Schweitzer Engineering SEL-387-0 - Figure 3.35 IEC Class C Curve (Extremely Inverse): C3

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3.74

SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601

Differential, Restricted Earth Fault, Thermal, and Overcurrent Elements

Time-Overcurrent Curves

Figure 3.35 IEC Class C Curve (Extremely Inverse): C3

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423 56789

100

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0.90

0.80

0.70

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Time in Seconds

Multiples of Pickup

Time in Cycles 60 Hz (50Hz)

3 (2.5)

6 (5)

15 (12.5)

30 (25)

60 (50)

600 (500)

150 (125)

300 (250)

1500 (1250)

3000 (2500)

6000 (5000)

Main Page

Default Chapter3
- Table of Contents3
List of Tables7
Preface13
- Manual Overview13
- Safety Information14
- General Information16
Section 1: Introduction and Specifications17
- Overview17
- Relay Functions18
- Figure 1.1 Functional Overview18
- Application Ideas20
- Figure 1.2 Transformer and Overcurrent Protection20
- Figure 1.3 Transformer and Low-Voltage Bus Protection21
- Figure 1.4 Bus and Feeder Protection21
- Figure 1.5 Unit Differential Protection22
- Model Options23
- Specifications24
Section 2: Installation27
- Overview27
- Relay Mounting27
- Figure 2.1 Relay Dimensions for Rack-Mount and Panel-Mount Models28
- Figure 2.2 Front-Panel Drawings-Models 0387X0Xxxh and 0387X1Xxxh29
- Figure 2.3 Front-Panel Drawings-Models 0387X0Xxx3 and 0387X1Xxx330
- Rear-Panel Connections31
- Figure 2.4 Rear-Panel Drawings-Models 0387X0Xxxxx and 0387X1Xxxx232
- Figure 2.5 Rear-Panel Drawings-Models 0387X1Xxxx4 and 0387X1Xxxx633
- Figure 2.6 Rear-Panel Drawings-Models 0387Xyxxxx6 and 0387Xyxxxx234
- Figure 2.7 Standard Independent Output Contact Representation36
- Table 2.1 SEL-387 Communication Cable Numbers37
- Typical AC/DC Connections38
- Figure 2.8 Example AC Connections (Three-Winding Transformer)38
- Circuit Board Configuration39
- Figure 2.9 Example DC Connections (Basic Version)39
- Table 2.2 SEL-387 Second ALARM Contact Jumper Position41
- Figure 2.10 Main Board Jumpers, Connections, and Battery Locations44
- Figure 2.11 Interface Board 2 Component Layout (Conventional Terminal Block)45
- Figure 2.12 Interface Board 4 Component Layout (Conventional Terminal Block)46
- Figure 2.13 Interface Board 6 Component Layout (Conventional Terminal Block)47
- Figure 2.14 Interface Board 2 Component Layout (Connectorized)48
- Figure 2.15 Interface Board 6 Component Layout (Connectorized)49
Section 3: Differential, Restricted Earth Fault, Thermal, and Overcurrent Elements51
- Overview51
- Differential Element51
- Figure 3.1 Percentage Restraint Differential Characteristic52
- Figure 3.2 Winding 1 Compensated Currents53
- Figure 3.3 Differential Element (87-1) Quantities (SEL-387-0)53
- Figure 3.4 Differential Element (87-1) Quantities (All but SEL-387-0)54
- Figure 3.5 Differential Element Decision Logic55
- Figure 3.6 Differential Element Harmonic Blocking Logic57
- Figure 3.7 Differential Element (87BL1) Blocking Logic (SEL-387-0)58
- Figure 3.8 Differential Element (87BL1) Blocking Logic (All but SEL-387-0)58
- Figure 3.9 DC Blocking (DCBL1) Logic (All but SEL-387-0)59
- Table 3.1 Wnctc Setting: Corresponding Phase and Direction of Correction65
- Figure 3.10 Primary Currents and Secondary Currents as Measured by the Relay71
- Restricted Earth Fault Element75
