Eaton Cutler-Hammer Digitrip 3000 Programming manual

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

I.B. 17555C
Effective November 1999
Page ii
TABLE OF CONTENTS
PAGE
SECTION 1: INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1 Preliminary Comments And Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1.1 Warranty And Liability Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-1.2 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-2 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-3 Functions/Features/Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1-4 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2-1.4 Protection Curve Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2-1.5 Integral Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2-1.6 Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2-2 Protective Relay Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2-2.1 Front Operations Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2-2.2 Rear Access Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2-2.3 External Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2-3 DT3000 and DT3030 Specifications and Test Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SECTION 3: OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3-1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3-2 Power-up And Self Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3-3 Panel Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3-3.1 Characteristic Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3-3.2 Program Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3-3.3 Programming Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3-3.4 Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3-4 Communications Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3-4.1 Address and Baud Rate Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
SECTION 4: APPLICATION CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4-1 Zone Interlocking Capabilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
SECTION 5: INSTALLATION, STARTUP AND TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5-1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5-2 Panel Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5-2.1 Cutout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5-2.2 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

I.B. 17555C
Effective November 1999
Page iii
5-3 Replacing Digitrip Mv With Digitrip 3000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
5-4 Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
5-5 Initial Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
5-5.1 Before Power Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
5-5.2 Initial Power Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
5-6 Miscellaneous Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
SECTION 6: MAINTENANCE AND STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
6-1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
6-1.1 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
6-2 Troubleshooting Guide (Table 6.1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
6-3 Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
SECTION 7: TIME-CURRENT CURVES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
7-1 Digitrip 3000 Inverse Time Overcurrent Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
7-2 Digitrip 3000 Curve Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
APPENDIX A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
1.0 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
2.0 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
3.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
3.1 Panel Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
3.2 Digitrip 3001 Drawout Relay Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2
3.3 Mounting the Drawout Outer Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2
4.0 Wiring and Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A3
5.0 Application Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A6
6.0 Drawout Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A7
6.1 Inserting the Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A7
6.2 Removing the Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A7
APPENDIX B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1
1.0 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1
2.0 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1
3.0 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B4
4.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B4
4.1 Panel Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B4
4.2 Mounting the Digitrip 3000 with Dual-Source Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B4
5.0 Wiring and Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B6
6.0 Application Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B6
6.1 Sensitivity and CT Ratios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B6
6.2 Tripping on facility energization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B6
6.3 CT Saturation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B9
6.4 Burden Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B9
7.0 Testing the Dual-Source Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B11
7.1 In-Service Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B11
7.2 Lab Bench Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B11

I.B. 17555C
Effective November 1999
Page iv
FIGURES
Figure Title Page
1-1 Digitrip 3000 Protective Relay (Front View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-2 Digitrip 3030 Protective Relay (Rear and Side Views) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1-3 Digitrip 3000 Protective Relay with DIP Switches Shown in Upper Left (Rear View) . . . . . . . . . . . . . . . . 4
1-4 Digitrip 3000 Curve Shape Possibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1-5 Installed Jumpers in Place on Terminal Block TB-1 Disabling the Zone Interlocking Feature . . . . . . . . . 5
2-1 Typical Communications Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3-1 Digitrip 3000 Typical Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3-2 Digitrip 3000 Time-Current Characteristic Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3-3 Sample Electronic Trip Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3-4 Typical Inverse Time Overcurrent Pickup Horizontal Movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3-5 Typical Time Multiplier Adjustment (I2T Response) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3-6 Short Delay Setting Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3-7 Short Delay Time Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3-8 Typical Curve with I 2T Shape. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3-9 Instantaneous Setting Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3-10 Programming Sequence Preview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3-11 Local Programming Sequence Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4-1 Connection Diagram for Typical Phase Zone Selective Interlocking . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4-2 Connection Diagram for Typical Ground Zone Selective Interlocking. . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5-1 Cutout Dimensions (Inches) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5-2 Digitrip 3000 Protective Dimensions (Inches). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7-1 Inverse Time Overcurrent Phase, I4T Curves (SC-5390-92B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7-2 Inverse Time Overcurrent Phase, I2T Curves (SC-5391-92B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7-3 Inverse Time Overcurrent Phase, IT Curves (SC-5392-92B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7-4 Inverse Time Overcurrent Phase, Flat Curves (SC-5393-92B). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7-5 Short Delay Phase Curves (SC-5394-92B). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7-6 Inverse Time Overcurrent/Short Delay Curves (SC-5395-92B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7-7 Instantaneous Curves (SC-5396-92B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7-8 Inverse Time Overcurrent Ground, I4T Curves (SC-5399-92B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7-9 Inverse Time Overcurrent Ground, I2T Curves (SC-5400-92B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
7-10 Inverse Time Overcurrent Ground, IT Curves (SC-5401-92B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7-11 Inverse Time Overcurrent Ground, Flat Curves (SC-5402-92B). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7-12 Short Delay Ground Curves (SC-5403-92B). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7-13 ANSI Moderately Inverse Curves (SC-6685-96). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7-14 ANSI Very Inverse Curves (SC-6686-96) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7-15 ANSI Extremely Inverse Curves (SC-6687-96). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7-16 IEC-A Moderately Inverse Curves (SC-6688-96) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7-17 IEC-B Very Inverse Curves (SC-6689-96) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
7-18 IEC-C Extremely Inverse Curves (SC-6690-96) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
7-19 IEC-D Flat Curves (SC-6691-96) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
A-1 Digitrip 3001 Drawout Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
A-2 DT3001 Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2

