Eaton Digitrip 3000 series Installation, Operation And Maintenance Instructions

I.B. 17555D

INSTRUCTIONS FOR INSTALLATION, OPERATION AND MAINTENANCE OF THE CUTLER-HAMMER DIGITRIP 3000 SERIES OF PROTECTIVE RELAYS

Supersedes I.B. 17555C dated November 1999

Effective July 2002

Supersedes I.B. 17555C dated November 1999

Effective July 2002

Supersedes I.B. 17555C dated November 1999

Effective July 2002

Instruction Leaflet DT3000

Page iv Effective: Date 07/02 I.B. 17555D

TABLE OF CONTENTS

SECTION 1: INTRODUCTION......................................................................................................................................................2

1-1 PRELIMINARY COMMENTS AND SAFETY PRECAUTIONS ............................................................................................2

1-1.1 WARRANTY AND LIABILITY INFORMATION..............................................................................................................3

1-1.2 SAFETY PRECAUTIONS .............................................................................................................................................3

1-2 GENERAL INFORMATION .................................................................................................................................................3

1-3 FUNCTIONS/FEATURES/OPTIONS ..................................................................................................................................4

1-4 STANDARDS ......................................................................................................................................................................6

SECTION 2: FUNCTIONAL DESCRIPTION.................................................................................................................................6

2-1 PROTECTION, TESTING AND COMMUNICATION CAPABILITIES ..................................................................................6

2-1.1 RMS SENSING.............................................................................................................................................................6

2-1.2 PICKUP SETTING ........................................................................................................................................................6

2-1.3 TIME SETTING.............................................................................................................................................................7

2-1.4 PROTECTION CURVE SETTINGS ..............................................................................................................................7

2-1.5 INTEGRAL TESTING .................................................................................................................................................11

2-1.6 COMMUNICATIONS ..................................................................................................................................................11

2-2 PROTECTIVE RELAY HARDWARE .................................................................................................................................14

2-2.1 FRONT OPERATIONS PANEL ..................................................................................................................................14

2-2.2 Rear Access Panel......................................................................................................................................................16

2-2.3 EXTERNAL HARDWARE ...........................................................................................................................................18

SECTION 3: OPERATION..........................................................................................................................................................20

3-1 INTRODUCTION ...............................................................................................................................................................20

3-2 POWER-UP AND SELF TESTING....................................................................................................................................20

3-3 PANEL OPERATIONS ......................................................................................................................................................20

3-3.1 CHARACTERISTIC CURVE .......................................................................................................................................20

3-3.2 PROGRAM MODE......................................................................................................................................................26

3-3.3 PROGRAMMING OVERVIEW....................................................................................................................................27

3-3.4 TEST MODE ...............................................................................................................................................................28

3-4 COMMUNICATIONS FUNCTION......................................................................................................................................28

3-4.1 ADDRESS AND BAUD RATE SETTINGS..................................................................................................................29

SECTION 4: APPLICATION CONSIDERATIONS......................................................................................................................29

4-1 ZONE INTERLOCKING CAPABILITIES............................................................................................................................29

SECTION 5: INSTALLATION, STARTUP AND TESTING .........................................................................................................32

5-1 INTRODUCTION ...............................................................................................................................................................32

5-2 PANEL PREPARATION ....................................................................................................................................................32

5-2.1 CUTOUT .....................................................................................................................................................................32

5-2.2 MOUNTING ................................................................................................................................................................32

5-3 REPLACING DIGITRIP MV WITH DIGITRIP 3000 ...........................................................................................................32

5-4 WIRING .............................................................................................................................................................................33

5-5.1 BEFORE POWER APPLICATION ..............................................................................................................................34

5-5.2 INITIAL POWER APPLICATION.................................................................................................................................34

5-6 MISCELLANEOUS TESTING ...........................................................................................................................................34

SECTION 6: MAINTENANCE AND STORAGE..........................................................................................................................34

6-1 GENERAL .........................................................................................................................................................................34

6-1.1 STORAGE ..................................................................................................................................................................34

6-2 TROUBLESHOOTING GUIDE (TABLE 6.1) .....................................................................................................................34

6-3 REPLACEMENT................................................................................................................................................................34

SECTION 7: TIME-CURRENT CURVES ....................................................................................................................................37

7-1 DIGITRIP 3000 INVERSE TIME OVERCURRENT CURVES ...........................................................................................37

7-2 DIGITRIP 3000 CURVE EQUATIONS ..............................................................................................................................61

APPENDIX A ..............................................................................................................................................................................62

A1.0 INTRODUCTION............................................................................................................................................................62

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DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page v

A2.0 GENERAL DESCRIPTION.............................................................................................................................................62

A3.0 INSTALLATION..............................................................................................................................................................62

A3.1 PANEL PREPARATION ..............................................................................................................................................62

A3.2 DIGITRIP 3001 DRAWOUT RELAY PARTS LIST .....................................................................................................62

A3.3 MOUNTING THE DRAWOUT OUTER CASE ............................................................................................................62

A4.0 WIRING AND SETUP ....................................................................................................................................................63

A5.0 APPLICATION CONSIDERATIONS ..............................................................................................................................67

A6.0 DRAWOUT OPERATION ..............................................................................................................................................67

A6.1 INSERTING THE RELAY ............................................................................................................................................67

A6.2 REMOVING THE RELAY ............................................................................................................................................68

APPENDIX B ..............................................................................................................................................................................69

B1.0 INTRODUCTION............................................................................................................................................................69

B2.0 GENERAL DESCRIPTION.............................................................................................................................................69

B3.0 FUNCTIONAL DESCRIPTION.......................................................................................................................................71

B4.0 INSTALLATION..............................................................................................................................................................71

B4.1 PANEL PREPARATION .............................................................................................................................................71

B4.2 MOUNTING THE DIGITRIP 3000 WITH DUALSOURCE POWER SUPPLY .............................................................71

B5.0 WIRING AND SETUP ....................................................................................................................................................73

B6.0 APPLICATION CONSIDERATIONS ..............................................................................................................................73

B6.1 SENSITIVITY AND CT RATIOS .................................................................................................................................73

B6.2 TRIPPING ON FACILITY ENERGIZATION................................................................................................................73

B6.3 CT SATURATION.......................................................................................................................................................73

B6.4 BURDEN DATA.........................................................................................................................................................75

B7.0 TESTING THE DUAL-SOURCE POWER SUPPLY.......................................................................................................75

B7.1 IN-SERVICE TEST.....................................................................................................................................................75

B7.2 LAB BENCH TEST ..................................................................................................................................................... 75

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Supersedes I.B. 17555C dated November 1999

Instruction Leaflet DT3000

Page 2 Effective: Date 07/02 I.B. 17555D

SECTION 1: INTRODUCTION

1-1 PRELIMINARY COMMENTS AND SAFETY PRECAUTIONS

This technical document installation, application, operation, and maintenance of the Cutler-Hammer Digitrip 3000 Family of Protective Relays.

Table 1.1 shows all of the DT3000 Family products that are covered by this Instruction Book.

The DT3001 and DT3031 Drawout Case styles replacement parts can be ordered separately. Please refer to Table 1.2 for a list of these style numbers.

NOTE: THE TERM “DT3000”, AS USED IN THIS INSTRUCTION BOOK I.B. 17555D, IMPLIES TO ALL DT3000 FAMILY PRODUCT STYLES LISTED IN TABLES 1.1 AND 1.2. INDIVIDUAL STYLE NAMES (I.E. DT3030, DT3031, ETC.) WILL BE USED WHERE PRODUCT STYLES DIFFER.

Appendix A and B describe product specifics regarding the DT3000 Drawout Case and the DT3000 Dual Source Power Supply. THE INFORMATION PROVIDED IN THE

APPENDICES SUPERCEDES THAT IN THE MAIN PORTION OF THIS BOOK.

DT3000 NEW

STYLE #

4D13120G21 4D13120G11 DT3000 Protective Relay – Standard FW, HR PS, PM 4D13120G22 4D13120G12 DT3100 Protective Relay – Chicago FW, HR PS, PM 4D13120G24 4D13120G04 DT3030 Protective Relay – Standard FW, LR PS, PM 4D13124G21 4D13124G11 DT3001 Protective Relay – Standard FW, HR PS, DO See Notes 1 4D13124G22 4D13124G12 DT3101 Protective Relay – Chicago FW, HR PS, DO 4D13124G24 4D13124G04 DT3031 Protective Relay – Standard FW, LR PS, DO See Notes 1 4D13125G21 4D13125G11 DT3010 Protective Relay – Standard FW, 120V DS PS, PM See Notes 2 4D13125G22 4D13125G12 DT3020 Protective Relay – Standard FW, 240V DS PS, PM See Notes 2

DT3000 NEW

STYLE #

66D2001G21 66D2001G11 DT3001-IC DT3001 Protective Relay – Inner Case Only See Notes 1 66D2001G22 66D2001G12 DT3101-IC DT3101 Protective Relay – Inner Case Only 66D2001G24 66D2001G14 DT3031-IC DT3031 Protective Relay – Inner Case Only See Notes 1 66D2005G21 66D2005G11 DT3001-OC DT3001 Outer Case Only

DT3000 OLD

STYLE #

DT3000 OLD

STYLE #

TABLE 1.1 DT3000 PROTECTIVE RELAY FAMILY STYLES

CATALOG # DESCRIPTION NOTES

TABLE 1.2 DT3000 DRAWOUT CASE REPLACEMENT PARTS

CATALOG # DESCRIPTION NOTES

For use with DT3XXX-IC Protective Relays

This document is provided as a guide for authorized and qualified personnel only. Please refer to the specific CAUTION in Section 1-1.2 before proceeding. If further information is required regarding a particular installation, application or maintenance activity, please contact a Cutler-Hammer representative.

