Name: Sel SEL-351A
Brand: Sel
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SEL-351A

DISTRIBUTION PROTECTION SYSTEM

DIRECTIONAL OVERCURRENT RELAY

RECLOSING RELAY

FAULT LOCATOR

INTEGRATION ELEMENT STANDARD

INSTRUCTION MANUAL

SCHWEITZER ENGINEERING LABORATORIES, INC.

2350 NE HOPKINS COURT

PULLMAN, WA USA 99163-5603

TEL: (509) 332-1890 FAX: (509) 332-7990

Cover1
MANUAL CHANGE INFORMATION3
Table of Contents7
Section 1: Introduction and Specifications9
- INTRODUCTION AND SPECIFICATIONS11
Section 2: Installation27
- INSTALLATION29
Section 3: Overcurrent, Voltage, Synchronism Check, and Frequency Elements51
- OVERCURRENT, VOLTAGE, SYNCHRONISM CHECK, AND FREQUENCY ELEMENTS55
Section 4: Loss-of-Potential, Load Encroachment, and Directional Element Logic105
- LOSS-OF-POTENTIAL, LOAD ENCROACH˜MENT, AND DIRECTIONAL ELEMENT LOGIC107
Section 5: Trip and Target Logic143
- TRIP AND TARGET LOGIC145
Section 6: Close and Reclose Logic159
- CLOSE AND RECLOSE LOGIC161
Section 7: Inputs, Outputs, Timers, and Other Control Logic193
- INPUTS, OUTPUTS, TIMERS, AND OTHER CONTROL LOGIC197
Section 8: Breaker Monitor and Metering243
- BREAKER MONITOR AND METERING245
Section 9: Setting the Relay277
- SETTING THE RELAY279
Settings Sheet309
- Identifier Labels (See Settings Explanations in Section 9)309
- Current and Potential Transformer Ratios (See Settings Explanations in Section 9)309
- Line Settings (See Settings Explanations in Section 9)309
- Instantaneous/Definite-Time Overcurrent Enable Settings309
- Time-Overcurrent Enable Settings309
- Other Enable Settings310
- Phase Inst./Def.-Time Overcurrent Elements (See Figures 3.1, 3.2, and 3.3)310
- Phase Definite-Time Overcurrent Elements (See Figure 3.3)310
- Phase-to-Phase Instantaneous Overcurrent Elements (See Figure 3.7)310
- Neutral Ground Inst./Def.-Time Overcurrent Elements—Channel IN (See Figures 3.8 and€3.9)311
- Neutral Ground Definite-Time Overcurrent Elements (See Figure 3.8)311
- Residual Ground Inst./Def.-Time Overcurrent Elements (See Figures 3.10 and 3.11)311
- Residual Ground Definite-Time Overcurrent Elements (See Figure 3.10)311
- Negative-Sequence Inst./Def.-Time Overcurrent Elements (See Figures 3.12 and 3.13)*312
- Negative-Sequence Definite-Time Overcurrent Elements (See Figure 3.12)*312
- Phase Time-Overcurrent Element (See Figure 3.14)312
- A-Phase Time-Overcurrent Element (See Figure 3.15)312
- B-Phase Time-Overcurrent Element (See Figure 3.16)312
- C-Phase Time-Overcurrent Element (See Figure 3.17)313
- Neutral Ground Time-Overcurrent Element—Channel IN (See Figure 3.18)313
- Residual Ground Time-Overcurrent Element (See Figure 3.19)313
- Negative-Sequence Time-Overcurrent Element (See Figure 3.20)*313
- Load-Encroachment Elements (See Figure 4.2)314
- Directional Elements (See Directional Control Settings in Section 4)314
- Voltage Elements (See Figures 3.21, 3.22, and 3.23)315
- Synchronism Check Elements (See Figures 3.24 and 3.25)316
- Frequency Element (See Figures 3.27 and 3.28)316
- Reclosing Relay (See Tables 6.2 and 6.3)316
- Switch-Onto-Fault (See Figure 5.3)317
- Demand Metering Settings (See Figures 8.11 and 8.13)317
- Other Settings317
- SELogic Control Equation Variable Timers (See Figures 7.23 and 7.24)317