I.B. 17555C
Effective November 1999
Page v
FIGURES
Figure Title Page
A-3 Rear View of DT3001 Drawout Outer Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A3
A-4 DT3001 Typical AC or DC Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A4
A-5 DT3001 Typical AC External Current Connection with Zero Sequence Ground CT . . . . . . . . . . . . . . . A4
A-6 DT3001 Typical Residual Ground Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A4
A-7 DT3001 Typical Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A5
A-8 Typical Phase Zone Selective Interlocking Connection Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A6
A-9 Typical Ground Zone Selective Interlocking Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A6
B-1 Digitrip 3000 with DSPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B2
B-2 Digitrip 3010/3020 Dimensions (Inches). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B5
B-3 Digitrip 3010/3020 Typical Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B7
B-4 Digitrip 3010/3020 Protective Relay Typical AC Schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B8
B-5 Digitrip 3010/3020 Typical AC External Current Connection with Zero Sequence Ground CT . . . . . . . B8
B-6 Digitrip 3010/3020 Typical Residual Ground Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B8
B-7 Digitrip 3010/3020 Protective Relay Burden Curves - OHMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B10
B-8 Digitrip 3010/3020 Protective Relay Burden Curves - Power in VA . . . . . . . . . . . . . . . . . . . . . . . . . . . B10
B-9 Digitrip 3010/3020 Protective Relay CT Voltage Drop Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B12
B-10 DSPS Output Voltage to Relay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B12

I.B. 17555C
Effective November 1999
Page vi
TABLES
Table Title Page
1.1 DT3000 Protective Relay Family Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 DT3000 Drawout Case Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.1 Curve Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Characteristic for Phase Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Characteristic for Ground Element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Miscellaneous Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 Factory Set Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Digitrip 3000 Curve Shapes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2 Digitrip 3000 Display Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1 Digitrip 3000 Dip Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.1 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
A-1 Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
A-2 Additional Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
A-3 DT3001 Drawout Relay Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2
B-1 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1
B-2 DT3010 and DT3020 Specification and Test Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B2

