0.619 0.589 0.501 0.457 3 0.3 43.020 5.153 3.007 1.895 1.497 1.284 1.148 1.053 0.983 0.928 0.884 0.752 0.685 4 0.4 57.360 6.870 4.009 2.526 1.996 1.712 1.531 1.404 1.310 1.237 1.179 1.003 0.914 5 0.5 71.700 8.588 5.011 3.158 2.495 2.139 1.913 1.755 1.638 1.546 1.473 1.253 1.142 6 0.6 86.040 10.305 6.013 3.789 2.993 2.567 2.296 2.106 1.965 1.856 1.768 1.504 1.371 7 0.7 ##### 12.023 7.016 4.421 3.492 2.995 2.679 2.457 2.293 2.165 2.063 1.755 1.599 8 0.8 ##### 13.740 8.018 5.052 3.991 3.423 3.061 2.808 2.620 2.474 2.357 2.005 1.828 9 0.9 ##### 15.458 9.020 5.684 4.490 3.851 3.444 3.159 2.948 2.783 2.652 2.256 2.056

10 1.0 ##### 17.175 10.022 6.315 4.989 4.279 3.827 3.510 3.275 3.093 2.947 2.507 2.284

0.5 1 0.1 7.170 0.859 0.501 0.316 0.249 0.214 0.191 0.176 0.164 0.155 0.147 0.125 0.114 2 0.2 14.340 1.718 1.002 0.632 0.499 0.428 0.383 0.351 0.328 0.309 0.295 0.251 0.228 3 0.3 21.510 2.576 1.503 0.947 0.748 0.642 0.574 0.527 0.491 0.464 0.442 0.376 0.343 4 0.4 28.680 3.435 2.004 1.263 0.998 0.856 0.765 0.702 0.655 0.619 0.589 0.501 0.457 5 0.5 35.850 4.294 2.506 1.579 1.247 1.070 0.957 0.878 0.819 0.773 0.737 0.627 0.571 6 0.6 43.020 5.153 3.007 1.895 1.497 1.284 1.148 1.053 0.983 0.928 0.884 0.752 0.685 7 0.7 50.190 6.011 3.508 2.210 1.746 1.498 1.339 1.229 1.146 1.082 1.031 0.877 0.800 8 0.8 57.360 6.870 4.009 2.526 1.996 1.712 1.531 1.404 1.310 1.237 1.179 1.003 0.914 9 0.9 64.530 7.729 4.510 2.842 2.245 1.925 1.722 1.580 1.474 1.392 1.326 1.128 1.028

10 1.0 71.700 8.588 5.011 3.158 2.495 2.139 1.913 1.755 1.638 1.546 1.473 1.253 1.142

0.8 1 0.1 11.472 1.374 0.802 0.505 0.399 0.342 0.306 0.281 0.262 0.247 0.236 0.201 0.183 2 0.2 22.944 2.748 1.604 1.010 0.798 0.685 0.612 0.562 0.524 0.495 0.471 0.401 0.366 3 0.3 34.416 4.122 2.405 1.516 1.197 1.027 0.918 0.842 0.786 0.742 0.707 0.602 0.548 4 0.4 45.888 5.496 3.207 2.021 1.597 1.369 1.225 1.123 1.048 0.990 0.943 0.802 0.731 5 0.5 57.360 6.870 4.009 2.526 1.996 1.712 1.531 1.404 1.310 1.237 1.179 1.003 0.914 6 0.6 68.832 8.244 4.811 3.031 2.395 2.054 1.837 1.685 1.572 1.484 1.414 1.203 1.097 7 0.7 80.304 9.618 5.612 3.536 2.794 2.396 2.143 1.966 1.834 1.732 1.650 1.404 1.279 8 0.8 91.776 10.992 6.414 4.042 3.193 2.738 2.449 2.247 2.096 1.979 1.886 1.604 1.462 9 0.9 ##### 12.366 7.216 4.547 3.592 3.081 2.755 2.527 2.358 2.227 2.122 1.805 1.645

10 1.0 ##### 13.740 8.018 5.052 3.991 3.423 3.061 2.808 2.620 2.474 2.357 2.005 1.828

