GE 745 Instruction Manual
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GE
Grid Solutions
745
Transformer Protection System
Instruction Manual
745 revision: 5.20
Manual Part Number: 1601-0161-AG
GE publication code: GEK-106635Q
GE Grid Solutions
650 Markland Street
Markham, Ontario
Canada L6C 0M1
Tel: +1 905 927 7070 Fax: +1 905 927 5098
Internet: http://www.gegridsolutions.com
*1601-0161-AG*
© 2016 GE Multilin Inc. All rights reserved.
GE Multilin Inc. 745 Transformer Protection System instruction manual for revision 5.20.
745 Transformer Protection System, EnerVista, EnerVista Launchpad, EnerVista 745 Setup, and FlexLogic are registered
trademarks of GE Multilin Inc.
The contents of this manual are the property of GE Multilin Inc. This documentation is furnished on license and may not be
reproduced in whole or in part without the permission of GE Multilin Inc. The content of this manual is for informational use
only and is subject to change without notice.
Part numbers contained in this manual are subject to change without notice, and should therefore be verified by GE
Multilin Inc. before ordering.
Part number: 1601-0161-AG (June 2016)
Table of Contents
1: GETTING STARTED IMPORTANT PROCEDURES .......................................................................................................... 1-1
C
AUTIONS AND WARNINGS ............................................................................................... 1-1
I
NSPECTION CHECKLIST ...................................................................................................... 1-1
M
ANUAL ORGANIZATION ................................................................................................... 1-2
USING THE RELAY ............................................................................................................................ 1-3
M
ENU NAVIGATION ............................................................................................................. 1-3
P
ANEL KEYING EXAMPLE .................................................................................................... 1-5
CHANGING SETPOINTS ................................................................................................................. 1-6
I
NTRODUCTION .....................................................................................................................1-6
U
SING THE HELP KEY ........................................................................................................ 1-6
N
UMERICAL SETPOINTS ...................................................................................................... 1-6
E
NUMERATION SETPOINTS .................................................................................................1-7
T
EXT SETPOINTS .................................................................................................................. 1-7
SECURITY ............................................................................................................................................. 1-9
I
NSTALLATION ....................................................................................................................... 1-9
C
HANGING THE PASSCODE ................................................................................................1-9
D
ISABLING AND ENABLING PASSCODE SECURITY .......................................................... 1-10
2: OVERVIEW INTRODUCTION ................................................................................................................................2-1
ESCRIPTION ........................................................................................................................ 2-1
D
P
ROTECTION FEATURES ...................................................................................................... 2-2
O
RDER CODES ..................................................................................................................... 2-3
SPECIFICATIONS ............................................................................................................................... 2-5
A
PPLICABILITY ...................................................................................................................... 2-5
I
NPUTS .................................................................................................................................. 2-5
P
ROTECTION ELEMENTS ...................................................................................................... 2-6
O
UTPUTS ...............................................................................................................................2-9
M
ISCELLANEOUS .................................................................................................................. 2-10
3: INSTALLATION DRAWOUT CASE ............................................................................................................................... 3-1
ASE DESCRIPTION ............................................................................................................. 3-1
C
P
ANEL CUTOUT .................................................................................................................... 3-2
C
ASE MOUNTING ................................................................................................................. 3-2
U
NIT WITHDRAWAL AND INSERTION ................................................................................3-3
E
THERNET CONNECTION ..................................................................................................... 3-6
TYPICAL WIRING ............................................................................................................................... 3-7
D
ESCRIPTION ........................................................................................................................ 3-7
R
EAR TERMINAL LAYOUT ....................................................................................................3-7
W
IRING DIAGRAMS ............................................................................................................. 3-10
P
HASE SEQUENCE AND TRANSFORMER POLARITY ......................................................... 3-12
C
URRENT TRANSFORMER INPUTS .....................................................................................3-12
AC V
OLTAGE INPUT ............................................................................................................3-14
L
OGIC INPUTS ...................................................................................................................... 3-14
C
ONTROL POWER ................................................................................................................ 3-15
A
NALOG INPUT ....................................................................................................................3-16
T
AP POSITION INPUT ........................................................................................................... 3-16
RTD D
RIVER/SENSOR ........................................................................................................ 3-16
O
UTPUT RELAYS .................................................................................................................. 3-16
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL TOC–I
SOLID STATE TRIP OUTPUT ................................................................................................ 3-17
A
NALOG OUTPUTS ..............................................................................................................3-17
RS485/RS422 C
RS232 F
RONT PANEL PROGRAM PORT ..........................................................................3-19
OMMUNICATIONS ................................................................................ 3-17
IRIG-B .................................................................................................................................. 3-20
D
IELECTRIC STRENGTH .......................................................................................................3-20
4: INTERFACES HARDWARE INTERFACE ................................................................................................................ 4-1
RONT PANEL ......................................................................................................................4-1
F
D
ISPLAY ................................................................................................................................. 4-2
LED
S ..................................................................................................................................... 4-2
LED I
NDICATORS .................................................................................................................4-2
P
ROGRAM PORT ................................................................................................................... 4-4
K
EYPAD ................................................................................................................................. 4-4
S
ETPOINT ENTRY .................................................................................................................. 4-5
D
IAGNOSTIC MESSAGES ..................................................................................................... 4-7
F
LASH MESSAGES ................................................................................................................4-7
ENERVISTA SOFTWARE INTERFACE .........................................................................................4-8
O
VERVIEW ............................................................................................................................ 4-8
H
ARDWARE ...........................................................................................................................4-8
I
NSTALLING THE ENERVISTA 745 SETUP SOFTWARE .................................................... 4-10
CONNECTING ENERVISTA 745 SETUP TO THE RELAY ...................................................... 4-13
C
ONFIGURING SERIAL COMMUNICATIONS ........................................................................4-13
U
SING THE QUICK CONNECT FEATURE ............................................................................ 4-15
C
ONFIGURING ETHERNET COMMUNICATIONS ................................................................. 4-15
C
ONNECTING TO THE RELAY .............................................................................................. 4-17
WORKING WITH SETPOINTS AND SETPOINT FILES ........................................................... 4-19
E
NGAGING A DEVICE ........................................................................................................... 4-19
E
NTERING SETPOINTS ......................................................................................................... 4-19
F
ILE SUPPORT ...................................................................................................................... 4-21
U
SING SETPOINTS FILES ..................................................................................................... 4-21
UPGRADING RELAY FIRMWARE ................................................................................................. 4-27
D
ESCRIPTION ........................................................................................................................ 4-27
S
AVING SETPOINTS TO A FILE ............................................................................................ 4-27
L
OADING NEW FIRMWARE ................................................................................................. 4-27
ADVANCED ENERVISTA 745 SETUP FEATURES ................................................................... 4-30
T
RIGGERED EVENTS .............................................................................................................4-30
W
AVEFORM CAPTURE (TRACE MEMORY) .......................................................................... 4-30
T
RENDING (DATA LOGGER) .................................................................................................4-32
E
VENT RECORDER ................................................................................................................4-35
M
ODBUS USER MAP ........................................................................................................... 4-36
V
IEWING ACTUAL VALUES .................................................................................................. 4-37
USING ENERVISTA VIEWPOINT WITH THE 745 ................................................................... 4-40
P