I.B. 17555C
Effective November 1999
Page 1
SECTION 1: INTRODUCTION
1-1 PRELIMINARY COMMENTS AND SAFETY
PRECAUTIONS
This Technical document covers most aspects associated
with the installation, application, operation, and mainte-
nance of the Cutler-Hammer Digitrip 3000 Family of Pro-
tective Relays. Table 1.1 shows all of the DT3000 Family
products that are covered by this Instruction Book. Prod-
uct-specific type specifications are defined in the Appen-
dices at the end of this book. ANY INFORMATION IN
THE APPENDICES SUPERCEDES THAT IN THE MAIN
PORTION OF THIS BOOK.
For DT3001 and DT3031 Drawout Case styles, replace-
ment parts can be ordered separately. Refer to Table 1.2
for a list of these style numbers.
NOTE: THE TERM “DT3000”, AS USED IN THIS
INSTRUCTION BOOK I.B. 17555C, 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 STYLE DIFFERENTIATION IS
APPLICABLE.
This document is provided as a guide for authorized and
qualified personnel only in the selection and application
of the Digitrip 3000 Protective Relay. Please refer to the
specific WARNING and CAUTION in Section 1-1.2 before
proceeding. If further information is required by the pur-
chaser regarding a particular installation, application or
maintenance activity, a Cutler-Hammer representative
should be contacted.
Notes:
1. Additional product specifications and information in Appendix A
2. Additional product specifications and information in Appendix B
3. Additional product specifications and information in the Addendum to I.B. 17555 Style No. 8163A30H02.
TABLE 1.1 DT3000 PROTECTIVE RELAY FAMILY STYLES
DT3000
STYLE # CAT. # DESCRIPTION NOTES
4D13120G11 DT3000 DT3000 Protective Relay
4D13120G12 DT3100 DT3000 Protective Relay Chicago Version See Note 3
4D13120G04 DT3030 DT3030 Protective Relay
(24-48Vdc CE Mark Version)
4D13124G11 DT3001 DT3000 Drawout Case Protective Relay See Note 1
4D13124G12 DT3101 DT3000 Chicago Version Drawout Case Protective Relay See Note 3
4D13124G04 DT3031 DT3030 Drawout Case Protective Relay
(24-48Vdc CE Mark Version) See Note 1
4D13125G11 DT3010 DT3000 Protective Relay with 120Vac Dual-Source Power Supply See Note 2
4D13125G12 DT3020 DT3000 Protective Relay with 240Vac Dual-Source Power Supply See Note 2
TABLE 1.2 DT3000 DRAWOUT CASE REPLACEMENT PARTS
DT3000
STYLE # CAT. # DESCRIPTION NOTES
66D2001G01 DT3001-IC MTO DT3000 Drawout Case Protective Relay Inner Chassis See Note 1
66D2001G02 DT3101-IC MTO DT3000 Chicago Version Drawout Case Protective Relay See Note 3
66D2001G04 DT3031-IC MTO DT3030 Drawout Case Protective Relay Inner Chassis See Note 1
66D2005G01 DT3001-OC DT3000 Drawout Case Outer Chassis
(For use with DT3XXX-IC Protective Relays) See Note 1

I.B. 17555C
Effective November 1999
Page 2
1-1.1 WARRANTY AND LIABILITY INFORMATION
NO WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING WARRANTIES OF FITNESS FOR A PAR-
TICULAR PURPOSE OF MERCHANTABILITY, OR
WARRANTIES ARISING FROM COURSE OF DEALING
OR USAGE OF TRADE, ARE MADE REGARDING THE
INFORMATION, RECOMMENDATIONS AND DESCRIP-
TIONS CONTAINED HEREIN. In no event will Cutler-
Hammer be responsible to the purchaser or user in con-
tract, in tort (including negligence), strict liability or other-
wise 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 sys-
tem, 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.
WARNING
THE WARNINGS AND CAUTIONS INCLUDED AS
PART OF THE PROCEDURAL STEPS IN THIS DOCU-
MENT ARE FOR PERSONNEL SAFETY AND
PROTECTION OF EQUIPMENT FROM DAMAGE. AN
EXAMPLE OF A TYPICAL WARNING LABEL HEAD-
ING IS SHOWN ABOVE TO FAMILIARIZE
PERSONNEL WITH THE STYLE OF PRESENTATION.
THIS WILL HELP TO INSURE THAT PERSONNEL ARE
ALERT TO WARNINGS, WHICH MAY APPEAR
THROUGHOUT THE DOCUMENT. IN ADDITION, CAU-
TIONS ARE ALL UPPER CASE AND BOLDFACE.
CAUTION
COMPLETELY READ AND UNDERSTAND THE MATE-
RIAL PRESENTED IN THIS DOCUMENT BEFORE
ATIEMPTING INSTALLATION, OPERATION OR APPLI-
CATION OF THE EQUIPMENT. IN ADDITION, ONLY
QUALIFIED PERSONS SHOULD BE PERMITTED TO
PERFORM ANY WORK ASSOCIATED WITH THE
EQUIPMENT. ANY WIRING INSTRUCTIONS PRE-
SENTED IN THIS DOCUMENT MUST BE FOLLOWED
PRECISELY. FAILURE TO DO SO COULD CAUSE
PERMANENT EQUIPMENT DAMAGE.
1-2 GENERAL INFORMATION
The Digitrip 3000 Protective Relays panel mounted multi-
function, microprocessor based overcurrent relays,
designed for both ANSI and IEC applications (Figures 1-1
and 1-2). It is a self-contained device which operates
from either AC or DC control power (DC only for the
DT3030 & DT3031), and provides true RMS sensing of
each phase and ground current. Only one relay is
required per three-phase circuit. Current monitoring and
operator selectable protective functions are integral to
each device.
Fig. 1-1 Digitrip 3000 Protective Relay (Front View)
CAUTION
THE LOSS OF CONTROL VOLTAGE WILL CAUSE THE
DIGITRIP 3000 TO BE INOPERATIVE. IF AC CONTROL
VOLTAGE IS USED, AN APPROPRIATE RELIABLE
POWER SOURCE/SCHEME SHOULD BE SELECTED
(POSSIBLY A UPS SYSTEM) TO SUPPLY POWER TO
THE RELAY.
The Digitrip 3000 Protective Relay provides protection for
most types of medium voltage electrical power distribu-
tion systems. It was designed for use with Cutler-Ham-
mer Type VCP-W vacuum circuit breakers, as well as
other manufacturers’ medium and high voltage circuit
breakers. Digitrip 3000 Protective Relays are compatible
for use with all circuit breakers utilizing a shunt trip coil.