1.1 1 0.1 15.774 1.889 1.102 0.695 0.549 0.471 0.421 0.386 0.360 0.340 0.324 0.276 0.251 2 0.2 31.548 3.779 2.205 1.389 1.098 0.941 0.842 0.772 0.721 0.680 0.648 0.552 0.503 3 0.3 47.322 5.668 3.307 2.084 1.646 1.412 1.263 1.158 1.081 1.021 0.972 0.827 0.754 4 0.4 63.096 7.557 4.410 2.779 2.195 1.883 1.684 1.545 1.441 1.361 1.297 1.103 1.005 5 0.5 78.870 9.446 5.512 3.473 2.744 2.353 2.105 1.931 1.801 1.701 1.621 1.379 1.256 6 0.6 94.644 11.336 6.615 4.168 3.293 2.824 2.526 2.317 2.162 2.041 1.945 1.655 1.508 7 0.7 ##### 13.225 7.717 4.863 3.842 3.295 2.947 2.703 2.522 2.381 2.269 1.930 1.759 8 0.8 ##### 15.114 8.820 5.557 4.390 3.765 3.368 3.089 2.882 2.721 2.593 2.206 2.010 9 0.9 ##### 17.004 9.922 6.252 4.939 4.236 3.789 3.475 3.242 3.062 2.917 2.482 2.262

10 1.0 ##### 18.893 11.024 6.947 5.488 4.707 4.209 3.861 3.603 3.402 3.241 2.758 2.513

5.5.2 IEC A CURVES

5-22 735/737 Feeder Protection Relay

GE Power Management

Page 85

5 OVERCURRENT CURVES 5.5 IEC CURVES

735/737 IEC-A CURVE

GE POWER MANAGEMENT

1000

100

(NORMAL INVERSE)

CURVE MULTIPLIER

735 IEC FACEPLATE EQUIVALENT

TIME IN SECONDS

GE Power Management

0.1

10 1.0 9 0.9 8 0.8

7 0.7 6 0.6

5 0.5

4 0.4

3 0.3

2 0.2

1 0.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

Figure 5–11: IEC A CURVES

735/737 Feeder Protection Relay 5-23

803653A4.CDR

Page 86

5.5 IEC CURVES 5 OVERCURRENT CURVES



The trip time is given by:

TSM

××

----------------------------- -

 

⁄()

–

where: T = trip time (in seconds) K = 13.500 (curve shape constant)

S = curve shift multiplier E = 1.000 (curve shape constant) M = 735/737 curve multiplier setpoint I = input current (in amps) Ipu = pickup current setpoint

S MULT CURRENT (per unit I /I0)– values below calculated using the IEC M value

735 IEC 1.05 1.50 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

1 1 0.1 27.001 2.700 1.350 0.675 0.449 0.337 0.269 0.225 0.192 0.168 0.150 0.096 0.071

2 0.2 54.002 5.401 2.701 1.349 0.899 0.674 0.539 0.449 0.385 0.337 0.299 0.193 0.143 3 0.3 81.002 8.101 4.051 2.024 1.348 1.011 0.808 0.674 0.577 0.505 0.449 0.289 0.214 4 0.4 ##### 10.801 5.401 2.699 1.798 1.348 1.078 0.898 0.770 0.674 0.599 0.386 0.285 5 0.5 ##### 13.502 6.751 3.374 2.247 1.685 1.347 1.123 0.962 0.842 0.749 0.482 0.356 6 0.6 ##### 16.202 8.102 4.048 2.697 2.022 1.617 1.347 1.155 1.010 0.898 0.579 0.428 7 0.7 ##### 18.903 9.452 4.723 3.146 2.359 1.886 1.572 1.347 1.179 1.048 0.675 0.499 8 0.8 ##### 21.603 10.802 5.398 3.596 2.696 2.156 1.796 1.540 1.347 1.198 0.772 0.570 9 0.9 ##### 24.303 12.152 6.073 4.045 3.032 2.425 2.021 1.732 1.516 1.348 0.868 0.641

10 1.0 ##### 27.004 13.503 6.747 4.495 3.369 2.695 2.245 1.924 1.684 1.497 0.964 0.713