See Notes 1

Abbreviations: DS PS = Dual Source Power Supply LR PS = Low Range 24-48Vdc Power Supply HR PS = High Range 120-240Vac / 48-250Vdc Power Supply IC = Inner Chassis PM = Panel Mount DO = Draw Out FW = Firmware OC = Outer Chassis

Notes:

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1. Additional product specifications and information in Appendix A.

2. Additional product specifications and information in Appendix B.

Supersedes I.B. 17555C dated November 1999

DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 3

1-1.1 WARRANTY AND LIABILITY INFORMATION

NO WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OF MERCHANTABILITY, OR WARRANTIES ARISING FROM COURSE OF DEALING OR USAGE OF TRADE, ARE MADE REGARDING THE INFORMATION, RECOMMENDATIONS AND DESCRIPTIONS CONTAINED HEREIN.

In no event will Cutler-Hammer be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or otherwise for any special, indirect, incidental or consequential damage or loss whatsoever. Including but not limited to damage or loss of use of equipment, plant or power system, cost of capital, loss of power, additional expenses in the use of existing power facilities or claims against the purchaser or user by its customers resulting from the use of the information and descriptions contained herein.

1-1.2 SAFETY PRECAUTIONS

All safety codes safety standards and/or regulations must be strictly observed in the installation, operation and maintenance of this device.

from dc power only) and provides true rms sensing of each phase and ground current. Only one relay is required per three-phase circuit. An integral part of each device is the

monitoring and the ability to select protective

current functions.

Fig. 1-1 Digitrip 3000 Protective Relay (Front View)

WARNING

THE WARNINGS AND CAUTIONS INCLUDED AS PART OF THE PROCEDURAL STEPS IN THIS DOCUMENTARE ARE FOR PERSONNEL SAFETY AND PROTECTION OF EQUIPMENT FROM DAMAGE. THIS IS AN EXAMPLE OF A TYPICAL WARNING LABEL. THIS WILL HELP TO ENSURE THAT PERSONNEL ARE ALERTED TO CAUTIONS THAT APPEAR THROUGHOUT THE DOCUMENT.

COMPLETELY READ AND UNDERSTAND THE MATERIAL PRESENTED IN THIS DOCUMENT BEFORE ATTEMPTING INSTALLATION, OPERATION OR APPLICATION OF THE EQUIPMENT. ONLY QUALIFIED PERSONS SHOULD BE PERMITTED TO PERFORM ANY WORK ASSOCIATED WITH THE EQUIPMENT. ANY WIRING INSTRUCTIONS PRESENTED IN THIS DOCUMENT MUST BE FOLLOWED PRECISELY. FAILURE TO DO SO COULD CAUSE PERMANENT EQUIPMENT DAMAGE, BODILY INJURY OR DEATH.

THE LOSS OF CONTROL VOLTAGE WILL CAUSE THE DIGITRIP 3000 TO BE INOPERABLE. IF AC CONTROL VOLTAGE IS USED, IF AC CONTROL VOLTAGE IS USED AN APPROPRIATE RELIABLE POWER SOURCE/SCHEME SHOULD BE SELECTED (POSSIBLY AN UPS SYSTEM) TO SUPPLY POWER TO THE RELAY.

The Digitrip 3000 Protective Relay provides protection for most types of medium voltage electrical power distribution systems. It was designed for use with Cutler-Hammer Type VCP-W vacuum circuit breakers, as well as other medium and high voltage circuit breakers. Digitrip 3000 Protective Relays are compatible for use with all circuit breakers utilizing a shunt trip coil.

Thermal curves, plus ANSI and IEC inverse time overcurrent curves provide close coordination with both downstream and upstream protective devices. One Digitrip 3000 Protective Relay replaces the following conventional electromechanical overcurrent relays: 1) an ammeter, 2) a demand ammeter, 3) an ammeter switch, 4) in some situations, a lockout relay switch (device 86).

All Digitrip 3000 Protective Relays include a built-in INCOM communication capability that is compatible with the CutlerHammer PowerNet and IMPACC Systems.

1-2 GENERAL INFORMATION

The Digitrip 3000 Protective Relay is a panel mounted multifunction, microprocessor based overcurrent relay, designed for both ANSI and IEC applications (Figures 1-1 and 1-2). It is a self-contained device that operates from either ac or dc control power (the DT3030 & DT3031 operate

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Supersedes I.B. 17555C dated November 1999

Instruction Leaflet DT3000

Page 4 Effective: Date 07/02 I.B. 17555D

1-3 FUNCTIONS/FEATURES/OPTIONS

The primary function of the Digitrip 3000 Protective Relay is overcurrent protection. This is achieved by analyzing the secondary current signals received from the switch gear current transformers. When predetermined current levels and time delay settings are exceeded, the closing of trip contact(s) is used to initiate breaker tripping.

The Digitrip 3000 Protective Relay operates from the secondary output of standard switch gear current transformers rated at = 5 amperes. It is configured to fit specific distribution system requirements. The phase and ground Ct ratios can be independently programmed over a range of 5:5 to 5000:5. Refer to Table 2.2 for the available Ct ratio settings.

Protective functions can also be configured with the circuit breaker in the open or closed position. The DIP Switch S2, located on the rear of the relay, is used to control closed breaker settings (Figure 1-3). Refer to Paragraph 2-2.2 and Table 5.1 for additional information.

Inverse time overcurrent protection for the phase element cannot be disabled. This insures that all phase protection cannot be disabled. The relay also automatically exits the program mode, if there is no programming activity for 2-1/2 minutes. Programming and test mode security is provided by a sealed, hinged access cover on the front of the relay. Direct reading displays indicate the value currently being considered, while multi-colored LED’s indicate operational conditions and specific functions.

In addition to performing a continuous self-testing of internal circuitry, all Digitrip 3000 Protective Relays include field testing capabilities that are accessible from the front. To check that all tripping features are functioning properly a test current simulates an overload or short circuit condition. Refer to Paragraph 2-1.5 for additional information.

The Digitrip 3000 Protective Relay provides five protective functions for both phase and ground protection:

• Inverse Time Overcurrent Pickup

• Inverse Time Overcurrent Time Multiplier

• Short Delay Pickup

• Short Delay Time

• Instantaneous Pickup

The ground element is capable of a residual, an external source ground or a zero sequence connection. But if ground protection is not desired, it does not have to be connected.

Each of the protective functions is independently programmed for various combinations to fit specific system requirements. For protective functions not required, the relay will allow all of the protective functions on ground and all but the inverse time overcurrent function on phase to be disabled. When the Digitrip 3000 is not set for an instantaneous trip function, a true making current release (discriminator) is available. But if it’s not desired, the discriminator can be disabled.

Fig. 1-2 Digitrip 3000 Protective Relay (Rear and Side Views)

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Supersedes I.B. 17555C dated November 1999

DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 5

Fig. 1-3 Digitrip 3000 Protective Relay with DIP Switches

Shown in Upper Left (Rear View)

By providing 11 different curve shapes the Digitrip 3000 provides greater selective coordination with almost any existing electromechanical overcurrent relay or power fuse. (Figure 1-4).

- Very Inverse

- Extremely Inverse

• lEC Curves (4 shapes per IEC 255-3)

- IEC-A (Moderately Inverse)

- IEC-B (Very Inverse)

- IEC-C (Extremely Inverse)

- IEC-D (Definite Time)

The ground element of Digitrip 3000 can have a curve shape independent of the phase element, providing for a more versatile ground protection.

A pictorial representation of characteristic curve shapes is provided on the face of the relay for reference purposes.

All Digitrip 3000 Protective Relays have zone selective interlocking capabilities for phase and ground fault protection. Zone selective interlocking is a means by which two or more coordinated trip devices can communicate to alter their pre-set tripping modes to provide a faster response for certain upstream fault conditions. The relay is shipped with the zone selective interlocking feature disabled by the use of the two jumpers on the rear mounted terminal strip TB1 (Figure 1-5).

• Thermal Curves (4 shapes)

- It

- I2t

- I4t

- Flat

• ANSI Curves (3 shapes per ANSI C37.112)

- Moderately Inverse

Digitrip 3000 Protective Relays operating parameters and troubleshooting information are displayed on the front of the relay, via the two display windows. This is considered “ON DEVICE” information. In addition, all relay information can be transmitted to a remote location via the built-in INCOM communication system. This type of information is referred to as “COMMUNICATED INFORMATION”.

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Fig. 1-4 Digitrip 3000 Curve Shape Possibilities

Supersedes I.B. 17555C dated November 1999

Instruction Leaflet DT3000

Page 6 Effective: Date 07/02 I.B. 17555D

1-4 STANDARDS

Digitrip 3000 Protective Relays are “Component Recognized” by the Underwriters Laboratory, Inc.® under UL File E154862. Refer to Section 2-3 UL Testing and Specification Summary for more information.