I.B. 17555C
Effective November 1999
Page 3
Thermal curves, plus ANSI and IEC inverse time overcur-
rent curves provide close coordination with both down-
stream and upstream protective devices. One Digitrip
3000 Protective Relay replaces the normal complement
of three or four conventional electro-mechanical overcur-
rent relays, an ammeter, a demand ammeter, an amme-
ter switch, and, in some situations, a lockout relay switch
(device 86). All Digitrip 3000 Protective Relays include a
built-in INCOM communication capability compatible with
the Cutler-Hammer PowerNet and IMPACC Systems.
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 sec-
ondary output of standard switchgear current transform-
ers rated at = 5 amperes. It is operator configured to fit
specific distribution system requirements. The current
transformer ratio information is programmed into Digitrip
3000 by setting pushbuttons located on the faceplate of
the relay. The phase and ground CT ratios can be inde-
pendently programmed over a range of 5:5 to 5000:5.
Refer to Table 2.4 for all available CT ratio settings.
Protective functions are also configured by using the
pushbuttons on the faceplate of the relay. These protec-
tive functions can be programmed with the circuit breaker
in the open or closed position. DIP Switch S2, located on
the rear of the relay, is used to control closed breaker set-
ting ability (Figure 1-3). Refer to Paragraph 2-2.2 and
Table 5.1 for additional information. Inverse time over-
current protection for the phase element cannot be dis-
abled. 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 min-
utes. Programming and test mode security is provided by
a sealable, hinged access cover on the front of the relay.
Direct reading displays indicate the value currently being
considered, while multi-colored LEDs indicate opera-
tional conditions and specific functions (Figure 1-1).
In addition to performing a continuous self-testing of
internal circuitry as a part of normal operation, all Digitrip
3000 Protective Relays include a front accessible, inte-
gral field testing capability. In the integral test mode, a
test current simulates an overload or short circuit condi-
tion, to check that all tripping features are functioning
properly. The test function is user selectable to trip or not
trip the breaker. Refer to Paragraph 2-1.5 for additional
information.
Fig. 1-2 Digitrip 3030 Protective Relay (Rear and Side Views)

I.B. 17555C
Effective November 1999
Page 4
The Digitrip 3000 Protective Relay provides five protec-
tive functions for both phase and ground protection. The
ground element is capable of a residual, an external
source ground or a zero sequence connection. If ground
protection is not desired, the ground element does not
have to be connected.
The five protective settings are:
• Inverse Time Overcurrent Pickup
• Inverse Time Overcurrent Time Multiplier
• Short Delay Pickup
•ShortDelayTime
• Instantaneous Pickup
Each of the protective functions are independently pro-
grammed 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. If not desired, the discrimina-
tor can be disabled.
Fig. 1-3 Digitrip 3000 Protective Relay with DIP
Switches Shown in Upper Left (Rear View)
Digitrip 3000 Protective Relays provide greater selective
coordination potential by providing 11 different curve
shapes (Figure 1-4).
• Thermal Curves (4 shapes)
- It
- I2t
- I4t
- Flat
• ANSI Curves (3 shapes per ANSI C37.112)
- Moderately Inverse
- 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.
With this vast selection of Curve Shapes, Digitrip 3000
provides protection capable of coordinating with most any
existing electro-mechanical overcurrent relay or power
fuse.
A pictorial representation of characteristic curve shapes
is provided on the face of the relay for reference pur-
poses (Figure 1-1).
All Digitrip 3000 Protective Relays have zone selective
interlocking capabilities for phase and ground fault pro-
tection. 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 dis-
abled by the use of the two jumpers on the rear mounted
terminal strip TB1 (Figure 1-5).
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 informa-
tion can be transmitted to a remote location via the built-
in INCOM communication system. This type of informa-
tion is referred to as “COMMUNICATED INFORMATION.”