0.5 1 0.1 13.500 1.350 0.675 0.337 0.225 0.168 0.135 0.112 0.096 0.084 0.075 0.048 0.036 2 0.2 27.001 2.700 1.350 0.675 0.449 0.337 0.269 0.225 0.192 0.168 0.150 0.096 0.071 3 0.3 40.501 4.051 2.025 1.012 0.674 0.505 0.404 0.337 0.289 0.253 0.225 0.145 0.107 4 0.4 54.002 5.401 2.701 1.349 0.899 0.674 0.539 0.449 0.385 0.337 0.299 0.193 0.143 5 0.5 67.502 6.751 3.376 1.687 1.124 0.842 0.674 0.561 0.481 0.421 0.374 0.241 0.178 6 0.6 81.002 8.101 4.051 2.024 1.348 1.011 0.808 0.674 0.577 0.505 0.449 0.289 0.214 7 0.7 94.503 9.451 4.726 2.362 1.573 1.179 0.943 0.786 0.674 0.589 0.524 0.338 0.249 8 0.8 ##### 10.801 5.401 2.699 1.798 1.348 1.078 0.898 0.770 0.674 0.599 0.386 0.285 9 0.9 ##### 12.152 6.076 3.036 2.023 1.516 1.213 1.010 0.866 0.758 0.674 0.434 0.321

10 1.0 ##### 13.502 6.751 3.374 2.247 1.685 1.347 1.123 0.962 0.842 0.749 0.482 0.356

0.8 1 0.1 21.601 2.160 1.080 0.540 0.360 0.270 0.216 0.180 0.154 0.135 0.120 0.077 0.057 2 0.2 43.201 4.321 2.160 1.080 0.719 0.539 0.431 0.359 0.308 0.269 0.240 0.154 0.114 3 0.3 64.802 6.481 3.241 1.619 1.079 0.809 0.647 0.539 0.462 0.404 0.359 0.231 0.171 4 0.4 86.403 8.641 4.321 2.159 1.438 1.078 0.862 0.718 0.616 0.539 0.479 0.309 0.228 5 0.5 ##### 10.801 5.401 2.699 1.798 1.348 1.078 0.898 0.770 0.674 0.599 0.386 0.285 6 0.6 ##### 12.962 6.481 3.239 2.158 1.617 1.293 1.078 0.924 0.808 0.719 0.463 0.342 7 0.7 ##### 15.122 7.561 3.778 2.517 1.887 1.509 1.257 1.078 0.943 0.839 0.540 0.399 8 0.8 ##### 17.282 8.642 4.318 2.877 2.156 1.725 1.437 1.232 1.078 0.958 0.617 0.456 9 0.9 ##### 19.443 9.722 4.858 3.236 2.426 1.940 1.617 1.386 1.213 1.078 0.694 0.513

10 1.0 ##### 21.603 10.802 5.398 3.596 2.696 2.156 1.796 1.540 1.347 1.198 0.772 0.570

1.1 1 0.1 29.701 2.970 1.485 0.742 0.494 0.371 0.296 0.247 0.212 0.185 0.165 0.106 0.078 2 0.2 59.402 5.941 2.971 1.484 0.989 0.741 0.593 0.494 0.423 0.371 0.329 0.212 0.157 3 0.3 89.103 8.911 4.456 2.227 1.483 1.112 0.889 0.741 0.635 0.556 0.494 0.318 0.235 4 0.4 ##### 11.882 5.941 2.969 1.978 1.483 1.186 0.988 0.847 0.741 0.659 0.424 0.314 5 0.5 ##### 14.852 7.426 3.711 2.472 1.853 1.482 1.235 1.058 0.926 0.824 0.530 0.392 6 0.6 ##### 17.822 8.912 4.453 2.967 2.224 1.778 1.482 1.270 1.112 0.988 0.637 0.470 7 0.7 ##### 20.793 10.397 5.195 3.461 2.594 2.075 1.729 1.482 1.297 1.153 0.743 0.549 8 0.8 ##### 23.763 11.882 5.938 3.956 2.965 2.371 1.976 1.694 1.482 1.318 0.849 0.627 9 0.9 ##### 26.734 13.368 6.680 4.450 3.336 2.668 2.223 1.905 1.667 1.482 0.955 0.705

10 1.0 ##### 29.704 14.853 7.422 4.944 3.706 2.964 2.470 2.117 1.853 1.647 1.061 0.784

5.5.3 IEC B CURVES

5-24 735/737 Feeder Protection Relay

GE Power Management

Page 87

5 OVERCURRENT CURVES 5.5 IEC CURVES

735/737 IEC-B CURVE

GE POWER MANAGEMENT

1000

100

(VERY INVERSE)

