Sel SEL-787 User manual

Instruction Manual
20150130
SEL-787 Relay
Transformer Protection Relay
Instruction Manual
*PM787-01-NB*

SEL-787 Relay Instruction Manual Date Code 20150130
© 2006–2015 by Schweitzer Engineering Laboratories, Inc. All rights reserved.
All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. No SEL
trademarks may be used without written permission. SEL products appearing in this document may be covered by U.S. and Foreign patents.
Schweitzer Engineering Laboratories, Inc. reserves all rights and benefits afforded under federal and international copyright and patent laws in
its products, including without limitation software, firmware, and documentation.
The information in this document is provided for informational use only and is subject to change without notice. Schweitzer Engineering
Laboratories, Inc. has approved only the English language document.
This product is covered by the standard SEL 10-year warranty. For warranty details, visit www.selinc.com or contact your customer service
representative. PM787-01

Date Code 20150130 Instruction Manual SEL-787 Relay
Table of Contents
Instruction Manual
List of Tables .......................................................................................................................................................v
List of Figures ....................................................................................................................................................xi
Preface ...............................................................................................................................................................xvii
Manual Overview...........................................................................................................................................xvii
Safety Information.........................................................................................................................................xviii
General Information ........................................................................................................................................xxi
Section 1: Introduction and Specifications
Overview ......................................................................................................................................................... 1.1
Features............................................................................................................................................................1.1
Models, Options, and Accessories...................................................................................................................1.2
Applications..................................................................................................................................................... 1.4
Getting Started................................................................................................................................................. 1.4
Specifications ..................................................................................................................................................1.9
Section 2: Installation
Overview ......................................................................................................................................................... 2.1
Relay Placement..............................................................................................................................................2.1
I/O Configuration ............................................................................................................................................2.2
Rear-Panel Connections ................................................................................................................................2.18
AC/DC Control Connection Diagrams..........................................................................................................2.22
Field Serviceability........................................................................................................................................2.31
Section 3: PC Software
Overview ......................................................................................................................................................... 3.1
Setup................................................................................................................................................................3.2
Terminal...........................................................................................................................................................3.4
Settings Database Management and Drivers................................................................................................... 3.5
Settings............................................................................................................................................................3.6
Event Analysis............................................................................................................................................... 3.10
Meter and Control..........................................................................................................................................3.12
ACSELERATOR QuickSet Help...................................................................................................................... 3.14
Section 4: Protection and Logic Functions
Overview ......................................................................................................................................................... 4.1
Application Data.............................................................................................................................................. 4.2
Group Settings (SET Command).....................................................................................................................4.2
Basic Protection............................................................................................................................................... 4.5
RTD-Based Protection................................................................................................................................... 4.46
Voltage-Based Protection ..............................................................................................................................4.48
Demand Metering..........................................................................................................................................4.62
Trip/Close Logic............................................................................................................................................4.67
Logic Settings (SET L Command)................................................................................................................ 4.70
Global Settings (SET G Command)..............................................................................................................4.81
Port Settings (SET P Command)...................................................................................................................4.94
Front-Panel Settings (SET F Command).......................................................................................................4.97
Report Settings (SET R Command)............................................................................................................4.108
DNP Map Settings (SET DNP n Command, n = 1, 2, or 3)........................................................................................4.110
Modbus Map Settings (SET M Command).................................................................................................4.111

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SEL-787 Relay Instruction Manual Date Code 20150130
Table of Contents
Section 5: Metering and Monitoring
Overview ......................................................................................................................................................... 5.1
Power Measurement Conventions ................................................................................................................... 5.2
Metering ..........................................................................................................................................................5.3
Small Signal Cutoff for Metering..................................................................................................................5.12
Load Profiling................................................................................................................................................ 5.12
Through-Fault Event Monitoring ..................................................................................................................5.13
Section 6: Settings
Overview ......................................................................................................................................................... 6.1
View/Change Settings With Front Panel.........................................................................................................6.2
View/Change Settings Over Communications Port......................................................................................... 6.4
Setting Entry Error Messages.......................................................................................................................... 6.6
SEL-787 Settings Sheets
Section 7: Communications
Overview ......................................................................................................................................................... 7.1
Communications Interfaces............................................................................................................................. 7.1
Communications Protocols............................................................................................................................ 7.10
SEL ASCII Protocol and Commands............................................................................................................7.14
Section 8: Front-Panel Operations
Overview ......................................................................................................................................................... 8.1
Front-Panel Layout.......................................................................................................................................... 8.1
Human-Machine Interface............................................................................................................................... 8.2
Operation and Target LEDs........................................................................................................................... 8.12
Section 9: Analyzing Events
Overview ......................................................................................................................................................... 9.1
Event Reporting...............................................................................................................................................9.2
Sequential Events Recorder (SER) Report....................................................................................................9.22
Section 10: Testing and Troubleshooting
Overview ....................................................................................................................................................... 10.1
Testing Tools.................................................................................................................................................. 10.1
Commissioning Tests.....................................................................................................................................10.3
Periodic Tests (Routine Maintenance)......................................................................................................... 10.10
Self-Test....................................................................................................................................................... 10.11
Troubleshooting...........................................................................................................................................10.15
Factory Assistance.......................................................................................................................................10.15
Appendix A: Firmware and Manual Versions
Firmware......................................................................................................................................................... A.1
ICD File.......................................................................................................................................................... A.7
Instruction Manual........................................................................................................................................ A.10
Appendix B: Firmware Upgrade Instructions
Overview .........................................................................................................................................................B.1
Upgrade Firmware Using ACSELERATOR QuickSet.......................................................................................B.2
Upgrade Firmware Using a Terminal Emulator..............................................................................................B.6
Relays With IEC 61850 Option.......................................................................................................................B.8
Factory Assistance...........................................................................................................................................B.9

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Date Code 20150130 Instruction Manual SEL-787 Relay
Table of Contents
Appendix C: SEL Communications Processors
SEL Communications Protocols......................................................................................................................C.1
SEL Communications Processor.....................................................................................................................C.3
SEL Communications Processor and Relay Architecture...............................................................................C.5
Appendix D: DNP3 Communications
Overview ........................................................................................................................................................ D.1
Introduction to DNP3 ..................................................................................................................................... D.1
DNP3 in the SEL-787..................................................................................................................................... D.6
DNP3 Documentation .................................................................................................................................. D.13
Appendix E: Modbus RTU Communications
Overview .........................................................................................................................................................E.1
Communications Protocol...............................................................................................................................E.2
Modbus Register Map ...................................................................................................................................E.23
Appendix F: IEC 61850 Communications
Features............................................................................................................................................................ F.1
Introduction to IEC 61850............................................................................................................................... F.2
IEC 61850 Operation....................................................................................................................................... F.3
IEC 61850 Configuration.............................................................................................................................. F.11
Logical Node Extensions............................................................................................................................... F.13
Logical Nodes................................................................................................................................................ F.15
Protocol Implementation Conformance Statement ....................................................................................... F.29
ACSI Conformance Statements..................................................................................................................... F.35
Appendix G: DeviceNet Communications
Overview ........................................................................................................................................................ G.1
DeviceNet Card .............................................................................................................................................. G.2
Features........................................................................................................................................................... G.2
Electronic Data Sheet..................................................................................................................................... G.3
Appendix H: Synchrophasors
Introduction .................................................................................................................................................... H.1
Synchrophasor Measurement ......................................................................................................................... H.2
Settings for Synchrophasors........................................................................................................................... H.4
Synchrophasor Relay Word Bits..................................................................................................................... H.9
View Synchrophasors Using the MET PM Command................................................................................. H.10
C37.118 Synchrophasor Protocol................................................................................................................. H.11
Appendix I: MIRRORED BITS Communications
Overview ..........................................................................................................................................................I.1
Operation..........................................................................................................................................................I.1
Settings.............................................................................................................................................................I.5
Appendix J: Relay Word Bits
Overview ..........................................................................................................................................................J.1
Definitions ........................................................................................................................................................J.4
Appendix K: Analog Quantities
Glossary
Index
SEL-787 Relay Command Summary