I.B. 17555C
Effective November 1999
Page 5
Fig. 1-4 Digitrip 3000 Curve Shape Possibilities
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 parame-
ters, such as:
• Individual phase currents
• Ground current
• Maximum current for each phase and ground since last
reset (Amp. Demand)
• Magnitude and phase of current causing trip
• Cause of trip
• Current transformer ratio
• Existing setpoint settings
• Software Version
The remote communications capability is made possible
by the Cutler-Hammer Integrated Communications
(INCOM) Chip and Protocol compatible with the Power-
Net Monitor and Control System. 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
Reliable two-way communications can be provided over a
twisted pair communications network. The Digitrip 3000
Protective Relay is supplied with a built-in communica-
tions capability compatible with the Cutler-Hammer Pow-
erNet system.
1-4 STANDARDS
Digitrip 3000 Protective Relays are “Component Recog-
nized” by the Underwriters Laboratory, Inc.®under UL
File E154862. Refer to Section 2-3 UL Testing and Spec-
ification Summary for more information.
Fig. 1-5 Installed Jumpers in Place on Terminal Block
TB-1 Disabling the Zone Interlocking Feature
➀Curves shapes defined by ANSI C37.112.
➁IEC Curve shapes defined by IEC 255-3.

I.B. 17555C
Effective November 1999
Page 6
SECTION 2: FUNCTIONAL DESCRIPTION
2-1 PROTECTION, TESTING AND
COMMUNICATION CAPABILITIES
2-1.1 RMS SENSING
Digitrip 3000 Protective Relaysprovide 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
root mean square 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 dis-
crete, preselected value of current used to initiate a trip-
ping action. The Digitrip 3000 has several current based
tripping functions:
• Phase inverse time overcurrent tripping - Thermal,
ANSI, and IEC Curves.
• Ground inverse time overcurrent tripping - Thermal,
ANSI, and IEC Curves. Ground selection is indepen-
dent of phase selection.
• Phase and ground short delay tripping.
• Phase and ground instantaneous tripping.
As shown in Figure 3-1, the ANSI and IEC “Curve
Shapes” are in terms of multiples of Ipu (Pickup
Current of the CT Primary), whereas ‘short delay”
and “instantaneous” are in terms of multiples of In
(5A secondary of CT primary current). The thermal
curve is represented in terms of multiples of Infor 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 Instanta-
neous settings using In
CT Rating = In= 1200A.
Pickup Setting= 1.5
Pickup (amps)= (1 200)(1 .5)
= 1800A.
Example: ANSI and lEC curves using Ipu
CT Rating = 1200A.
Ipu = Pickup Current = 1800A.
CT Ratio = 1200:5 (Entered as “1200”)
Actual secondary current at pickup =
7.5A = (1800/1200) x 5
2-1.3 TIME SETTING
A Digitrip 3000 Protective Relay time setting is a prese-
lected 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.
No memory is provided. If the current value does not
drop below pickup, the amount of delay before tripping
occurs is a function of the current magnitude and the time
setting. The delay can be determined from the appropri-
ate time-current curves.
2-1.4 PROTECTION CURVE SETTINGS
Curve Selection: Extensive flexibility on inverse time
overcurrent (phase and ground) curve shaping is possi-
ble 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.
Phase Inverse Time Overcurrent Pickup: The available
pickup settings, shown in Table 2.2, range from 0.20 to
2.2 times (In).
TABLE 2.1 CURVE SELECTION
Curve Type Selection Result
Thermal It
I2t
I4t
FLAT
Moderately Inverse
Inverse
Extremely Inverse
Definite or Fixed Time
ANSI MOD
VERY
XTRM
Moderately Inverse
Very Inverse
Extremely Inverse
lEC lEC-A
lEC-B
lEC-C
IEC-D
Moderately Inverse
Very Inverse
Extremely Inverse
Definite Time