SECTION 2: FUNCTIONAL DESCRIPTION

2-1 PROTECTION, TESTING AND COMMUNICATION CAPABILITIES

2-1.1 RMS SENSING

Digitrip 3000 Protective Relays provide true RMS sensing for proper correlation with the thermal characteristics of conductors and equipment. The root-mean-square (rms) value is determined by a microprocessor calculation of discrete sampled points of the current waveform. This rms value is used for the protection response and metering displays of the relay.

2-1.2 PICKUP SETTING

A Digitrip 3000 Protective Relay pickup setting is a discrete, pre-selected value of current used to initiate a tripping action. The Digitrip 3000 has several current based tripping functions:

Fig. 1-5 Installed Jumpers in Place on Terminal Block

TB-1 Disabling the Zone Interlocking Feature

In addition to being able to provide a circuit breaker “OPEN” or “CLOSED” status to the remote location, the Digitrip 3000 displays and remotely transmits parameters, such as:

• Individual phase currents

• Ground current

• Maximum current for each phase and ground since

last reset (A Demand)

• Magnitude and phase of current causing trip

• Cause of trip

• Current transformer ratio

• Existing set point settings

• Software Version

The remote communications capability is made possible by the Cutler-Hammer Integrated Communications (INCOM) Chip and Protocol which is compatible with the Power-Net Monitor and Control System. Reliable two-way communications can be provided over a twisted pair communications network. The protocol permits a remote master computer to perform:

1) Interrogation of relay data

2) Execution of circuit breaker “Close” and “Trip” commands

3) “Reset” of the relay after a trip

4) Downloading of settings

• Phase inverse time overcurrent tripping - Thermal, ANSI, and IEC Curves.

• Ground inverse time overcurrent tripping - Thermal, ANSI, and IEC Curves.

• Phase and ground short delay tripping.

• Phase and ground instantaneous tripping.

AS SHOWN IN FIGURE 3-2, THE ANSI AND IEC “CURVE SHAPES” ARE IN TERMS OF MULTIPLES OF I

(PICKUP CURRENT OF THE CT PRIMARY),

WHEREAS ‘SHORT DELAY’ AND “INSTANTANEOUS” ARE IN TERMS OF MULTIPLES OF I

(5A SECONDARY

OF CT PRIMARY CURRENT). THE THERMAL CURVE IS REPRESENTED IN TERMS OF MULTIPLES OF I

FOR

ITS CURVE SHAPE, SHORT DELAY, AND INSTANTANEOUS SETTINGS. THIS MUST BE CONSIDERED IN THE COORDINATION STUDY AND IN THE PROGRAMMING OF THE DIGITRIP 3000 PROTECTIVE RELAY.

EXAMPLE: THERMAL CURVES, SHORT DELAY AND INSTANTANEOUS SETTINGS USING I

Ct Rating = In = 1200A Pickup Setting = 1.5 Pickup (amperes) = (1 200)(1 .5)

= 1800A

Example: ANSI and lEC curves using I

Ct Rating = 1200A I

= Pickup Current = 1800A

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Supersedes I.B. 17555C dated November 1999

DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 7

TABLE 2.1 CURVE SELECTION

Curve Type Settings Result

Thermal

ANSI

IEC

Ct Ratio = 1200:5 (Entered as “1200”)

Actual secondary current at pickup=7.5=(1800/1200) x 5

FLAT

MOD

VERY

XTRM

IEC-A IEC-B IEC-C IEC-D

Moderately Inverse

Inverse

Extremely Inverse Definite or Fixed Time Moderately Inverse Very Inverse Extremely Inverse Moderately inverse Very Inverse Extremely Inverse Definite Time

occurs is a function of the current magnitude and the time setting. The delay can be determined from the appropriate time-current curves.

2-1.4 PROTECTION CURVE SETTINGS

Curve Selection: Extensive flexibility on inverse time

overcurrent (phase and ground) curve shaping is possible with eleven available curve types. The selection and associated result is determined by the type of curve shape that best fits the coordination requirements (Figure 1-4, Table 2.1). Different curve shape settings can be applied to phase and ground to maximize coordination flexibility. The curves are discussed in more detail in Paragraph 3-

3.1.

2-1.3 TIME SETTING

A Digitrip 3000 Protective Relay time setting is a preselected time delay initiated when a pickup point on the long or short curve is exceeded. If the current value drops below the pickup value, the timing function resets.

Note: The DT3000 displays pickup settings in the “Settings” window to three significant digits only. If there is a 4th digit in the setting, it will not be displayed in the “Settings” window.

Memory is NOT provided. If the current value does not drop below pickup, the amount of delay before tripping

Phase Inverse Time Overcurrent Pickup: The available pickup settings for the standard DT3000, shown below, range from

0.20 to 2.2 times (In).

Phase Element Inverse Time Overcurrent Pickup –

Available Settings

0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75,

0.80, 0.85, 0.90, 0.95, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70,

1.80, 1.90,2.00,2.10, 2.20

Tolerance Curve #

±5%

The available pickup settings for the Chicago version (DT3100 and DT3101) are shown below, they range from 0.20 to 1.00 times (I

Phase Element Inverse Time Overcurrent Pickup –

0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75,

0.80, 0.85, 0.90, 0.95, 1.00

Available Settings

Tolerance Curve #

±5%

Phase Inverse Time Overcurrent Time Multiplier: The available time settings, shown below, depend on the curve shape selected. For the thermal curves, the settings represent relay operating times at a current value equal to 3 times (In). For ANSI and IEC curves, the settings represent the relay’s time multiplier for the current value equal to I/I

Phase Element Inverse Time Overcurrent Time Multiplier

Available Settings

Curve = IT, I2T, I4T:

0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75,

0.80, 0.85, 0.90, 0.95, 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75,

3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00, 8.50,

9.00, 10.0, 12.5, 15.0, 17.5, 20.0, 22.5, 25.0, 27.5, 30.0, 35.0, 40.0

Curve = FLAT:

0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75,

0.80, 0.85, 0.90, 0.95, 1.00, 1.25, 1.50, 1.75, 2.00

Curve = ANSI MOD, VERY, XTRM:

0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5,

1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0,

3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5,

4.6, 4.7, 4.8, 4.9, 5.0

Tolerance Curve #

+10% See Notes 1 & 2

± 0.05 seconds

±10% See Notes 1 & 2

IT SC-5392-92B

T SC-5391-92B

T SC-5390-92B

FLAT SC 5393-92B

MOD SC-6685-96 VERY SC-6686-96 XTRM SC-6687-96

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Instruction Leaflet DT3000

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Curve = IECA, IECB, IECC, IECD:

0.025, 0.050, 0.075, 0.100, 0.125, 0.150, 0.175, 0.200, 0.225,

0.250, 0.275, 0.300, 0.325, 0.350, 0.375, 0.400, 0.425, 0.450,

0.475, 0.500, 0.525, 0.550, 0.575, 0.600, 0.625, 0.650, 0.675,

0.700, 0.725, 0.750, 0.775, 0.800, 0.825, 0.850, 0.875, 0.900,

0.925, 0.950, 0.975, 1.00

NOTES:

1. Curves go to constant operating time above 30 X In.

2. Tolerance: ± 10% or 0.09 seconds, whichever is larger (>1.5 x I

3. For IECD, the Time Multiplier Tolerance is ±0.05 seconds.

±10% See Notes 1, 2 & 3

). Minimum trip time is 2 power line cycles.

IECA SC-6688-96 IECB SC-6689-96 IECC SC-6690-96 IECD SC-6691-96

Phase Short Delay Pickup: The available pickup settings, shown below, range from 1 to 11 times (In) or NONE. If NONE is selected, the short delay protective function is disabled.

Phase Element Short Delay Pickup

Available Settings

1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00, 3.50, 4.00, 4.50,

5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00, 8.50, 9.00, 9.50, 10.0, 11.0, NONE

Tolerance Curve #

± 10% SC-5394-92B

Phase Short Delay Time: The available time settings, shown below, range from 0.05 to 1.5 seconds at currents equal to or above the short delay pickup setting selected. If NONE was selected for the Phase Short Delay Pickup Setting, the relay will bypass requesting the time setting.

Phase Element Short Delay Time (in seconds)

Available Settings

0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60,

0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95,1.00,1.25, 1.50

Tolerance Curve #

± 0.05 seconds SC-5394-92B

Phase Instantaneous: The available pickup settings, shown below, range from 1 to 25 times (In) or NONE. If NONE is selected, the instantaneous protective function is disabled and a choice of whether to turn the discriminator option on (DON) or off (DOFF) is offered. The discriminator is a true making current release. When the circuit breaker closes, the discriminator function, if selected to be on, is functional in an instantaneous trip mode for 10 cycles after the breaker closes. The breaker will trip instantaneously via the discriminator, if the fault current is above 11 times (I

). After the 10-cycle period has passed, the

discriminator will no longer be functional. It becomes functional again only when the breaker opens and then is re-closed.