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Date Code 20150130 Instruction Manual SEL-787 Relay
List of Tables
Instruction Manual Table 1.1 SEL-787 Serial Port Settings.................................................................................................. 1.6
Table 2.1 Power Supply Card Inputs Terminal Designation.................................................................. 2.4
Table 2.2 Communication Ports.............................................................................................................2.4
Table 2.3 Communication Card Interfaces and Connectors................................................................... 2.5
Table 2.4 6 ACI Current Card Inputs Terminal Designation .................................................................2.6
Table 2.5 1 ACI/3 AVI or 1 ACI Current/Voltage Card Inputs Terminal Designation ..........................2.7
Table 2.6 Four Analog Input/Four Analog Output (4 AI/4 AO) Card Terminal Allocation.................. 2.7
Table 2.7 I/O (3 DI/4 DO/1 AO) Card Terminal Allocation.................................................................. 2.8
Table 2.8 RTD (10 RTD) Card Terminal Allocation.............................................................................. 2.8
Table 2.9 Four Digital Input/Four Digital Output (4 DI/4 DO) Card Terminal Allocation ................... 2.9
Table 2.10 Eight Digital Input (8 DI) Card Terminal Allocation.............................................................2.9
Table 2.11 Four Digital Inputs, One Form-B Digital Output, Two Form-C Digital Outputs
(4 DI/3DO) Card Terminal Allocation .............................................................................2.10
Table 2.12 Jumper Functions and Default Positions.............................................................................. 2.16
Table 2.13 Typical Maximum RTD Lead Length.................................................................................. 2.21
Table 3.1 SEL Software Solutions......................................................................................................... 3.1
Table 3.2 ACSELERATOR QuickSet SEL-5030 Software....................................................................... 3.1
Table 3.3 File/Tools Menus.................................................................................................................... 3.7
Table 3.4 ACSELERATOR QuickSet Help............................................................................................. 3.14
Table 4.1 Identifier Settings...................................................................................................................4.2
Table 4.2 Configurations and Ratings (Phase CTs, Power Transformer) .............................................. 4.3
Table 4.3 Configurations and Ratings (Optional Neutral CT, Phase PT) ..............................................4.4
Table 4.4 Differential Element Settings...............................................................................................4.10
Table 4.5 Preferred Compensation Settings (W1CTC and W2CTC) .................................................. 4.22
Table 4.6 Restricted Earth Fault Settings.............................................................................................4.33
Table 4.7 Winding n Maximum Phase Overcurrent Settings (n = 1 or 2)............................................ 4.34
Table 4.8 Winding n Residual Overcurrent Settings (n = 1, 2)............................................................4.37
Table 4.9 Winding n Negative-Sequence Overcurrent Settings (n = 1 or 2)........................................4.37
Table 4.10 Winding n Maximum Phase Time-Overcurrent (n = 1 or 2)................................................4.38
Table 4.11 Winding n Phase A, B, and C Time-Overcurrent (n = 1 or 2)....................................................4.39
Table 4.12 Residual Time-Overcurrent Settings (n = 1 or 2)................................................................. 4.40
Table 4.13 Winding n Negative-Sequence Time-Overcurrent Settings (n = 1, 2) ...................................... 4.41
Table 4.14 Neutral Overcurrent Settings................................................................................................ 4.41
Table 4.15 Neutral Time-Overcurrent Settings......................................................................................4.42
Table 4.16 Equations Associated With U.S. Curves..............................................................................4.43
Table 4.17 Equations Associated With IEC Curves............................................................................... 4.43
Table 4.18 RTD Settings........................................................................................................................4.46
Table 4.19 RTD Resistance Versus Temperature ...................................................................................4.47
Table 4.20 Undervoltage Settings .......................................................................................................... 4.48
Table 4.21 Overvoltage Settings ............................................................................................................ 4.49
Table 4.22 Volts Per Hertz Settings........................................................................................................ 4.53
Table 4.23 Power Element Settings........................................................................................................4.58
Table 4.24 Frequency Settings............................................................................................................... 4.60
Table 4.25 Demand Meter Settings........................................................................................................ 4.62
Table 4.26 Trip/Close Logic Settings.....................................................................................................4.67
Table 4.27 Enable Settings.....................................................................................................................4.70
Table 4.28 Latch Bits Equation Settings................................................................................................4.72
Table 4.29 SELOGIC Control Equation Operators (Listed in Operator Precedence) ............................. 4.74
Table 4.30 Other SELOGIC Control Equation Operators/Values............................................................4.77
Table 4.31 SELOGIC Variable Settings...................................................................................................4.77
Table 4.32 Counter Input/Output Description........................................................................................ 4.78
Table 4.33 Order of Precedence of the Control Inputs........................................................................... 4.79

