Eaton Cutler-Hammer Digitrip 3000 Instructions For Installation, Operation And Maintenance
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Eaton Cutler-Hammer Digitrip 3000 Instructions For Installation, Operation And Maintenance

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I.B. 17555C
Instructions for Installation, Operation and Maintenance
of the Cutler-Hammer Digitrip 3000 and Digitrip 3030
Protective Relay
Effective November 1999 Supersedes I.B. 17555A dated March 1999

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Summary of Contents for Eaton Cutler-Hammer Digitrip 3000

  • Page 1 I.B. 17555C Instructions for Installation, Operation and Maintenance of the Cutler-Hammer Digitrip 3000 and Digitrip 3030 Protective Relay Effective November 1999 Supersedes I.B. 17555A dated March 1999...

  • Page 2: Table Of Contents

    I.B. 17555C Page ii TABLE OF CONTENTS PAGE SECTION 1: INTRODUCTION ..............1 Preliminary Comments And Safety Precautions .
  • Page 3 I.B. 17555C Page iii Replacing Digitrip Mv With Digitrip 3000 ............35 Wiring .
  • Page 4 I.B. 17555C Page iv FIGURES Figure Title Page Digitrip 3000 Protective Relay (Front View) ..........2 Digitrip 3030 Protective Relay (Rear and Side Views) .
  • Page 5 I.B. 17555C Page v FIGURES Figure Title Page Rear View of DT3001 Drawout Outer Case ..........A3 DT3001 Typical AC or DC Schematic .
  • Page 6 I.B. 17555C Page vi TABLES Table Title Page DT3000 Protective Relay Family Styles ..........1 DT3000 Drawout Case Replacement Parts .

  • Page 7: Section 1: Introduction

    This Technical document covers most aspects associated APPLICABLE. with the installation, application, operation, and mainte- nance of the Cutler-Hammer Digitrip 3000 Family of Pro- This document is provided as a guide for authorized and tective Relays. Table 1.1 shows all of the DT3000 Family qualified personnel only in the selection and application products that are covered by this Instruction Book.

  • Page 8: 1-1.1 Warranty And Liability Information

    I.B. 17555C Page 2 1-1.1 WARRANTY AND LIABILITY INFORMATION GENERAL INFORMATION NO WARRANTIES, EXPRESSED OR IMPLIED, The Digitrip 3000 Protective Relays panel mounted multi- INCLUDING WARRANTIES OF FITNESS FOR A PAR- function, microprocessor based overcurrent relays, TICULAR PURPOSE OF MERCHANTABILITY, OR designed for both ANSI and IEC applications (Figures 1-1 WARRANTIES ARISING FROM COURSE OF DEALING and 1-2).

  • Page 9: Functions/Features/Options

    I.B. 17555C Page 3 Thermal curves, plus ANSI and IEC inverse time overcur- pendently programmed over a range of 5:5 to 5000:5. rent curves provide close coordination with both down- Refer to Table 2.4 for all available CT ratio settings. stream and upstream protective devices.
  • Page 10 I.B. 17555C Page 4 The Digitrip 3000 Protective Relay provides five protec- Digitrip 3000 Protective Relays provide greater selective tive functions for both phase and ground protection. The coordination potential by providing 11 different curve ground element is capable of a residual, an external shapes (Figure 1-4).

  • Page 11: Standards

    I.B. 17555C Page 5 Curves shapes defined by ANSI C37.112. IEC Curve shapes defined by IEC 255-3. Fig. 1-4 Digitrip 3000 Curve Shape Possibilities In addition to being able to provide a circuit breaker STANDARDS “OPEN” or “CLOSED” status to the remote location, the Digitrip 3000 displays and remotely transmits parame- Digitrip 3000 Protective Relays are “Component Recog- ®...