- Figure 3.11 REF Enable/Block Logic76
- Figure 3.12 REF Directional Element76
- Figure 3.13 REF Protection Output (Extremely Inverse-Time O/C)77
- Figure 3.14 REF Function, 32IOP Setting Guide79
- Temperature Measurement (SEL-387-5 and SEL-387-6 Relays)81
- Thermal Element (SEL-387-6 Relay)82
- Figure 3.15 Thermal Element Logic83
- Figure 3.16 Top-Oil and Hot-Spot Temperatures84
- Table 3.2 Examples of Cooling Stages and MVA Ratings91
- Table 3.3 Default Transformer Constants95
- Overcurrent Element98
- Figure 3.17 Example System Block Diagram98
- Table 3.4 Overcurrent Element Summary99
- Figure 3.18 50Pn1 Phase Definite-Time O/C Element, Torque Controlled100
- Figure 3.19 50Pn2 Phase Instantaneous O/C Element, Torque Controlled100
- Figure 3.20 50Pn3 and 50Pn4 Phase Instantaneous O/C Element, Nontorque Controlled100
- Figure 3.21 51Pn Phase Inverse-Time O/C Element, Torque Controlled101
- Figure 3.22 50Qn1 and 50Nn1 Sequence Definite-Time O/C Element, Torque Controlled102
- Figure 3.23 50Qn2 and 50Nn2 Sequence Instantaneous O/C Element, Torque Controlled102
- Figure 3.24 51Qn and 51Nn Sequence Inverse-Time O/C Element, Torque Controlled103
- Figure 3.25 Combined Overcurrent Example104
- Figure 3.26 51PC1 and 51NC1 Combined Inverse-Time O/C Elements105
- Figure 3.27 51PC2 and 51NC2 Combined Inverse-Time O/C Elements109
- Time-Overcurrent Curves116
- Table 3.5 Equations Associated with U.S. Curves116
- Table 3.6 Equations Associated with IEC Curves116
- Figure 3.28 U. S. Moderately Inverse Curve: U1117
- Figure 3.29 U.S. Inverse Curve: U2118
- Figure 3.30 U.S. very Inverse Curve: U3119
- Figure 3.31 U.S. Extremely Inverse Curve: U4120
- Figure 3.32 U.S. Short-Time Inverse Curve: U5121
- Figure 3.33 IEC Class a Curve (Standard Inverse): C1122
- Figure 3.34 IEC Class B Curve (very Inverse): C2123
- Figure 3.35 IEC Class C Curve (Extremely Inverse): C3124
- Figure 3.36 IEC Long-Time Inverse Curve: C4125
- Figure 3.37 IEC Short-Time Inverse Curve: C5126
Section 4: Control Logic127
- Overview127
- Optoisolated Inputs128
- Local Control Switches (All but SEL-387-0 Relay)128
- Remote Control Switches129
- Figure 4.1 Remote Control Switches Drive Remote Bits RB1 through RB16129
- Multiple Setting Groups130
- Table 4.2 Active Setting Group Switching Input Logic132
- Figure 4.2 Rotating Selector Switch for Active Setting Group Selection132
- Table 4.3 SEL OGIC Control Equation Settings for Rotating Selector Switch133
- SEL OGIC Control Equation Sets (1-3) Variables134
- Figure 4.4 Traditional Latching Relay136
- Output Contacts137
- Rotating Default Display139
- LED Targeting Logic139
- Table 4.6 LED Assignments139
- Figure 4.6 SEL-387 Front-Panel Leds139
- Trip and Close Logic142
- Figure 4.7 SEL-387 Trip Logic (TRIP1)143
- Figure 4.8 SEL-387 Close Logic (CLS1)144
- SEL OGIC Control Equations146
- Relay Word Bits149
- Table 4.9 SEL-387 Relay Word Bits and Locations149
- Table 4.10 Relay Word Bit Definitions151
- Table 4.11 Relay Word Bits Sorted Alphabetically162
Section 5: Metering and Monitoring175
- Overview175
- Metering Functions175
- Figure 5.1 SEL-387 Demand Ammeter Functions and Commands180
- Temperature Measurement (SEL-387-5 and SEL-387-6 Relays)181
- Station DC Battery Monitor181
- Figure 5.2 Station DC Battery Monitor Alarm Logic182
- Figure 5.3 Undervoltage and Overvoltage Warning and Alarm Regions182
- Breaker Monitor183
- Figure 5.4 Trip Bus Sensing with Relay Input184