I.B. 17555C
Effective November 1999
Page 7
TABLE 2.2 CHARACTERISTIC FOR PHASE ELEMENT
TYPE SETTING AVAILABLE SETTINGS TOLERANCE CURVE #
CURVE SHAPE IT, I2T, I4T, FLAT, MOD, VERY, XTRM,
IECA, IECB, IECC, IECD
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, 0.95,1.00,1.10,1.20,1.30,1.40,
1.50,1.60, 1.70,1.80,1.90,2.00,2.10,
2.20
±5%
INVERSE TIME OVERCURRENT
TIME MULTIPLIER
Curve = IT, I
2
T, I
4
T:
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
+10%➀ ➁
± 0.05 SEC
±10%➀ ➂
±10%➀ ➂ ➃
IT SC-5392-92B
I2T SC-5391-92B
I4T SC-5390-92B
FLAT
SC 5393-92B
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
SHORT DELAY PICKUP 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
± 10% SC-5394-92B
SHORT DELAY TIME
(In Seconds) 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
± 0.05 SEC SC-5394-92B
INSTANTANEOUS PICKUP 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
± 10% SC-5396-92B
DISCRIMINATOR
(If Phase INST set to NONE) D ON Fixed At 11 x In
D OFF +10%
NOTES: ➀Curves go to constant operating time above 30 X In.
➁Tolerance: ± 10% or 0.09 seconds, whichever is larger. Minimum operating trip time is 0.05 seconds.
➂Tolerance: ± 10% or 0.09 seconds, whichever is larger (>1.5 x Ipu). Minimum trip time is 2 power line cycles.
➃For IECD, the Time Multiplier Tolerance is ±0.05 seconds.

I.B. 17555C
Effective November 1999
Page 8
TABLE 2.3 CHARACTERISTIC FOR GROUND ELEMENT
TYPE SETTING AVAILABLE SETTING TOLERANCE CURVE #
CURVE SHAPE IT, I2T, I4T, FLAT, MOD, VERY, XTRM,
IECA, IECB, IECC, IECD
INVERSE TIME OVERCURRENT
PICKUP
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
+ 5%
INVERSE TIME OVERCURRENT
TIME MULTIPLIER
Ground Time Multiplier setting options
depend upon Ground Curve setting
selection.
Curve = IT, I
2
T, I
4
T:
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
±10%➀ ➁ ➄
±0.05 SEC
±10%➀ ➂ ➄
±10% ➀ ➂ ➄
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
SHORT DELAY PICKUP 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
+ 10% SC-5403-92B
SHORT DELAY TIME
(In Seconds) 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
+ 0.05 SEC SC-5403-92B
INSTANTANEOUS PICKUP 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
+ 10% SC-5396-92B
NOTES: ➀Curves go to constant operating time above 30 X In.
➁Tolerance: ± 10% or 0.09 seconds, whichever is larger. Minimum operating trip time is 0.05 seconds.
➂Tolerance: ± 10% or 0.09 seconds, whichever is larger (>1.5 x Ipu). Minimum trip time is 2 power line cycles.
➃For IECD, the Time Multiplier Tolerance is ±0.05 seconds.
➄For Ground Pickup ≤0.2pu: trip time tolerance is ±15%.

I.B. 17555C
Effective November 1999
Page 9
Phase Inverse Time Overcurrent Time Multiplier:
The available time settings, shown in Table 2.2, 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 set-
tings represent the relay’s time multiplier for the current
value equal to I/Ipu.
Phase Short Delay Pickup: The available pickup set-
tings, shown in Table 2.2, range from 1 to 11 times (In) or
NONE. If NONE is selected, the short delay protective
function is disabled.
Phase Short Delay Time: The available time settings,
shown in Table 2.2, 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 Instantaneous: The available pickup settings,
shown in Table 2.2, 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 (In). 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 reclosed.
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 in Table 2.3. 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 discrim-
inator option for ground instantaneous, and there is a
NONE selection for the inverse time overcurrent pickup
setting.
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.
TABLE 2.4 MISCELLANEOUS SETTINGS
TYPE SETTING AVAILABLE SETTINGS
HIGHLOAD TIME
(pickup fixed @ 0.85 X Phase
Time Overcurrent Setting)
0 Sec, 5 Sec, 10 Sec, 30 Sec, 1 min, 2 min, 5 min
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,
3200, 4000, 5000
GROUND 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,
3200, 4000, 5000
TEST
Phase
Phase Trip
Ground
Ground Trip
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