INSTANTANEOUS PICKUP

Type Setting Available Settings Tolerance Curve #

DISCRIMINATOR

(IF PHASE INST SET TO NONE)

1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00,

3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50,

8.00, 8.50, 9.00, 9.50, 10.0, 12.5, 15.0, 17.5, 20.0,

22.5, 25.0, NONE D ON Fixed At 11 x In D OFF

± 10% SC-5396-92B

+10%

Ground Fault: After the phase instantaneous setting is established, the ground curve shape, the ground inverse time overcurrent pickup, ground inverse time overcurrent time, ground short delay pickup, ground short delay time and ground instantaneous settings are selected. The available settings are shown below. Note that the ground curve settings are independent of the phase curve and are programmed separately.

Programming the ground settings is done in the same manner as the phase settings, except there is no discriminator option for ground instantaneous, and there is a NONE selection for the inverse time overcurrent pickup setting.

Ground Inverse Time Overcurrent Pickup: The available pickup settings, shown below, range from 0.20 to 2.2 times (I

Ground Element Inverse Time Overcurrent Pickup –

Available Settings

0.100, 0.125, 0.150, 0.175, 0.200, 0.225, 0.250, 0.275, 0.300,

0.350, 0.400, 0.450, 0.500, 0.550, 0.600, 0.650, 0.700, 0.750,

0.800, 0.850, 0.900, 0.950, 1.00, 1.25, 1.50, 1.75, 2.00, NONE

Tolerance Curve #

+ 5%

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DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 9

Ground Inverse Time Overcurrent Time Multiplier: The available time settings, shown below, depend on the ground curve shape setting selected. For the thermal curves, the settings represent relay operating times at a current value equal to 3 times (I

). For ANSI and IEC curves, the settings represent the relay’s time multiplier for the current value equal to I/Ipu.

Ground Element Inverse Time Overcurrent Time Multiplier

Available Settings

Curve = IT, I2T, I4T:

0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75,

0.80, 0.85, 0.90, 0.95, 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50, 2.75,

3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00, 8.50,

9.00, 10.0, 12.5, 15.0, 17.5, 20.0, 22.5, 25.0, 27.5, 30.0, 35.0, 40.0

Curve = FLAT:

0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75,

0.80, 0.85, 0.90, 0.95, 1.00, 1.25, 1.50, 1.75, 2.00

Curve = ANSI MOD, VERY, XTRM:

0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5,

1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0,

3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5,

4.6, 4.7, 4.8, 4.9, 5.0

Curve = IECA, IECB, IECC, IECD:

0.025, 0.050, 0.075, 0.100, 0.125, 0.150, 0.175, 0.200, 0.225,

0.250, 0.275, 0.300, 0.325, 0.350, 0.375, 0.400, 0.425, 0.450,

0.475, 0.500, 0.525, 0.550, 0.575, 0.600, 0.625, 0.650, 0.675,

0.700, 0.725, 0.750, 0.775, 0.800, 0.825, 0.850, 0.875, 0.900,

0.925, 0.950, 0.975, 1.00

NOTES:

1. Curves go to constant operating time above 30 X In.

2. Tolerance: ± 10% or 0.09 seconds, whichever is larger (>1.5 x I

3. For IECD, the Time Multiplier Tolerance is ±0.05 seconds.

4. For Ground Pickup ≤0.2pu: trip time tolerance is ±15%.

Tolerance Curve #

±10% See Notes 1, 2 & 5

±0.05 seconds

±10% See Notes 1, 2 & 4

±10% See Notes 1, 2, 3 & 4

). Minimum trip time is 2 power line cycles.

IT SC-5401-92B I2T SC-5400-92B I4T SC-5399-92B

FLAT SC-5402-92B

MOD SC-6685-96 VERY SC-6686-96 XTRM SC-6687-96

IECA SC-6688-96 IECB SC-6689-96 IECC SC-6690-96 IECD SC-6691 -96

Ground Short Delay Pickup: The available pickup settings, shown below, range from 0.100 to 11 times (In) or NONE. If NONE is selected, the short delay protective function is disabled.

Ground Element Short Delay Pickup

Available Settings

0.100, 0.125, 0.150, 0.175, 0.200, 0.225, 0.250, 0.275, 0.300,

0.350, 0.400, 0.450, 0.500, 0.550, 0.600, 0.650, 0.700, 0.750,

0.800, 0.850, 0.900, 0.950, 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50,

2.75, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00,

8.50, 9.00, 9.50, 10.0, 11.0, NONE

Tolerance Curve #

+ 10% SC-5403-92B

Ground Short Delay Time: The available time settings, shown below, range from 0.05 to 1.5 seconds at currents equal to or above the short delay pickup setting selected. If NONE was selected for the Phase Short Delay Pickup Setting, the relay will bypass requesting the time setting.

Ground Element Short Delay Time (in seconds)

Available Settings

0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60,

0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.25, 1.50

Tolerance Curve #

+ 0.05 seconds SC-5403-92B

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Supersedes I.B. 17555C dated November 1999

Instruction Leaflet DT3000

Page 10 Effective: Date 07/02 I.B. 17555D

Ground Instantaneous: The available pickup settings, shown below, range from 0.50 to 11times (In) or NONE. If NONE is selected, the instantaneous protective function is disabled.

Ground Element Short Delay Time

(in seconds)

AVAILABLE SETTINGS

0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.25,

1.50, 1.75, 2.00, 2.25, 2.50, 2.75, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50,

6.00, 6.50, 7.00, 8.00, 8.50, 9.00, 9.50, 10.0, 11.0, NONE

TABLE 2.2 MISCELLANEOUS SETTINGS

TYPE SETTING AVAILABLE SETTINGS

HIGHLOAD TIME

(pickup fixed @ 0.85 X Phase Time Overcurrent Setting)

FREQUENCY PHASE CT RATIO

GROUND CT RATIO

TEST

Phase Trip

Ground Trip

Phase

Ground

Tolerance Curve #

+ 10% SC-5396-92B

0 Sec, 5 Sec, 10 Sec, 30 Sec, 1 min, 2 min, 5 min

5 min (Chicago version)

50 Hz, 60 Hz 5,10, 25, 50, 75,100,150, 200, 250, 300, 400, 500, 600, 630, 800, 1000, 1200, 1250, 1500, 1600, 2000, 2400, 2500, 3000,3200, 4000, 5000 5,10, 25, 50, 75,100,150, 200, 250, 300, 400, 500, 600, 630, 800, 1000, 1200, 1250, 1500, 1600, 2000, 2400, 2500, 3000,3200, 4000, 5000

P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P12, P14, P16 P18, P20, P22, P25

P3T, P10T, P25T

G.1, G.2, G.3, G.4, G.5, G.6, G.7, G.8, G.9, Gi, G2, G3, G4,G5, G6, G8, G10

G1T, G3T, G10T

Table 2.3 Factory Set Defaults

Dip Switch Settings

Type Default Setting

S1 ON (Digitrip 3000 IMPACC Buffers) S2 OFF (Program with Breaker Open

Only)

S3 OFF (Standard Relay Configuration –

OC/Instantaneous)

S4 OFF (Enable Remote Open/Close) S5 OFF (Communications Close) S6 OFF (Zone Interlocking Unlatched) S7 OFF (52b Breaker Input Mode) S8 OFF (Disable Download Set Points) S9 OFF (Manual Reset)

S10 OFF Reserved

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Phase Settings

Type Default Setting

Curve Shape It

T (Chicago version)

LDPU 1.0

LDT 5 seconds

40 seconds (Chicago version)

SDPU 1.5

11 (I

) (Chicago version)

SDT 1.0 seconds

1.5 seconds (Chicago version)

INST 1.75

25 (I

) (Chicago version)

Ground Settings

Type Default Setting

Curve Shape It

LDPU 0.5

2.0 (I

) (Chicago version)

LDT 5 seconds

40 seconds (Chicago version)

SDPU 0.75

11 (I

) (Chicago version)

SDT 1.0 seconds

1.5 seconds (Chicago version)

INST 1.0

11 (I

) (Chicago version)

DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 11

N.O. contacts at terminals TB2-4 and 5. These events are reset when the current drops below the 85% level.

System Frequency Selection: Either 60Hz or 50Hz may be selected.

Phase and Ground Ct Ratio Selection: The available Ct ratios, shown in the above table range from 5:5 to 5000:5.

Defaults: In the unlikely event that settings are missed or entered incorrectly, the Operational LED will blink Red and the relay will display “PRGM” in the Settings Display window. This means the program settings should be reentered and saved.

2-1.5 INTEGRAL TESTING

Digitrip 3000 Protective Relays have a front accessible, integral field testing capability. This feature introduces a selected level of internal test current to simulate an overload or short circuit. It checks proper functioning of the relay and verifies that curve settings have been set-up correctly.