TIME IN SECONDS

0.1

CURVE MULTIPLIER

735 IEC FACEPLATE EQUIVALENT

10 1.0

90.9

80.8

70.7

60.6

50.5

40.4

30.3

20.2

10.1

GE Power Management

0.01

0.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

803652A4.CDR

Figure 5–12: IEC B CURVES

735/737 Feeder Protection Relay 5-25

Page 88

5.5 IEC CURVES 5 OVERCURRENT CURVES



The trip time is given by:

TSM

××

----------------------------- -

 

⁄()

–

where: T = trip time (in seconds) K = 80.000 (curve shape constant)

S = curve shift multiplier E = 2.000 (curve shape constant) M = 735/737 curve multiplier setpoint I = input current (in amps) Ipu = pickup current setpoint

S MULT CURRENT (per unit I /I0)– values below calculated using the IEC M value

735 IEC 1.05 1.50 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 15.00 20.00

1 1 0.1 78.049 6.400 2.667 1.000 0.533 0.333 0.228 0.167 0.127 0.100 0.081 0.036 0.020

2 0.2 ##### 12.800 5.334 2.000 1.066 0.666 0.457 0.333 0.254 0.200 0.162 0.072 0.041 3 0.3 ##### 19.201 8.001 3.000 1.599 0.999 0.685 0.500 0.381 0.300 0.242 0.108 0.061 4 0.4 ##### 25.601 10.668 4.000 2.132 1.332 0.913 0.666 0.508 0.400 0.323 0.144 0.082 5 0.5 ##### 32.001 13.335 5.000 2.666 1.665 1.142 0.833 0.634 0.500 0.404 0.180 0.102 6 0.6 ##### 38.401 16.001 6.000 3.199 1.999 1.370 0.999 0.761 0.600 0.485 0.216 0.123 7 0.7 ##### 44.802 18.668 7.000 3.732 2.332 1.599 1.166 0.888 0.700 0.566 0.252 0.143 8 0.8 ##### 51.202 21.335 7.999 4.265 2.665 1.827 1.332 1.015 0.800 0.647 0.288 0.164 9 0.9 ##### 57.602 24.002 8.999 4.798 2.998 2.055 1.499 1.142 0.900 0.727 0.324 0.184

10 1.0 ##### 64.002 26.669 9.999 5.331 3.331 2.284 1.665 1.269 1.000 0.808 0.360 0.204

0.5 1 0.1 39.024 3.200 1.333 0.500 0.267 0.167 0.114 0.083 0.063 0.050 0.040 0.018 0.010 2 0.2 78.049 6.400 2.667 1.000 0.533 0.333 0.228 0.167 0.127 0.100 0.081 0.036 0.020 3 0.3 ##### 9.600 4.000 1.500 0.800 0.500 0.343 0.250 0.190 0.150 0.121 0.054 0.031 4 0.4 ##### 12.800 5.334 2.000 1.066 0.666 0.457 0.333 0.254 0.200 0.162 0.072 0.041 5 0.5 ##### 16.001 6.667 2.500 1.333 0.833 0.571 0.416 0.317 0.250 0.202 0.090 0.051 6 0.6 ##### 19.201 8.001 3.000 1.599 0.999 0.685 0.500 0.381 0.300 0.242 0.108 0.061 7 0.7 ##### 22.401 9.334 3.500 1.866 1.166 0.799 0.583 0.444 0.350 0.283 0.126 0.072 8 0.8 ##### 25.601 10.668 4.000 2.132 1.332 0.913 0.666 0.508 0.400 0.323 0.144 0.082 9 0.9 ##### 28.801 12.001 4.500 2.399 1.499 1.028 0.749 0.571 0.450 0.364 0.162 0.092

10 1.0 ##### 32.001 13.335 5.000 2.666 1.665 1.142 0.833 0.634 0.500 0.404 0.180 0.102