  • Page 12: Section 2: Functional Description

    I.B. 17555C Page 6 SECTION 2: FUNCTIONAL DESCRIPTION TABLE 2.1 CURVE SELECTION Curve Type Selection Result PROTECTION, TESTING AND COMMUNICATION CAPABILITIES Thermal Moderately Inverse Inverse 2-1.1 RMS SENSING Extremely Inverse Digitrip 3000 Protective Relays provide true RMS sensing Definite or Fixed Time FLAT for proper correlation with the thermal characteristics of conductors and equipment.
  • Page 13 I.B. 17555C Page 7 TABLE 2.2 CHARACTERISTIC FOR PHASE ELEMENT TYPE SETTING AVAILABLE SETTINGS TOLERANCE CURVE # CURVE SHAPE IT, I T, I T, FLAT, MOD, VERY, XTRM, IECA, IECB, IECC, IECD INVERSE TIME OVERCURRENT 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50 ±5% PICKUP 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85,...
  • Page 14 I.B. 17555C Page 8 TABLE 2.3 CHARACTERISTIC FOR GROUND ELEMENT TYPE SETTING AVAILABLE SETTING TOLERANCE CURVE # IT, I T, I T, FLAT, MOD, VERY, XTRM, CURVE SHAPE IECA, IECB, IECC, IECD 0.100, 0.125, 0.150, 0.175, 0.200, 0.225, + 5% 0.250, 0.275, 0.300, 0.350, 0.400, 0.450, INVERSE TIME OVERCURRENT 0.500, 0.550, 0.600, 0.650, 0.700, 0.750,...
  • Page 15 I.B. 17555C Page 9 TABLE 2.4 MISCELLANEOUS SETTINGS TYPE SETTING AVAILABLE SETTINGS HIGHLOAD TIME 0 Sec, 5 Sec, 10 Sec, 30 Sec, 1 min, 2 min, 5 min (pickup fixed @ 0.85 X Phase Time Overcurrent Setting) FREQUENCY 50 Hz, 60 Hz PHASE CT RATIO 5,10, 25, 50, 75,100,150, 200, 250, 300, 400, 500, 600, 630, 800,1000,1200,1250,1500,1600, 2000, 2400, 2500, 3000,...

  • Page 16: 2-1.5 Integral Testing

    I.B. 17555C Page 10 High Load: The available high load time-out settings are TABLE 2.5 FACTORY SET DEFAULTS shown in Table 2.4. At a current 85% or above the inverse time overcurrent phase setting value, the high load func- DIP SWITCH SETTINGS tion will begin timing to the time setting selected and the Type Default Setting...

  • Page 17: 2-1.6 Communications

    I.B. 17555C Page 11 2-1.6 COMMUNICATIONS Reset Pushbutton (Blue) The Reset pushbutton is used to reset any of the follow- An important function of the Digitrip 3000 Protective ing: the trip relays (overcurrent and instantaneous), the Relay is communications and control via the Cutler- trip alarm relay, the trip LEDs, and the ampere demand Hammer PowerNet Protocol.
  • Page 18 I.B. 17555C Page 12 Fig. 2-1 Typical Communications Wiring Diagram Effective November 1999...
  • Page 19 I.B. 17555C Page 13 Test Pushbutton (Yellow) operation. Several of the LEDs are bi-colored and can be The selected test operation is initiated by pressing and lit green or red. releasing the Test pushbutton. Operational LED Select Settings Pushbutton (Blue) The Operational LED at the top of the relay should be In the program mode of operation, the Select Settings green and blink on for approximately one second and...

  • Page 20: 2-2.2 Rear Access Panel

    I.B. 17555C Page 14 Short Delay Setting LED is located in the upper portion of the relay’s faceplate and This LED is bi-colored and operates like the time over- is labeled RMS Amperes. A second window is located in current setting LED. the lower portion of the faceplate adjacent to the program and test LEDs.
  • Page 21 I.B. 17555C Page 15 • Switch S1 is used to select whether the IMPACC buff- COMMAND can be sent to the Digitrip 3000 by a master ers are set for the Digitrip 3000 configuration or the computer to remotely reset the Digitrip 3000. Digitrip MV configuration.