I.B. 17555C
Effective November 1999
Page 10
High Load: The available high load time-out settings are
shown in Table 2.4. At a current 85% or above the inverse
time overcurrent phase setting value, the high load func-
tion 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 can
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 Dip Switch #5 is in
the “On” position, the high load alarm also closes the
Communications Close Relay 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 or50Hz may
be selected (Table 2.4).
Phase and Ground CT Ratio Selection: The available
CT ratio’s, shown in Table 2.4, range from 5:5 to 5000:5.
Defaults: In the unlikely event of missing or invalid set-
tings, the Operational LED will blink Red instead of Green
and the relay will display “PRGM” in the Settings Display
window. This means that the program of settings should
be re-entered 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 over-
load 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 Table 2.4 for available test set-
tings. The “P” used in Table 2.4 refers 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 In value, which is the selected CT rating.
CAUTION
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 AUTOMATI-
CALLY EXITED, ACCOMPANIED BY AN ERROR
MESSAGE IN THE SETTINGS/TEST TIME/TRIP
CAUSE WINDOW.
TABLE 2.5 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 (Reserved)
S7: OFF (Reserved)
S8: OFF (Disable Download Setpoints)
S9: OFF (Manual Reset)
S10: OFF (Reserved)
PHASE SETTINGS
Type Default Setting
Curve Shape:
LDPU:
LDT:
SDPU:
SDT:
INST:
It
1.0
5 sec.
1.5
1.0 sec.
1.75
GROUND SETTINGS
Type Default Setting
Curve Shape:
LDPU:
LDT:
SDPU:
SDT:
INST:
It
0.5
5 sec.
0.75
1.0 sec.
1.0
MISCELLANEOUS SETTINGS
Type Default Setting
DISC: OFF
HILD: 10 sec.
FREQ: 60 Hz
CT P: 500
CT G: 500

I.B. 17555C
Effective November 1999
Page 11
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 download-
ing of set points from a remote master computer. Note:
Dip Switch #5 must be in the “Off”position to initiate
a “Communications Close”command. Communica-
tions is accomplished from the relay to the master com-
puter via a 115.2 KHz. frequency carrier signal over a
shielded twisted pair of conductors. The receiving termi-
nal is a remote mounted master computer (IBM compati-
ble). 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.
2-2 PROTECTIVE RELAY HARDWARE
2-2.1 FRONT OPERATIONS PANEL
The operations panel, which is normally accessible from
the outside of the switchgear 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. LEDs
3. Display Windows
Pushbuttons: The front operations panel supports
eleven membrane pushbuttons. Pushbuttons are color
coded (red, white, blue, yellow) by their function to be
operational friendly. For example, blue pushbuttons are
associated with actual program functions, yellow push-
buttons with integral testing functions, and white pushbut-
tons 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 follow-
ing: the trip relays (overcurrent and instantaneous), the
trip alarm relay, the trip LEDs, 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 the sealable, hinged access cover, is used to
enter and exit the program mode. When this pushbutton
is pressed and released, the program LED flashes and
setpoints 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. Any
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 min-
utes.
Note: Each Digitrip 3000 is shipped from the factory
with nominal protection settings. The relay should be
programmed by the user before being put into
service, as these nominal values may not give
optimum system protection or coordination. Remove
tag from security door to access the “Program
Mode”pushbutton.
Test Mode Pushbutton (Yellow)
Also located behind the sealable 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 (In) current flowing in either the
phase or the ground circuit, the Test Mode cannot be initi-
ated and the error message “ERR” will appear in the dis-
play window. The test mode will also automatically be
exited if there is no activity for 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).

I.B. 17555C
Effective November 1999
Page 12
Fig. 2-1 Typical Communications Wiring Diagram