0.8 1 0.1 62.439 5.120 2.134 0.800 0.426 0.266 0.183 0.133 0.102 0.080 0.065 0.029 0.016 2 0.2 ##### 10.240 4.267 1.600 0.853 0.533 0.365 0.266 0.203 0.160 0.129 0.058 0.033 3 0.3 ##### 15.361 6.401 2.400 1.279 0.799 0.548 0.400 0.305 0.240 0.194 0.086 0.049 4 0.4 ##### 20.481 8.534 3.200 1.706 1.066 0.731 0.533 0.406 0.320 0.259 0.115 0.065 5 0.5 ##### 25.601 10.668 4.000 2.132 1.332 0.913 0.666 0.508 0.400 0.323 0.144 0.082 6 0.6 ##### 30.721 12.801 4.800 2.559 1.599 1.096 0.799 0.609 0.480 0.388 0.173 0.098 7 0.7 ##### 35.841 14.935 5.600 2.985 1.865 1.279 0.932 0.711 0.560 0.453 0.201 0.114 8 0.8 ##### 40.961 17.068 6.400 3.412 2.132 1.462 1.066 0.812 0.640 0.517 0.230 0.131 9 0.9 ##### 46.082 19.202 7.200 3.838 2.398 1.644 1.199 0.914 0.720 0.582 0.259 0.147

10 1.0 ##### 51.202 21.335 7.999 4.265 2.665 1.827 1.332 1.015 0.800 0.647 0.288 0.164

1.1 1 0.1 85.854 7.040 2.934 1.100 0.586 0.366 0.251 0.183 0.140 0.110 0.089 0.040 0.022 2 0.2 ##### 14.080 5.867 2.200 1.173 0.733 0.502 0.366 0.279 0.220 0.178 0.079 0.045 3 0.3 ##### 21.121 8.801 3.300 1.759 1.099 0.754 0.549 0.419 0.330 0.267 0.119 0.067 4 0.4 ##### 28.161 11.734 4.400 2.346 1.466 1.005 0.733 0.558 0.440 0.356 0.158 0.090 5 0.5 ##### 35.201 14.668 5.500 2.932 1.832 1.256 0.916 0.698 0.550 0.445 0.198 0.112 6 0.6 ##### 42.241 17.602 6.600 3.519 2.198 1.507 1.099 0.837 0.660 0.533 0.237 0.135 7 0.7 ##### 49.282 20.535 7.699 4.105 2.565 1.758 1.282 0.977 0.770 0.622 0.277 0.157 8 0.8 ##### 56.322 23.469 8.799 4.691 2.931 2.010 1.465 1.117 0.880 0.711 0.316 0.180 9 0.9 ##### 63.362 26.402 9.899 5.278 3.298 2.261 1.648 1.256 0.990 0.800 0.356 0.202

10 1.0 ##### 70.402 29.336 10.999 5.864 3.664 2.512 1.832 1.396 1.100 0.889 0.396 0.225

5.5.4 IEC C CURVES

5-26 735/737 Feeder Protection Relay

GE Power Management

Page 89

5 OVERCURRENT CURVES 5.5 IEC CURVES

735/737 IEC-C CURVE

GE POWER MANAGEMENT

1000

100

(EXTREMELY INVERSE)

TIME IN SECONDS

0.1

CURVE MULTIPLIER

735 IEC FACEPLATE EQUIVALENT

10 1.0 9 0.9 8 0.8

7 0.7 6 0.6 5 0.5

4 0.4

3 0.3

2 0.2

1 0.1

GE Power Management

0.01

0.1

1 10 100

MULTIPLE OF PICKUP CURRENT (PER UNIT)

803651A4.CDR

Figure 5–13: IEC C CURVES

735/737 Feeder Protection Relay 5-27

Page 90

5.5 IEC CURVES 5 OVERCURRENT CURVES

5-28 735/737 Feeder Protection Relay

GE Power Management

Page 91

6 TESTING 6.1 PROCEDURES

WARNING

6 TESTING 6.1 PROCEDURES 6.1.1 PRIMARY INJECTION TESTING

This is the preferred method of testing as complete system operation can be checked by injecting current through the phase and ground CTs. To do this a primary (high current) test set is required. The operation of the entire system including CTs and wiring can then be checked. If this equip ment is not avai lable, second ary inj ect ion test s can be perfor med to ch eck everything except the CTs. This procedure is described in the following sections.

6.1.2 SECONDARY INJECTION TESTING

Single phase secondary injection testing can be performed using a test setup similar to that Figure 6–1: TEST SETUP on page 6–2. Tests can be performed with the user program med rel ay settings or with any others the teste r requires . The rela y settings should be recorded on the relay setting sheet (see Section 6.2: TEST RECORDS on page 6–4) so they can be reset when the relay is again put into service.