The integral test function provides selectable ‘Trip’ and ‘No Trip’ test settings for both phase and ground testing. Refer to the above tables for available test settings. The ‘P’ used refer to a phase current test setting, while the ‘G’ refers to a ground current test setting. ‘T’ in the table means that the test will initiate a breaker trip. All settings are in per unit current values times the I rating.

value, which is the selected Ct

Miscellaneous Settings

Type Default Setting

DISC OFF

HILD 10 seconds

FREQ 60 Hz

CT P 500

CT G 500

High Load: The available high load time-out settings are shown in the tables above. At a current 85% or above the inverse time overcurrent phase setting value, the high load function will begin timing to the time setting selected and the High Load LED will blink. If the current drops below the 85% value, the high load timer will reset, and only start again when the 85% value is again reached. When the High Load Timer times out three coinciding events occur:

1. The “High Load” LED on the front of the relay lights continuously,

2. An alarm signal is sent over the communications network, and

3. If DipSwitch #5 is in the “On” position, the high load alarm also closes the Communications Close Relay

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THE TEST MODE SHOULD NOT BE USED TO TRIP LIVE CURRENT CARRYING CIRCUITS. IF A LIVE CURRENT OF GREATER THAN 0.1 TIMES THE VALUE IS FLOWING IN EITHER A PHASE OR GROUND CIRCUIT, THE TEST MODE IS AUTOMATICALLY EXITED, ACCOMPANIED BY AN ERROR MESSAGE IN THE SETTINGS/TEST TIME/TRIP CAUSE WINDOW.

2-1.6 COMMUNICATIONS

An important function of the Digitrip 3000 Protective Relay is communications and control via the Cutler-Hammer PowerNet Protocol. It allows the combining of electrical distribution and control products with personal computers into a comprehensive communications and control network.

The Digitrip 3000’s communications chip permits the interrogation of relay data, remote tripping and closing of breaker, the Reset of the relay after a trip, and downloading of set points from a remote master computer.

Note: Dip Switch #5 must be in the “Off” position to initiate a “Communications Close” command.

Communications is accomplished from the relay to the master computer via a 115.2 kHz frequency carrier signal

Instruction Leaflet DT3000

Page 12 Effective: Date 07/02 I.B. 17555D

over a shielded twisted pair of conductors. The receiving terminal is a remote mounted master computer (IBM compatible). Refer to Figure 2-1 for a typical communications wiring diagram. Ground shielding

should be provided at one place only, with the computer end being the recommended location.

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Supersedes I.B. 17555C dated November 1999

DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 13



1 2 3 4





















Fig. 2-1 Typical Communications Wiring Diagram



FOR NETWORK INTERCONNECTION CABLE, SEE CABLE SPECIFICATIONS ON FIGURE 3-1.

 REFER TO CIRCUIT BREAKER WIRING DIAGRAMS FOR ACTUAL CONNECTIONS.  CARBON COMPOSITION RESISTOR MUST BE INSTALLED ON THE MOST REMOTE DEVICDE AS SHOWN:

- 150 OHM, ½ WATT FOR 1200 BAUD RATE COMMUNICATIONS.

- 100 OHM, ½ WATT FOR 9600 BAUD RATE COMMUNICATIONS.

 A CUTLER-HAMMER CONI (COMPUTER OPERATED NETWORK INTERFACE) OR CONI-3 CARD MUST BE INSERTED INTO

THE COMPUTER ISA BUS.

 CUSTOMER TO SUPPLY A COMPUTER AND MODULAR TELEPHONE CONNECTOR TYPE RJ11 AND WIRE PER VIEW A.  GROUND SHIELDING AT ONE PLACE ONLY (COMPUTER END RECOMMENDED).  WHERE DEVICES ARE DAISY CHAINED, TIE SHIELDING TOGETHER FOR END-TO-END CONTINUITY, SOME PRODUCTS

WILL PROVIDE AN EXTRA TERMINAL FOR A TIE POINT FOR THE CABLE SHIELD LEADS.

 CIRCUIT BREAKER TRUCK OPERATED CELL TOC SWITCH (SHOWN FOR CIRCUIT BREAKER IN “CONNECTED” POSITION)

IS OPTIONAL TO AUTOMATICALLY DISCONNECT RELAY FROM THE COMMUNICATION NETWORK WHEN CIRCUIT BREAKER IS IN THE “TEST” POSITION.

 LAST DEVICE IN NETWORK, TIE BACK SHIELD AND TAPE.  WHEN TOC SWITCH IS USED, DOWNLOADING OF PROTECTION SETTINGS FROM THE COMPUTER WILL NOT BE

POSSIBLE WITH BREAKER IN THE “TEST” POSITION.

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Instruction Leaflet DT3000

Page 14 Effective: Date 07/02 I.B. 17555D

2-2 PROTECTIVE RELAY HARDWARE

2-2.1 FRONT OPERATIONS PANEL

The operations panel, which is normally accessible from the outside of the switch gear panel door, provides a means to program, monitor and test the unit (Figure 1-1). For the purpose of familiarization, the panel is divided into three sub-sections:

1. Pushbuttons

2. LED’s

3. Display Windows

Pushbuttons: The front operations panel supports eleven membrane pushbuttons. Pushbuttons are color coded (red, white, blue and yellow) by their function. For example, blue pushbuttons are associated with actual program functions, yellow pushbuttons with integral testing functions, and white pushbuttons are common to both operations or are independent. White pushbuttons accomplish their function when depressed. They can be held down and not released to accelerate their function. Blue and Yellow pushbuttons accomplish their function after having been pressed and released.

Reset Pushbutton (Blue)

The Reset pushbutton is used to reset any of the following: the trip relays (overcurrent and instantaneous), the trip alarm relay, the trip LED’s, and the ampere demand current. Reset applies to both normal operations and integral testing. If the unit is in the auto-reset mode, as set by DIP switch #9 on the back of the unit, the trip relays and the trip alarm relay will automatically reset when the circuit breaker is opened after a trip.

Program Mode Pushbutton (Blue)

The Program Mode pushbutton, which is accessed by opening, hinged access cover, is used to enter and exit the program mode. When this pushbutton is pressed and released, the program LED flashes and set points can be altered.

DIP Switch S2 establishes when the Program Mode can be entered. With S2 set to “off,” the Program Mode can only be entered when the breaker is open. With S2 set to “on,” the Program Mode can be entered with the breaker open or closed.

Selections made in the program mode are only saved when the Save Settings pushbutton, which is described later, is depressed. When programming is concluded, the Program Mode pushbutton should be pressed to exit the program mode. Note that if the Save Settings pushbutton is not depressed prior to exiting the program mode, the previous settings will be retained. The program mode is also exited if the Reset pushbutton is pressed or if there is no programming activity for approximately 2-1/2 minutes.

Note: Each Digitrip 3000 is shipped from the factory with nominal protection settings. The user should program the relay before putting it into service, as

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Supersedes I.B. 17555C dated November 1999

these nominal values may not give optimum system protection or coordination.

Test Mode Pushbutton (Yellow)

Also located behind the sealed hinged access cover is the Test Mode pushbutton. This pushbutton is used to enter and exit the test mode. When the pushbutton is pressed and released, the word TEST will appear in the Settings/Test Time/Trip Cause display window. If there is more than 0.1 times (I

) current flowing in either the phase

or the ground circuit, the Test Mode cannot be initiated and the error message “ERR” will appear in the display window. The test mode will automatically exit if there is no activity for approximately 2-1/2 minutes.

Select Test Pushbutton (Yellow)

The Select Test pushbutton is used, after the test mode has been entered, to select the type of test. There are phase and ground tests to trip or not trip the breaker (See Section 3-3.4).

Test Pushbutton (Yellow)

The selected test operation is initiated by pressing and releasing the Test pushbutton.

Select Settings Pushbutton (Blue)

In the program mode, the Select Settings pushbutton is used to step to the next set point. This pushbutton steps forward. To step back, the Select Settings pushbutton can be pressed and held, while pressing and releasing the Lower pushbutton.

Raise/Lower Pushbutton (White)

The Raise and Lower pushbuttons are used during the program and test modes to increase or decrease the value of the displayed set point.

Save Settings Pushbutton (Blue)

While in the program mode, selected Set Points can be saved by pressing and releasing the Save Settings pushbutton. Settings can be saved individually or as a group. If the Save Settings pushbutton is not used, the previous Set Points will remain when the program mode is exited.

View Settings Pushbutton (Blue)

The View Settings pushbutton is only functional when the unit is in the normal operating mode. It displays the unit’s set point including the phase and ground current transformer ratio selected via programming. The software version of the DT3000 will be displayed after the ground Ct ratio setting, and will appear in the rms Amperes display window with the letters “SVER”.

Select Pushbutton (White)

The Select pushbutton is used to step between any of the eight current values that are displayed in the rms ampere window. The eight currents are IA, IB, IC, IG, IA ampere demand, lB ampere demand, IC ampere demand, and IG ampere demand. The currents displayed are the present rms values. The ampere demand currents are the averaged RMS values sensed over a 5-minute period of

DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 15

time. The demand value is the largest 5-minute average measured since the ampere demand was last reset.

LED: LED’s are used to indicate a number of functions, operations and/or warnings. Many of the LED’s provide different indication messages. The color and a constant on or blinking operation determines the specific message. Several of the LED’s are bi-colored and can be lit green or red.

Operational LED

The Operational LED at the top of the relay should be green and blink on for approximately one second and then off for one second. This indicates that the relay is functioning properly in its normal operation mode. If this LED is blinking red, it indicates the relay may need reprogramming. If this LED is lit in any color shade other than a definite green or red, or if it is not blinking at all, an internal problem has been detected requiring replacement of the relay.