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SEL-787 Relay Instruction Manual Date Code 20150130
Table 4.34 Control Output Equations and Contact Behavior Settings................................................... 4.80
Table 4.35 General Global Settings .......................................................................................................4.81
Table 4.36 Setting Group Selection ....................................................................................................... 4.83
Table 4.37 Time and Date Management Settings .................................................................................. 4.83
Table 4.38 Breaker Failure Setting.........................................................................................................4.85
Table 4.39 Summary of Steps ................................................................................................................ 4.87
Table 4.40 Analog Input Card in Slot 3 .................................................................................................4.89
Table 4.41 Output Setting for a Card in Slot 3....................................................................................... 4.90
Table 4.42 Slot C Input Debounce Settings........................................................................................... 4.93
Table 4.43 Setting Change Disable Setting............................................................................................ 4.93
Table 4.44 Time-Synchronization Source Setting.................................................................................. 4.94
Table 4.45 Front-Panel Serial Port Settings........................................................................................... 4.94
Table 4.46 Ethernet Port Settings...........................................................................................................4.95
Table 4.47 Fiber-Optic Serial Port Settings ...........................................................................................4.95
Table 4.48 Rear-Panel Serial Port Settings ............................................................................................4.96
Table 4.49 Rear-Panel Serial Port (EIA-232/EIA-485) Settings............................................................ 4.96
Table 4.50 Rear-Panel DeviceNet Port Settings.....................................................................................4.97
Table 4.51 Display Point and Local Bit Default Settings ......................................................................4.98
Table 4.52 Front-Panel General Settings ............................................................................................... 4.98
Table 4.53 LCD Display Point Settings................................................................................................. 4.98
Table 4.54 Settings That Always, Never, or Conditionally Hide a Display Point ................................. 4.99
Table 4.55 Entries for the Four Strings................................................................................................4.100
Table 4.56 Binary Entry in the Name String Only...............................................................................4.102
Table 4.57 Analog Entry in the Name String Only..............................................................................4.102
Table 4.58 Entry in the Name String and the Alias Strings.................................................................4.103
Table 4.59 Example Settings and Displays..........................................................................................4.104
Table 4.60 Target LED Settings........................................................................................................... 4.107
Table 4.61 Pushbutton LED Settings ...................................................................................................4.107
Table 4.62 Auto-Removal Settings ......................................................................................................4.108
Table 4.63 SER Trigger Settings..........................................................................................................4.109
Table 4.64 Enable Alias Settings .........................................................................................................4.109
Table 4.65 SET R SER Alias Settings .................................................................................................4.109
Table 4.66 Event Report Settings......................................................................................................... 4.110
Table 4.67 Load Profile Settings..........................................................................................................4.110
Table 4.68 DNP Map Settings..............................................................................................................4.110
Table 4.69 User Map Register Settings ...............................................................................................4.111
Table 5.1 Measured Fundamental Meter Values....................................................................................5.3
Table 5.2 Measured Differential Meter Values ......................................................................................5.4
Table 5.3 Thermal Meter Values............................................................................................................ 5.5
Table 5.4 RTD Input Status Messages ................................................................................................... 5.5
Table 5.5 Maximum/Minimum Meter Values........................................................................................5.6
Table 5.6 RMS Meter Values ................................................................................................................. 5.8
Table 5.7 Demand Values..................................................................................................................... 5.10
Table 5.8 Measured Harmonic Meter Values....................................................................................... 5.10
Table 5.9 Synchrophasor Measured Values ......................................................................................... 5.11
Table 5.10 Through-Fault Element Settings .......................................................................................... 5.14
Table 5.11 Through-Fault Events Report Messages .............................................................................. 5.17
Table 6.1 Methods of Accessing Settings..............................................................................................6.1
Table 6.2 SHOW Command Options..................................................................................................... 6.4
Table 6.3 SET Command Options ......................................................................................................... 6.4
Table 6.4 SET Command Editing Keystrokes........................................................................................ 6.5
Table 6.5 SET Command Format...........................................................................................................6.5
Table 6.6 Setting Interdependency Error Messages...............................................................................6.6
Table SET.1 Port Number Settings That Must be Unique...................................................................SET.39
Table 7.1 SEL-787 Communications Port Interfaces............................................................................. 7.1
Table 7.2 EIA-232/EIA-485 Serial Port Pin Functions......................................................................... 7.7

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Date Code 20150130 Instruction Manual SEL-787 Relay
Table 7.3 Protocols Supported on the Various Ports............................................................................7.10
Table 7.4 Settings Associated With SNTP...........................................................................................7.13
Table 7.5 Serial Port Automatic Messages ..........................................................................................7.15
Table 7.6 Command Response Header Definitions ............................................................................. 7.17
Table 7.7 Access Commands ............................................................................................................... 7.18
Table 7.8 ANALOG Command ........................................................................................................... 7.19
Table 7.9 ANALOG Command Format............................................................................................... 7.20
Table 7.10 COM Command...................................................................................................................7.22
Table 7.11 CONTROL Command ......................................................................................................... 7.22
Table 7.12 Three Remote Bit States....................................................................................................... 7.23
Table 7.13 COPY Command.................................................................................................................. 7.23
Table 7.14 COUNTER Command ......................................................................................................... 7.23
Table 7.15 Date Command.....................................................................................................................7.23
Table 7.16 EVENT Command (Event Reports)..................................................................................... 7.24
Table 7.17 EVENT Command Format...................................................................................................7.25
Table 7.18 FILE Command....................................................................................................................7.25
Table 7.19 GOOSE Command Variants.................................................................................................7.25
Table 7.20 GROUP Command...............................................................................................................7.27
Table 7.21 HELP Command .................................................................................................................. 7.28
Table 7.22 HISTORY Command ........................................................................................................... 7.28
Table 7.23 IDENTIFICATION Command.............................................................................................7.28
Table 7.24 IRI Command.......................................................................................................................7.29
Table 7.25 LDP Commands...................................................................................................................7.29
Table 7.26 LDP Command Parameters..................................................................................................7.30
Table 7.27 L_D Command (Load Firmware) ........................................................................................7.30
Table 7.28 LOO Command....................................................................................................................7.30
Table 7.29 Meter Command...................................................................................................................7.31
Table 7.30 Meter Command Parameters................................................................................................ 7.31
Table 7.31 Meter Class...........................................................................................................................7.32
Table 7.32 PASSWORD Command.......................................................................................................7.33
Table 7.33 PAS Command Format.........................................................................................................7.33
Table 7.34 Factory-Default Passwords for Access Levels 1, 2, and C...................................................7.33
Table 7.35 Valid Password Characters................................................................................................... 7.33
Table 7.36 PUL OUTnnn Command ..................................................................................................... 7.34
Table 7.37 QUIT Command................................................................................................................... 7.35
Table 7.38 R_S Command (Restore Factory Defaults).......................................................................... 7.35
Table 7.39 SER Command (Sequential Events Recorder Report)......................................................... 7.35
Table 7.40 SER Command Format ........................................................................................................ 7.35
Table 7.41 SER D Command.................................................................................................................7.36
Table 7.42 SET Command (Change Settings) ....................................................................................... 7.36
Table 7.43 SET Command Format.........................................................................................................7.36
Table 7.44 SET Command Editing Keystrokes...................................................................................... 7.37
Table 7.45 SHOW Command (Show/View Settings)............................................................................. 7.37
Table 7.46 SHOW Command Format....................................................................................................7.37
Table 7.47 STATUS Command (Relay Self-Test Status)....................................................................... 7.40
Table 7.48 STATUS Command Report and Definitions ........................................................................ 7.40
Table 7.49 SUMMARY Command........................................................................................................7.41
Table 7.50 TARGET Command (Display Relay Word Bit Status)........................................................ 7.42
Table 7.51 TARGET Command Format ................................................................................................7.42
Table 7.52 Front-Panel LEDs and the TAR 0 Command.......................................................................7.42
Table 7.53 TIME Command (View/Change Time)................................................................................7.43
Table 7.54 TRIGGER Command (Trigger Event Report)..................................................................... 7.43
Table 7.55 VEC Command .................................................................................................................... 7.44
Table 8.1 Front-Panel Automatic Messages (FP_AUTO := OVERRIDE) ............................................ 8.3
Table 8.2 Front-Panel Pushbutton Functions ......................................................................................... 8.5
Table 8.3 Possible Warning Conditions (Flashing TRIP LED) ...........................................................8.13