- Figure 5.5 Breaker Contact Wear Curve184
- Thermal Monitor (SEL-387-6 Relay)187
- Table 5.1 Thermal Element Conditions188
- Table 5.2 Using the the Command to Access Data Reports191
- Through-Fault Event Monitor192
- Table 5.3 Through-Fault Event Monitor Settings193
- Figure 5.6 Distribution Feeder Faults Expose Transformer Bank to through Faults193
- Figure 5.7 Through-Fault Triggering, Duration, and Maximum Current194
- Figure 5.8 Cumulative I 2 T Alarm (Relay Word Bit ISQTAL)195
- Status Monitor197
- Table 5.4 Self-Test Alarm Limits199
Section 6: Setting the Relay201
- Overview201
- Settings Changes Via the Front Panel201
- Table 6.1 Serial Port SET Commands201
- Settings Changes Via the Serial Port202
- Table 6.2 SET Command Editing Keystrokes202
- Additional Relay Settings203
- Default Settings209
- Settings Sheets212
SEL-387-0, -5, -6 Relay Settings Sheets213
SEL-387-0, -5, -6 Relay Settings Sheets Example249
Section 7: Serial Port Communications and Commands285
- Overview285
- Establish Communication285
- Table 7.1 Serial Port Pin Definitions286
- Figure 7.1 SEL-387 Serial Port Connectors286
- Table 7.2 SEL-387 Communication Cable Numbers287
- Table 7.3 Serial Communications Port Pin Function Definitions290
- Communications Protocol291
- SEL ASCII Protocol Details293
- Figure 7.2 Access Level Relationship297
- Table 7.4 MET Command Choices305
- Table 7.5 Valid Password Characters307
- Table 7.6 Editing Keys for SET Commands310
- Table 7.7 Settings for each Communication Port312
- Table 7.8 TFE Command Choices320
- Table 7.9 the Command Choices321
- Table 7.10 Commands with Alarm Conditions322
- Table 7.11 Main Board Jumpers322
SEL-387 Relay Command Summary323
Section 8: Front-Panel Interface331
- Front-Panel Operation331
- Figure 8.1 SEL-387 Front-Panel User Interface331
- Pushbuttons333
- Figure 8.2 Local Control Switch Configured as an ON/OFF Switch340
- Table 8.1 Correspondence between Local Control Switch Positions and Label Settings341
- Table 8.2 Correspondence between Local Control Switch Types and Required Label Settings341
- Figure 8.3 Local Control Switch Configured as an OFF/MOMENTARY Switch341
- Figure 8.4 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch341
- Programmable LEDA, LEDB, LEDC346
- Table 8.3 Front-Panel Pushbutton Serial Port Equivalents346
- Rotating Default Display347
- Table 8.4 Dynamic Display Same-Line Overcurrent Elements350
- Table 8.5 Dynamic Display Mnemonics352
- Figures of Selected Front-Panel Menu Structures355
- Figure 8.5 METER Menu and Display Structure355
- Figure 8.6 EVENTS Display Structure356
- Figure 8.7 OTHER / BKR Menu and Display Structure357
- Figure 8.8 SET Menu and Display Structure358
Section 9: Event Reports and SER359
- Overview359
- Standard 15-, 30-, or 60-Cycle Event Reports360
- Table 9.1 Event Types362
- Figure 9.1 Example Event Summary362
- Table 9.2 Winding Event Report Current Columns364
- Figure 9.2 Example Winding Event Report364
- Table 9.3 Winding Event Report Output and Input Columns365
- Table 9.4 Digital Event Report Column Description366
- Figure 9.3 Example Digital Event Report366
- Figure 9.4 Example Differential Event Report369
- Table 9.5 Differential Event Report Current Columns370
- Table 9.6 Differential Event Report Element Columns370
- Table 9.7 Raw Winding Event Report Current Columns373
- Figure 9.5 Example Raw Winding Event Report373
- Table 9.8 Raw Winding Event Report Outputs and Inputs374