High Load LED

The High Load LED will blink green when high load settings are being selected in the program mode. The High Load LED will blink red (in operational or test modes) when a load current reaches 85% or reaches above the inverse time overcurrent phase pick-up setting. If the load current remains at 85% or remains above the inverse time overcurrent phase pickup setting for the time interval setting, the LED will change to steady red at the end of the time interval. Whenever the load current drops below the 85% level, the timer will reset and the LED will turn off.

multiplier is being viewed in the unit’s normal operating mode, the LED is a constant green.

Short Delay Setting LED

This LED is bi-colored and operates like the time overcurrent setting LED.

Short Delay Time LED

The short delay time LED, when lit is green, and operates like the inverse time overcurrent time LED.

Instantaneous LED

This LED is bi-colored and operates like the inverse time overcurrent setting LED.

Phase LED

The phase LED is bi-colored. The LED will blink green when the phase inverse time overcurrent setting, inverse time multiplier, short delay setting, short delay time, and instantaneous Set Points are displayed in the Settings/Test Time/Trip Cause window while in the program mode. When these Set Points are viewed in the normal operating mode, this LED will be a constant green. The LED will blink red, along with the time overcurrent setting LED, when the phase load current exceeds the inverse time overcurrent pickup set point. The LED will be a constant red, when the phase inverse time overcurrent initiates a trip, a short delay, or instantaneous protective functions.

Ground LED

The ground LED is also bi-colored and operates exactly like the phase LED for all functions associated to ground.

Communication Trip LED

This LED will be a constant red when the master computer has tripped the breaker via INCOM. The LED will turn off when the Reset pushbutton is pressed or the circuit breaker is re-closed.

Curve Shape LED

This LED will blink green when the slope set point is displayed in the Settings/Test Time/Trip Cause window while in the program mode. When the curve shape set point is being viewed in the unit’s normal operating mode, this LED will be a continuous green.

Time Overcurrent Setting LED

This LED is bi-colored. While in the program mode, the LED will blink green when the inverse time overcurrent pickup set point is displayed in the Settings/Test Time/Trip Cause window. It will be a constant green when the inverse time overcurrent pickup set point is being viewed in the unit’s normal operating mode. The LED will blink red whenever the load current exceeds the inverse time overcurrent pickup set point. If the relay trips on inverse time overcurrent, the LED will be continuous red.

Inverse Time Overcurrent Time LED

This LED will blink green, while in the program mode, when the LED time overcurrent time set point is displayed in the Settings/Test Time/Trip Cause window. When the time

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Ampere Demand LED

This LED will be a constant green when an ampere demand current is being viewed in the rms ampere window.

, IB, IC, IG LED’s

The specific phase or ground current LED’s will be a constant green when that phase or ground current is being displayed in the rms ampere window. When the Ampere Demand LED is also lit, the displayed current is the Ampere Demand Current.

Program LED

This LED is a constant green when the relay is in the program mode.

Test LED

This LED is a constant green when the relay is in the test mode.

Display Windows: Two windows are used to display the relay’s data, Set Points and messages. One window is located in the upper portion of the relay’s faceplate and is labeled RMS Amperes. A second window is located in the lower portion of the faceplate adjacent to the program and test LED’s. It is labeled Settings/Test Time/Trip Cause.

RMS Amperes Window

This window has a five digit numeric display and shows:

Instruction Leaflet DT3000

Page 16 Effective: Date 07/02 I.B. 17555D

1. The present phase or ground currents.

2. The largest phase or ground demand currents since last reset.

3. The fault current (displayed after a trip until a reset action is initiated).

4. The phase and ground current transformer Ct setting (when “View Settings” pushbutton is used with the relay in the normal operating mode).

Settings/Test Time/Trip Cause Window

This window is a four character alphanumeric display used to show the value of the Set Points, the test time and the cause of trip.

2-2.2 REAR ACCESS PANEL

WARNING

THE BACK OF DIGITRIP 3000, WHEN ENERGIZED, OFFERS EXPOSURE TO LIVE PARTS WHERE THE HAZARD OF A FATAL ELECTRIC SHOCK IS PRESENT. ALWAYS DISCONNECT SOURCE AND CONTROL POWER SUPPLY BEFORE TOUCHING ANYTHING ON THE REAR OF THE DIGITRIP 3000. FAILURE TO DO SO COULD RESULT IN INJURY OR DEATH.

The rear access panel of Digitrip 3000 is normally accessible from the rear of an open panel door. All wiring connections to the Digitrip 3000 Protective Relay are made at the chassis’ rear. For the sake of uniform identification, the frame of reference used when discussing the rear access panel is facing the back of the relay. The DIP switches, for example, are located on the upper left of the rear panel (Figure 1-3). Become familiar with the functions and connections involved, especially the following:

DIP Switches: A set of ten DIP switches is located in the upper left portion of the rear panel. Refer to Table 5.1 for DIP switch positions. Their basic functions are as follows:

• Switch S1 is used to select whether the IMPACC buffers are set for the Digitrip 3000 configuration or the Digitrip MV configuration. (Refer to Section 5: for configuring the Digitrip 3000 as a replacement for a Digitrip MV.)

• Switch S2 is used to enable/disable the ability to program the Set Points when the breaker is in the open or closed position. CARE MUST BE TAKEN WHEN PROGRAMMING THE DIGITRIP 3000 WHILE THE BREAKER IS CLOSED AND CURRENT IS FLOWING. AN INCORRECT SETTING CONFIGURATION COULD CAUSE THE RELAY TO TRIP THE BREAKER WHEN SETTINGS ARE SAVED.

• Switch S3 is used to configure the trip contacts as shown below:

Trip

Contacts

TB 12 & 13 Phase & Ground

TB 14 & 15 Phase & Ground

Dip Switch OFF

Position

Trip Inst.

Trip

OC/Communications

Dip Switch ON

Position

Ground Trip Inst./OC

Phase Trip Inst./OC/

Communications

• Switch S4 is used to enable/disable the ability to open or close the breaker remotely from the communications interface (host computer).

• Switch S5 is used to configure the Communication Close output relay at terminals TB2-4 & TB2-5. When S5 is in the “On” position the output relay is programmed for High Load Alarm. When S5 is in the “Off” position the output relay is programmed for Communications Close.

• Switch S6 is used to configure the zone interlock input. When the “Zone Input” switch S6 is in the “On” position, the zone interlock input is latched for compatibility with low voltage trip units as in the existing DT3000. The latched Zone Interlock option will not execute a Zone Interlock Fast Trip until the downstream relay stops sending the zone interlock signal and the current drops below the pickup level settings. When switch S6 is in the “Off” position, the zone interlock input is unlatched for faster tripping. The unlatched Zone Interlock option executes Zone Interlock Fast Trip when the downstream relay stops sending the zone interlock signal. Use the latched option for co-ordination with self-powered trip units. Self-powered trip units stop sending the zone interlock signal when the trip signal is issued. Latching of the DT-3000 zone interlock input provides the needed coordination time for the downstream breaker to open.

• Switch S7 is used to select between a 52a and a 52b input to determine breaker state. When S7 is in the “On” position, the breaker status is based on the 52a input. When S7 is in the “Off” position, the breaker status is based on the 52b input. The OFF/52b configuration is the default mode. The breaker state determination is used for the following purposes in the DT3000:

1. Test the number of cycles the breaker has been

closed for Discriminator operation.

2. Determine the breaker state for setting change

permission if S2 is set to “Program with Breaker Open Only”.

3. Report breaker state to PowerNet.

The 52b contact is open when the breaker is closed and closed when the breaker is open. The 52a contact is closed when the circuit breaker is closed and open when the breaker is opened or racked out. The 52a option has the benefit of properly reporting breaker state when the circuit breaker is racked out.

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DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 17

• Switch S8 is used to enable/disable the ability to download Set Points from the communication interface (host computer).

• Switch S9 is used to select whether the relay should be self-reset or manually reset (lock out function). For additional information please refer to the “Manual Reset”

and “Auto Reset’ sections.

In the manual reset mode the Trip Instantaneous contact (TB2 12 and 13), Trip Overcurrent contact (TB2 14 and 15) and the Trip Alarm contact (TB2 6, 7 and 8) change state after a protection trip operation. The contacts stay in that state until the “Reset” Pushbutton is pressed. In addition, the front panel will hold the cause of trip in the “Trip Cause” window and the fault current magnitude in the “RMS Ampere” window. A RESET COMMAND can be sent to the Digitrip 3000 by a master computer to remotely reset the Digitrip 3000.

In the auto reset mode the Trip Instantaneous contacts (TB2 12 and 13), or Trip Overcurrent contacts (TB2 14 and 15) are momentarily closed after a protection trip operation. The contacts will remain closed until the current drops below 0.5 A. The Trip Alarm Relay, however, remains energized until the “Reset” Pushbutton is depressed or a RESET COMMAND is received from a communication system master. In this mode after a trip is initiated and the current is removed, the display will BLINK the cause of the trip in the “Trip Cause” window and the “RMS Ampere” window will show the fault current magnitude. Both displays clear when current is reapplied.

Terminals 11 and 12 are used for ground zone interlocking, inverse time overcurrent protection and short delay protection. The zone interlocking function is a low level dc signal used to coordinate with “downstream” and “upstream” breakers that see or do not see the fault. If the function is not used but an inverse time overcurrent or short delay time is desired, the two terminals should stay jumpered as they were when shipped from the factory.