NEVER OPEN THE SECONDARY CIRCUIT OF A LIVE CT. THE HIGH VOLTAGE PRODUCED MAY RESULT IN A SITUATION DANGEROUS TO BOTH PERSONNEL AND EQUIPMENT!

6.1.3 COMMUNICATIONS TEST

A PC equipped with an RS232/RS485 convertor and the Setup program can be used to establish communications with the 735 or 737. See Sections 2.2.4: COMMUNICATIONS on page 2–8 and 3.5: SETUP PROGRAM on page 3–11. With the use of the setup program or Relaycom, custom scheme setpoints can be set and tested and the actual values screens can be used to monitor metered da ta and pre-t rip data. R elay opera tio n can also be simul ated for trai ning or testi ng purpos es to understand how the relay operates.

6.1.4 PHASE CURRENT READING ACCURACY TEST

The 735/737 relay must read the phase current signals input from the CTs correctly to provide the instantaneous and timed overcurrent protection. To determine if the relay is reading correctly set the phase pickup dial to 100% of the CT primary. Use the 3 Phase Test Set to set the phase current injected i nto the phases. Usual ly a m id value and a high value are te ste d (i.e. 40 and 400% of CT). Remember the current value injected will be de pen den t on w het her 5A or 1A C Ts are used in the relay.

6.1.5 GROUND CURRENT READING ACCURACY TEST

This test is done in a similar manner to that for the phases. However lower or different values of injected current may be desired to test.

6.1.6 INSTANTANEOUS PHASE OVERCURRENT PICKUP LEVEL TEST

Set the phase pickup dial to OFF. Set the phase instantaneous dial to the desired level. Usually a low and a high value are tested (i.e. 4 x CT and 14 x CT). Using the 3-phase Test Set slowly increase the phase current injected until the trip or auxiliary relay (if assign ed) is acti vat ed and th e corres pondi ng LED ill umina ted. Verify that the injected current at the time of tri p corresponds to the instantaneous trip level setting ±3%.

6.1.7 INSTANTANEOUS GROUND FAULT OVERCURRENT PICKUP LEVEL TEST

Set the ground pickup dial to OFF. Set the ground instantaneous dial to the desired level. Usually a low and a high value are tested (i.e. 0.1 x CT and 8 x CT). Using the 3-phase Test Set slowly increase the current injected into the ground CT input until the trip or auxiliary relay (depending upon how assigned) is activated and the corresponding LED illuminated. Verify that the injected current at the time of trip corresponds to the instantaneous trip level setting ±3%.

GE Power Management

735/737 Feeder Protection Relay 6-1

Page 92

6.1 PROCEDURES 6 TESTING

Figure 6–1: TEST SETUP

6-2 735/737 Feeder Protection Relay

GE Power Management

Page 93

6 TESTING 6.1 PROCEDURES

6.1.8 INSTANTANEOUS PHASE OVERCURRENT TIMING TEST

Set the phase pickup dial to OFF. Set the phase instantaneous dial to the desired level. Using the 3-phase Test Set inject current equal to or above the instantaneous level setting. The timer on the 3-phase Test Set should be setup to start when current is injected and stop when the trip or auxiliary (if assigned) relay activates. Verify that the INST 50 phase A, B, or C (whichever phase tested) LED has been activated and latched.

6.1.9 INSTANTANEOUS GROUND FAULT OVERCURRENT TIMING TEST

Set the ground pickup dial to OFF. Set the ground instantaneous dial to the desired level. Using the 3-phase Test Set inject current equal to or above the instantaneous level setting. The timer on the 3-phase Test Set should be setup to start when current is injected and stop when the trip and/or auxiliary relay (depending upon how assigned) activates. Verify that the INST 50 N LED has been activated and latched.