  • Page 22: 2-2.3 External Hardware

    I.B. 17555C Page 16 Note: Digitrip 3000 Protective Relays are shipped Terminals 9,10 and 11 are Form “C” contacts on the pro- with a phase zone interlocking jumper (across tection off alarm relay. The contacts change state when terminals TB 1-13 and 14) and a ground zone nominal control power is applied to the relay and no inter- interlocking jumper (across terminals TB 1-11 and nal errors are detected.

  • Page 23: Dt3000 And Dt3030 Specifications And Test Summary

    I.B. 17555C Page 17 DT3000 AND DT3030 SPECIFICATIONS AND TEST SUMMARY COMPLIANCE TESTING: CONTROL POWER: Certifications: • Input Voltage: Nominal Oper. Range DT3000 48 to 250Vdc 28 to 280Vdc • UL Recognized, File # E154862 120 to 240Vac 90 to 254Vac •...
  • Page 24 I.B. 17555C Page 18 DT3000 AND DT3030 SPECIFICATIONS AND TEST SUMMARY (CONTINUED) ENVIRONMENT: AUXILIARY RELAYS: • Environment: Indoor Use Only, Pollution (Protection Off Alarm and Trip Alarm) Degree II, Altitude 2,500m, • Make/Break: 5A @ 120/240Vac & 30Vdc Installation Category II •...

  • Page 25: Section 3: Operation

    I.B. 17555C Page 19 SECTION 3: OPERATION TABLE 3.1 DIGITRIP 3000 CURVE SHAPES Thermal ANSI Curves IEC Curves INTRODUCTION Curves (per ANSI C37.112) (per IEC 255-3) This section specifically describes the operation and Moderately Inverse IEC-A functional use of the Digitrip 3000 Protective Relay. It Very Inverse IEC-B does not address in detail rear power connections and...
  • Page 26 I.B. 17555C Page 20 The adjustability and continuous current of the Digitrip tings. Figure 3-3 graphically illustrates how the Inverse 3000 Protective Relay are two factors that contribute sig- Time Overcurrent Pickup portion of the overall curve can nificantly to the great flexibility of the relay. be moved horizontally on the time current grid by means of the pick-up settings.
  • Page 27 I.B. 17555C Page 21 Fig. 3-1 Digitrip 3000 Typical Wiring Diagram Effective November 1999...
  • Page 28 I.B. 17555C Page 22 Fig. 3-2 Digitrip 3000 Time-Current Characteristic Curves Note that the scope of protection offered by Digitrip 3000 curve selections is the general shape of the triangle. is a coordinated effort. This is especially true when a When the Short Delay Time setting is low enough, this number of protective functions, such as inverse time situation will not exist.
  • Page 29 I.B. 17555C Page 23 Fig. 3-3 Sample Electronic Trip Curves Ground Fault Protection Characteristic Curve Reminders The ground fault protection function can be a composite As previously mentioned, combining protective capabili- of the ground: 1) inverse time overcurrent curve shape, ties is a matter of coordination.
  • Page 30 I.B. 17555C Page 24 Fig. 3-4 Typical Inverse Time Overcurrent Pickup Fig. 3-6 Short Delay Setting Adjustment Horizontal Movement Fig. 3-7 Short Delay Time Adjustment Fig. 3-5 Typical Time Multiplier Adjustment (I Response) Effective November 1999...

  • Page 31: 3-3.2 Program Mode

    I.B. 17555C Page 25 3-3.2 PROGRAM MODE CAUTION DIGITRIP 3000 PROTECTIVE RELAY SETTINGS MUST BE PROGRAMMED BEFORE THE RELAY IS PUT INTO OPERATION. CARE MUST BE TAKEN WHEN PROGRAMMING THE DIGITRIP 3000 WHILE THE BREAKER IS CLOSED AND CURRENT IS FLOW- ING.
  • Page 32 I.B. 17555C Page 26 tons can now be used to change the value of the set- Select Settings pushbutton is pressed and released, the point. Keep in mind that the Raise and Lower pushbut- unit steps to the next setpoint. tons will roll over from highest to lowest and lowest to highest respectively.