LUG AND PLAY EXAMPLE .................................................................................................4-40
5: SETPOINTS OVERVIEW ........................................................................................................................................... 5-1
ETPOINT MESSAGE MAP ................................................................................................... 5-1
S
S
ETPOINT ENTRY .................................................................................................................. 5-4
S
ETPOINT WRITE ACCESS ................................................................................................... 5-4
AUTO-CONFIGURATION ................................................................................................................ 5-6
I
NTRODUCTION .....................................................................................................................5-6
D
YNAMIC CT RATIO MISMATCH CORRECTION ................................................................ 5-6
TOC–II 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
PHASE SHIFTS ON THREE-PHASE TRANSFORMERS ......................................................... 5-8
P
HASE ANGLE CORRECTION .............................................................................................. 5-10
Z
ERO-SEQUENCE COMPONENT REMOVAL ....................................................................... 5-11
T
RANSFORMER TYPES ......................................................................................................... 5-13
P
HASE SHIFTS ...................................................................................................................... 5-24
S1 745 SETUP .................................................................................................................................... 5-25
P
ASSCODE ............................................................................................................................ 5-25
P
REFERENCES ....................................................................................................................... 5-25
C
OMMUNICATIONS .............................................................................................................. 5-26
R
ESETTING ............................................................................................................................ 5-29
C
LOCK ................................................................................................................................... 5-29
D
EFAULT MESSAGES ...........................................................................................................5-30
S
CRATCHPAD ........................................................................................................................ 5-31
I
NSTALLATION ....................................................................................................................... 5-31
U
PGRADE OPTIONS .............................................................................................................5-31
S
ETUP EVENT RECORDER ...................................................................................................5-33
S2 SYSTEM SETUP ............................................................................................................................ 5-34
D
ESCRIPTION ........................................................................................................................ 5-34
T
RANSFORMER ..................................................................................................................... 5-34
W
INDINGS 1 TO 3 ............................................................................................................... 5-36
O
NLOAD TAP CHANGER ..................................................................................................... 5-37
H
ARMONICS ......................................................................................................................... 5-38
F
LEXCURVES™ .................................................................................................................... 5-38
V
OLTAGE INPUT ................................................................................................................... 5-39
A
MBIENT TEMPERATURE ..................................................................................................... 5-39
A
NALOG INPUT ....................................................................................................................5-41
D
EMAND METERING ............................................................................................................5-41
A
NALOG OUTPUTS 1 TO 7 ................................................................................................. 5-43
S3 LOGIC INPUTS ............................................................................................................................. 5-44
D
ESCRIPTION ........................................................................................................................ 5-44
L
OGIC INPUTS 1 TO 16 ...................................................................................................... 5-44
V
IRTUAL INPUTS 1 TO 16 .................................................................................................. 5-45
S4 ELEMENTS ..................................................................................................................................... 5-46
I
NTRODUCTION TO ELEMENTS ........................................................................................... 5-46
S
ETPOINT GROUP ................................................................................................................ 5-47
D
IFFERENTIAL ELEMENT ..................................................................................................... 5-48
I
NSTANTANEOUS DIFFERENTIAL ........................................................................................ 5-57
P
HASE OVERCURRENT ........................................................................................................ 5-58
N
EUTRAL OVERCURRENT .................................................................................................... 5-66
G
ROUND OVERCURRENT .................................................................................................... 5-69
R
ESTRICTED GROUND FAULT .............................................................................................5-72
N
EGATIVE SEQUENCE OVERCURRENT .............................................................................. 5-76
F
REQUENCY .......................................................................................................................... 5-78
O
VEREXCITATION ................................................................................................................. 5-83
H
ARMONICS ......................................................................................................................... 5-88
I
NSULATION AGING .............................................................................................................5-90
A
NALOG INPUT LEVEL .........................................................................................................5-94
C
URRENT DEMAND ............................................................................................................. 5-95
T
RANSFORMER OVERLOAD ................................................................................................. 5-96
T
AP CHANGER FAILURE ...................................................................................................... 5-97
S5 OUTPUTS ....................................................................................................................................... 5-99
D
ESCRIPTION ........................................................................................................................ 5-99
R
ELAY ASSIGNMENTS .......................................................................................................... 5-99
I
NTRODUCTION TO FLEXLOGIC™ ...................................................................................... 5-99
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL TOC–III
FLEXLOGIC™ RULES ........................................................................................................... 5-100
O
UTPUT RELAYS ..................................................................................................................5-102
T
RACE MEMORY ................................................................................................................... 5-105
V
IRTUAL OUTPUTS ...............................................................................................................5-106
T
IMERS .................................................................................................................................. 5-106
S6 TESTING .........................................................................................................................................5-107
D
ESCRIPTION ........................................................................................................................ 5-107
O
UTPUT RELAYS ..................................................................................................................5-107
A
NALOG OUTPUTS ..............................................................................................................5-108
S
IMULATION ......................................................................................................................... 5-108
F
ACTORY SERVICE ................................................................................................................ 5-112
6: ACTUAL VALUES OVERVIEW ........................................................................................................................................... 6-1
ESSAGE MAP .....................................................................................................................6-1
M
D
ESCRIPTION ........................................................................................................................ 6-3
A1 STATUS ........................................................................................................................................... 6-4
N
ETWORK STATUS ............................................................................................................... 6-4
D
ATE AND TIME ................................................................................................................... 6-4
L
OGIC INPUTS ...................................................................................................................... 6-4
V
IRTUAL INPUTS ................................................................................................................... 6-5
O
UTPUT RELAYS ..................................................................................................................6-5
V
IRTUAL OUTPUTS ...............................................................................................................6-5
S
ELF-TEST ERRORS ..............................................................................................................6-6
A2 METERING ..................................................................................................................................... 6-7
C
URRENT ...............................................................................................................................6-7
H
ARMONIC CONTENT ......................................................................................................... 6-10
F
REQUENCY ..........................................................................................................................6-12
T
AP CHANGER ...................................................................................................................... 6-12
V
OLTAGE ...............................................................................................................................6-12
D
EMAND ...............................................................................................................................6-13
A
MBIENT TEMPERATURE .....................................................................................................6-14
L
OSS OF LIFE ........................................................................................................................ 6-14
A
NALOG INPUT ....................................................................................................................6-15
P
OWER .................................................................................................................................. 6-15
E
NERGY ................................................................................................................................. 6-15
A3 EVENT RECORDER ..................................................................................................................... 6-17
E
VENT DATA CLEAR ............................................................................................................6-17
E
VENT RECORDS ..................................................................................................................6-17
A4 PRODUCT INFORMATION ....................................................................................................... 6-21
T
ECHNICAL SUPPORT .......................................................................................................... 6-21
R
EVISION CODES ................................................................................................................. 6-21
C
ALIBRATION ........................................................................................................................ 6-22
TARGET AND FLASH MESSAGES ................................................................................................ 6-23
T
ARGET MESSAGES ............................................................................................................. 6-23
S
ELF-TEST ERRORS ..............................................................................................................6-25
F
LASH MESSAGES ................................................................................................................6-27
7: COMMISSIONING GENERAL .............................................................................................................................................. 7-1
NTRODUCTION .....................................................................................................................7-1
I
T
ESTING PHILOSOPHY ......................................................................................................... 7-2
S
AFETY PRECAUTIONS ......................................................................................................... 7-2
C
ONVENTIONS ...................................................................................................................... 7-2
TOC–IV 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
TEST EQUIPMENT ................................................................................................................. 7-3
PRELIMINARY WORK ...................................................................................................................... 7-5
D
ESCRIPTION ........................................................................................................................ 7-5
D
IELECTRIC STRENGTH TESTING ....................................................................................... 7-6
LOGIC INPUTS AND OUTPUT RELAYS ...................................................................................... 7-7
L
OGIC INPUTS ...................................................................................................................... 7-7
O
UTPUT RELAYS .................................................................................................................. 7-8
METERING ........................................................................................................................................... 7-9
D
ESCRIPTION ........................................................................................................................ 7-9
C
URRENT INPUTS ................................................................................................................. 7-9
V
OLTAGE INPUT ................................................................................................................... 7-10
T
RANSFORMER TYPE SELECTION ....................................................................................... 7-11
A
MBIENT TEMPERATURE INPUT ......................................................................................... 7-13
A
NALOG OUTPUTS ............................................................................................................... 7-14
T
AP POSITION ...................................................................................................................... 7-15
PROTECTION SCHEMES ................................................................................................................. 7-16
P
RECAUTION ......................................................................................................................... 7-16
H
ARMONIC RESTRAINED PERCENT DIFFERENTIAL .......................................................... 7-16
I
NSTANTANEOUS DIFFERENTIAL PROTECTION ................................................................. 7-23
P
HASE TIME OVERCURRENT ............................................................................................... 7-25
P
HASE INSTANTANEOUS OVERCURRENT 1 ...................................................................... 7-27
P
HASE INSTANTANEOUS OVERCURRENT 2 ...................................................................... 7-28
N
EUTRAL TIME OVERCURRENT .......................................................................................... 7-29
N
EUTRAL INSTANTANEOUS OVERCURRENT 1 ................................................................. 7-31
N
EUTRAL INSTANTANEOUS OVERCURRENT 2 ................................................................. 7-32
G
ROUND TIME OVERCURRENT .......................................................................................... 7-32
G
ROUND INSTANTANEOUS OVERCURRENT 1 .................................................................. 7-35
G
ROUND INSTANTANEOUS OVERCURRENT 2 .................................................................. 7-36
R
ESTRICTED GROUND FAULT POLARITY TEST .................................................................7-36
R
ESTRICTED GROUND FAULT ELEMENT TEST ..................................................................7-37
N
EGATIVE-SEQUENCE TIME OVERCURRENT ..................................................................... 7-39
N
EGATIVE-SEQUENCE INSTANTANEOUS OVERCURRENT ................................................7-42
F
REQUENCY .......................................................................................................................... 7-43
O
VEREXCITATION ................................................................................................................. 7-52
I
NSULATION AGING .............................................................................................................7-54
T
AP MONITOR FAILURE ...................................................................................................... 7-55
AUXILIARY PROTECTION AND MONITORING FUNCTIONS ............................................. 7-56
THD L
EVEL SCHEME .......................................................................................................... 7-56
H
ARMONIC DERATING FUNCTION ..................................................................................... 7-57
T
RANSFORMER OVERLOAD ................................................................................................. 7-58
PLACING THE RELAY INTO SERVICE ......................................................................................... 7-60
P
RECAUTIONS ....................................................................................................................... 7-60
P
ROCEDURE .......................................................................................................................... 7-60
A: APPENDIX CHANGE NOTES ................................................................................................................................ A-1
EVISION HISTORY .............................................................................................................. A-1
R
C
HANGES TO THE 745 MANUAL ...................................................................................... A-2
EU DECLARATION OF CONFORMITY ........................................................................................ A-5
EU D
ECLARATION ...............................................................................................................A-5
GE DIGITAL ENERGY WARRANTY .............................................................................................. A-6
W
ARRANTY STATEMENT ..................................................................................................... A-6
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL TOC–V
B: INDEX
TOC–VI 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
GE
NOTE
WARNING
CAUTION
Grid Solutions
745 Transformer Protection
Chapter 1: Getting Started
Getting Started
1.1 Important Procedures
System
1.1.1 Cautions and Warnings
Please read this chapter to guide you through the initial setup of your new relay.
Before attempting to install or use the relay, it is imperative that all
WARNINGS and CAUTIONS in this manual are reviewed to help
prevent personal injury, equipment damage, and/or downtime.
1.1.2 Inspection Checklist
• Open the relay packaging and inspect the unit for physical damage.
• View the rear nameplate and verify that the correct model has been ordered.
• Ensure that the following items are included:
– Instruction manual
– GE EnerVista CD (includes software and relay documentation)
– Mounting screws
• For product information, instruction manual updates, and the latest software updates,
please visit the GE Multilin website at http://www.GEmultilin.com
Note
If there is any noticeable physical damage, or any of the contents listed are missing,
please contact GE Multilin immediately.
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–1
IMPORTANT PROCEDURES CHAPTER 1: GETTING STARTED
1.1.3 Manual Organization
Reading a lengthy instruction manual on a new product is not a task most people enjoy. To
speed things up, this introductory chapter provides guidelines for basic relay usability.
Important wiring considerations and precautions discussed in Typical Wiring on page 3–7
should be observed for reliable operation. Detailed information regarding accuracy, output
relay contact ratings, and so forth are detailed in Specifications on page 2–5. The
remainder of this manual should be read and kept for reference to ensure maximum
benefit from the 745 Transformer Protection System. For further information, please
consult your local sales representative or the factory. Comments about new features or
modifications for your specific requirements are welcome and encouraged.
Setpoints and actual values are indicated as follows in the manual:
A2 METERING LOSS OF LIFE HOTTEST-SPOT WINDING TEMPERATURE
This ‘path representation’ illustrates the location of a specific actual value or setpoint with
regards to its previous menus and sub-menus. In the example above, the HOTTEST-SPOT
WINDING TEMPERATURE actual value is shown to be an item in the LOSS OF LIFE sub-
menu, which itself is an item in the A2 METERING menu, which is an item of ACTUAL
VALUE S.
Sub-menu levels are entered by pressing the MESSAGE RIGHT or ENTER keys. When inside
a submenu, the MESSAGE LEFT or ESCAPE key returns to the previous sub-menu. The
MESSAGE UP and DOWN keys are used to scroll through the settings in a sub-menu. The
display indicates which keys can be used at any given point.
1–2 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: GETTING STARTED USING THE RELAY
1.2 Using the Relay
1.2.1 Menu Navigation
Press the MENU key to access the header of each menu, which will be displayed in the
following sequence:
SETPOINTS []
ACTUAL VALUES []
TARGET MESSAGES []
To access setpoints, press the MENU key until the display shows the header of the
setpoints menu, and then press the MESSAGE RIGHT or ENTER key to display the header for
the first setpoints page. The setpoint pages are numbered, have an ‘S’ prefix for easy
identification and have a name which provides a general idea of the settings available in
that page. Pressing the MESSAGE UP and DOWN keys will scroll through all the available
setpoint page headers. Setpoint page headers look as follows:
SETPOINTS []
S1 745 SETUP
To enter a given setpoints page, press the MESSAGE RIGHT or ENTER key. Press the
MESSAGE UP or DOWN keys to scroll through sub-page headers until the required message
is reached. The end of a page is indicated by the message
page is indicated by the message
TOP OF PAGE.
END OF PAGE. The beginning of a
To access actual values, press the MENU key until the display shows the header of the
actual values menu, then press the MESSAGE RIGHT or ENTER key to display the header for
the first actual values page. The actual values pages are numbered, have an ‘A’ prefix for
easy identification and have a name, which gives a general idea of the information
available in that page. Pressing the MESSAGE UP or DOWN keys will scroll through all the
available actual values page headers. Actual values page headers look as follows:
ACTUAL VALUES []
A1 STATUS
To enter a given actual values page, press the MESSAGE RIGHT or ENTER key. Press the
MESSAGE UP or DOWN keys to scroll through sub-page headers until the required message
is reached. The end of a page is indicated by the message
page is indicated by the message
TOP OF PAGE.
END OF PAGE. The beginning of a
Similarly, to access additional sub-pages, press the MESSAGE RIGHT or ENTER key to enter
the first sub-page, and then the MESSAGE UP or DOWN keys to scroll through the available
sub-pages, until the desired message is reached. The process is identical for both setpoints
and actual values.
The following procedure illustrates the key sequence to access the Current Demand actual
values.
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–3
USING THE RELAY CHAPTER 1: GETTING STARTED
1. Press the MENU key until you reach the actual values main menu.
ACTUAL VALUES []
2. Press MESSAGE RIGHT or ENTER key to enter the first actual values page, and then the
MESSAGE UP or DOWN key to scroll through pages, until the A2 METERING DATA page
appears.
ACTUAL VALUES []
A2 METERING DATA
3. Press the MESSAGE RIGHT or ENTER key to display the first sub-page heading for the
Metering Data actual values page:
CURRENT []
METERING
Pressing the MESSAGE UP or DOWN keys will scroll the display up and down through the
sub-page headers. Pressing the MESSAGE LEFT or ESCAPE key at any sub-page heading will
return the display to the heading of the corresponding setpoint or actual value page, and
pressing it again, will return the display to the main menu header.
4. Press the MESSAGE DOWN key until the ZERO-SEQUENCE CURRENT METERING subpage heading appears.
ZERO SEQUENCE []
CURRENT METERING
5. At this point, pressing MESSAGE RIGHT or ENTER key will display the messages under
this sub-page. If instead you press the MESSAGE UP key, it will return to the previous
sub-page heading. In this case,
POS. SEQUENCE []
CURRENT METERING
6. When the symbols
and appear on the top line, it indicates that additional sub-
pages are available and can be accessed by pressing the MESSAGE RIGHT or ENTER
key. Pressing MESSAGE RIGHT or ENTER while at the zero-sequence current metering
sub-page heading displays the following:
W1 NEG SEQ CURRENT:
0 A at 0° Lag
Pressing the MESSAGE LEFT key returns to the zero-sequence current metering sub-page
heading.
7. Press the MESSAGE DOWN key to display the next actual value of this sub-page. Actual
values and setpoints messages always have a colon separating the name of the value
and the actual value or setpoint. This particular message displays the current demand
as measured by the relay.
The menu path to the value shown above is indicated as A2 METERING DATA
SEQUENCE CURRENT METERING
W1 NEG SEQ CURRENT. Setpoints and actual values
ZERO
messages are referred to in this manner throughout the manual.
1–4 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: GETTING STARTED USING THE RELAY
1.2.2 Panel Keying Example
For example, the S4 ELEMENTS INSULATION AGING AGING FACTOR LIMIT AGING
FACTOR LIMIT PICKUP
1. Press the MENU key until the setpoints header appears on the display.
SETPOINTS []
path representation describes the following key-press sequence:
2. Press the MESSAGE RIGHT or ENTER key, and then the MESSAGE DOWN key until the
ELEMENTS
SETPOINTS []
S4 ELEMENTS
3. Press the MESSAGE RIGHT or ENTER key to display
INSULATION []
AGING
4. Press the MESSAGE RIGHT or ENTER key to display
AGING FACTOR []
LIMIT
5. Press the MESSAGE RIGHT or ENTER key to reach the
message is displayed.
INSULATION AGING message.
AGING FACTOR LIMIT message.
AGING FACTOR LIMIT PICKUP
S4
message and the corresponding setpoint value.
AGING FACTOR LIMIT
PICKUP: 2.0
6. Press the MESSAGE DOWN key to display the next actual value message as shown
below:
AGING FACTOR LIMIT
DE LAY: 1 0 min .
7. Pressing the MESSAGE UP or DOWN keys scrolls the display up and down through all
the setpoint displays in this corresponding sub-page.
8. Pressing the MESSAGE LEFT key reverses the process described above and returns the
display to the previous level.
AGING FACTOR []
LIMIT
9. Press the MESSAGE LEFT key twice to return to the
SETPOINTS []
S4 ELEMENTS
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–5
S4 ELEMENTS page header.
CHANGING SETPOINTS CHAPTER 1: GETTING STARTED
1.3 Changing Setpoints
1.3.1 Introduction
There are several different classes of setpoints, distinguished by the way their values are
displayed and edited. This section describes how to edit the values used by all setpoint
classes.
Hardware and passcode security features are designed to provide protection against
unauthorized setpoint changes. Since we will be programming new setpoints using the
front panel keys, a hardware jumper must be installed across the setpoint access terminals
(D9 and D10) on the back of the relay case. A keyswitch may also be used across these
terminals to enable setpoint access. Attempts to enter a new setpoint via the front panel
without this connection will be unsuccessful.
1.3.2 Using the HELP Key
Each numerical setpoint has its own minimum, maximum, and increment value associated
with it. These parameters define what values are acceptable for a setpoint.
1. Select the
VOLTAGE
NOMINAL VT SECONDARY
VOLTAGE: 120.0 V
2. Press HELP. The following context sensitive flash message will appear for several
seconds. For the case of a numerical setpoint message, the HELP key displays the
minimum, maximum, and step value.
Range: 60.0
to 120.0 by 0.1
1.3.3 Numerical Setpoints
The following two methods of editing and storing a numerical setpoint value are available.
1. 0 to 9 and the decimal key: The relay numeric keypad works the same as that of any
electronic calculator. A number is entered one digit at a time. The left-most digit is
entered first and the right-most digit is entered last. Pressing the ESCAPE key, before
the ENTER key, returns the original value to the display.
2. VALUE keys: The VALUE UP key increments the displayed value, by the step value, up to
the maximum value allowed. While at the maximum, pressing the VALUE UP key again
will allow setpoint selection to continue from the minimum value. The VALUE DOWN
key decrements the displayed value, by the step value, down to the minimum value.
Again, continuing to press the VALUE DOWN key while at the minimum value will
continue setpoint selection from the maximum value.
S2 SYSTEM SETUP VOLTAGE INPUT NOMINAL VT SECONDARY
setpoint.
1–6 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: GETTING STARTED CHANGING SETPOINTS
As an example, let’s set the nominal VT secondary voltage setpoint to 69.3 V. Press the
appropriate numeric keys in the sequence ‘6 9 . 3‘. The display message will change as
the digits are being entered.
NOMINAL VT SECONDARY
VOLTAGE: 69.3 V
Editing changes are not registered until the ENTER key is pressed. Press the ENTER key to
store the new value in memory. This flash message momentarily appears to confirmation
the storing process. If 69.28 were entered, the value is automatically rounded to 69.3, since
the step value for this setpoint is 0.1.
NEW SETPOINT HAS
BEEN STORED
1.3.4 Enumeration Setpoints
Enumeration setpoints have data values which are part of a set, whose members are
explicitly defined by a name. A set is comprised of two or more members.
Enumeration type values are changed using the VALUE keys. The VALUE UP key displays
the next selection while the VALUE DOWN key displays the previous selection. As an
example we may need to set the phase sequence to ACB. Press the VALUE keys until the
proper selection is displayed.
Editing changes are not registered until ENTER is pressed, storing the new value in
memory. This flash message momentarily appears to confirm the storing process.
1.3.5 Text Setpoints
Text setpoints have data values which are fixed in length, but user defined in character.
They may be comprised of upper case letters, lower case letters, numerals, and a selection
of special characters.
The editing and storing of a text value is accomplished with the use of the decimal, ENTER,
VALUE, and ESCAPE keys. For example:
1. The name for output relay 3 should be more descriptive than the default value. For this
2. Press VALUE keys until the character “I” is displayed in the first position, then press the
PHASE SEQUENCE:
ACB
NEW SETPOINT HAS
BEEN STORED
example let us rename output relay as
INST DIFF TRIP. Press the decimal key and an
underscore (_) will appear at the first character position.
OUTPUT 3 NAME:
T
rip 3
decimal key to store the character and advance the cursor. Change the second
character to a “N” using the VALUE keys and save this change by pressing the decimal
key again. Continue editing all the characters in the text until the string
INST DIFF TRIP
is entered. Note that a space is selected like a character. If a character is entered
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–7
CHANGING SETPOINTS CHAPTER 1: GETTING STARTED
incorrectly, press the decimal key repeatedly until the cursor returns to the position of
the error and re-enter the character as required. Once complete, press ENTER to
remove the solid cursor and save the result.
OUTPUT 3 NAME:
INST DIFF TRIP
1–8 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: GETTING STARTED SECURITY
1.4 Security
1.4.1 Installation
Note that the relay is defaulted to the “Not Programmed” state before it leaves the factory.
This safeguards against the installation of a relay whose setpoints have not been entered.
In addition, a relay in the “Not Programmed” state blocks signaling of any output relay, and
turns off the In Service LED indicator.
Move to the
S1 745 SETUP INSTALLATION 745 SETPOINTS message. To put the relay
in the “Programmed” state, press the VALUE UP or DOWN key once and press ENTER. Enter
“Yes” for the
745 SETPOINTS:
Not Programmed
1.4.2 Changing the Passcode
To guarantee that the relay settings cannot be tampered with, the user may setup the
passcode security feature.
1. Move to the
cannot be edited directly. It simply indicates whether passcode security is enabled
(
SETPOINT ACCESS: “Read Only”), or passcode security is disabled (SETPOINT ACCESS:
“Read & Write”). Each relay is shipped from the factory with setpoint access allowed.
The passcode is also defaulted to '0', which disables the passcode security feature
entirely.
SETPOINT ACCESS:
Read & Write
2. Press the MESSAGE DOWN key once.
CHANGE PASSCODE?
No
ARE YOU SURE? message. The In Service LED indicator will now turn on.
S1 745 SETUP PASSCODE SETPOINT ACCESS message. This message
3. Press the VALUE UP or VALUE DOWN key once.
CHANGE PASSCODE?
Ye s
4. Press the ENTER key to begin the procedure of changing the passcode. The displayed
message will change as shown. The current passcode is '0', so press the '0' numeric
key. The relay will acknowledge the key press by displaying ‘*’.
PLEASE ENTER CURRENT
PASSCODE:
5. Press the ENTER key.
ENTER NEW PASSCODE
FOR ACCESS:
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–9
SECURITY CHAPTER 1: GETTING STARTED
6. For this example, change the passcode to “123” by pressing the appropriate numeric
keys in the ‘1 2 3’ sequence. The message will change as the digits are entered, with
the end result being as shown.
ENTER NEW PASSCODE
FOR ACCESS: ***
7. Press the ENTER key to store the new passcode and a confirmation message appears.
As a safety measure, the relay requires you to enter a new passcode twice. This
ensures the passcode has been entered correctly.
PLEASE RE-ENTER NEW
PASSCODE:
8. After pressing the appropriate numeric keys in the sequence ‘1 2 3’, press ENTER. This
flash message appears momentarily on the display and confirms the new passcode is
stored in memory.
NEW PASSCODE
HAS BEEN STORED
9. After a few seconds, the original display returns.
10. Press the MESSAGE UP key. As soon as a non-zero passcode is entered, setpoint
access will automatically become restricted.
ALLOW ACCESS TO
SETPOINTS? No
1.4.3 Disabling and Enabling Passcode Security
Suppose at some time in the future you want to alter a setpoint. In order to do this, you
must first disable passcode security, make the setpoint change, and then re-enable the
passcode security.
1. Move to message
from here that we will disable passcode security. Please note that this message is
hidden, when the passcode security feature is disabled by entering a passcode of “0”.
ALLOW ACCESS TO
SETPOINTS? No
2. Press the VALUE UP or DOWN key once to select “Yes” and press ENTER. The displayed
message will change as shown.
PLEASE ENTER CURRENT
PASSCODE:
3. Enter the current passcode and press the ENTER key. This flash message indicates
that the keyed in value was accepted and that passcode security is now disabled.
SETPOINT ACCESS
IS NOW ALLOWED
S1 745 SETUP PASSCODE ALLOW ACCESS TO SETPOINTS. It is
1–10 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 1: GETTING STARTED SECURITY
4. This message will appear after a few seconds. Now that setpoint access is enabled,
the
ALLOW ACCESS TO SETPOINTS message has been replaced by the RESTRICT
ACCESS TO SETPOINTS
message. The relay’s setpoints can now be altered and stored.
If no front panel keys are pressed for longer than 30 minutes, setpoint access will
automatically become restricted again.
RESTRICT ACCESS TO
SETPOINTS? No
5. To disable setpoint access, immediately after setpoint editing, move back to message
S1 745 SETUP PASSCODE RESTRICT ACCESS TO SETPOINTS and enter “Yes”. Key
the current passcode into the shown message.
PLEASE ENTER CURRENT
PASSCODE:
6. Press the ENTER key and this message will flash on the display. It indicates that
passcode security is now enabled.
SETPOINT ACCESS
IS NOW RESTRICTED
7. After a few seconds, the original display returns.
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 1–11
SECURITY CHAPTER 1: GETTING STARTED
1–12 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
GE
Grid Solutions
2.1 Introduction
745 Transformer Protection
System
Chapter 2: Overview
Overview
2.1.1 Description
These instructions do not purport to cover all details or variations in equipment nor provide
for every possible contingency to be met in connection with installation, operation, or
maintenance. Should further information be desired or should particular problems arise
which are not covered sufficiently for the purchaser’s purpose, the matter should be
referred to the General Electric company.
To the extent required the products described herein meet applicable ANSI, IEEE, and
NEMA standards; but no such assurance is given with respect to local codes and
ordinances because they vary greatly.
The 745 Transformer Protection System™ is a high speed, multi-processor based, threephase, two or three winding, transformer management relay intended for the primary
protection and management of small, medium and large power transformers. The 745
combines percent differential, overcurrent, frequency, and overexcitation protection
elements along with monitoring of individual harmonics, and total harmonic distortion
(THD) in one economical package.
The relay provides a variety of adaptive relaying features:
• Adaptive harmonic restraint which addresses the problem of false tripping during
inrush
• Adaptive time overcurrent elements which will adjust their pickup settings based on
the calculated transformer capability when supplying load currents with high
harmonic content
• Multiple setpoint groups which allow the user to enter and dynamically select from up
to four groups of relay settings to address the protection requirements of different
power system configurations
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 2–1
INTRODUCTION CHAPTER 2: OVERVIEW
• Dynamic CT ratio mismatch correction which monitors the on-load tap position and
automatically corrects for CT ratio mismatch
• FlexLogic™ which allows PLC style equations based on logic inputs and protection
elements to be assigned to any of the 745 outputs.
The 745 also includes a powerful testing and simulation feature. This allows the protection
engineer the ability to test the relay operation based on captured or computer generated
waveform data which can be converted to a digitized format and downloaded into the
745’s simulation buffer for “playback”. A waveform capture function that records waveform
data for fault, inrush, or alarm conditions is also provided.
The auto-configuration function eliminates the need for any special CT connections by
having all CTs connected in wye.
2.1.2 Protection Features
The following table outlines the protection features available for windings 1, 2, and 3, as
well as the common protection elements.
Symbol Common protection element Symbol Winding 1 protection elements
59/81-1 Volts-per-hertz 1 150/46 Negative sequence instantaneous overcurrent
59/81-2 Volts-per-hertz 2 151/46 Negative sequence time overcurrent
81U-1 Underfrequency 1 150P1 Phase instantaneous overcurrent 1
81U-2 Underfrequency 2 150P2 Phase instantaneous overcurrent 2
81U-R1 Frequency decay rate 1 150N1 Neutral (3I
81U-R2 Frequency decay rate 2 150N2 Neutral (3I
81U-R3 Frequency decay rate 3 150G1 Ground instantaneous overcurrent 1
81U-R4 Frequency decay rate 4 150G2 Ground instantaneous overcurrent 2
81-H5 5th harmonic Level 151P Phase time overcurrent
81O Overfrequency 151N Neutral (3I
87 Differential (percent) 151G Ground time overcurrent
50/87 Instantaneous differential 187TG Ground differential (restricted ground fault)
AN-1 Analog input level 1 1THD Total harmonic distortion level
AN-2 Analog input level 2 1AD Current demand
--- Insulation aging: aging factor, hottest spot limit,
and total accumulated life
--- Tap changer monitor
) instantaneous overcurrent 1
0
) instantaneous overcurrent 2
0
) time overcurrent
0
2–2 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: OVERVIEW INTRODUCTION
Symbol Winding 2 protection elements Symbol Winding 3 protection elements
250/46 Negative sequence instantaneous overcurrent 350/46 Negative sequence instantaneous overcurrent
251/46 Negative sequence time overcurrent 351/46 Negative sequence time overcurrent
250P1 Phase instantaneous overcurrent 1 350P1 Phase instantaneous overcurrent 1
250P2 Phase instantaneous overcurrent 2 350P2 Phase instantaneous overcurrent 2
250N1 Neutral (3I
250N2 Neutral (3I
) instantaneous overcurrent 1 350N1 Neutral (3I0) instantaneous overcurrent 1
0
) instantaneous overcurrent 2 350N2 Neutral (3I0) instantaneous overcurrent 2
0
250G1 Ground instantaneous overcurrent 1 351P Phase time overcurrent
250G2 Ground instantaneous overcurrent 2 351N Neutral (3I
) time overcurrent
0
251P Phase time overcurrent 351G Ground time overcurrent
251N Neutral (3I
) time overcurrent 387TG Ground differential (restricted ground fault)
0
251G Ground time overcurrent 3THD Total harmonic distortion level
287TG Ground differential (restricted ground fault) 3AD Current demand
2THD Total harmonic distortion level
2AD Current demand
FIGURE 2–1: Single line diagram
2.1.3 Order Codes
The order codes for the 745 Transformer Protection System are shown below.
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 2–3
INTRODUCTION CHAPTER 2: OVERVIEW
Table 2–1: 745 order codes
745 – * – * – * – * – * – * – *
Base unit 745 | | | | | | | 745 Transformer Protection System
Windings per
phase
Phase current
input ratings
Ground current
input ratings
Control power LO | | | 20 to 60 V DC; 20 to 48 V AC at 48 to 62 Hz
Options A | | Analog inputs/outputs
Display/Ethernet B | Discontinued: Basic display
Harsh environment H Harsh (chemical) environment conformal coating
W2 | | | | | | Two windings per phase
W3 | | | | | | Three windings per phase
P1|||||Winding 1 = 1 A, Winding 2 = 1 A, Winding 3 = 1 A
P5|||||Winding 1 = 5 A, Winding 2 = 5 A, Winding 3 = 5 A
P15 | | | | | Winding 1 = 1 A, Winding 2 = 5 A
P51 | | | | | Winding 1 = 5 A, Winding 2 = 1 A
P115 | | | | | Winding 1 = 1 A, Winding 2 = 1 A, Winding 3 = 5 A
P151 | | | | | Winding 1 = 1 A, Winding 2 = 5 A, Winding 3 = 1 A
P155 | | | | | Winding 1 = 1 A, Winding 2 = 5 A, Winding 3 = 5 A
P511 | | | | | Winding 1 = 5 A, Winding 2 = 1 A, Winding 3 = 1 A
P515 | | | | | Winding 1 = 5 A, Winding 2 = 1 A, Winding 3 = 5 A
P551 | | | | | Winding 1 = 5 A, Winding 2 = 5 A, Winding 3 = 1 A
G1 | | | | Winding 1/2 = 1 A, Winding 2/3 = 1 A
G5 | | | | Winding 1/2 = 5 A, Winding 2/3 = 5 A
G15 | | | | Winding 1/2 = 1 A, Winding 2/3 = 5 A
G51 | | | | Winding 1/2 = 5 A, Winding 2/3 = 1 A
HI | | | 88 to 300 V DC; 70 to 265 V AC at 48 to 62 Hz
L | | Loss of life
R | | Restricted ground fault
E | Enhanced display, larger LCD, two RS485 ports
T | Enhanced display, larger LCD, one RS485, Ethernet
2–4 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: OVERVIEW SPECIFICATIONS
2.2 Specifications
2.2.1 Applicability
TRANSFORMERS AND FREQUENCY
Transformers:...................................................two-winding or three-winding
Frequency:.........................................................50 or 60 Hz nominal
Frequency tracking:......................................40 to 65 Hz for 0.05 × CT < current ≤ 1 × CT
5 to 65 Hz for current > 1 × CT
2 to 65 Hz for voltage > 50% of VT (only if voltage sensing
is enabled)
2.2.2 Inputs
CONTROL POWER
Options:...............................................................LO/HI (specified when ordering)
LO range:............................................................20 to 60 V DC; 20 to 48 V AC at 48 to 62 Hz
HI range:.............................................................90 to 300 V DC; 70 to 265 V AC at 48 to 62 Hz
Power:..................................................................30 VA nominal, 40 VA maximum
Total loss of voltage ride-through time (0% control power): 16.7 ms
Fuse current rating:.......................................3.15 A (fuse not accessible)
Fuse type: ..........................................................5 × 20 mm slow-blow Littelfuse, high breaking capacity;
model 2153.15
PHASE CURRENT INPUT
Source CT:..........................................................1 to 50000 A primary; 1 or 5 A secondary
Relay input:.......................................................1 A or 5 A (specified at order)
Burden:................................................................less than 0.2 VA at rated load per phase
Conversion range:..........................................0.02 to 46 × CT at 50/60 Hz nominal frequency
Accuracy at < 4 × CT: ...................................±0.25% of 4 × CT (±0.01 × CT) at 50/60 Hz nominal
frequency
Accuracy at ≥ 4 × CT: ...................................±0.5% of 46 × CT (±0.2 × CT) at 50/60 Hz nominal
frequency
Overload withstand:......................................1 second at 80 times rated current; 2 seconds at 40 times
rated current; continuous at 3 times rated current
GROUND CURRENT INPUT
Source CT:..........................................................1 to 50000 A primary, 1 or 5 A secondary
Relay input:.......................................................1 A or 5 A (specified at order)
Burden:................................................................less than 0.2 VA at rated load
Conversion range:..........................................0.02 to 46 × CT
Accuracy at < 4 × CT: ...................................±0.25% of 4 × CT (±0.01 × CT)
Accuracy at ≥ 4 × CT: ...................................±0.5% of 46 × CT (±0.2 × CT)
Overload withstand:......................................1 second at 80 times rated current; 2 seconds at 40 times
rated current; continuous at 3 times rated current
VOLTAGE INPUTS
Source VT:..........................................................2 to 600 kV / 60 to 120 V
Source VT ratio:...............................................1 to 5000 in steps of 1
Relay input:.......................................................60 to 120 V phase-neutral
Burden:................................................................less than 0.025 VA at 120 V
Maximum continuous input: 273 V
Maximum accuracy input: 260 V (full-scale)
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 2–5
SPECIFICATIONS CHAPTER 2: OVERVIEW
Accuracy:...........................................................±2.0% of full-scale
LOGIC INPUTS
Number of inputs: ..........................................16
Dry contacts:....................................................1000 Ω maximum ON resistance (32 V DC at 2 mA
provided by the 745)
Wet contacts:...................................................30 to 300 V DC at 1.5 mA
ANALOG INPUT
Type:.....................................................................DC mA
Ranges:................................................................0 to 1 mA, 0 to 5 mA, 0 to 20 mA, 4 to 20 mA
(programmable)
Input impedance:...........................................375 Ω ±10%
Conversion range:..........................................0 to 21 mA
Accuracy:...........................................................±1% of full scale (based on input range)
TAP POSITION
Type:.....................................................................resistance (ohms)
Range:..................................................................0 to 500 Ω or 0.5 to 5.0 kΩ
Bias current:......................................................1 mA or 10 mA (based on input range)
Accuracy:...........................................................±1% of full scale (based on input range)
RTD
Type:.....................................................................3 wire
RTD Type ............................................................100 Ω Platinum (DIN.43760), 100 Ω Nickel, 120 Ω Nickel
IRIG-B INPUT
Amplitude-modulated:.................................1.0 to 10 V pk-pk
DC shift:...............................................................TTL
Input impedance:...........................................70 to 100 kΩ
2.2.3 Protection Elements
PERCENT DIFFERENTIAL
Operating current pickup: 0.05 to 1.00 × CT in steps of 0.01
Dropout level:...................................................97 to 98% of pickup
Slope 1 range:..................................................15% to 100% in steps of 1
Slope 2 range:..................................................50% to 100% in steps of 1
KP (Slope-1 kneepoint):................................1.0 to 20.0 × CT in steps of 0.1
Harmonic restraint:.......................................0.1 to 65.0% in steps of 0.1
Solid state output operate time:
pickup < 1 × CT: ........................42 to 52 ms
1 × CT < pickup < 1.1 × kneepoint: 34 to 44 ms
pickup > 1.1 × kneepoint:......26 to 36 ms
Relay outputs 2 to 5 operate time:
pickup < 1 × CT:.........................46 to 56 ms
1 × CT < pickup < 1.1 × kneepoint: 38 to 48 ms
pickup > 1.1 × kneepoint:......30 to 40 ms
INSTANTANEOUS DIFFERENTIAL OVERCURRENT
Pickup level:.......................................................3.00 to 20.00 × CT in steps of 0.01
Dropout level:...................................................97 to 98% of pickup
Level accuracy:...............................................per current input
2–6 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: OVERVIEW SPECIFICATIONS
Solid state output operate time:
at 1.2 × pickup: ......................... 22 to 30 ms
at 2.0 × pickup: ......................... 18 to 26 ms
at 4.0 × pickup: ......................... 11 to 19 ms
Relay outputs 2 to 5 operate time:
at 1.2 × pickup: ......................... 28 to 36 ms
at 2.0 × pickup: ......................... 24 to 32 ms
at 4.0 × pickup: ......................... 17 to 25 ms
PHASE / NEUTRAL / GROUND / NEGATIVE SEQUENCE TIME OVERCURRENT
Pickup level: ......................................................0.05 to 20.00 × CT in steps of 0.01
Dropout level:...................................................97 to 98% of pickup
Curve shapes: ..................................................ANSI extremely/very/moderately/normally inverse;
definite time (0.1 s base curve); IEC curve A/B/C and short;
FlexCurve™ A/B/C (programmable curves); IAC extreme/
very/inverse/short
Curve multiplier: .............................................0.00 to 100.00 in steps of 0.01
Reset type:.........................................................instantaneous or linear
Level accuracy:...............................................per current input
Timing accuracy: ...........................................±3% of trip time or ±20 ms (whichever is greater) at ≥ 1.03
× pickup
PHASE / NEUTRAL / GROUND / NEGATIVE SEQUENCE INSTANTANEOUS OVERCURRENT
Pickup level: ......................................................0.05 to 20.00 × CT in steps of 0.01
Dropout level:...................................................97 to 98% of pickup
Time delay:........................................................0 to 60000 ms in steps of 1
Level accuracy:...............................................per current input
Solid state output operate time:
at 1.2 × pickup: ......................... 22 to 30 ms
at 2.0 × pickup: ......................... 18 to 26 ms
at 4.0 × pickup: ......................... 11 to 19 ms
Relay outputs 2 to 5 operate time:
at 1.2 × pickup: ......................... 28 to 36 ms
at 2.0 × pickup: ......................... 24 to 32 ms
at 4.0 × pickup: ......................... 17 to 25 ms
RESTRICTED GROUND FAULT
Number of elements:....................................2
Minimum pickup:............................................0.02 to 20.00 × CT in steps of 0.01
Dropout level:...................................................97 to 98% of pickup
Slope range:......................................................0 to 100% in steps of 1
Pickup delay:....................................................0.00 to 600.00 s in steps of 0.01
Solid-state output operating time:
at 1.1 × pickup: 30 to 50 ms
at 10 × pickup: 20 to 30 ms
(delay set at 0.0 s)
Relay outputs 2 to 5 operating time:
at 1.1 × pickup: 30 to 50 ms
at 10 × pickup: 20 to 30 ms
(delay set at 0.0 s)
UNDERFREQUENCY
Number of elements:....................................2
Operating current pickup: 0.05 to 1.00 × CT in steps of 0.01
Operating voltage pickup: 0.10 to 0.99 × VT in steps of 0.01
Pickup level: ......................................................45.00 to 59.99 Hz in steps of 0.01
Dropout level:...................................................pickup + 0.03 Hz
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 2–7
SPECIFICATIONS CHAPTER 2: OVERVIEW
Time delay:........................................................0.00 to 600.00 s in steps of 0.01
Signal source:...................................................winding 1 phase A current / voltage
Level accuracy:...............................................±0.02 Hz
Solid state output operate time: 39 to 60 ms at 3% beyond pickup (delay set at 0.0 s)
Relay outputs 2 to 5 operate time: 42 to 66 ms at 3% beyond pickup (delay set at 0.0 s)
FREQUENCY RATE OF CHANGE
Number of elements:....................................4
Operating current pickup: 0.05 to 1.00 × CT in steps of 0.01
Operating voltage pickup: 0.10 to 0.99 × VT in steps of 0.01
Pickup level:.......................................................45.00 to 59.99 Hz in steps of 0.01
Dropout level:...................................................pickup + 0.03 Hz
Rate 1/2/3/4: ....................................................0.1 to 5.0 Hz/sec. in steps of 0.1
Dropout level:...................................................pickup + 0.07 Hz/sec.
Signal source:...................................................winding 1 phase A current / voltage
Level accuracy:...............................................±0.02 Hz
Operate time: ...................................................The operate time of this element is variable and is
dependent on the decay rate setting and the supervision
frequency level.
OVERFREQUENCY
Operating current pickup: 0.05 to 1.00 × CT in steps of 0.01
Operating voltage pickup: 0.10 to 0.99 × VT in steps of 0.01
Pickup level:.......................................................50.01 to 65.00 Hz in steps of 0.01
Dropout level:...................................................pickup – 0.03 Hz
Time delay:........................................................0.00 to 600.00 s in steps of 0.01
Signal source:...................................................winding 1 phase A current / voltage
Level accuracy:...............................................±0.02 Hz
Solid state output operate time: 39 to 60 ms at 3% beyond pickup (delay set at 0.0 s)
Relay outputs 2 to 5 operate time: 42 to 66 ms at 3% beyond pickup (delay set at 0.0 s)
OVEREXCITATION ON VOLTS PER HERTZ
Number of elements:....................................2
Operating voltage pickup: 0.10 to 0.99 × VT in steps of 0.01
Pickup level:.......................................................1.00 to 4.00 V/Hz in steps of 0.01
Curve shapes: ..................................................definite time (0.1 second base curve); IEC curve A/B/C
Time delay:........................................................0.00 to 600.00 s in steps of 0.01
Reset delay:.......................................................0.0 to 6000.0 s in steps of 0.1
Signal source:...................................................voltage
Range:..................................................................10 to 65 Hz
Level accuracy: .....................................±0.02 V/Hz
Solid state output operate time: 165 to 195 ms at 1.10 × pickup:
Relay outputs 2 to 5 operate time: 170 to 200 ms (delay set at 0.0 s) at 1.10 × pickup
OVEREXCITATION ON FIFTH HARMONIC LEVEL
Operating current pickup: 0.03 to 1.00 × CT in steps of 0.01
Pickup level:.......................................................0.1 to 99.9 in steps of 0.1%
Dropout:..............................................................95% of pickup
Time delay:........................................................0 to 60000 s in steps of 1 s
Signal source:...................................................all phase currents
Solid state output operate time: 20 to 120 ms at 1.10 × pickup
Relay outputs 2 to 5 operate time: 25 to 125 ms (delay set at 0.0 s) at 1.10 × pickup
2–8 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 2: OVERVIEW SPECIFICATIONS
INSULATION AGING
Hottest spot limit:
Pickup level: ............................... 50 to 300°C in steps of 1
Delay:............................................ 0 to 60000 min. in steps of 1
Aging factor limit:
Pickup level:................................ 1.1 to 10.0 in steps of 0.1
Delay:............................................ 0 to 60000 min. in steps of 1
Loss of life limit:
Pickup level:................................ 0 to 20000 × 10 h in steps of 1
2.2.4 Outputs
ANALOG OUTPUTS
Number of outputs:.......................................7
Output range:...................................................0 to 1 mA, 0 to 5 mA, 0 to 10 mA, 0 to 20 mA, or 4 to 20
mA
Maximum load:................................................10 kΩ at 0 to 1 mA
600 Ω at 4 to 20 mA
Isolation:.............................................................fully isolated
Accuracy:...........................................................±1% of full scale
SOLID STATE OUTPUT
Maximum ratings:..........................................make and carry 15 A at 250 V DC for 500 ms
TRIP RELAYS 2 TO 5
Configuration:..................................................form-A (breaker trip rated)
Contact material:............................................silver alloy
Max. ratings:.....................................................300 V AC, 250 V DC, 15 A, 1500 VA
Make/carry:.......................................................20 A continuous; 40 A for 0.2 s (DC voltage); 80 A for 0.2 s
(AC voltage)
Voltage Break Maximum load
DC resistive 30 V DC 10 A 300 W
125 V DC 0.8 A 300 W
250 V DC 0.4 A 300 W
DC inductive
L/R = 40 ms
AC resistive 120 V AC 20 A 5000 VA
AC inductive
PF = 0.4
30 V DC 5 A 150 W
125 V DC 0.3 A 150 W
250 V DC 0.2 A 150 W
240 V AC 20 A 5000 VA
120 V AC 8 A 5000 VA
240 V AC 7 A 5000 VA
AUXILIARY 6 TO 8 RELAYS, SELF-TEST RELAY 9
Configuration:..................................................form-C
Contact material:............................................silver alloy
Maximum ratings:..........................................300 V AC, 250 V DC, 15 A, 1500 VA
Make/carry:.......................................................10 A continuous; 30 A for 0.2 s
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 2–9
SPECIFICATIONS CHAPTER 2: OVERVIEW
Voltage Break Maximum load
DC resistive 30 V DC 10 A 300 W
125 V DC 0.5 A 62.5 W
250 V DC 0.3 A 75 W
DC inductive
L/R = 40 ms
AC resistive 120 V AC 10 A 2770 VA
AC inductive
PF = 0.4
30 V DC 5 A 150 W
125 V DC 0.25 A 31.3 W
250 V DC 0.15 A 37.5 W
240 V AC 10 A 2770 VA
120 V AC 4 A 480 VA
240 V AC 3 A 750 VA
2.2.5 Miscellaneous
COMMUNICATIONS
All ports:..............................................................300 to 19200 baud, programmable parity, Modbus RTU
protocol, DNP
Ethernet: .............................................................With order code T only,
10Base-T RJ45 connector,
Modbus TCP/IP
Version 2.0 / IEEE 802.3
RS232:..................................................................Front panel,
9-pin D connector
RS485/RS422 (COM1)....................................Back panel
RS485 second port (COM2)........................Back panel, with order code E only.
CLOCK
Resolution:.........................................................1 ms
Accuracy.............................................................±1 ms with IRIG-B
±1 minute/month without IRIG-B
Supercap backup life:...................................45 days when control power is off
HARMONICS
Range:..................................................................0.00 to 99.9%
Accuracy:...............................................±1% of full-scale at 0.5 × CT
THD
Range:..................................................................0.00 to 99.9%
Accuracy:...........................................................±1% of full-scale at 0.5 × CT
EVENT RECORDER
Number of events: .........................................256
Event content:..................................................see Types and causes of events on page 6–19
OPERATING ENVIRONMENT
Operating temperature:.............................. –40°C to +60°C
Storage temperature:...................................–40°C to +80°C ambient
Humidity:............................................................up to 90% non-condensing
Altitude:...............................................................2000 m
Pollution degree:.............................................II
CASE
Drawout:.............................................................Fully drawout unit (automatic CT shorts)
2–10 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
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