Terminals 13 and 14 are used for phase zone interlocking, inverse time overcurrent protection and short delay protection.

Terminal 15 is the zone signal common. Zone common should never be connected to earth ground. Refer to Figure 4-1 for a typical phase zone interlocking / wiring scheme.

NOTE: DIGITRIP 3000 PROTECTIVE RELAYS ARE SHIPPED WITH A PHASE ZONE INTERLOCKING JUMPER (ACROSS TERMINALS TB 1-13 AND 14) AND A GROUND ZONE INTERLOCKING JUMPER (ACROSS TERMINALS TB 1-11 AND 12). FOR PHASE OR GROUND ZONE CAPABILITY, THE RESPECTIVE JUMPERS MUST BE REMOVED.

Terminal Block Two (TB2): TB2 is located on the right

side of the rear panel and is numbered 1 through 15.

Terminals 1 and 2 are used for the internal INCOM communications interface.

Terminal 3 is used to reference the INCOM cable shield. It is capacitively tied to ground for high frequency noise immunity purposes.

• Switch S10 is reserved.

Inverse Time Overcurrent Reset: The inverse-time overcurrent function in the DT3000 requires the measured current to be below pickup for 4 cycles before the trip accumulator is reset. The multi-cycle reset counter eliminates concern that the integration will reset during an arcing fault and slow down tripping.

Communicating LED: A red LED just above terminal block (TB2) is used when the relay is communicating. If the relay is the type designed to accept field installation of a communication module at a later date, this LED is not functional at any time.

Terminal Block One (TB1): TB1 is located on the left side of the rear panel, and is numbered 1 through 15, with 1, 2, 3, 7 and 8 not used. Terminals 5 and 6 are provided for the AC or DC input control power connections. Terminal 4 is the connection for equipment ground. Terminal 9 and 10 provide for connection to a required dry 52b contact and to a 52 TOC contact from the circuit breaker. When the

relay has input control power, Terminals 9 and 10 will have this potential on them.

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Terminals 4 and 5 are a N.O. contact from the Communications Close output relay that can be configured two different ways:

1. When Dip Switch S5 is in the “On” position, this output relay is programmed to close when the High Load timer times out.

2. When Dip Switch S5 is in the “Off” position the Communications Close Relay can be energized via a specific communications message sent over the INCOM port.

Terminals 6, 7 and 8 are Form “C” contacts on the trip alarm relay and change state whenever any protective trip is initiated by the relay. They do not change state when the master computer initiates an opening of the circuit breaker via the communication interface. After a protective trip, the contacts remain in the changed state until the “Reset” Pushbutton is pressed, whether the relay is in Manual Reset Mode or Auto Reset Mode.

Terminals 9,10 and 11 are Form “C” contacts on the protection off alarm relay. The contacts change state when nominal control power is applied to the relay and no internal errors are detected.

Instruction Leaflet DT3000

Page 18 Effective: Date 07/02 I.B. 17555D

Terminals 12 and 13 are a “NO” configurable contact. DIP Switch S3 is used to configure the trip contacts. With DIP Switch S3 in the “OFF” position, this contact closes when the relay detects a need for the circuit breaker to trip due to either a phase or ground instantaneous fault or the discriminator function. With DIP Switch S3 in the “ON” position, this contact closes when the relay detects a need for the circuit breaker to trip due to any type of ground fault.

Terminals 14 and 15 are also a “NO” configurable contact. With DIP Switch S3 in the “OFF” position, this contact closes when the relay detects a need for the circuit breaker to trip due to an inverse time overcurrent or short time function. The contact also operates when the communication interface initiates an action to open the circuit breaker. With DIP Switch S3 in the “ON” position, this contact closes when the relay detects a need for the

circuit breaker to trip due to any type of phase fault or communications.

Rear Surface Terminals: The rear surface terminals, identified as (A1, A2), (B1, B2), (C1, C2) and (G1, G2) provide the current transformer input connection points and are rated for 5 ampere inputs. (A1, A2), (B1, B2) and (C1, C2) are phase A, B, C current inputs respectively, while (G1, G2) is the ground current input.

2-2.3 EXTERNAL HARDWARE

The Digitrip 3000 Protective Relay requires that a customer supplied source of input control power be wired into the TB1 terminal block located on the rear panel. Refer to the typical wiring diagram in Figure 3-1. A power supply can be either ac or dc voltage within the acceptable voltage ranges outlined in “UL Testing and Specification Summary.”

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2-3 DT3000 AND DT3030 SPECIFICATIONS AND TEST SUMMARY

COMPLIANCE TESTING: Certifications:

• CUL/UL Recognized, File # E154862

• CAN/CSA C22.2 No. 14-M91 Industrial Control Equipment

• UL 1053 (6

• ANSI C37.90 (1989)

• EN 61010-1 (1993) - DT303X Models Only

• EN 55011 (1991)

• CE Compliant - DT303X Models Only

Emission Tests:

• EN 55011 (1991) - Group 1 Class A

• FCC 47 CFR Chapter 1 - Part 15 Subpart b Class A

Immunity Tests:

• ANSI C37.90.1 (1989) – Surge Withstand Capability 2.5KV OSWC, 4KV FTSWC

• ANSI C37.90.2 (1995) – RF Radiated Withstand Capability to 35V/M – all models

• EN61000-4-2 (1995) – ESD Immunity to 8KV

• IEC 255-22-2 (1989) - ESD Immunity to 8KV

• EN61000-4-3 (1995) – RF radiated Immunity to 10V/M

• IEC 255-22-3 (1989) - RF radiated Immunity to 10V/M

• EN61000-4-4 (1995) - Electrical Fast Transient Immunity to

10V/M

• IEC 255-22-4 (1989) - Electrical Fast Transient Immunity to 10V/M

• EN61000-4-5 (1995) – Surge Immunity 2/1KV C/DM

• EN61000-4-6 (1996) – RF conducted Immunity to 10Vo

• EN61000-4-11 (1994) – Voltage Dip. Short Int., Variations

Immunity

CURRENT INPUTS:

• Ct:

• Ct Burden:

• Saturation:

• Momentary:

• Ct Thermal Rating:

CT (PRIMARY) SETTING AVAILABLE:

Phase & Ground

Phase & Ground (Chicago version)

TIMING ACCURACY:

• Inverse Time Overcurrent Time:

• Short Delay Time:

Edition 1999)

5A Secondary

<0.1 VA @ Rated Current (5A)

5A (Secondary or Ct (Primary)

30 x In (Chicago version)

for 1 Second

100 x I

10A continuous

500A for 1 Second

10/25/50/75/100/150/200/250/300/400/500/

600/630/800/1000/1200/1250/1500/1600/

2000/2400/2500/3000/3200/4000/5000

5/10/25/50/75/100/150/200/300/400/500/600/

630/800/1000/1200/1250/1500/1600/2000/

2400/2500/3000/3200/4000/5000

±10% @ >1.5 x Pickup

±50ms

DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 19

OUTPUT TRIP CONTACTS: (Trip OC/Comm, Trip Inst, & Comm Close)

<0.004 ohm

28 x I

• Momentary:

• Continuous:

• Meets ANSI C37.90, paragraph 6.7

CONTROL POWER:

• Input Voltage: Nominal Oper. Range DT3000: 48 to 250Vdc 28 to 280Vdc 120 to 240Vac 66 to 264Vac (50/60Hz) (50/60Hz) DT3030: 24 to 48 Vdc 19 to 56Vdc

• Power Consumption: DT3000

Vdc

10VA

125 Vdc

10VA

DT3100

Vdc

10W

125 Vdc

17W

DT3030 10VA maximum

PHASE AND GROUND TIME-CURRENT CURVES:

• Thermal:

• ANSI:

(Per ANSI C37.112,1996)

• IEC: (Per IEC 255-3, 1989)

PHASE OVERCURRENT PICKUP RANGES:

• Inverse Time Overcurrent Setting:

(0.2 to 1.00) x I

• Short Delay Setting:

• Instantaneous Setting:

GROUND OVERCURRENT PICKUP RANGES:

• Inverse Time Overcurrent Setting:

• Short Delay Setting:

• Instantaneous Setting:

Make 30A ac/dc for 0.25 sec

Break 0.25A @ 250Vdc

Break 5A @ 120/240Vac

5A @ 120/240Vac

10VA

18W

I I

Flat

250 Vdc

120 Vac

10VA

120 Vac

18W

[Moderately Inverse] [Very Inverse] [Extremely Inverse] [Definite Time]

Moderately Inverse Very Inverse Extremely Inverse

IEC-A

IEC-B IEC-C IEC-D

[Moderately Inverse] [Very Inverse] [Extremely Inverse] [Definite Time]

(0.2 to 2.2) x I

[16 settings] (Chicago version)

(1 to 11) x I

(1 x 25) x I

, None [25 settings]

, None [30 settings]

(0.1 to 2.0) in I

(0.1 to 11) x I

(0.5 to 11) x I

, None [45 settings]

, None [33 settings]

5A @ 30Vdc

240 Vac

18VA

240 Vac

25VA

[29 settings]

[26 settings]

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Instruction Leaflet DT3000

Page 20 Effective: Date 07/02 I.B. 17555D

2-3 DT3000 AND DT3030 SPECIFICATIONS AND TEST SUMMARY (CONTINUED)

TIME DELAY SETTINGS:

• Inverse Time Overcurrent Time Multiplier:

• Short Delay Time:

AUXILIARY RELAYS: (Protection Off Alarm and Trip Alarm)

• Make/Break:

• Continuous:

COMMUNICATIONS:

• PowerNet Compatible / Built-in INCOM

• Data Rate is 1200 or 9600 Baud

• Set INCOM address from front panel

CURRENT MONITORING:

• True rms Sensing:

• Display Accuracy:

• Amperes Demand:

• High Load:

Notes: 1. For Ground Pickup < 0.2pu; Time Tolerance ± 15%.