viii List of Tables
SEL-787 Relay Instruction Manual Date Code 20150130
Table 8.4 SEL-787 Front-Panel Operator Control Functions .............................................................. 8.15
Table 9.1 Event Types............................................................................................................................9.4
Table 9.2 Analog Event Report Columns Definitions............................................................................9.8
Table 9.3 Digital Event Report Column Definitions............................................................................ 9.15
Table 9.4 Differential Event Report Column Definitions for Analog Quantities........................................ 9.20
Table 9.5 Differential Event Report Digital Column Definitions for Protection, Control, and
I/O Elements..................................................................................................................... 9.20
Table 10.1 Resultant Scale Factors for Inputs........................................................................................10.2
Table 10.2 Serial Port Commands That Clear Relay Data Buffers........................................................10.6
Table 10.3 CTR1 Phase Current Measuring Accuracy .......................................................................... 10.7
Table 10.4 CTR2 Phase Current Measuring Accuracy .......................................................................... 10.8
Table 10.5 Power Quantity Accuracy—Wye Voltages...........................................................................10.9
Table 10.6 Power Quantity Accuracy—Delta Voltages....................................................................... 10.10
Table 10.7 Periodic Relay Checks .......................................................................................................10.10
Table 10.8 Relay Self-Tests.................................................................................................................. 10.11
Table 10.9 Troubleshooting..................................................................................................................10.15
Table A.1 200 Series Firmware Revision History ................................................................................. A.1
Table A.2 100 Series Firmware Revision History ................................................................................. A.5
Table A.3 DeviceNet Card Versions ...................................................................................................... A.7
Table A.4 EDS File Compatibility......................................................................................................... A.7
Table A.5 SEL-787 ICD File Revision History ..................................................................................... A.8
Table A.6 Instruction Manual Revision History.................................................................................. A.10
Table C.1 Supported Serial Command Sets............................................................................................C.1
Table C.2 Compressed ASCII Commands .............................................................................................C.2
Table C.3 SEL Communications Processors Protocol Interfaces...........................................................C.4
Table C.4 SEL Communications Processor Port 1 Settings ...................................................................C.7
Table C.5 SEL Communications Processor Data Collection Automessages..........................................C.7
Table C.6 SEL Communications Processor Port 1 Automatic Messaging Settings...............................C.8
Table C.7 SEL Communications Processor Port 1 Region Map ............................................................C.8
Table C.8 Communications Processor METER Region Map.................................................................C.9
Table C.9 Communications Processor TARGET Region Map.............................................................C.10
Table C.10 Communications Processor DEMAND Region Map...........................................................C.11
Table D.1 DNP3 Implementation Levels............................................................................................... D.1
Table D.2 Selected DNP3 Function Codes............................................................................................D.2
Table D.3 DNP3 Access Methods.......................................................................................................... D.4
Table D.4 TCP/UDP Selection Guidelines............................................................................................D.6
Table D.5 DNP3 Access Methods.......................................................................................................... D.6
Table D.6 SEL-787 Event Buffer Capacity............................................................................................ D.9
Table D.7 Port DNP3 Protocol Settings............................................................................................... D.11
Table D.8 Serial Port DNP3 Modem Settings...................................................................................... D.12
Table D.9 SEL-787 DNP Object List................................................................................................... D.13
Table D.10 DNP3 Reference Data Map................................................................................................. D.18
Table D.11 DNP3 Default Data Map..................................................................................................... D.19
Table D.12 SEL-787 Object 12 Control Operations.............................................................................. D.22
Table D.13 Sample Custom DNP3 AI Map........................................................................................... D.26
Table E.1 Modbus Query Fields.............................................................................................................E.2
Table E.2 SEL-787 Modbus Function Codes.........................................................................................E.2
Table E.3 SEL-787 Modbus Exception Codes.......................................................................................E.3
Table E.4 01h Read Discrete Output Coil Status Command..................................................................E.3
Table E.5 Responses to 01h Read Discrete Output Coil Query Errors ..................................................E.4
Table E.6 02h Read Input Status Command...........................................................................................E.4
Table E.7 02h SEL-787 Inputs ...............................................................................................................E.5
Table E.8 Responses to 02h Read Input Query Errors ...........................................................................E.8
Table E.9 03h Read Holding Register Command...................................................................................E.8
Table E.10 Responses to 03h Read Holding Register Query Errors ........................................................E.8
Table E.11 04h Read Input Register Command.......................................................................................E.9

ixList of Tables
Date Code 20150130 Instruction Manual SEL-787 Relay
Table E.12 Responses to 04h Read Input Register Query Errors.............................................................E.9
Table E.13 05h Force Single Coil Command...........................................................................................E.9
Table E.14 01h, 05h SEL-787 Output ......................................................................................................E.9
Table E.15 Responses to 05h Force Single Coil Query Errors...............................................................E.12
Table E.16 06h Preset Single Register Command..................................................................................E.12
Table E.17 Responses to 06h Preset Single Register Query Errors........................................................E.12
Table E.18 08h Loopback Diagnostic Command...................................................................................E.13
Table E.19 Responses to 08h Loopback Diagnostic Query Errors.........................................................E.13
Table E.20 10h Preset Multiple Registers Command.............................................................................E.13
Table E.21 10h Preset Multiple Registers Query Error Messages .........................................................E.14
Table E.22 60h Read Parameter Information Command........................................................................E.14
Table E.23 60h Read Parameter Descriptor Field Definition.................................................................E.15
Table E.24 60h Read Parameter Conversion Field Definition................................................................E.15
Table E.25 Responses to 60h Read Parameter Information Query Errors .............................................E.15
Table E.26 61h Read Parameter Text Command....................................................................................E.16
Table E.27 61h Read Parameter Text Query Error Messages.................................................................E.16
Table E.28 62h Read Enumeration Text Command ...............................................................................E.16
Table E.29 61h Read Parameter Enumeration Text Query Error Messages...........................................E.17
Table E.30 7Dh Encapsulated Packet With Control Command .............................................................E.17
Table E.31 7Dh Encapsulated Packet Query Errors...............................................................................E.17
Table E.32 7Eh NOP Command.............................................................................................................E.18
Table E.33 Modbus Register Labels for Use With SET M Command...................................................E.20
Table E.34 Modbus Register Map..........................................................................................................E.23
Table F.1 IEC 61850 Document Set....................................................................................................... F.2
Table F.2 Example IEC 61850 Descriptor Components........................................................................ F.4
Table F.3 SEL-787 Logical Devices ...................................................................................................... F.4
Table F.4 Buffered Report Control Block Client Access....................................................................... F.6
Table F.5 Unbuffered Report Control Block Client Access................................................................... F.7
Table F.6 IEC 61850 Settings............................................................................................................... F.11
Table F.7 New Logical Node Extensions.............................................................................................F.13
Table F.8 Thermal Metering Data Logical Node Class Definition ...................................................... F.13
Table F.9 Demand Metering Statistics Logical Node Class Definition ............................................... F.13
Table F.10 Compatible Logical Nodes With Extensions ....................................................................... F.14
Table F.11 Metering Statistics Logical Node Class Definition.............................................................. F.14
Table F.12 Logical Device: PRO (Protection)........................................................................................ F.15
Table F.13 Logical Device: MET (Metering).........................................................................................F.21
Table F.14 Logical Device: CON (Remote Control).............................................................................. F.25
Table F.15 Logical Device: ANN (Annunciation)................................................................................. F.26
Table F.16 Logical Device: CFG (Configuration) ................................................................................. F.28
Table F.17 PICS for A-Profile Support.................................................................................................. F.29
Table F.18 PICS for T-Profile Support................................................................................................... F.29
Table F.19 MMS Service Supported Conformance ............................................................................... F.29
Table F.20 MMS Parameter CBB .......................................................................................................... F.32
Table F.21 Alternate Access Selection Conformance Statement........................................................... F.32
Table F.22 VariableAccessSpecification Conformance Statement ........................................................ F.32
Table F.23 VariableSpecification Conformance Statement.................................................................... F.33
Table F.24 Read Conformance Statement.............................................................................................. F.33
Table F.25 GetVariableAccessAttributes Conformance Statement........................................................ F.33
Table F.26 DefineNamedVariableList Conformance Statement ............................................................ F.33
Table F.27 GetNamedVariableListAttributes Conformance Statement ................................................. F.34
Table F.28 DeleteNamedVariableList .................................................................................................... F.34
Table F.29 GOOSE Conformance.......................................................................................................... F.34
Table F.30 ACSI Basic Conformance Statement ................................................................................... F.35
Table F.31 ACSI Models Conformance Statement................................................................................ F.35
Table F.32 ACSI Services Conformance Statement............................................................................... F.37
Table H.1 PMU Settings in the SEL-787 for C37.118 Protocol in Global Settings.............................. H.4