- Figure 9.6 Derivation of Event Report Current Values and RMS Current Values from Sampled Current Waveform375
- Figure 9.7 Derivation of Phasor RMS Current Values from Event Report Current Values376
- Sequential Events Recorder (SER) Event Report377
- Figure 9.8 Example SER Event Report377
- Table 9.9 Different SER Event Report Responses378
Section 10: Testing and Troubleshooting381
- Overview381
- Testing Methods and Tools381
- Table 10.1 Features to Use to Test the Relay381
- Acceptance Testing383
- Figure 10.2 Relay Part Number and Hardware Identification Sticker384
- Figure 10.3 Test Connections for Balanced Load with Three-Phase Current Sources389
- Figure 10.4 Test Connections for Balanced Load with Two-Phase Current Sources390
- Table 10.2 Instantaneous Overcurrent Elements and Corresponding Settings391
- Figure 10.5 Test Connections for Two Single Current Test Sources391
- Table 10.3 Time-Delayed Overcurrent Elements and Corresponding Settings393
- Figure 10.6 Percentage Restraint Differential Characteristic400
- Table 10.4 Connection Compensation Factor401
- Figure 10.7 Test Connections for Parallel Current Sources407
- Commissioning Testing412
- Maintenance Testing412
- Relay Troubleshooting413
- Table 10.5 Troubleshooting414
- Relay Calibration417
- Factory Assistance418
SEL-387-0, -5, -6 Relay Commissioning Test Worksheet419
Appendix A: Firmware and Manual Versions423
- Firmware423
- Table A.1 Firmware Revision History-SEL-387-0, -5, -6 Relay424
- Table A.2 Manual Revision History-SEL-387-0, -5, -6429
- Table A.3 Manual Revision History-SEL-387-0 Relay435
- Table A.4 Manual Revision History-SEL-387-5, -6 Relay437
Appendix B: SEL-300 Series Relays Firmware Upgrade Instructions441
- Overview441
- Upgrade Procedure442
- Figure B.1 Establishing a Connection443
- Figure B.2 Determining the Computer Serial Port443
- Figure B.3 Determining Communications Parameters for the Computer444
- Figure B.4 Setting Terminal Emulation444
- Figure B.5 Terminal Emulation Startup Prompt445
- Figure B.6 Correcting the Port Setting445
- Figure B.7 Correcting the Communications Parameters446
- Figure B.8 Preparing Hyperterminal for ID Command Display447
- Figure B.9 List of Commands Available in SEL448
- Figure B.10 Matching Computer to Relay Parameters449
- Figure B.11 Example Receive File Dialog Box450
- Figure B.12 Example Filename Identifying Old Firmware Version450
- Figure B.13 Downloading Old Firmware450
- Figure B.14 Selecting New Firmware to Send to the Relay452
- Figure B.15 Transferring New Firmware to the Relay452
- Table B.1 Troubleshooting New Firmware Upload453
- Figure B.16 Preparing Hyperterminal for ID Command Display456
Appendix Csel Distributed Port Switch Protocol (LMD)459
- Overview459
- Settings459
- Operation460
Appendix D: Configuration, Fast Meter, and Fast Operate Commands461
- Overview461
- Message Lists461
- Table D.1 Binary Message List461
- Message Definitions462
- Table D.2 ASCII Configuration Message List462
- Table D.3 A5CO Relay Definition Block462
- Table D.4 A5C1 Fast Meter Configuration Block463
- Table D.5 A5D1 Fast Meter Data Block466
- Table D.6 A5C2/A5C3 Demand/Peak Demand Fast Meter Configuration Messages467
- Table D.7 A5D2/A5D3 Demand/Peak Demand Fast Meter Message469
- Table D.8 A5CE Fast Operate Configuration Block469
- Table D.9 A5E0 Fast Operate Remote Bit Control471
- Table D.10 A5E3 Fast Operate Breaker Control471
- Table D.11 A5CD Fast Operate Reset Definition Block471
- Table D.12 A5ED Fast Operate Reset Command472
- Table D.13 A546 Temperature Data Block (SEL-387-5 and SEL-387-6)472
Appendix E: Compressed ASCII Commands475
- Overview475
- Table E.1 SEL-387 Compressed ASCII Commands475
- CASCII Command-General Format476
- SEL-387-0, -5 Relay477
- SEL-387-6 Relay482
Appendix F Unsolicited SER Protocol491
- Overview491
- Recommended Message Usage491
- Functions and Function Codes492
Appendix G: Distributed Network Protocol497
- Overview497
- Configuration497
- Table G.1 Data Needed to Configure a Port for DNP497
- Data-Link Operation499
- Data Access Method499
- Table G.2 Data Access Methods499
- DNP3 Documentation500
- Table G.3 SEL-387 DNP3 Device Profile500
- Table G.4 SEL-387 Relay DNP Object Table501
- Table G.5 SEL-387 Relay-Wye/Delta DNP Data Map504
- Table G.6 SEL-387-5 and SEL-387-6 Relays Continuation of Wye/Delta DNP Data Map508
- Table G.7 SEL-387-5, -6 Relay Binary Input Lookup Table510
- Point Remapping512
SEL-387-5, -6 Relay DNP Port-SET P Settings Sheets517
Appendix H: Protection Application Examples519
- Overview519
- Transformer Winding and CT Connection Compensation Settings Examples519
- Table H.1 Wnctc Setting: Corresponding Phase and Direction of Correction520
- Figure H.1 Transformer Nameplate521
- Figure H.2 Three-Line Diagram Showing System Phase-To-Transformer Bushing, CT, and CT-To-Relay Connections522
- Figure H.3 Primary Current Phasors522
- Figure H.4 Current at the Relay Terminals522
- Table H.2 (A, B, C) to (H1, H2, H3) Phase-To-Bushing Connections524
- Figure H.5 Standard System Phase-To-Transformer Bushing Connections524
- Table H.3 (A, C, B) to (H1, H2, H3) Phase-To-Bushing Connections525
- Figure H.7 Non-Standard System Phase-To-Transformer Bushing Connections525
- Figure H.9 Combination of Standard and Non-Standard Phase-To-Bushing Connection Diagram526
- Figure H.12 Primary System Currents and Currents as Seen by the Relay527
- Figure H.13 Current Flow with Reversed X-Side CT Polarity528
- Figure H.14 Current Flow with Reversed X-Side CT Polarity and Reversed Connections529
- Figure H.15 Results of Reversed X-Side CT Polarity and Reversed Connections529
- Figure H.16 Delta-Wye Transformer with Standard Phase-To-Bushing Connections531
- Figure H.17 Primary Currents and Secondary Currents as Measured by the Relay531
- Figure H.18 Delta-Wye Transformer with Non-Standard Phase-To-Bushing Connections532
- Figure H.19 Primary Currents and Secondary Currents as Measured by the Relay532
- Figure H.20 Wye-Delta Transformer with Non-Standard CT Connections on the X-Side533
- Figure H.22 Comparison of Standard and Non-Standard CT Connections on the X-Side of the Transformer534
- Figure H.23 Autotransformer with Standard Phase-To-Bushing Connections535
- Figure H.24 Primary Currents and Secondary Currents as Measured by the Relay535
- Figure H.25 Delta-Wye Transformer with Standard Phase-To-Bushing Connections with an ACB Phase Rotation536
- Figure H.27 Direction of Compensation Based on System Phase Rotation537
- Figure H.28 Primary Currents and Secondary Currents as Measured by the Relay537
- Table H.4 Quick Settings Guide for Common Transformer Configurations and Standard Connections538
- Figure H.29 Common Transformer Connections538
SEL-387 Relay Command Summary541

Schweitzer Engineering SEL-387-0 - Figure 3.35 IEC Class C Curve (Extremely Inverse): C3

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