6.1.10 PHASE OVERCURRENT CURVE VERIFICATION

Using the switches on the faceplate select the desired settings to test. i.e. pickup, curve shape and time multiplier. Set instantaneous switch to OFF. From the option dip switches located on the side of the relay select the phase time multiplier shift. If the curve type needs to be changed or checked this can be done through the setup program-setpoints-custom scheme. If a curve type other than ANSI is selected remember to enable switch 8 of the option dip switches. Using the 3phase test set adjust the phase current to the desired trip level. Reset any current trips on the relay and press the test start button to activate the timer and inject the current. The timer on the 3-phase Test Set should be setup to start when current is injected and stop when the trip or auxiliary (if assigned) relay activates. Verify that the TIME 51 phase A, B, or C (whichever phase tested) LED ha s been a ctiva ted and la tched. Ch eck th e trip ti me wi th the ti mes a nd curv es loc ated i n Chapter 5. The accuracy of the timing is 3% or ±20 ms at > 150% of pickup.

The more inverse the curve the more accurate the current source required to yield accurate time measurements. A small error in injected current will create a larger error in time to trip due to the extreme slope of the curve.

NOTE

6.1.11 GROUND FAULT OVERCURRENT CURVE VERIFICATION

This test is done in a similar manner to that for the phases. However different settings and current levels may be desired to test. Verify that the TIME 51 N LED has been activated and latched after a trip.

6.1.12 POWER LOSS/RECOVER TEST

A variac can be used to vary the supply voltage applied to the relay. First cause a trip on the relay and make note of the LED illuminated. The service relay H7 and G8 contacts should be open. Lower the voltage applied to the relay. The relay should not power off and the service re lay c hange s tate u ntil be low the s peci fied ran ge for t he pow er sup ply use d. See Sec tion 1.3 SPECIFICATIONS on page 1–6. After the rel ay p ow ers off the service rela y should change sta te and the LEDs turn off. Now power up the relay. The relay should turn on and the service relay change state at or before the specified power supply range. The trip LED should again be illuminated.

6.1.13 HI POTENTIAL TEST

All terminals except filter ground and communications (H8, H9, H10, G9, G10) can be hi-pot tested. All remaining terminals except safety ground (G12) should be connected together and the test performed with respect to safety ground. Make sure to disconnect the filter ground (G11) before performing this test. Refer to Section 2.2.7 HI-POT TESTING on page 2–12 for more information.

GE Power Management

735/737 Feeder Protection Relay 6-3

Page 94

6.2 TEST RECORDS 6 TESTING

6.2 TEST RECORDS 6.2.1 735/737 TEST RECORD

MODEL NUMBER: DATE FIRMWARE NUMBER: TESTED BY SERIAL NUMBER: STATION: CIRCUIT

6.2.2 COMMUNICATIONS TEST

TYPE OF COMMUNICATIONS ESTABLIS HED STA TUS

6.2.3 PHASE CURRENT READING ACCURACY TEST

PHASE AND LEVEL INPUT CURRENT

(%CT)

PHASE 1 CURRENT LOW END PHASE 1 CURRENT HIGH END PHASE 2 CURRENT LOW END PHASE 2 CURRENT HIGH END PHASE 3 CURRENT LOW END PHASE 3 CURRENT HIGH END

GROUND LEVEL INPUT CURRENT

(%CT)

GROUND CURRENT LOW END GROUND CURRENT MID RANGE GROUND CURRENT HIGH END

MEASURED CURRENT (%CT)

STATUS

6.2.4 GROUND CURRENT READING ACCURACY TEST

MEASURED CURRENT (%CT)

STATUS

6-4 735/737 Feeder Protection Relay

GE Power Management

Page 95

6 TESTING 6.2 TEST RECORDS

6.2.5 INSTANTANEOUS PHASE OVERCURRENT PICKUP TEST

PHASE AND LEVEL DIAL SETTING

(xCT)

PHASE 1 / LOW END PHASE 1 / HIGH END PHASE 2 / LOW END PHASE 2 /HIGH END PHASE 3 / LOW END PHASE 3 / HIGH END

PHASE AND LEVEL DIAL SETTING

(xCT)

GROUND / LOW END GROUND / HIGH END

PHASE AND LEVEL DIAL SETTING

(xCT)

INPUT CURRENT ()

STATUS

6.2.6 INSTANTANEOUS GROUND OVERCURRENT PICKUP TEST

INPUT CURRENT ()

STATUS

6.2.7 INSTANTANEOUS PHASE OVERCURRENT TIMING TEST

INPUT CURRENT ( )

EXPECTED

TIME (ms)

MEASURED

TIME (ms)