xList of Tables
SEL-787 Relay Instruction Manual Date Code 20150130
Table H.2 SEL-787 Serial Port Settings for Synchrophasors ................................................................ H.5
Table H.3 Synchrophasor Order in Data Stream (Voltages and Currents)............................................. H.7
Table H.4 User-Defined Analog Values Selected by the NUMANA Setting........................................ H.7
Table H.5 User-Defined Digital Status Words Selected by the NUMDSW Setting.............................. H.8
Table H.6 PM Trigger Reason Bits—IEEE C37.118 Assignments....................................................... H.8
Table H.7 Synchrophasor Trigger Relay Word Bits ............................................................................ H.10
Table H.8 Time Synchronization Relay Word Bits.............................................................................. H.10
Table H.9 Size of a C37.118 Synchrophasor Message ........................................................................ H.12
Table H.10 Serial Port Bandwidth for Synchrophasors (in Bytes)........................................................ H.12
Table I.1 Number of MIRRORED BITS Messages for Different Baud.....................................................I.2
Table I.2 Positions of the MIRRORED BITS.............................................................................................I.3
Table I.3 MIRRORED BITS Values for a RXDFLT Setting of 10100111.................................................I.3
Table I.4 MIRRORED BITS Communications Message Transmission Period..........................................I.5
Table I.5 MIRRORED BITS Protocol Settings ..........................................................................................I.5
Table J.1 SEL-787 Relay Word Bits.......................................................................................................J.1
Table J.2 Relay Word Bit Definitions for the SEL-787..........................................................................J.4
Table K.1 Analog Quantities.................................................................................................................. K.1

Date Code 20150130 Instruction Manual SEL-787 Relay
List of Figures
Instruction Manual Figure 1.1 Response Header........................................................................................................................1.5
Figure 1.2 STA Command Response—No DeviceNet Communications Card or EIA-232/EIA-485
Communications Card...........................................................................................................1.6
Figure 1.3 STA Command Response—With DeviceNet Communications Card .......................................1.7
Figure 2.1 Relay Panel-Mount Dimensions................................................................................................ 2.2
Figure 2.2 Slot Allocations for Different Cards.......................................................................................... 2.3
Figure 2.3 Circuit Board of Analog I/O Board, Showing Jumper Selection.............................................2.13
Figure 2.4 JMP1 Through JMP4 Locations on 4 AI/4 AO Board.............................................................2.14
Figure 2.5 Current Output Jumpers...........................................................................................................2.15
Figure 2.6 Voltage Output Jumpers........................................................................................................... 2.15
Figure 2.7 Pins for Password Jumper, Breaker Control Jumper, and SELBOOT Jumper..........................2.15
Figure 2.8 Rear-Panel Connections of Selected Cards..............................................................................2.17
Figure 2.9 Dual-Fiber, Ethernet, EIA-232 Communication, 3 DI/4 DO/1 AO, and Current/Voltage
(1 ACI/3 AVI) Option ......................................................................................................... 2.18
Figure 2.10 Single Copper Ethernet, 8 DI, RTD, and 4 AI/4 AO Option ..................................................2.18
Figure 2.11 DeviceNet, Fast Hybrid 4 DI/4 DO, and Current/Voltage Option.......................................... 2.19
Figure 2.12 Control I/O Connections—4 AI/4 AO Option in Slot D and Fiber-Optic Port in Slot B........ 2.20
Figure 2.13 Control I/O Connections—Internal RTD Option ....................................................................2.21
Figure 2.14 Analog Output Wiring Example..............................................................................................2.21
Figure 2.15 Output OUT103 Relay Output Contact Configuration............................................................ 2.22
Figure 2.16 OUT103 Contact Fail-Safe and Nonfail-Safe Options............................................................2.22
Figure 2.17 Single-Phase Voltage Connections ..........................................................................................2.23
Figure 2.18 Voltage Connections ................................................................................................................ 2.24
Figure 2.19 Typical Current Connections................................................................................................... 2.25
Figure 2.20 SEL-787 Provides Basic Two-Winding Transformer Differential Protection......................... 2.26
Figure 2.21 SEL-787 Provides Two-Winding Transformer Differential Protection
With REF (Restricted Earth Fault) Protection .................................................................... 2.27
Figure 2.22 SEL-787 Provides Two-Winding Transformer Differential Protection
With REF and Voltage-Based Protection............................................................................2.28
Figure 2.23 SEL-787 Provides Autotransformer Differential Protection, Including REF Protection........ 2.29
Figure 2.24 Example DC Connections.......................................................................................................2.30
Figure 3.1 Serial Port Communication Dialog Box.................................................................................... 3.2
Figure 3.2 Serial Port Communication Parameters Dialog Box ................................................................. 3.3
Figure 3.3 Network Communication Parameters Dialog Box ....................................................................3.3
Figure 3.4 Tools Menu ................................................................................................................................ 3.4
Figure 3.5 Device Response to the ID Command....................................................................................... 3.4
Figure 3.6 Selection of Drivers ...................................................................................................................3.7
Figure 3.7 Update Part Number .................................................................................................................. 3.7
Figure 3.8 New Setting Screen....................................................................................................................3.8
Figure 3.9 Expressions Created With Expression Builder.......................................................................... 3.9
Figure 3.10 Composite Screens for Retrieving Events ...............................................................................3.10
Figure 3.11 Saving the Retrieved Event......................................................................................................3.11
Figure 3.12 Device Overview Screen.......................................................................................................... 3.12
Figure 3.13 Control Screen .........................................................................................................................3.13
Figure 3.14 Remote Operation Selection....................................................................................................3.14
Figure 4.1 Percentage Restraint Differential Characteristic........................................................................ 4.6
Figure 4.2 Winding 1 Compensated Currents............................................................................................. 4.7
Figure 4.3 Differential Element (87-1) Quantities......................................................................................4.8
Figure 4.4 Differential Element Decision Logic......................................................................................... 4.9
Figure 4.5 Differential Element Harmonic Blocking Logic .....................................................................4.10

xii List of Figures
SEL-787 Relay Instruction Manual Date Code 20150130
Figure 4.6 Differential Current Alarm Logic Diagram.............................................................................4.11
Figure 4.7 Winding Connections, Phase Shifts, and Compensation Direction.........................................4.17
Figure 4.8 Example 1 for WnCTC Selection............................................................................................ 4.19
Figure 4.9 Example 2 for WnCTC Selection............................................................................................ 4.21
Figure 4.10 SEL-787 Differential Characteristics (Preferred and Other)................................................... 4.23
Figure 4.11 REF Directional Element.........................................................................................................4.30
Figure 4.12 REF1 Enable Logic.................................................................................................................. 4.31
Figure 4.13 REF1 Directional Element ......................................................................................................4.31
Figure 4.14 REF Element Trip Output........................................................................................................ 4.32
Figure 4.15 Internal Fault With LV Breaker Open...................................................................................... 4.32
Figure 4.16 REF Protection Output (Extremely Inverse-Time O/C) ..........................................................4.33
Figure 4.17 Single-Wye Winding REF Application (REF1POL := 2)........................................................4.34
Figure 4.18 Autotransformer REF Application (REF1POL := 12)............................................................. 4.34
Figure 4.19 Instantaneous Overcurrent Element Logic...............................................................................4.36
Figure 4.20 Maximum Phase Time-Overcurrent Elements 51P1T and 51P2T........................................... 4.38
Figure 4.21 Phase A, B, and C Time-Overcurrent Elements ......................................................................4.39
Figure 4.22 Residual Time-Overcurrent Elements 51G1T and 51G2T ......................................................4.40
Figure 4.23 Negative-Sequence Time-Overcurrent Element 51Q1T and 51Q2T....................................... 4.41
Figure 4.24 Neutral Time-Overcurrent Elements 51N1T and 51N2T ........................................................4.42
Figure 4.25 U.S. Moderately Inverse Curve: U1......................................................................................... 4.44
Figure 4.26 U.S. Inverse Curve: U2............................................................................................................4.44
Figure 4.27 U.S. Very Inverse Curve: U3 ................................................................................................... 4.44
Figure 4.28 U.S. Extremely Inverse Curve: U4 .......................................................................................... 4.44
Figure 4.29 U.S. Short-Time Inverse Curve: U5......................................................................................... 4.45
Figure 4.30 IEC Class A Curve (Standard Inverse): C1 .............................................................................4.45
Figure 4.31 IEC Class B Curve (Very Inverse): C2 .................................................................................... 4.45
Figure 4.32 IEC Class C Curve (Extremely Inverse): C3.............................................................................. 4.45
Figure 4.33 IEC Long-Time Inverse Curve: C4..........................................................................................4.46
Figure 4.34 IEC Short-Time Inverse Curve: C5.......................................................................................... 4.46
Figure 4.35 Undervoltage Element Logic...................................................................................................4.49
Figure 4.36 Overvoltage Element Logic.....................................................................................................4.50
Figure 4.37 V/Hz Element Logic................................................................................................................ 4.51
Figure 4.38 Dual-Level Volts/Hertz Time-Delay Characteristic, 24CCS = DD.........................................4.52
Figure 4.39 Composite Inverse/Definite-Time Overexcitation Characteristic, 24CCS = ID...................... 4.52
Figure 4.40 Volts/Hertz Inverse-Time Characteristic, 24IC = 0.5 .............................................................. 4.55
Figure 4.41 Volts/Hertz Inverse-Time Characteristic, 24IC = 1 ................................................................. 4.56
Figure 4.42 Volts/Hertz Inverse-Time Characteristic, 24IC = 2 ................................................................. 4.57
Figure 4.43 Three-Phase Power Elements Logic........................................................................................ 4.58
Figure 4.44 Power Elements Operation in the Real/Reactive Power Plane................................................ 4.59
Figure 4.45 Over- and Underfrequency Element Logic..............................................................................4.60
Figure 4.46 Loss-of-Potential (LOP) Logic................................................................................................4.62
Figure 4.47 Demand Current Logic Outputs...............................................................................................4.63
Figure 4.48 Response of Thermal and Rolling Demand Meters to a Step Input
(Setting DMTC = 15 minutes)............................................................................................ 4.64
Figure 4.49 Voltage VSApplied to Series RC Circuit ................................................................................ 4.65
Figure 4.50 Trip Logic................................................................................................................................ 4.68
Figure 4.51 Close Logic.............................................................................................................................. 4.69
Figure 4.52 Schematic Diagram of a Traditional Latching Device.............................................................4.71
Figure 4.53 Logic Diagram of a Latch Switch............................................................................................ 4.71
Figure 4.54 SELOGIC Control Equation Variable/Timers SV01/SV01T–SV32T....................................... 4.73
Figure 4.55 Result of Falling-Edge Operator on a Deasserting Input.........................................................4.76
Figure 4.56 Example Use of SELOGIC Variables/Timers............................................................................4.77
Figure 4.57 Counter 01................................................................................................................................4.78