  • Page 33: 3-3.3 Programming Overview

    I.B. 17555C Page 27 To save the new settings at any time, press and release 3-3.4 TEST MODE the Save Settings pushbutton. When the Save Settings pushbutton is pressed and released, the unit will blank The Test Mode is not intended for live primary current the alphanumeric display for two seconds, and then dis- interruption.

  • Page 34: Communications Function

    I.B. 17555C Page 28 The alphanumeric display shows the time to trip, and the numeric display shows the magnitude of the trip current. The Test Mode can be exited as follows: 1. Press and release the Test Mode On/Off pushbutton. 2.
  • Page 35 I.B. 17555C Page 29 TABLE 3.2 DIGITRIP 3000 DISPLAY MESSAGES Message Meaning “TEST” Entered test mode. “RAM” A ram check error was detected. “ERR” An error in the test mode has occurred/or an error in the EPROM setpoints was detected. “PRGM”...
  • Page 36 I.B. 17555C Page 30 Fig. 3-11 Local Programming Sequence Flow Chart Effective November 1999...
  • Page 37 I.B. 17555C Page 31 Effective November 1999...

  • Page 38: Section 4: Application Considerations

    I.B. 17555C Page 32 SECTION 4: APPLICATION When a Digitrip 3000 initiates a trip signal, the zone inter- locking signal stays active for an additional 175 millisec- CONSIDERATIONS onds. Therefore, if a downstream Digitrip 3000 is zone interlocked to an upstream Digitrip 3000, the downstream ZONE INTERLOCKING CAPABILITIES breaker will have 175 milliseconds to clear the fault before the upstream Digitrip 3000 is allowed to react to...
  • Page 39 I.B. 17555C Page 33 Fig. 4-1 Connection Diagram for Typical Phase Zone Selective Interlocking Effective November 1999...
  • Page 40 I.B. 17555C Page 34 Fig. 4-2 Connection Diagram for Typical Ground Zone Selective Interlocking Effective November 1999...

  • Page 41: Section 5: Installation, Startup And Testing

    I.B. 17555C Page 35 SECTION 5: INSTALLATION, STARTUP AND ward. Use the 0.38 in. (0.9 cm) long screws included with the relay to mount the unit on a single-thickness panel. TESTING INTRODUCTION This section describes mounting, wiring, startup and mis- cellaneous testing details associated with the Digitrip 3000 Protective Relay.

  • Page 42: Wiring

    I.B. 17555C Page 36 Fig. 5-2 Digitrip 3000 Protective Dimensions (Inches) WIRING Note: Refer to the Specifications and Test Summary for proper power supply input requirements. The wiring of the Digitrip 3000 Protective Relay must fol- low a suitable “Wiring plan drawing.” The term wiring All wiring must conform to applicable federal, state and plan, as used here, refers to the drawings made for the local codes.

  • Page 43: Miscellaneous Testing

    I.B. 17555C Page 37 MISCELLANEOUS TESTING 3. All other terminals have a 1500 volt ac breakdown voltage for 1 minute to earth ground except for the above CAUTION restraint. CAUTION TABLE 5.1 DIGITRIP 3000 DIP SWITCH SETTINGS DO NOT PERFORM DIELECTRIC TESTING BETWEEN Switch Positions THE DIGITRIP’S METAL BACKPLATE OR THE EARTH Switch...

  • Page 44: Section 6: Maintenance And Storage

    I.B. 17555C Page 38 SECTION 6: MAINTENANCE AND STORAGE Step 1: Turn off control power at the main disconnect or isolation switch of the control power sup- ply. If the switch is not located in view from GENERAL the relay, lock it out to guard against other personnel accidentally turning it on.
  • Page 45 I.B. 17555C Page 39 TABLE 6.1 TROUBLESHOOTING GUIDE Symptom Probable Cause Possible Solution(s) Reference Operational LED is Off Protective Relay’s Control Verify that Control Power is Connected Figure 3-1 and Power is Deficient or Absent Between TB1 -5 and TB1 -6 and that it Paragraph 2-3 is within Specifications Protective Relay is...
  • Page 46 I.B. 17555C Page 40 TABLE 6.1 TROUBLESHOOTING GUIDE (CONTINUED) Symptom Probable Cause Possible Solution(s) Reference Circuit Breaker Trips The Short Delay Time Check Coordination Curves for Short Section 7, Much Slower than Setting Determines the Delay and Inverse Time Overcurrent Paragraph 3-3.1 Expected on Inverse Minimum Inverse Time...

  • Page 47: Section 7: Time-Current Curves

    I.B. 17555C Page 41 SECTION 7: TIME-CURRENT CURVES DIGITRIP 3000 INVERSE TIME OVERCURRENT CURVES The specific time-current curves applicable to the Digitrip 3000 Protective Relay are included in this section. Effective November 1999...
  • Page 48 I.B. 17555C Page 42 Fig. 7-1 Inverse Time Overcurrent Phase, I T Curves (SC-5390-92B) Effective November 1999...
  • Page 49 I.B. 17555C Page 43 Fig. 7-2 Inverse Time Overcurrent Phase, I T Curves (SC-5391-92B) Effective November 1999...
  • Page 50 I.B. 17555C Page 44 Fig. 7-3 Inverse Time Overcurrent Phase, IT Curves (SC-5392-92B) Effective November 1999...
  • Page 51 I.B. 17555C Page 45 Fig. 7-4 Inverse Time Overcurrent Phase, Flat Curves (SC-5393-92B) Effective November 1999...
  • Page 52 I.B. 17555C Page 46 Fig. 7-5 Short Delay Phase Curves (SC-5394-92B) Effective November 1999...
  • Page 53 I.B. 17555C Page 47 Fig. 7-6 Inverse Time Overcurrent/Short Delay Curves (SC-5395-92B) Effective November 1999...
  • Page 54 I.B. 17555C Page 48 Fig. 7-7 Instantaneous Curves (SC-5396-92B) Effective November 1999...
  • Page 55 I.B. 17555C Page 49 Fig. 7-8 Inverse Time Overcurrent Ground, I T Curves (SC-5399-92B) Effective November 1999...
  • Page 56 I.B. 17555C Page 50 Fig. 7-9 Inverse Time Overcurrent Ground, I T Curves (SC-5400-92B) Effective November 1999...
  • Page 57 I.B. 17555C Page 51 Fig. 7-10 Inverse Time Overcurrent Ground, IT Curves (SC-5401-92B) Effective November 1999...
  • Page 58 I.B. 17555C Page 52 Fig. 7-11 Inverse Time Overcurrent Ground, Flat Curves (SC-5402-92B) Effective November 1999...
  • Page 59 I.B. 17555C Page 53 Fig. 7-12 Short Delay Ground Curves (SC-5403-92B) Effective November 1999...
  • Page 60 I.B. 17555C Page 54 Fig. 7-13 ANSI Moderately Inverse Curves (SC-6685-96) Effective November 1999...
  • Page 61 I.B. 17555C Page 55 Fig. 7-14 ANSI Very Inverse Curves (SC-6686-96) Effective November 1999...
  • Page 62 I.B. 17555C Page 56 Fig. 7-15 ANSI Extremely Inverse Curves (SC-6687-96) Effective November 1999...
  • Page 63 I.B. 17555C Page 57 Fig. 7-16 IEC-A Moderately Inverse Curves (SC-6688-96) Effective November 1999...
  • Page 64 I.B. 17555C Page 58 Fig. 7-17 IEC-B Very Inverse Curves (SC-6689-96) Effective November 1999...
  • Page 65 I.B. 17555C Page 59 Fig. 7-18 IEC-C Extremely Inverse Curves (SC-6690-96) Effective November 1999...
  • Page 66 I.B. 17555C Page 60 Fig. 7-19 IEC-D Flat Curves (SC-6691-96) Effective November 1999...

  • Page 67: Digitrip 3000 Curve Equations

    I.B. 17555C Page 61 DIGITRIP 3000 CURVE EQUATIONS Thermal Curve Equation T = Trip Time SLOPE D = Time Multiplier (0.2 to 40) I = Input Current M = Slope (0 = FLAT, 1 = IT, 2 = I T, 4 = 1 K = 3 for phase, 1 for ground FLAT ANSI/IEC Curve Equation...
  • Page 68 I.B. 17555C Page 62 Effective November 1999...

  • Page 69: Introduction

    I.B. 17555C Page A1 Appendix A Table of Contents Page and locking mechanism, and the aluminum housing with terminal blocks. Introduction ......A1 General Description .

  • Page 70: Digitrip 3001 Drawout Relay Parts List

    I.B. 17555C Page A2 DIGITRIP 3001 DRAWOUT RELAY PARTS LIST MOUNTING THE DRAWOUT OUTER CASE 3.3.1 The DT3001 Drawout Relay mounts in the exact BEFORE MOUNTING THE DRAWOUT RELAY, same mounting holes as a standard DT3000. REVIEW TABLE 3 FOR ALL OF THE INCLUDED PARTS: 3.3.2 Remove the Drawout Inner Chassis from the...

  • Page 71: Wiring And Setup

    I.B. 17555C Page A3 WIRING AND SETUP The appropriate sized spade and ring lugs can also be used to accommodate the wires. 4.2 All contacts are shown in the de-energized position. WARNING NOTE: The Protection Off Alarm Relay is energized ENSURE THAT THE INCOMING AC POWER when control power is applied and the DT3001 is SOURCES ARE DISCONNECTED BEFORE PER-...
  • Page 72 I.B. 17555C Page A4 Fig. A-4 DT3001 Typical AC or DC Schematic Fig. A-5 DT3001 Typical AC External Current Fig. A-6 DT3001 Typical Residual Ground Connection Connection with Zero Sequence Ground CT Effective November 1999...
  • Page 73 I.B. 17555C Page A5 Fig. A-7 DT3001 Typical Wiring Diagram Effective November 1999...

  • Page 74: Application Considerations

    I.B. 17555C Page A6 APPLICATION CONSIDERATIONS DT3000 Typical Main Digitrip 3000 NOTE: The following material replaces Figure 4-1 and Ground 4-2 on pages 32 and 33. Zone selective interlocking is available on the Digitrip Zone Com. 3001 Protective Relays for the inverse time and short time functions on the phase and ground elements.

  • Page 75: Drawout Operation

    I.B. 17555C Page A7 DRAWOUT OPERATION When the unit is seated properly, the quick release but- tons at the top and bottom of the unit will return to their non-compressed position. The device can now be INSERTING THE RELAY secured in the outer case by inserting a utility locking ring in the provided slot.
  • Page 76 I.B. 17555C Page A8 Effective November 1999...

  • Page 77: Introduction

    I.B. 17555C Page B1 Appendix B Table of Contents Page • Powers the relay from nominal 120 Vac, 50/60Hz (DT3010 model) or 240 Vac, 50/60Hz (DT3020 model) Introduction ......B1 auxiliary power, which is normally connected and avail- General Description .
  • Page 78 I.B. 17555C Page B2 Fig. B-1 Digitrip 3000 with DSPS NOTE: The following material replaces section 2-3, pages 16 & 17. TABLE B-2 DT3010 AND DT3020 SPECIFICATION AND TEST SUMMARY COMPLIANCE TESTING: PHASE AND GROUND TIME-CURRENT CURVES: Certifications: • Thermal [Moderately Inverse] [Very Inverse] •...
  • Page 79 I.B. 17555C Page B3 TABLE B-2 DT3010 AND DT3020 SPECIFICATION AND TEST SUMMARY (CONTINUED) CURRENT INPUTS: PHASE OVERCURRENT PICKUP RANGES: • Cts: 5A Secondary • Inverse Time Overcurrent Setting: (0.2 to 2.2) x I [29 settings] • Ct Burden: See Burden Curves Figures 8 & 9 <0.04 ohm @ Rated Current(5A) •...

  • Page 80: Functional Description

    I.B. 17555C Page B4 FUNCTIONAL DESCRIPTION PANEL PREPARATION The Dual-Source Power Supply contains 1 ac voltage The dimensions for the cutout, along with the location of transformer and 3 ac current transformers. The ac volt- the 10 mounting holes, are shown in Figure 5-1 . Before age transformer is used to supply nominal ac control actually cutting the panel, be sure that the required 3- power to the unit.
  • Page 81 I.B. 17555C Page B5 Fig. B-2 Digitrip 3010/3020 Dimensions (Inches) Effective November 1999...

  • Page 82: Wiring And Setup

    I.B. 17555C Page B6 WIRING AND SETUP SENSITIVITY AND CT RATIOS For scenarios where the relay must trip with loss of ac WARNING power, the main-ct secondary current must be greater than 9 amperes for a single-phase-to-ground fault or 6 amperes for a three-phase fault.
  • Page 83 I.B. 17555C Page B7 Fig. B-3 Digitrip 3010/3020 Typical Wiring Diagram Effective November 1999...
  • Page 84 I.B. 17555C Page B8 Fig. B-4 Digitrip 3010/3020 Protective Relay Typical AC Schematic Fig. B-5 Digitrip 3010/3020 Typical AC External Current Fig. B-6 Digitrip 3010/3020 Typical Residual Ground Connection with Zero Sequence Ground CT Connection Effective November 1999...

  • Page 85: Ct Saturation

    I.B. 17555C Page B9 CT SATURATION tudes. The burden is much lower than that of an electro- mechanical relay. The DSPS has been designed and extensively tested to assure continued relay powering when the main cts satu- BURDEN DATA rate. It powers the relay even for extreme cases in which the ct delivers only a succession of current spikes of 1 to In normal operating conditions, the burden is <0.08 ohms 2 ms each half-cycle.
  • Page 86 I.B. 17555C Page B10 DT3000 With Dual-Source Power Supply Burden Curves 0.18 0.16 0.14 0.12 Total Burden, With Vac, 3 Phase I Total Burden, No Vac, 3 Phase I 0.08 Total Burden, With Vac, 1 Phase I Total Burden, No 0.06 Vac, 1 Phase I 0.04...

  • Page 87: Testing The Dual-Source Power Supply

    I.B. 17555C Page B11 TESTING THE DUAL-SOURCE POWER SUPPLY 7.1.7 The ac voltage drop across the ct input should rise to a larger value, at least twice as large as when ac The DSPS requires no maintenance or adjustment. Use was applied, and maybe approaching 0.5 volt as the following procedures to check for proper operation.
  • Page 88 I.B. 17555C Page B12 DT3000 With Dual-Source Power Supply CT Voltage Drop Curves 1.25 1.00 CT Voltage Drop, With 0.75 Vac, 3 Phase I CT Voltage Drop, No Vac, 3 Phase I CT Voltage Drop, With 0.50 Vac, 1 Phase I CT Voltage Drop, No Vac, 1 Phase I 0.25...
  • Page 89 I.B. 17555C Page B13 Effective November 1999...
  • Page 90 I.B. 17555C Page B14 Effective November 1999...
  • Page 91 I.B. 17555C Page B15 Effective November 1999...
  • Page 92 I.B. 17555C Page B16 This instruction booklet is published solely for information purposes and should not be considered all inclusive. If further information is required, you should consult Cutler- Hammer. Sale of product shown in this literature is subject to terms and conditions outlined in appropriate Cutler-Hammer selling policies or other contractual agreement between the parties.

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