It, I

t, I4t Curve: 0.2 to 40 [47 settings] (Chicago version)

It, I

Flat: 0.2 to 2.0 [21 settings]

ANSI (all): 0.1 to 5.0 [50 settings]

IEC (all): 0.025 to 1.00 [40 settings]

IEC (all): 0.05 to 1.00 [20 settings] (Chicago version)

0.05 to 1.5 sec. [22 settings]

5A @ 120/240Vac & 30Vdc

+1% of Full Scale [I

Average Demand over 5 Minute Sampling Window

t, I4t Curve: 0.2 to 40 [48 settings]

5A @ 120/240 Vac (Chicago version)

5A @ 120/240Vac

5A Continuous (Chicago version)

] from 0.04 x In to 1 x I

+2% of Full Scale [In] from 1 x In to 2 x I

85% of Inverse Time Overcurrent Setting

5A @ 30Vdc

3-Phase and Ground

ENVIRONMENT:

• Environment:

• Mounting Location:

• Operating temperature:

• Operating Humidity:

• Storage Temperature:

ADDITIONAL TESTS:

• Dielectric Strength:

• Seismic Test:

ZONE SELECTIVE INTERLOCKS:

• Phase:

• Ground:

Indoor Use Only, Pollution Degree II, Altitude 2,500m, Installation Category II

Device should be positioned near the main disconnect

-30 to +55 Degrees Celsius

0 to 95% Relative Humidity [Non-Condensing]

-40 to +70 Degrees Celsius

Current Inputs: 3,000Vac for 1 minute Phase to Phase

Meets requirements for UBC and California Building Code Zone 4 ZPA = 3.5

Inverse Time Overcurrent and Short Delay

SECTION 3: OPERATION

3-1 INTRODUCTION

This section specifically describes the operation and functional use of the Digitrip 3000 Protective Relay. It does not address in detail rear power connections and DIP switch settings. These topics are covered in SECTION 5 entitled “INSTALLATION, STARTUP AND TESTING.” It would be helpful; however, to become familiar with the relay’s wiring diagram before proceeding with the rest of this section (Figure 3-1).

3-2 POWER-UP AND SELF TESTING

When the proper ac or dc control voltage is applied to power supply input terminals, the unit will initiate a “Power On Reset” to its chip circuitry. This causes the unit’s firmware to perform some self-testing and initialization of its ROM, RAM and E2 (non-volatile) memory. If any problem exists, a diagnostic message will be displayed in the Settings/Test Time/Trip Cause Window. A complete list of messages and their meanings are listed in Table 3.2. Additionally, if a problem does exist, the “Operational LED” will light red and the “Protection Off Alarm” relay will not energize. When all self checks are good, the “Protection

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Off Alarm” relay will energize, and the “Operational LED” will blink green.

3-3 PANEL OPERATIONS

Begin by reviewing the material presented in SECTION 2 entitled “FUNCTIONAL DESCRIPTION.” Since basic definitions and explanations were given in SECTION 2, no further explanation as to function will be offered in this section. It is assumed that the operator is now familiar with Digitrip 3000 terms, available settings and overall capabilities.

3-3.1 CHARACTERISTIC CURVE

Digitrip 3000 Protective Relays provide circuit breakers with an extensive degree of selective coordination potential and permit curve shaping over a wide range. Available pickup settings, inverse time overcurrent time multiplier settings and inverse time overcurrent (phase and ground) curve selections are addressed here with respect to their effect on the resultant characteristic curve.

In general, there are three different families of curves to choose from as shown in Table 3.1. The operating characteristics of the relay are graphically represented by time-current characteristic curves shown in Figure 3-2.

DT3000 Instruction Leaflet I.B. 17555D Effective: Date 07/02 Page 21

TABLE 3.1 DIGITRIP 3000 CURVE SHAPES

Thermal

Curves

ANSI Curves

(per ANSI C37.112)

IEC Curves

(per IEC 255-3)

It Moderately Inverse IEC-A I2t Very Inverse IEC-B I4t Extremely Inverse IEC-C

FLAT IEC-D

As shown in Figure 3-1, the ANSI and IEC “Curve Shapes” are in terms of multiples of (Pickup Current of the Ct Primary), whereas ‘short delay” and “instantaneous” are in terms of multiples of I

(5A

secondary of Ct primary current). The thermal curve is represented in terms of multiples of I

for its curve

shape, short delay, and instantaneous settings. This must be considered in the coordination study and in the programming of the Digitrip 3000 Protective Relay.

ANSI C37.l 12 defines the ANSI curves and IEC curves are defined by lEC 255-3. These curve shapes combine with the customized capability of the short delay and instantaneous functions to allow for very versatile coordinated protection schemes. The user can also customize the thermal curve shape to any desired type of coordinated protection scheme.

These curves show how and when a particular relay will act for given values of time and current. Because the DT3000 is very versatile the easier it is to accomplish close coordination and achieve optimum protection. The makeup of a typical curve is presented for clarification purposes.

For the sake of simplification, the curve discussion will center on a single line curve. Keep in mind, however, that a characteristic curve in reality is represented by a band of minimum and maximum values, not a line (Figure 3-1). Minimum and maximum values are generally the result of tolerances introduced by the manufacturing process for components and the relay’s accuracy. Any expected value of tripping current or time could be the nominal value anticipated within the plus or minus tolerance. The tolerances just mentioned are usually stated in terms of the relay’s accuracy and frequently highlighted on the actual working curves. Accuracy is stated in terms of a plus or minus percentage and represents a permitted fluctuation on either side of the nominal tripping point for a family of relays, like the Digitrip 3000.

The ability to adjust the relay and the continuous current of the Digitrip 3000 Protective Relay are two factors that contribute significantly to the great flexibility.

a) Adjustable: The ability to adjust the relay permits

movement of its characteristic curve or parts of the curve. This movement can be done in both a horizontal and vertical direction on the time current grid. The actual shape of the curve can be changed along with the curve movement. This ability permits distinct curves to be established that will better match the electrical protection to the application need

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(Figures 3-3 through 3-9) Notice that there is no horizontal movement of the ANSI and IEC curve shapes. Only the point at which the relay starts to time out moves along the curve shape.

b) Nominal Continuous Current: The Digitrip 3000’s

nominal continuous primary current (I

) is established

by the ratio of the selected current transformers. The current transformer ratio must be set via the initial programming of the relay. These settings must agree with the circuit current transformers to which the relay is connected. Therefore, I

is established by the

current transformer ratio used and becomes the primary scale factor for the trip functions and readouts.

Before proceeding with the curve explanation, it should be noted that combining functional capabilities, such as inverse time overcurrent, short delay and instantaneous, is a coordination activity. The effects of one set of settings on another setting should always be evaluated to determine if the results under all possible circumstances are acceptable. This helps to avoid unexpected operations or non-operations in the future. Such possibilities are highlighted at the end of this discussion as a reminder when establishing relay characteristic parameters.

Inverse Time Overcurrent Protection

Inverse time overcurrent protection consists of a curve shape pickup setting and an inverse time multiplier setting. The inverse time overcurrent function offers eleven possible curve shape types as previously described (Figure 3-2 and Table 3.1). When programming the relay, this will be the first choice to make. The curve shape and its effect on the characteristic curve will be covered with the time multiplier explanations.

The pickup setting establishes the current level pickup at which the relay’s inverse time overcurrent tripping function begins timing. If, after a predetermined amount of time, the current condition that started the timing process still exists, the relay’s trip relay is energized. Pickup settings can be adjusted from 0.20 to 2.20 times I

for the standard

DT3000. The Pickup settings for the Chicago version

(DT3100 and DT3101) can be adjusted from 0.20 to 1.00 times I

Refer to Tables 2.2 and 2.3 for a complete list of

available settings. Figure 3-4 graphically illustrates how the Inverse Time Overcurrent Pickup portion of the overall curve can be moved horizontally on the time current grid by means of the pick-up settings. The Inverse Time Overcurrent Pickup is represented by the dotted lines, while a solid line represents the rest of the curve.

The Time Multiplier setting is used to select a predetermined amount of time a sustained overload condition will be carried before the breaker trips. For the Thermal Curves, a value of (3 x I

) is the reference point

where the programmed time multiplier setting is fixed on the curve. Wide ranges of time settings are available and depend upon the curve shape selection. As Time Multiplier settings are varied, the Time Multiplier portion of the overall curve is moved vertically up or down on the time current grid. This movement is also independent of the

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Eaton Digitrip 3000 series Installation, Operation And Maintenance Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual