Name: Sel 751A
Brand: Sel
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20100129

SEL-751A

Feeder Protection Relay

Instruction Manual

*PM751A-01-NB*

Default Chapter3
- Table of Contents3
List of Tables7
- List of Figures13
- Manual Overview19
Preface19
- Conventions20
- Typographic Conventions20
- Safety and General Information21
- Overview27
- Features27
Section 1: Introduction and Specifications27
- Models, Options, and Accessories28
  - Monitoring Features28
  - Communications and Control28
- Table 1.1 Voltage Input Options29
- Accessories30
- Figure 4.42 Voltage30
- Applications31
- Figure 1.1 Typical Current Connections31
- Getting Started32
- Specifications36
- Relay Placement41
- Physical Location41
Section 2: Installation41
- Overview41
- I/O Configuration42
- Relay Mounting42
- Figure 2.1 Relay Panel-Mount Dimensions42
- Figure 2.2 Slot Allocations for Different Cards43
- Base-Unit Communications Ports (Slot B)44
- Table 2.1 Communication Ports44
- Voltage Card Option45
  - Table 2.2 Communication Card Interfaces and Connectors45
  - Table 2.3 3 AVI Voltage Card Terminal Designation45
  - Enhanced Voltage Card Option with Advanced Metering and Protection Package (5 AVI)46
  - Enhanced Voltage Card Option with Monitoring Package46
  - Voltage Card Option with Arc-Flash Detection (AFD) Inputs (3 AVI/4 AFDI)46
  - I/O (3 DI/4 DO/1 AO) Card Terminal Allocation48
  - I/O Input Card48
  - RTD (10 RTD) Card Terminal Allocation48
- Figure 2.5 Current Output Jumpers52
- Figure 2.6 Voltage Output Jumpers52
- Table 2.13 Jumper Functions and Default Positions53
- Figure 2.8 Rear-Panel Connections of Selected Cards54
- Rear-Panel and Side-Panel Diagrams55
- Rear-Panel Connections55
  - Figure 2.9 Fiber-Optic Serial, Ethernet, EIA-232 Communication, 3 DI/4 DO/1 AO, and 3 AVI Voltage Option55
  - Grounding (Earthing) Connections57
  - Power Connections57
  - Serial Ports57
- Figure 2.13 Control I/O Connections-4 AI/4 AO Option in Slot D and Fiber-Optic Port in Slot B59
- Figure 2.14 Control I/O Connections-Internal RTD Option59
- AC/DC Control Connection Diagrams60
- Fail-Safe/Nonfail-Safe Tripping60
- Figure 2.15 Output OUT103 Relay Output Contact Configuration60
- Figure 2.16 OUT103 Contact Fail-Safe and Nonfail-Safe Options60
- Single Phase-Neutral VT Connection61
  - Figure 2.17 Single-Phase Voltage Connections61
  - Direct Connection62
  - Open-Delta VT Connection62
  - Wye-Wye VT Connection62
- Figure 2.19 Typical Current Connections63
- Figure 2.20 SEL-751A Provides Overcurrent Protection and Reclosing for a Distribution Feeder (Includes Fast Bus Trip Scheme) (Delta-Connected Pts)64
- Figure 2.21 SEL-751A Provides Overcurrent Protection for a Distribution Bus (Includes Fast Bus Trip Scheme) (Wye-Connected Pts)65
- Figure 2.22 SEL-751A Provides Overcurrent Protection for a Delta-Wye Transformer Bank (Wye-Connected Pts)66
- Figure 2.23 SEL-751A Provides Overcurrent Protection for a Transformer Bank with a Tertiary Winding (Wye-Connected Pts)67
- Figure 2.24 SEL-751A Provides Overcurrent Protection for an Industrial Distribution Feeder (Core-Balance Current Transformer Connected to Channel IN)68
- Arc-Flash Protection: System Installation69
- Light-Sensor Installation69
- Figure 2.25 SEL-751A with an Arc-Flash Option Card and Fiber-Optic-Based Point-Sensor69
- Figure 2.26 Jacketed-Fiber Installation Example70
- Figure 2.27 Connecting Sensor Fibers to the Relay70
- Figure 2.28 Point-Sensor Assembly70
- Figure 2.29 Point-Sensor Installation71
- Figure 2.30 Point-Sensor Directivity (0-360° Around the Mounting Plane)71
- Figure 2.31 Point-Sensor Directivity (Front to Back, above the Mounting Plane)72
- Bare-Fiber Sensor Installation73
- Figure 2.33 Bare-Fiber Sensor Assembly73
- Figure 2.34 Bare-Fiber Sensor Mounting Example73
- Figure 2.35 Bare-Fiber Sensor Components (V-Pin Style)73
- Application Example74
- Figure 2.36 Bare-Fiber Sensor Showing Transition from Bare- to Jacketed-Fiber Section74
- Field Serviceability75
  - Figure 2.37 Switchgear Application Example75
  - Fuse Replacement76
  - Real-Time Clock Battery Replacement76
  - Quickset SEL-5030 Software77
Section 3: PC Software77
- Overview77
- Table 3.1 SEL Software Solutions77
- Setup78
- Figure 3.4 Tools Menu80
- Figure 3.5 Device Response to the ID Command80
- Settings Database Management and Drivers81
  - Active Database81
  - Database Manager81
- Settings82
- Figure 3.9 Expressions Created with Expression Builder86
- Event Analysis87
  - Event Waveforms87
  - Text Files87
- Figure 3.10 Composite Screens for Retrieving Events87
- Meter and Control88
- Figure 3.11 Saving the Retrieved Event88
- Figure 3.12 Device Overview Screen89
- Figure 3.13 Control Screen90
- Figure 3.14 Remote Operation Selection90
- Table 3.4 Help91
- Protection and Logic Functions93
Section 4: Protection and Logic Functions Overview94
- Application Data95
- Group Settings (SET Command)95
- Table 4.1 Identifier Settings95
- Table 4.2 CT Configuration Settings95
- Table 4.3 Voltage Configuration Settings96
- Basic Protection97
  - VNOM Range Check97
  - Overcurrent Elements97
- Table 4.4 Maximum Phase Overcurrent Settings97
- Table 4.5 Neutral Overcurrent Settings98
- Figure 4.1 Instantaneous Overcurrent Element Logic99
- Table 4.6 Residual Overcurrent Settings100
- Figure 4.2 Ground Fault Protection Using Core-Balance CT100
- Time-Overcurrent Elemetns101
- Table 4.7 Negative-Sequence Overcurrent Settings101
- Table 4.8 Phase A, B, and C Time-Overcurrent Settings102
- Table 4.9 Maximum Phase Time-Overcurrent103
- Figure 4.3 Phase Time-Overcurrent Elements 51AT, 51BT, and 51CT103
- Table 4.10 Negative-Sequence Time-Overcurrent Settings104
- Figure 4.4 Maximum Phase Time-Overcurrent Elements 51P1T and 51P2T104
- Table 4.11 Neutral Time-Overcurrent Settings105
- Figure 4.5 Negative-Sequence Time-Overcurrent Element 51QT105
- Table 4.12 Residual Time-Overcurrent Settings106
- Figure 4.6 Neutral Time-Overcurrent Elements 51N1T and 51N2T106
- Time-Overcurrent Curves107
- Figure 4.7 Residual Time-Overcurrent Elements 51G1T and 51G2T107
- Relay Word Bit108
- Table 4.13 Equations Associated with U.S. Curves108
- Table 4.14 Equations Associated with IEC Curves108
- Figure 4.8 U.S. Moderately Inverse Curve: U1109
- Figure 4.9 U.S. Inverse Curve: U2110
- Figure 4.10 U.S. very Inverse Curve: U3111
- Figure 4.11 U.S. Extremely Inverse Curve: U4112
- Figure 4.12 U.S. Short-Time Inverse Curve: U5113
- Figure 4.13 IEC Class a Curve (Standard Inverse): C1114
- Figure 4.14 IEC Class B Curve (very Inverse): C2115
- Figure 4.15 IEC Class C Curve (Extremely Inverse): C3116
- Figure 4.16 IEC Long-Time Inverse Curve: C4117
- Figure 4.17 IEC Short-Time Inverse Curve: C5118
- RTD-Based Protection119
  - RTD Input Function119
  - RTD Location119
  - Table 4.15 RTD Settings119
  - RTD Trip/Warning Levels120
  - RTD Type120
- Table 4.16 RTD Resistance Versus Temperature120
- Voltage-Based Protection121
- Table 4.17 Undervoltage Settings121
- Overvoltage Function122
  - Table 4.18 Overvoltage Settings122
  - Synchronism-Check Elements126
  - Setting SYNCPH127
  - Voltage Input VS Connected Phase-To-Phase or Beyond Delta-Wye Transformer127
  - Wye-Connected Voltages127
  - Figure 4.23 Three-Phase Power Elements Logic135
  - Table 4.20 Power Element Settings135
  - Figure 4.24 Power Elements Operation in the Real/Reactive Power Plane136
  - Figure 4.25 Power Factor Elements Logic137
  - Table 4.21 Power Factor Settings137
  - LOP Impact on Other Protection Elements138
  - LOP Monitoring and Alarms138
  - Loss-Of-Potential (LOP) Protection138
- Frequency Protection139
- Frequency Elements139
- Table 4.22 Frequency Settings139
- Figure 4.26 Loss-Of-Potential (LOP) Logic139
- Rate-Of-Change of Frequency Protection140
- Table 4.23 Rate-Of-Change-Of-Frequency Settings140
- Figure 4.27 Over- and Underfrequency Element Logic140
- Figure 4.28 81R Frequency Rate-Of-Change Scheme Logic141
- Trip/Close Logic142
- Trip/Close Logic Settings142
  - Table 4.24 Time Window Versus 81Rntp Setting142
  - TDURD Minimum Trip Time143
  - TR Trip Conditions SEL Control Equation143
- Figure 4.30 Close Logic145
- Reclose Supervision Logic146
- Close Failure Logic146
  - Figure 4.31 Reclose Supervision Logic (Following Open Interval Time-Out)146
  - Set Reclose Supervision Logic148
  - Unlatch Reclose Supervision Logic149
- Reclose Logic151
- Reclosing Relay Open Interval Time-Out151
  - Figure 4.34 Reclosing Relay States and General Operation152
  - Table 4.26 Relay Word Bit and Front-Panel Correspondence to Reclosing Relay States152
  - Lockout State153
  - Reclosing Relay States and Settings/ Setting Group Changes153
  - Close Logic Can Still Operate When the Reclosing Relay Is Defeated154
  - Defeat the Reclosing Relay154
  - Open Interval Timers155
- Figure 4.36 Reclose Blocking for Islanded Generator163
- Figure 4.37 Sequence Coordination between the SEL-751A and a Line Recloser165
- Figure 4.38 Operation of SEL-751A Shot Counter for Sequence Coordination with Line Recloser (Additional Settings Example 1)166
- Demand Metering168
- Reclose Supervision Setting (79CLS)168
- Table 4.30 Demand Meter Settings168
- Comparison of Thermal and Rolling Demand Meters169
  - Figure 4.40 Demand Current Logic Outputs169
  - Figure 4.41 Response of Thermal and Rolling Demand Meters to a Step Input (Setting DMTC = 15 Minutes)170
  - Rolling Demand Meter Response171
  - Thermal Demand Meter Response171
- Logic Settings (SET L Command)173
  - Latch Bits173
  - SELOGIC Enables173
  - Table 4.32 Latch Bits Equation Settings174
  - Make Latch Control Switch Settings with Care175
  - Nonvolatile State175
  - Power Loss175
  - Settings Change175
  - Boolean NOT Operator177
  - Math Negation Operator177
  - Parentheses Operator177
- Table 4.36 Counter Input/Output Description181
- Table 4.37 Order of Precedence of the Control Inputs181
- Figure 4.49 Example of the Effects of the Input Precedence182
- Table 4.38 Control Output Equations and Contact Behavior Settings183
- Global Settings (SET G Command)184
- Event Messenger Points184
- Table 4.39 General Global Settings184
- Table 4.40 Event Messenger Settings184
- Figure 4.50 Phase Rotation Setting184
- Synchrophasor Measurement186
- Breaker Failure Setting186
- Table 4.41 Setting Group Selection186
- Table 4.42 Breaker Failure Setting186
- Arc-Flash Protection187
- Arc-Flash Overcurrent Elements187
- Table 4.43 Arc-Flash Overcurrent Settings187
- Figure 4.51 Breaker Failure Logic187
- Table 4.44 Arc-Flash Time-Overlight Settings188
- Figure 4.52 Arc-Flash Instantaneous Overcurrent Element Logic188
- TOL Element Logic Diagram189
- Figure 4.53 Inverse Time-Overlight Element Logic189
- Setting the Arc-Flash Time-Overlight Element190
- Table 4.45 Typical Ambient Illumination Light Levels190
- Figure 4.54 TOL Element Inverse Curve Characteristic190
- Output Logic Programming191
- Analog Inputs192
  - Analog Input Calibration Process192
  - Analog Input Setting Example192
- Figure 4.55 Analog Input Card Adaptive Name192
- Table 4.46 Summary of Steps193
- Analog (DC Transducer) Input Board194
- Figure 4.56 Settings to Configure Input 1 as a 4-20 Ma Transducer194
- Analog Outputs195
- Table 4.47 Analog Input Card in Slot 3195
- Figure 4.57 Analog Output Number Allocation195
- Station DC Battery Monitor196
- Table 4.48 Output Setting for a Card in Slot 3196
- Figure 4.58 Analog Output Settings196
- Breaker Monitor197
- Digital Input Debounce197
- Figure 4.59 DC Mode Processing197
- Figure 4.60 AC Mode Processing197
- Table 4.49 Slot C Input Debounce Settings198
- Figure 4.61 Timing Diagram for Debounce Timer Operation When Operating in AC Mode198
- Data Reset199
- Access Control199
- Time Synchronization Source199
- Table 4.50 Setting Change Disable Setting199
- Port Settings (SET P Command)200
- Table 4.51 Time Synchronization Source Setting200
- Table 4.52 Front-Panel Serial Port Settings200
- Table 4.53 Ethernet Port Settings200
- Table 4.54 Fiber-Optic Serial Port Settings201
- Table 4.55 Rear-Panel Serial Port (EIA-232) Settings202
- Table 4.56 Rear-Panel Serial Port (EIA-232/EIA-485) Settings202
- Front-Panel Settings (SET F Command)203
  - Table 4.57 Rear-Panel Devicenet Port Settings203
  - Table 4.58 Display Point and Local Bit Default Settings203
  - Boolean Display Point Entry Composition204
  - Display Points204
- Table 4.59 LCD Display Settings204
- Hidden (no Display)205
  - Table 4.60 Settings that Always, Never, or Conditionally Hide a Display Point205
  - Name String, Alias String, and Either Set String or Clear String Only206
  - Name, Alias, Set String, and Clear String206
- Table 4.61 Entries for the Four Strings206
- Figure 4.62 Display Point Settings206
- Figure 4.63 Front-Panel Display-Both HV and LV Breakers Open206
- Figure 4.64 Front-Panel Display-HV Breaker Closed, LV Breaker Open206
- Analog Display Point Entry Composition207
  - Figure 4.65 Front-Panel Display-Both HV and LV Breakers Closed207
  - Figure 4.66 Front-Panel Display-HV Breaker Open, LV Breaker Closed207
  - Figure 4.67 Front-Panel Display-HV Breaker Open, LV Breaker Closed207
  - Figure 4.68 Front-Panel Display for a Binary Entry in the Name String Only207
  - Table 4.62 Binary Entry in the Name String Only207
  - Figure 4.69 Front-Panel Display for an Analog Entry in the Name String Only208
  - Table 4.63 Analog Entry in the Name String Only208
  - Table 4.64 Entry in the Name String and the Alias Strings208
  - Figure 4.70 Front-Panel Display for an Entry in (A) Boolean Name and Alias Strings and (B) Analog Name and User Text and Formatting Strings209
  - Figure 4.71 Front-Panel Display for an Entry in (A) Boolean Name and Alias Strings and (B) Analog Name, User Text and Formatting Strings, and Engineering Units209
  - Table 4.65 Example Settings and Displays209
  - Figure 4.72 Adding Temperature Measurement Display Points210
  - Figure 4.73 Rotating Display210
  - Local Bits211
  - Target LED Settings212
- Figure 4.74 Adding Two Local Bits212
- Pushbutton Leds213
- Table 4.66 Target LED Settings213
- Table 4.67 Pushbutton LED Settings213
- Report Settings (SET R Command)214
- SER Chatter Criteria214
  - Table 4.68 Auto-Removal Settings214
  - Relay Word Bitaliases215
  - SER Trigger Lists215
- Table 4.69 SER Trigger Settings215
- Table 4.70 Enable Alias Settings215
- Table 4.71 SET R SER Alias Settings215
- DNP Map Settings (Set DNP N Command, N = 1, 2, or 3)216
- Table 4.72 Event Report Settings216
- Table 4.73 Load Profile Settings216
- Table 4.74 DNP Map Settings216
- Modbus Map Settings (SET M Command)217
- Table 4.75 User Map Register Settings217
Section 5: Metering and Monitoring219
- Overview219
- Power Measurement Conventions220
- Metering220
- Figure 5.1 Complex Power Measurement Conventions220
- Fundamental Metering221
- Table 5.1 Measured Fundamental Meter Values221
- Thermal Metering222
- Table 5.2 Thermal Meter Values222
- Figure 5.2 METER Command Report with Enhanced Voltage Option with Monitoring Package222
- Energy Metering223
- Table 5.3 RTD Input Status Messages223
- Figure 5.3 METER T Command Report with Rtds223
- Figure 5.4 Device Response to the METER E Command223
- Maximum and Minimum Metering224
- Table 5.4 Maximum/Minimum Meter Values224
- Figure 5.5 Device Response to the METER RE Command224
- Math Variable Metering225
  - Figure 5.6 Device Response to the METER M Command225
  - Figure 5.7 Device Response to the METER RM Command225
  - Figure 5.8 Device Response to the METER MV Command225
  - Analog Input Metering226
  - RMS Metering226
- Table 5.5 RMS Meter Values226
- Figure 5.9 Device Response to the METER RMS Command226
- Figure 5.10 Device Response to the METER AI Command226
- Arc-Flash Light Intensity Metering227
- Table 5.6 Demand Values227
- Figure 5.11 Device Response to the METER L (Light) Command227
- Figure 5.12 Device Response to the MET de Command227
- Synchrophasor Metering228
- Table 5.7 Synchrophasor Measured Values228
- Figure 5.13 Device Response to the MET PE Command228
- Load Profiling229
- Station DC Battery Monitor229
- Figure 5.14 Device Response to the LDP Command229
- Create Desired Logic for DC Under- and Overvoltage Alarming230
  - Figure 5.15 DC Under- and Overvoltage Elements230
  - Table 5.8 Station DC Battery Monitor Settings230
  - Additional Application232
  - Analyze Station DC Battery Voltage232
  - Station DC Battery Voltage Dips During Circuit Breaker Tripping232
  - View Station DC Battery Voltage232
  - Station DC Battery Voltage Dips Anytime233
  - Station DC Battery Voltage Dips During Circuit Breaker Closing233
- Breaker Monitor233
- Table 5.9 Breaker Maintenance Information for a 25 Kv Circuit Breaker234
- Table 5.10 Breaker Monitor Settings234
- Figure 5.17 Plotted Breaker Maintenance Points for a 25 Kv Circuit Breaker235
- Breaker Maintenance Curve Details236
- Figure 5.18 SEL-751A Breaker Maintenance Curve for a 25 Kv Circuit Breaker236
- Breaker Monitor Operation Example237
  - Figure 5.19 Operation of SEL OGIC Control Equation Breaker Monitor Initiation Setting237
  - Figure 5.20 Breaker Monitor Accumulates 10 Percent Wear238
  - Figure 5.21 Breaker Monitor Accumulates 25 Percent Wear239
  - Figure 5.22 Breaker Monitor Accumulates 50 Percent Wear240
  - Figure 5.23 Breaker Monitor Accumulates 100 Percent Wear241
  - Breaker Monitor Output242
  - Via Front Panel242
  - Via Serial Port242
  - View or Reset Breaker Monitor Information242
  - Determination of Relay Initiated Trips and Externally Initiated Trips243
- Figure 5.24 Input Inxxx Connected to Trip Bus for Breaker Monitor Initiation243
Section 6: Settings245
- Overview245
- Table 6.1 Methods of Accessing Settings245
- View/Change Settings with Front Panel246
- Figure 6.1 Front-Panel Setting Entry Example247
- View/Change Settings over Communications Port248
  - View Settings248
  - Enter Settings248
- Table 6.2 SHOW Command Options248
- Table 6.3 SET Command Options248
- Setting Entry Error Messages249
- Table 6.4 SET Command Editing Keystrokes249
- Table 6.5 SET Command Format249
SEL-751A Settings Sheets251
- Identifier251
- Maximum Phase Overcurrent251
- Neutral Overcurrent252
- Residual Overcurrent252
- Negative-Sequence Overcurrent253
- Phase Time Overcurrent253
- Maximum Phase Time Overcurrent254
- Negative-Sequence Time Overcurrent255
- Neutral Time Overcurrent255
- Residual Time Overcurrent256
- Undervoltage258
- Overvoltage259
- Synchronism Check259
- Power Factor260
- Frequency260
- Rate-Of-Change of Frequency261
- Power262
- Reclosing Control262
- Sv/Timers265
- Counters Equations268
- Math Variables272
- Base Output273
- Slot C Output274
- Slot D Output274
- Slot E Output274
- Phasor Measurement (PMU)278
- Breaker Failure279
- Input Debounce Settings (Base Unit)285
- Input Debounce Settings (Slot C)285
- Input Debounce Settings (Slot D)286
- Input Debounce Settings (Slot E)286
- SET PORT P (P = F, 1, 2, 3, or 4) Command287
- Modbus292
- DNP3 Protocol292
- Mirrored Bits Protocol293
- DNP3 Map Settings (SET DNP N Command)310
- Binary Output Map313
- Analog Input Map314
Section 7: Communications319
- Overview319
- Table 7.1 SEL-751A Communications Port Interfaces319
- Communications Interfaces320
  - Figure 7.1 Simple Ethernet Network Configuration321
  - Figure 7.2 Ethernet Network Configuration with Dual Redundant Connections (Failover Mode)322
  - Figure 7.3 Ethernet Network Configuration with Ring Structure (Switched Mode)322
  - Dual Network Port Operation323
  - Failover Mode323
  - Fixed Connection Mode323
  - Unmanaged Switch Mode323
  - NETPORT Selection324
  - Port 3 (EIA-232 Option Only)324
  - Terminals B01 and B02324
- Figure 7.4 IRIG-B Input (Relay Terminals B01-B02)324
- Figure 7.5 IRIG-B Input Via EIA-232 Port 3 (SEL Communications Processor as Source)324
- Port 2 (Fiber-Optic Serial Port)325
  - Figure 7.6 IRIG-B Input VIA EIA-232 Port 3 (SEL-2401/2404/2407 Time Source)325
  - Figure 7.7 IRIG-B Input VIA Fiber-Optic EIA-232 Port 2 (SEL-2030/2032 Time Source)325
  - Figure 7.8 IRIG-B Input VIA Fiber-Optic EIA-232 Port 2 (SEL-2401/2404/2407 Time Source)325
  - +5 VDC Power Supply326
  - Connect Your PC to the Relay326
  - Port Connector and Communications Cables326
- Table 7.2 EIA-232/EIA-485 Serial Port Pin Functions326
- Figure 7.9 EIA-232 DB-9 Connector Pin Numbers326
- Figure 7.10 SEL Cable C234A-SEL-751A to DTE Device327
- Figure 7.11 SEL Cable C227A-SEL-751A to DTE Device327
- Figure 7.12 SEL Cable C222-SEL-751A to Modem327
- Figure 7.13 SEL Cable C272A-SEL-751A to SEL Communications Processor Without IRIG-B Signal328
- Figure 7.14 SEL Cable C273A-SEL-751A to SEL Communications Processor with IRIG-B Signal328
- Figure 7.15 SEL Cable C387-SEL-751A to SEL-3010328
- Communications Protocols329
  - Table 7.3 Protocols Supported on the Various Ports329
  - Ethernet Protocols330
  - FTP Server330
- SEL ASCII Protocol and Commands331
  - Message Format331
  - Ping Server331
  - Telnet Server331
  - Software Flow Control332
  - Access Levels333
  - Access Level Functions334
  - Command Summary334
- Table 7.6 Access Commands335
- AFT Command (Arc-Flash Detection Channels Self-Test)336
  - Figure 7.16 AFT Command Response337
  - Table 7.8 ANALOG Command Format337
  - BRE Command (Breaker Monitor Data)339
  - BRE Command (Preload/Reset Breaker Wear)339
  - CEV Command340
  - CLOSE Command (Close Breaker)340
  - COMMUNICATIONS Command340
  - CONTROL Command (Control Remote Bit)341
- Table 7.12 COPY Command342
- Table 7.13 COUNTER Command342
- Table 7.14 Date Command342
- Table 7.15 EVENT Command (Event Reports)343
- Table 7.16 EVENT Command Format343
- Figure 7.17 Ethernet Port (PORT 1) Status Report343
- Figure 7.18 Non-Redundant Port Response343
- Table 7.17 FILE Command344
- Table 7.18 GOOSE Command Variants344
- Table 7.19 GROUP Command346
- Figure 7.19 GOOSE Command Response346
- HELP Command347
  - Table 7.21 HISTORY Command347
  - Table 7.22 IDENTIFICATION Command347
  - Table 7.23 IRI Command347
  - LDP Command (Load Profile Report)348
  - L_D Command (Load Firmware)348
- Table 7.24 LDP Commands348
- Table 7.25 LDP Command Parameters348
- LOOPBACK Command349
  - Table 7.26 L_D Command (Load Firmware)349
  - MAC Command350
  - MET Command (Metering Data)350
  - Table 7.28 Meter Command350
  - Table 7.29 Meter Command Parameters350
  - Table 7.30 Meter Class350
  - OPEN Command (Open Breaker)351
  - PASSWORD Command (Change Passwords)351
- Table 7.31 PASSWORD Command351
- Table 7.32 PAS Command Format351
- Table 7.33 Factory Default Passwords for Access Levels 1 and 2351
- Table 7.34 Valid Password Characters352
- Figure 7.20 PING Command Response352
- PULSE Command353
- Table 7.35 PUL Outnnn Command353
- Table 7.36 QUIT Command353
- Table 7.37 R_S Command (Restore Factory Defaults)353
- Table 7.38 SER Command (Sequential Events Recorder Report)353
- Table 7.39 SER Command Format354
- Table 7.40 SER D Command354
- Table 7.41 SET Command (Change Settings)354
- SHOW Command (Show/View Settings)355
- Table 7.42 SET Command Format355
- Table 7.43 SET Command Editing Keystrokes355
- Table 7.44 SHOW Command (Show/View Settings)356
- Table 7.45 SHOW Command Format356
- Table 7.46 STATUS Command (Relay Self-Test Status)357
- Figure 7.21 SHOW Command Example357
- Table 7.47 STATUS Command Report and Definitions358
- Figure 7.22 Typical Relay Output for STATUS Command358
- Table 7.48 SUMMARY Command359
- Table 7.49 TARGET Command (Display Relay Word Bit Status)359
- Table 7.50 TARGET Command Format359
- Table 7.51 Front-Panel Leds and the TAR 0 Command359
- Table 7.52 TIME Command (View/Change Time)360
- Table 7.53 TRIGGER Command (Trigger Event Report)360
- Front-Panel Layout361
Section 8: Front-Panel Operations361
- Overview361
- Human-Machine Interface362
- Contrast362
- Figure 8.1 Front-Panel Overview362
- Access Level 2 Password Entry363
  - Figure 8.2 Access Level Security Padlock Symbol363
  - Table 8.1 Front-Panel Automatic Messages (FP_AUTO := OVERRIDE)363
  - Front-Panel Menus and Screens364
  - Front-Panel Timeout364
  - Navigating the Menus364
- Figure 8.3 Password Entry Screen364
- Figure 8.4 Front-Panel Pushbuttons364
- Meter Menu365
- Table 8.2 Front-Panel Pushbutton Functions365
- Figure 8.5 Main Menu365
- Figure 8.6 MAIN Menu and METER Submenu366
- Figure 8.7 METER Menu and ENERGY Submenu366
- Figure 8.8 Relay Response When Energy (or Max/Min, Demand, Peak Demand) Metering Is Reset366
- Figure 8.9 Relay Response When no Analog Cards Are Installed366
- Figure 8.10 Relay Response When no Math Variables Enabled367
- Figure 8.11 MAIN Menu and EVENTS Submenu367
- Figure 8.12 EVENTS Menu and DISPLAY Submenu367
- Figure 8.13 Relay Response When no Event Data Available367
- Figure 8.14 Relay Response When Events Are Cleared367
- Figure 8.15 MAIN Menu and TARGETS Submenu368
- Figure 8.16 TARGETS Menu Navigation368
- Figure 8.17 MAIN Menu and CONTROL Submenu368
- Figure 8.18 CONTROL Menu and OUTPUTS Submenu369
- Figure 8.19 CONTROL Menu and LOCAL BITS Submenu369
- Figure 8.20 MAIN Menu and SET/SHOW Submenu370
- Figure 8.21 SET/SHOW Menu371
- Figure 8.22 MAIN Menu and Status Submenu371
- Operation and Target Leds372
- Programmable Leds372
- Figure 8.23 MAIN Menu and Breaker Submenu372
- Figure 8.24 Factory Default Front-Panel Leds372
- Lamp Test373
  - Figure 8.25 Target Reset Pushbutton373
  - Table 8.3 Possible Warning Conditions (Flashing TRIP LED)373
  - Front-Panel Operator Control Pushbuttons374
  - Other Target Reset Options374
- Figure 8.26 Operator Control Pushbuttons and Leds374
- Table 8.4 SEL-751A Front-Panel Operator Control Functions375
- Event Reporting377
Section 9: Analyzing Events377
- Overview377
- Event Reporting378
- Table 9.2 Event Report Current and Voltage Columns383
- Table 9.3 Output, Input, Protection, and Control Element Event Report Columns384
- Example 15-Cycle Event Report385
- Figure 9.3 Example Standard 15-Cycle Event Report 1/4-Cycle Resolution388
- Figure 9.4 Derivation of Event Report Current Values and RMS Current Values from Sampled Current Waveform389
- Figure 9.5 Derivation of Phasor RMS Current Values from Event Report Current Values390
- Sequential Events Recorder (SER) Report391
  - SER Triggering391
  - SER Aliases391
- Figure 9.6 Example Sequential Events Recorder (SER) Event Report391
- Testing Tools393
- Serial Port Commands393
Section 10: Testing and Troubleshooting393
- Overview393
- Commissioning Tests394
- Table 10.1 Serial Port Commands that Clear Relay Data Buffers397
- Current Imbalance Metering Accuracy398
- Table 10.2 Phase Current Measuring Accuracy398
- Table 10.3 Current Unbalance Measuring Accuracy398
- Figure 10.3 Current Source Connections398
- Power and Power Factor Measuring Accuracy399
- Periodic Tests (Routine Maintenance)403
- Table 10.6 Periodic Relay Checks403
- Figure 10.6 CEV R Light Event Capture Example403
- Relay Self-Tests404
- Table 10.8 Troubleshooting406
- Factory Assistance407
Appendix A: Firmware and Manual Versions Firmware410
- Upgrade Instructions419
Appendix B: Firmware Upgrade Instructions419
- Overview419
- Figure B.1 Firmware File Transfer Process420
- SEL Communications Processors423
- SEL Communications Protocols423
  - SEL ASCII Commands423
  - SEL Compressed ASCII Commands423
Appendix C: SEL Communications Processors423
- Table C.1 Supported Serial Command Sets423
Appendix Ddnp3 Communications435
- Overview435
- Introduction to DNP3435
  - Data Handling436
  - Objects436
- Table D.1 DNP3 Implementation Levels436
  - Access Methods437
  - Qualifier Codes and Ranges437
- Table D.2 Selected DNP3 Function Codes437
  - Binary Control Operations438
  - Conformance Testing438
- Table D.3 DNP3 Access Methods438
  - DNP3 Serial Network Issues439
  - DNP3 LAN/WAN Overview439
  - Data Link Layer Operation439
  - Network Medium Contention439
- DNP3 in the SEL-751A440
- Data Access440
- Table D.4 TCP/UDP Selection Guidelines440
- Table D.5 DNP3 Access Methods440
  - Collision Avoidance442
  - Transmission Control442
  - Event Data442
- Figure D.2 Message Transmission Timing442
- Binary Controls443
- Table D.6 SEL-751A Event Buffer Capacity443
  - Time Synchronization444
  - Modem Support444
- Table D.7 Port DNP3 Protocol Settings445
- Table D.8 Serial Port DNP3 Modem Settings446
- Configurable Data Mapping447
- Figure 4.48 Counter448
- Figure D.3 Sample Response to SHO DNP Command448
- Figure D.4 Port MAP Command449
- Table D.9 Sample Custom DNP3 AI Map451
  - Figure D.5 Sample Custom DNP3 AI Map Settings451
  - AI Point Label, Scaling and Deadband in Acselerator Quickset Software452
  - Analog Input Map Entry in Acselerator Quickset Software452
- Figure D.8 Sample Custom DNP3 BO Map Settings453
- Figure D.9 Binary Output Map Entry in AC SEL ERATOR Quickset Software453
- DNP3 Documentation454
- Table D.10 SEL-751A DNP3 Device Profile454
- Table D.11 SEL-751A DNP Object List455
- Table D.12 DNP3 Reference Data Map459
- Table D.13 DNP3 Default Data Map460
  - Binary Inputs461
  - Binary Outputs461
- Table D.14 Example Object 12 Trip/Close or Code Selection Operation461
Appendix E: Modbus RTU Communications463
- Overview463
- Communications Protocol464
  - Modbus Queries464
  - Modbus Responses464
  - Supported Modbus Function Codes464
- Table E.1 Modbus Query Fields464
- Table E.2 SEL-751A Modbus Function Codes464
  - Modbus Exception Responses465
  - Cyclical Redundancy Check465
- Table E.3 SEL-751A Modbus Exception Codes465
- Table E.4 01H Read Discrete Output Coil Status Command465
- Table E.5 Responses to 01H Read Discrete Output Coil Query Errors466
- Table E.6 02H Read Input Status Command466
- Table E.7 02H SEL-751A Inputs467
- 03H Read Holding Register Command470
- Table E.8 Responses to 02H Read Input Query Errors470
- Table E.9 03H Read Holding Register Command471
- Table E.10 Responses to 03H Read Holding Register Query Errors471
- Table E.11 04H Read Input Register Command471
- Table E.12 Responses to 04H Read Input Register Query Errors472
- Table E.13 05H Force Single Coil Command472
- Table E.14 01H, 05H SEL-751A Output472
- 06H Preset Single Register Command475
- Table E.15 Responses to 05H Force Single Coil Query Errors475
- Table E.16 06H Preset Single Register Command476
- Table E.17 Responses to 06H Preset Single Register Query Errors476
- Table E.18 10H Preset Multiple Registers Command476
- Table E.19 10H Preset Multiple Registers Query Error Messages477
- Table E.20 60H Read Parameter Information Command477
- Table E.21 60H Read Parameter Descriptor Field Definition477
- Table E.22 60H Read Parameter Conversion Field Definition478
- Table E.23 Responses to 60H Read Parameter Information Query Errors478
- Table E.24 61H Read Parameter Text Command479
- Table E.25 61H Read Parameter Text Query Error Messages479
- Table E.26 62H Read Enumeration Text Command479
- Table E.27 61H Read Parameter Enumeration Text Query Error Messages480
- Table E.28 7Dh Encapsulated Packet with Control Command480
  - Reading Parameter Information and Value Using Modbus481
  - Modifying Relay Settings Using Modbus481
- Table E.29 7Dh Encapsulated Packet Query Errors481
- Table E.30 7Eh NOP Command481
  - Controlling Output Contacts Using Modbus482
  - User-Defined Modbus Data Region and SET M Command482
- Table E.31 Modbus Register Labels for Use with SET M Command483
- Modbus Register Map488
- Reading History Data Using Modbus488
- Table E.32 Modbus Register Map488
Appendix Fiec 61850 Communications545
- Features545
- Introduction to IEC 61850546
- Table F.1 IEC 61850 Document Set546
- IEC 61850 Operation547
  - Ethernet Networking547
  - Object Models547
  - Data Mapping548
  - Mms548
  - Goose548
- Table F.2 Example IEC 61850 Descriptor Components548
- Table F.3 SEL-751A Logical Devices548
  - File Services549
  - SCL Files549
  - Reports549
- Table F.4 Buffered Report Control Block Client Access550
- Figure F.1 SEL-751A Predefined Reports550
- Table F.5 Unbuffered Report Control Block Client Access551
  - Figure F.2 SEL-751A Datasets551
  - Supplemental Software552
  - Time Stamps and Quality552
  - GOOSE Processing553
- Figure F.3 GOOSE Quality553
- IEC 61850 Configuration554
- Table F.6 IEC 61850 Settings554
  - Acselerator Architect555
  - SEL ICD File Versions555
  - CID File Conversion556
- Table F.7 ICD Logical Nodes Summary556
- Logical Node Extensions560
- Table F.8 Metering and Measurement Logical Nodes560
- Table F.9 Thermal Metering Data560
- Table F.10 MSTA Class561
- Table F.11 MDST Class561
- Logical Nodes562
- Table F.12 Logical Device: PRO (Protection)562
- Table F.13 Logical Device: MET (Metering)565
- Table F.14 Logical Device: con (Control)568
- Table F.15 Logical Device: ANN (Annunciation)568
- Protocol Implementation Conformance Statement569
- Table F.16 PICS for A-Profile Support569
- Table F.17 PICS for T-Profile Support569
- Table F.18 MMS Service Supported Conformance569
- Table F.19 MMS Parameter CBB572
- Table F.20 Alternate Access Selection Conformance Statement572
- Table F.21 Variableaccessspecification Conformance Statement572
- Table F.22 Variablespecification Conformance Statement573
- Table F.23 Read Conformance Statement573
- Table F.24 Getvariableaccessattributes Conformance Statement573
- Table F.25 Definenamedvariablelist Conformance Statement573
- GOOSE Services Conformance Statement574
- Table F.26 Getnamedvariablelistattributes Conformance Statement574
- Table F.27 Deletenamedvariablelist574
- Table F.28 GOOSE Conformance574
- ACSI Conformance Statements575
- Table F.29 ACSI Basic Conformance Statement575
- Table F.30 ACSI Models Conformance Statement575
- Table F.31 ACSI Services Conformance Statement576
- Devicenet Communications581
- Devicenet Card581
Appendix G: Devicenet Communications581
- Figure G.1 Devicenet Card Component Overview581
- Features582
- Electronic Data Sheet583
Appendix H Synchrophasors585
- Overview585
- Synchrophasor Measurement586
- Figure H.1 Phase Reference586
- Figure H.2 Waveform at Relay Terminals May Have a Phase Shift587
- Figure H.3 Correction of Measured Phase Angle587
- Settings for Synchrophasors588
- Table H.1 PMU Settings in the SEL-751A for C37.118 Protocol in Global Settings588
  - Descriptions of Synchrophasor Settings589
  - Mrate589
  - PMSTN and PMID589
- Table H.2 SEL-751A Serial Port Settings for Synchrophasors589
- PHDATAI and ICOMP590
- Table H.3 Synchrophasor Order in Data Stream (Voltages and Currents)590
- Table H.4 User-Defined Analog Values Selected by the NUMANA Setting591
- Table H.5 User-Defined Digital Status Words Selected by the NUMDSW Setting591
- TREA1, TREA2, TREA3, TREA4, and PMTRIG592
- Synchrophasor Relay Word Bits592
- Irigc592
- Table H.6 Synchrophasor Trigger Relay Word Bits592
- View Synchrophasors Using the MET PM Command593
- Table H.7 Time Synchronization Relay Word Bits593
- C37.118 Synchrophasor Protocol594
  - Settings Affect Message Contents594
  - Communications Bandwidth594
- Figure H.4 Sample MET PM Command Response594
- Protocol Operation595
- Table H.8 Size of a C37.118 Synchrophasor Message595
- Table H.9 Serial Port Bandwidth for Synchrophasors (in Bytes)595
  - Transmit Mode Control596
  - Message Transmission597
Appendix I: MIRRORED BITS Communications597
- Overview597
- Operation597
  - Message Reception Overview598
  - Message Decoding and Integrity Checks598
- Table I.1 Number of MIRRORED BITS Messages for Different Baud598
- Settings601
- Table I.4 MIRRORED BITS Communications Message Transmission Period601
- Table I.5 MIRRORED BITS Protocol Settings601
- Table J.1 SEL-751A Relay Word Bits603
Appendix J: Relay Word Bits Overview604
- Table J.2 Relay Word Bit Definitions for the SEL-751A606
Appendix K Analog Quantities617
- Table K.1 Analog Quantities618
Glossary623
Index629
SEL-751A Relay Command Summary633

Type	Feeder Protection Relay
Frequency	50/60 Hz
Operating Temperature	-40 to +85 °C
Mounting	Rack
Communication Ports	Ethernet
Protection Functions	Overcurrent, Overvoltage, Undervoltage, Frequency, Directional Power
Manufacturer	Schweitzer Engineering Laboratories (SEL)

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