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Date Code 20150130 Instruction Manual SEL-787 Relay
Figure 4.58 Example of the Effects of the Input Precedence...................................................................... 4.79
Figure 4.59 Phase Rotation Setting............................................................................................................. 4.82
Figure 4.60 Breaker Failure Logic..............................................................................................................4.86
Figure 4.61 Analog Input Card Adaptive Name ......................................................................................... 4.86
Figure 4.62 Settings to Configure Input 1 as a 4–20 mA Transducer Measuring Temperatures
Between –50°C and 150°C ................................................................................................. 4.89
Figure 4.63 Analog Output Number Allocation..........................................................................................4.90
Figure 4.64 Analog Output Settings............................................................................................................4.91
Figure 4.65 DC Mode Processing............................................................................................................... 4.91
Figure 4.66 AC Mode Processing ...............................................................................................................4.92
Figure 4.67 Timing Diagram for Debounce Timer Operation When Operating in AC Mode.................... 4.92
Figure 4.68 Display Point Settings............................................................................................................4.100
Figure 4.69 Front-Panel Display—Both HV and LV Breakers Open....................................................... 4.100
Figure 4.70 Front-Panel Display—HV Breaker Closed, LV Breaker Open .............................................4.101
Figure 4.71 Front-Panel Display—Both HV and LV Breakers Closed.....................................................4.101
Figure 4.72 Front-Panel Display—HV Breaker Open, LV Breaker Closed .............................................4.101
Figure 4.73 Front-Panel Display—HV Breaker Open, LV Breaker Closed .............................................4.101
Figure 4.74 Front-Panel Display for a Binary Entry in the Name String Only......................................... 4.102
Figure 4.75 Front-Panel Display for an Analog Entry in the Name String Only......................................4.103
Figure 4.76 Front-Panel Display for an Entry in (a) Boolean Name and Alias Strings and
(b) Analog Name and User Text and Formatting Strings..................................................4.103
Figure 4.77 Front-Panel Display for an Entry in (a) Boolean Name and Alias Strings and
(b) Analog Name, User Text and Formatting Strings, and Engineering Units ................. 4.103
Figure 4.78 Adding Temperature Measurement Display Points...............................................................4.104
Figure 4.79 Rotating Display .................................................................................................................... 4.105
Figure 4.80 Adding Two Local Bits..........................................................................................................4.106
Figure 5.1 Complex Power Measurement Conventions..............................................................................5.2
Figure 5.2 METER Command Report With Voltage Option......................................................................5.4
Figure 5.3 METER DIF (Differential) Command Report........................................................................... 5.5
Figure 5.4 METER T Command Report With RTDs..................................................................................5.5
Figure 5.5 METER E Command Report.....................................................................................................5.6
Figure 5.6 METER RE Command Report.................................................................................................. 5.6
Figure 5.7 METER M Command Report....................................................................................................5.7
Figure 5.8 METER RM Command Response.............................................................................................5.8
Figure 5.9 MET MV Command Report...................................................................................................... 5.8
Figure 5.10 METER RMS Command Report............................................................................................... 5.9
Figure 5.11 METER AI Command Report...................................................................................................5.9
Figure 5.12 METER DEM Command Report ............................................................................................5.10
Figure 5.13 METER P Command Report...................................................................................................5.10
Figure 5.14 METER H Command Report .................................................................................................. 5.11
Figure 5.15 LDP Command Report ............................................................................................................ 5.12
Figure 5.16 Transformer Bank Subjected to Through Fault .......................................................................5.13
Figure 5.17 Category IV Transformers Through-Fault Protection Curves.................................................5.13
Figure 5.18 Through-Fault Diagram........................................................................................................... 5.15
Figure 5.19 Result of the TFE Command ...................................................................................................5.17
Figure 5.20 Preload the Values of the Accumulated Data........................................................................... 5.18
Figure 6.1 Front-Panel Setting Entry Example........................................................................................... 6.3
Figure 7.1 Simple Ethernet Network Configuration................................................................................... 7.3
Figure 7.2 Ethernet Network Configuration With Dual Redundant Connections (Failover Mode) ........... 7.3
Figure 7.3 Ethernet Network Configuration With Ring Structure (Switched Mode) .................................7.4
Figure 7.4 IRIG-B Input (Relay Terminals B01–B02) ............................................................................... 7.5
Figure 7.5 IRIG-B Input Via EIA-232 Port 3 (SEL Communications Processor as Source) ..................... 7.6
Figure 7.6 IRIG-B Input Via EIA-232 Port 3 (SEL-2401/2404/2407 Time Source).................................. 7.6
Figure 7.7 IRIG-B Input VIA Fiber-Optic EIA-232 Port 2 (SEL-2030/2032 Time Source)...................... 7.6

xiv List of Figures
SEL-787 Relay Instruction Manual Date Code 20150130
Figure 7.8 IRIG-B Input VIA Fiber-Optic EIA-232 Port 2 (SEL-2401/2404/2407 Time Source).............7.7
Figure 7.9 EIA-232 DB-9 Connector Pin Numbers ....................................................................................7.7
Figure 7.10 SEL Cable C234A—SEL-787 to DTE Device..........................................................................7.8
Figure 7.11 SEL Cable C227A—SEL-787 to DTE Device..........................................................................7.8
Figure 7.12 SEL Cable C222—SEL-787 to Modem....................................................................................7.8
Figure 7.13 SEL Cable C272A—SEL-787 to SEL Communications Processor
(Without IRIG-B Signal).......................................................................................................7.9
Figure 7.14 SEL Cable C273A—SEL-787 to SEL Communications Processor (With IRIG-B Signal)......7.9
Figure 7.15 SEL Cable C387—SEL-787 to SEL-3010 ................................................................................7.9
Figure 7.16 Ethernet Port (PORT 1) Status Report .....................................................................................7.24
Figure 7.17 Non-Redundant Port Response ................................................................................................7.24
Figure 7.18 GOOSE Command Response ..................................................................................................7.27
Figure 7.19 PING Command Response ......................................................................................................7.34
Figure 7.20 SHOW Command Example .....................................................................................................7.38
Figure 7.21 Typical Relay Output for STATUS S Command......................................................................7.41
Figure 8.1 Front-Panel Overview ................................................................................................................8.2
Figure 8.2 Access Level Security Padlock Symbol.....................................................................................8.3
Figure 8.3 Password Entry Screen...............................................................................................................8.4
Figure 8.4 Front-Panel Pushbuttons.............................................................................................................8.4
Figure 8.5 Main Menu.................................................................................................................................8.5
Figure 8.6 MAIN Menu and METER Submenu .........................................................................................8.6
Figure 8.7 METER Menu and ENERGY Submenu....................................................................................8.6
Figure 8.8 Relay Response When Demand, Peak Demand, Energy, or Max/Min Metering Is Reset.........8.6
Figure 8.9 Relay Response When No Analog Cards Are Installed.............................................................8.6
Figure 8.10 Relay Response When No Math Variables Enabled ..................................................................8.7
Figure 8.11 MAIN Menu and EVENTS Submenu........................................................................................8.7
Figure 8.12 EVENTS Menu and DISPLAY Submenu..................................................................................8.7
Figure 8.13 Relay Response When No Event Data Available.......................................................................8.7
Figure 8.14 Relay Response When Events Are Cleared ...............................................................................8.7
Figure 8.15 MAIN Menu and TARGETS Submenu .....................................................................................8.8
Figure 8.16 TARGETS Menu Navigation.....................................................................................................8.8
Figure 8.17 MAIN Menu and CONTROL Submenu....................................................................................8.8
Figure 8.18 CONTROL Menu and OUTPUTS Submenu.............................................................................8.9
Figure 8.19 CONTROL Menu and LOCAL BITS Submenu........................................................................8.9
Figure 8.20 MAIN Menu and SET/SHOW Submenu.................................................................................8.10
Figure 8.21 SET/SHOW Menu ...................................................................................................................8.11
Figure 8.22 MAIN Menu and Status Submenu...........................................................................................8.12
Figure 8.23 Factory-Default Front-Panel LEDs..........................................................................................8.12
Figure 8.24 Target Reset Pushbutton...........................................................................................................8.13
Figure 8.25 Operator Control Pushbuttons and LEDs.................................................................................8.14
Figure 9.1 Example Event Summary...........................................................................................................9.3
Figure 9.2 Sample Event History.................................................................................................................9.6
Figure 9.3 Example Standard 15-Cycle Analog Event Report 1/4-Cycle Resolution.................................9.9
Figure 9.4 Derivation of Analog Event Report Current Values and RMS Current Values From
Sampled Current Waveform ................................................................................................9.13
Figure 9.5 Derivation of Phasor RMS Current Values From Event Report Current Values......................9.14
Figure 9.6 Example Standard 15-cycle Digital Event Report (EVE D Command)
1/4 Cycle Resolution ...........................................................................................................9.18
Figure 9.7 Example Standard 15-cycle Differential Event Report (EVE DIF1 Command)
1/4 Cycle Resolution ...........................................................................................................9.21
Figure 9.8 Example Sequential Events Recorder (SER) Event Report.....................................................9.23
Figure 10.1 Low-Level Test Interface (J2 and J3).......................................................................................10.2
Figure 10.2 Three-Phase Wye AC Connections..........................................................................................10.5
Figure 10.3 Three-Phase Open-Delta AC Connections...............................................................................10.5
Figure 10.4 CTR1 Current Source Connections..........................................................................................10.7

xvList of Figures
Date Code 20150130 Instruction Manual SEL-787 Relay
Figure 10.5 CTR2 Current Source Connections ......................................................................................... 10.8
Figure 10.6 Wye Voltage Source Connections............................................................................................ 10.8
Figure 10.7 Delta Voltage Source Connections...........................................................................................10.9
Figure B.1 Firmware File Transfer Process.................................................................................................B.7
Figure C.1 SEL Communications Processor Star Integration Network.......................................................C.3
Figure C.2 Multitiered SEL Communications Processor Architecture .......................................................C.4
Figure C.3 Enhancing Multidrop Networks With SEL Communications Processors.................................C.6
Figure C.4 Example of SEL Relay and SEL Communications Processor Configuration ...........................C.7
Figure D.1 Application Confirmation Timing With URETRY n = 2.......................................................... D.7
Figure D.2 Message Transmission Timing ................................................................................................. D.8
Figure D.3 Sample Response to SHO DNP Command ............................................................................ D.23
Figure D.4 Port MAP Command .............................................................................................................. D.24
Figure D.5 Sample Custom DNP3 AI Map Settings................................................................................. D.26
Figure D.6 Analog Input Map Entry in ACSELERATOR QuickSet Software ............................................ D.27
Figure D.7 AI Point Label, Scaling and Dead Band in ACSELERATOR QuickSet Software .................... D.27
Figure D.8 Sample Custom DNP3 BO Map Settings............................................................................... D.28
Figure D.9 Binary Output Map Entry in ACSELERATOR QuickSet Software .......................................... D.28
Figure F.1 SEL-787 Predefined Reports ..................................................................................................... F.6
Figure F.2 SEL-787 Datasets ...................................................................................................................... F.8
Figure F.3 Goose Quality............................................................................................................................ F.9
Figure G.1 DeviceNet Card Component Overview.................................................................................... G.2
Figure H.1 Phase Reference........................................................................................................................ H.2
Figure H.2 Waveform at Relay Terminals May Have a Phase Shift...........................................................H.3
Figure H.3 Correction of Measured Phase Angle....................................................................................... H.3
Figure H.4 Sample MET PM Command Response.................................................................................. H.11

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Date Code 20150130 Instruction Manual SEL-787 Relay
Preface
R.Instruction Manual
Manual Overview
The SEL-787 Transformer Protection Relay Instruction Manual describes
common aspects of transformer relay application and use. It includes the
necessary information to install, set, test, and operate the relay.
An overview of each manual section and topics follows:
Preface. Describes the manual organization and conventions used to
present information.
Section 1: Introduction and Specifications. Describes the basic features
and functions of the SEL-787; lists the relay specifications.
Section 2: Installation. Describes how to mount and wire the SEL-787;
illustrates wiring connections for various applications.
Section 3: PC Software. Describes the features, installation methods, and
types of help available with the ACSELERATOR QuickSet®SEL-5030
Software.
Section 4: Protection and Logic Functions. Describes the operating
characteristic of each protection element, using logic diagrams and
text, and explains how to calculate element settings; describes contact
output logic, automation, and report settings.
Section 5: Metering and Monitoring. Describes the operation of each
metering function; describes the monitoring functions.
Section 6: Settings. Describes how to view, enter, and record settings for
protection, control, communications, logic, and monitoring.
Section 7: Communications. Describes how to connect the SEL-787 to a
PC for communication; shows serial port pinouts; lists and defines
serial port commands. Describes the communications port interfaces
and protocols supported by the relay for serial and Ethernet.
Section 8: Front-Panel Operations. Explains the features and use of the
front panel, including front-panel command menu, default displays,
and automatic messages.
Section 9: Analyzing Events. Describes front-panel LED operation, trip-
type front-panel messages, event summary data, standard event
reports, and Sequential Events Recorder (SER) report.
Section 10: Testing and Troubleshooting. Describes protection element
test procedures, relay self-test, and relay troubleshooting.
Appendix A: Firmware and Manual Versions. Lists the current relay
firmware version and details differences between the current and
previous versions. Provides a record of changes made to the manual
since the initial release.
Appendix B: Firmware Upgrade Instructions. Describes the procedure to
update the firmware stored in flash memory.
Appendix C: SEL Communications Processors. Provides examples of how
to use the SEL-787 with the SEL Communications Processors for total
substation automation solutions.

xviii
SEL-787 Relay Instruction Manual Date Code 20150130
Preface
Safety Information
Appendix D: DNP3 Communications. Describes the DNP3 protocol support
provided by the SEL-787.
Appendix E: Modbus RTU Communications. Describes the Modbus®
protocol support provided by the SEL-787.
Appendix F: IEC 61850 Communications. Describes IEC 61850
implementation in the SEL-787.
Appendix G: DeviceNet Communications. Describes the use of DeviceNet
(data-link and application protocol) over CAN (hardware protocol).
Appendix H: Synchrophasors. Describes the Phasor Measurement Control
Unit (PMCU), and accessing Synchrophasor data via ASCII
Command (MET PM) and IEEE C37.118 Protocol.
Appendix I: MIRRORED BITS Communications. Describes how SEL protective
relays and other devices can directly exchange information quietly,
securely, and with minimum cost.
Appendix J: Relay Word Bits. Lists and describes the Relay Word bits
(outputs of protection and control elements).
Appendix K: Analog Quantities. Lists and describes the Analog Quantities
(outputs of analog elements).
SEL-787 Relay Command Summary. Briefly describes the serial port
commands that are fully described in Section 7: Communications.
Safety Information
Dangers, Warnings,
and Cautions
This manual uses three kinds of hazard statements, defined as follows:
Safety Symbols The following symbols are often marked on SEL products.
DANGER
Indicates an imminently hazardous situation
that, if not avoided, will result in death or
serious injury.
WARNING
Indicates a potentially hazardous situation
that, if not avoided, could result in death or
serious injury.
CAUTION
Indicates a potentially hazardous situation
that, if not avoided, may result in minor or
moderate injury or equipment damage.
CAUTION
Refer to accompanying documents.
ATTENTION
Se reporter à la documentation.
Earth (ground) Terre
Protective earth (ground) Terre de protection
Direct current Courant continu