STATUS

PHASE 1 / LOW END ≤ 35 PHASE 1 / HIGH END ≤ 35 PHASE 2 / LOW END ≤ 35 PHASE 2 /HIGH END ≤ 35 PHASE 3 / LOW END ≤ 35 PHASE 3 / HIGH END ≤ 35

6.2.8 INSTANTANEOUS GROUND FAULT OVERCURRENT TIMING TEST

GROUND LEVEL DIAL SETTING

(xCT)

GROUND / LOW END ≤ 35 GROUND / HIGH END ≤ 35

INPUT CURRENT ( )

EXPECTED

TIME (ms)

MEASURED

TIME (ms)

STATUS

GE Power Management

735/737 Feeder Protection Relay 6-5

Page 96

6.2 TEST RECORDS 6 TESTING

6.2.9 PHASE OVERCURRENT CURVE VERIFICATION

PICKUP LEVEL

CURVE SHAPE TIME

MULT

TIME SHIFT

INPUT CURRENT ( )

EXPECTED TIME

MEASURED TIME

STATUS

6-6 735/737 Feeder Protection Relay

GE Power Management

Page 97

6 TESTING 6.2 TEST RECORDS

6.2.10 GROUND FAULT OVERCURRENT CURVE VERIFICATION

PICKUP LEVEL

CURVE SHAPE TIME

MULT

TIME SHIFT

INPUT CURRENT ( )

EXPECTED TIME

MEASURED TIME

STATUS

6.2.11 POWER FAIL/RECOVER TEST

POWER FAIL/RECOVERY LEVEL (V) MEASURED LEVEL (V) STATUS

FAIL @ RECOVER @

6.2.12 HI POTENTIAL TEST

Note the Filter Ground (terminal G11) must be left floating for this test. See Section 2.2.7 HI-POT TESTING on page 2–12 for details.

HIPOT LEVEL (kV) DURATIO N ( ) STATUS

GE Power Management

735/737 Feeder Protection Relay 6-7

Page 98

6.2 TEST RECORDS 6 TESTING

6-8 735/737 Feeder Protection Relay

GE Power Management

Page 99

7 COMMISSIONING 7.1 SETTINGS TABLE

7 COMMISSIONING 7.1 SETTINGS TABLE 7.1.1 INSTALLATION INFORMATION

STATION NAME EQUIPMENT DESIGNATION VOLTAGE DEVICE NUMBER CT RATIO ISSUE DATE APPLIED DATE 735/737 SERIAL NUMBER

7.1.2 RELAY SETTINGS

PHASE DIAL SETTINGS

Phase Pickup Dial (LO: 20 to 100% of CT; HI: 110 to 220% of CT; OFF) Curve Shape Dial (MI, NI, VI, EI, Definite Time – HI/LO) Phase Time Multiplier Dial (1 to 10) Phase Instantaneous Dial (OFF, 4, 5, 6, 8, 10, 12, 14, 16, 20 x CT)

GROUND DIAL SETTINGS

Ground Pickup Dial (LO: 15 to 55% of CT; HI: 60 to 100% of CT; OFF) Ground Shape Dial (MI, NI, VI, EI, Definite Time – HI/LO) Ground Time Multiplier Dial (1 to 10) Ground Instantaneous Dial (OFF, 0.1, 0.2, 0.4, 0.8, 1, 2, 4, 8, 16 x CT)

OPTION SWITCH SETTINGS

Phase O/C Shift Multiplier (0.5, 0.8, 1.0, 1.1) Ground Time O/C Shift Multiplier (0.5, 0.8, 1.0, 1.1) Frequency (50 Hz, 60 Hz) Output Relays (Pulsed, Latched, Pickup, Pickup and Latched) – 737 only Custom Scheme (Disabled, Enabled) Custom Scheme > Time Overcurrent Curve Shape (ANSI, IAC, BS142) Custom Scheme > Block Instantaneous on Autoreclose (Disabled, Enabled)

Custom Scheme > Aux Trip Relay (Main Trip, 86 Lockout, Ground Trip)

COMMUNICATIONS SETTINGS

Baud Rate Communications Address

GE Power Management

735/737 Feeder Protection Relay 7-1

Page 100

7.1 SETTINGS TABLE 7 COMMISSIONING

7-2 735/737 Feeder Protection Relay

GE Power Management