- Trip Logic Equations (See Figure 5.1)319
- Close Logic Equations (See Figure 6.1))319
- Reclosing Relay Equations (See Reclosing Relay in Section 6)319
- Latch Bits Set/Reset Equations (See Figure 7.13)319
- Torque Control Equations for Inst./Def.-Time Overcurrent Elements320
- Torque Control Equations for Time-Overcurrent Elements321
- SELogic Control Equation Variable Timer Input Equations (See Figures 7.23 and 7.24)321
- Output Contact Equations (See Figure 7.26)322
- Display Point Equations (only on models with LCD—See Rotating Default Display in Sections 7 and 11)322
- Setting Group Selection Equations (See Table 7.4)322
- Other Equations323
- Settings Group Change Delay (See Multiple Setting Groups in Section 7)324
- Power System Configuration and Date Format (See Settings Explanations in Section 9)324
- Front-Panel Display Operation (only on models with LCD—See Section 11)324
- Event Report Parameters (See Section 12)324
- Station DC Battery Monitor (See Figures 8.9 and 8.10)324
- Optoisolated Input Timers (See Figure 7.1)324
- Breaker Monitor Settings (See Breaker Monitor in Section 8)324
- Local Bit Labels (only on models with LCD—See Tables 7.1 and 7.2)326
- Display Point Labels (only on models with LCD—See Rotating Default Display in Sections 7 and 11)328
- Reclosing Relay Labels (See Functions Unique to the Front-Panel Interface in Section€11)329
- Protocol Settings (See Below)330
- Communications Settings330
- Other Port Settings (See Below)330
- Protocol Settings (See Below)331
- Communications Settings331
- Other Port Settings (See Below)331
- Protocol Settings (See Below)332
- Communications Settings332
- Other Port Settings (See Below)332
- Protocol Settings (See Below)333
- Communications Settings333
- Other Port Settings (See Below)333
Section 10: Serial Port Communications and Commands335
- SERIAL PORT COMMUNICATIONS AND COMMANDS337
Section 11: Front-Panel Interface (only on models with LCD)377
- FRONT-PANEL INTERFACE (ONLY ON MODELS WITH LCD)379
Section 12: Standard Event Reports and SER395
- STANDARD EVENT REPORTS AND SER397
Section 13: Testing and Troubleshooting423
- TESTING AND TROUBLESHOOTING425
Section 14: Appendices435
- APPENDIX A: FIRMWARE VERSIONS439
  - Determining the Firmware Version in Your Relay439
  - Firmware Revision History Table439
- APPENDIX B: FIRMWARE UPGRADE INSTRUCTIONS441
- APPENDIX C: SEL DISTRIBUTED PORT SWITCH PROTOCOL447
  - Settings447
  - Operation447
- APPENDIX D: CONFIGURATION, FAST METER, AND FAST OPERATE COMMANDS449
- APPENDIX E: COMPRESSED ASCII COMMANDS461
- APPENDIX F: SETTING NEGATIVE-SEQUENCE OVERCURRENT ELEMENTS469
- APPENDIX G: SETTING SELogic® CONTROL EQUATIONS477
- APPENDIX H: DISTRIBUTED NETWORK PROTOCOL (DNP) 3.00489
- APPENDIX I: USING THE SEL 251 AND SEL 267 RELAY SETTINGS IN THE SEL 351A RELAY505
- APPENDIX J: SEL-5030 acSELerator511
SEL-351A RELAY COMMAND SUMMARY513
SEL-351A RELAY COMMAND SUMMARY517

Frequency	50/60 Hz
Communication Protocols	DNP3, Modbus, IEC 61850
Mounting	Panel Mount
Display	LCD
Current Rating	5 A
Protection Functions	Overcurrent
Inputs	Analog, Digital
Outputs	Relay
Operating Temperature	-40°C to 70°C

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