I.B. 17555C
Effective November 1999
Page 13
Test Pushbutton (Yellow)
The selected test operation is initiated by pressing and
releasing the Test pushbutton.
Select Settings Pushbutton (Blue)
In the program mode of operation, the Select Settings
pushbutton is used to step to the next setpoint by press-
ing and releasing the pushbutton. 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 setpoint. The Lower pushbutton
also serves a dual function in conjunction with the Select
Settings pushbutton, as described under Select Settings
Pushbutton.
Save Settings Pushbutton (Blue)
While in the program mode, selected setpoints can be
saved by depressing and releasing the Save Settings
pushbutton. Settings can be saved individually or one
time as a group. If the Save Settings pushbutton is not
used, the previous setpoints will remain when the pro-
gram mode is exited.
View Settings Pushbutton (Blue)
The View Settings pushbutton is functional only when the
unit is in the normal operating mode, not the program or
test modes. It functions to display the unit’s set-points,
including the phase and ground current transformer ratio
selected via programming. This software version of the
DT3000 will be displayed after the ground ct ratio setting.
The software version will appear in the RMS Amperes
display window and the letters “SVER” will appear in the
Settings display window.
Select Pushbutton (White)
The Select pushbutton is used to step between any of the
eight current values that are displayed in the RMS
Amperes window. The eight currents are IA, IB, IC, IG, IA
ampere demand, lB ampere demand, IC ampere
demand, and IG ampere demand. Stepping with this
pushbutton is in the sequence just given. The currents
displayed are the present RMS values; the ampere
demand currents are the averaged RMS values sensed
over a 5 minute period of time. The demand value is the
largest 5 minute average measured since the amp
demand was last reset.
LEDs: LEDs are used to indicate a number of functions,
operations and/or warnings. Many of the LEDs used pro-
vide different indication messages. The specific message
is determined by the color and a constant on or blinking
operation. Several of the LEDs 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 repro-
gramming. 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 replace-
ment of the relay.
High Load LED
The High Load LED will blink green when high load set-
tings are being selected in the program mode. In the
operational or test modes, the High Load LED will blink
red when a load current of 85% or above the inverse time
overcurrent phase pick-up setting is reached. If the load
current remains at 85% or above the inverse time over-
current 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.
Communication Trip LED
This LED, will be continuous red when the breaker has
been tripped by the master computer via INCOM. The
LED will turn off when the Reset pushbutton is pressed or
the circuit breaker is reclosed.
Curve Shape LED
This LED will blink green when the slope setpoint is dis-
played 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 setpoint is displayed in the Settings/Test Time/Trip
Cause window. It will be a continuous green when the
inverse time overcurrent pickup setpoint 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 setpoint. If the relay trips on inverse
time overcurrent, the LED will be continuous red.
Inverse Time Overcurrent Time LED
This LED will blink green when the LED time overcurrent
time setpoint is displayed in the Settings/Test Time/Trip
Cause window while in the program mode. When the
time multiplier is being viewed in the unit’s normal operat-
ing mode, the LED is continuous green.

I.B. 17555C
Effective November 1999
Page 14
Short Delay Setting LED
This LED is bi-colored and operates like the time over-
current 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 setpoints are displayed in the Settings/Test
Time/Trip Cause window while in the program mode.
When these setpoints are viewed in the normal operating
mode, this LED will be continuous green.
The LED will blink red, along with the time overcurrent
setting LED whenever the phase load current exceeds
the inverse time overcurrent pickup setpoint.
The LED will be continuous red, whenever a trip is initi-
ated by the phase inverse time overcurrent, short delay,
or instantaneous protective functions.
Ground LED
The ground LED is also bi-colored (green/red). The
ground LED operates exactly like the phase LED for all
ground associated functions.
Amp Demand LED
This LED will be continuous green when an ampere
demand current is being viewed in the RMS Amperes
window.
IA, IB, IC, IGLEDs
The specific phase or ground current LEDs will be contin-
uous green when that phase or ground current is being
displayed in the RMS Amperes window. When the Amp
Demand LED is also lit, the displayed current is the
Ampere Demand Current.
Program LED
This LED is continuous green when the relay is in the
program mode.
Test LED
This LED is continuous green when the relay is in the test
mode.
Display Windows: Two windows are used to display all
of the relay’s data, setpoints 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 LEDs. It is labeled Settings/Test Time/Trip
Cause.
RMS Amperes Window
This window has a five digit numeric display. It is used to
show:
1. Present phase or ground currents
2. Largest phase or ground demand currents since last
reset
3. Fault current (displayed after a trip until a reset action
is initiated)
4. 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 Trip Cause Window
alphanumeric display used to show the value of the set-
points, the test time, or 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 acces-
sible from the rear of an open panel door (Figure 2-1). 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 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 func-
tions and connections involved, especially the following:
DIP Switches: A set of ten DIP switches are located in
the upper left portion of the rear panel. Refer to Table 5.1
for DIP switch positions. Their basic functions are as fol-
lows: