Schweitzer Engineering SEL-387-0 User manual

20170601
SEL-387-0, -5, -6 Relay
Current Differential
Overcurrent Relay
Data Recorder
Instruction Manual
*PM387-01-NB*

SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
© 1997–2017 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 selinc.com or contact your customer service
representative. PM387-01

Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Table of Contents
List of Tables ........................................................................................................................................................ v
List of Figures.................................................................................................................................................... vii
Preface................................................................................................................................................................... xi
Manual Overview ............................................................................................................................................. xi
Safety Information ........................................................................................................................................... xii
General Information ....................................................................................................................................... xiv
Section 1: Introduction and Specifications
Overview ......................................................................................................................................................... 1.1
Relay Functions............................................................................................................................................... 1.2
Application Ideas............................................................................................................................................. 1.4
Model Options ................................................................................................................................................. 1.7
Specifications .................................................................................................................................................. 1.8
Section 2: Installation
Overview ......................................................................................................................................................... 2.1
Relay Mounting............................................................................................................................................... 2.1
Rear-Panel Connections .................................................................................................................................. 2.5
Typical AC/DC Connections ......................................................................................................................... 2.12
Circuit Board Configuration.......................................................................................................................... 2.13
Section 3: Differential, Restricted Earth Fault, Thermal, and Overcurrent Elements
Overview ......................................................................................................................................................... 3.1
Differential Element ........................................................................................................................................ 3.1
Restricted Earth Fault Element...................................................................................................................... 3.25
Temperature Measurement (SEL-387-5 and SEL-387-6 Relays) ................................................................. 3.31
Thermal Element (SEL-387-6 Relay) ........................................................................................................... 3.32
Overcurrent Element ..................................................................................................................................... 3.48
Time-Overcurrent Curves.............................................................................................................................. 3.66
Section 4: Control Logic
Overview ......................................................................................................................................................... 4.1
Optoisolated Inputs.......................................................................................................................................... 4.2
Local Control Switches (All But SEL-387-0 Relay)....................................................................................... 4.2
Remote Control Switches ................................................................................................................................ 4.3
Multiple Setting Groups .................................................................................................................................. 4.4
SELOGIC Control Equation Sets (1—3) Variables ..........................................................................................4.8
Output Contacts............................................................................................................................................. 4.11
Rotating Default Display............................................................................................................................... 4.13
LED Targeting Logic..................................................................................................................................... 4.13
Trip and Close Logic ..................................................................................................................................... 4.16
SELOGIC Control Equations.......................................................................................................................... 4.20
Relay Word Bits............................................................................................................................................. 4.23
Section 5: Metering and Monitoring
Overview ......................................................................................................................................................... 5.1
Metering Functions.......................................................................................................................................... 5.1
Temperature Measurement (SEL-387-5 and SEL-387-6 Relays) ................................................................... 5.7
Station DC Battery Monitor ............................................................................................................................ 5.7
Breaker Monitor .............................................................................................................................................. 5.9
Thermal Monitor (SEL-387-6 Relay)............................................................................................................ 5.13

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SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Table of Contents
Through-Fault Event Monitor ....................................................................................................................... 5.18
Status Monitor ............................................................................................................................................... 5.23
Section 6: Setting the Relay
Overview ......................................................................................................................................................... 6.1
Settings Changes Via the Front Panel ............................................................................................................. 6.1
Settings Changes Via the Serial Port ............................................................................................................... 6.2
Additional Relay Settings................................................................................................................................ 6.3
Default Settings ............................................................................................................................................... 6.9
Settings Sheets............................................................................................................................................... 6.12
SEL-387-0, -5, -6 Relay Settings Sheets
SEL-387-0, -5, -6 Relay Settings Sheets Example
Section 7: Serial Port Communications and Commands
Overview ......................................................................................................................................................... 7.1
Establish Communication................................................................................................................................ 7.1
Communications Protocol ............................................................................................................................... 7.7
SEL ASCII Protocol Details............................................................................................................................ 7.9
SEL-387 Relay Command Summary
Section 8: Front-Panel Interface
Front-Panel Operation ..................................................................................................................................... 8.1
Pushbuttons...................................................................................................................................................... 8.3
Programmable LEDA, LEDB, LEDC ........................................................................................................... 8.16
Rotating Default Display............................................................................................................................... 8.17
Figures of Selected Front-Panel Menu Structures......................................................................................... 8.25
Section 9: Event Reports and SER
Overview ......................................................................................................................................................... 9.1
Standard 15-, 30-, or 60-Cycle Event Reports ................................................................................................ 9.2
Sequential Events Recorder (SER) Event Report.......................................................................................... 9.19
Section 10: Testing and Troubleshooting
Overview ....................................................................................................................................................... 10.1
Testing Methods and Tools............................................................................................................................ 10.1
Acceptance Testing........................................................................................................................................ 10.3
Commissioning Testing ............................................................................................................................... 10.32
Maintenance Testing.................................................................................................................................... 10.32
Relay Troubleshooting ................................................................................................................................ 10.33
Relay Calibration......................................................................................................................................... 10.37
Factory Assistance....................................................................................................................................... 10.38
SEL-387-0, -5, -6 Relay Commissioning Test Worksheet
Appendix A: Firmware and Manual Versions
Firmware......................................................................................................................................................... A.1
Instruction Manual.......................................................................................................................................... A.7
Appendix B: SEL-300 Series Relays Firmware Upgrade Instructions
Overview .........................................................................................................................................................B.1
Upgrade Procedure ..........................................................................................................................................B.2
Appendix C: SEL Distributed Port Switch Protocol (LMD)
Overview .........................................................................................................................................................C.1
Settings ............................................................................................................................................................C.1
Operation .........................................................................................................................................................C.2

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Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Table of Contents
Appendix D: Configuration, Fast Meter, and Fast Operate Commands
Overview ........................................................................................................................................................ D.1
Message Lists ................................................................................................................................................. D.1
Message Definitions ....................................................................................................................................... D.2
Appendix E: Compressed ASCII Commands
Overview .........................................................................................................................................................E.1
CASCII Command—General Format .............................................................................................................E.2
SEL-387-0, -5 Relay........................................................................................................................................E.3
SEL-387-6 Relay .............................................................................................................................................E.8
Appendix F: Unsolicited SER Protocol
Overview ......................................................................................................................................................... F.1
Recommended Message Usage ....................................................................................................................... F.1
Functions and Function Codes ........................................................................................................................ F.2
Appendix G: Distributed Network Protocol
Overview ........................................................................................................................................................ G.1
Configuration.................................................................................................................................................. G.1
Data-Link Operation....................................................................................................................................... G.3
Data Access Method....................................................................................................................................... G.3
DNP3 Documentation .................................................................................................................................... G.4
Point Remapping .......................................................................................................................................... G.16
SEL-387-5, -6 Relay DNP Port—SET P Settings Sheets
Appendix H: Protection Application Examples
Overview ........................................................................................................................................................ H.1
Transformer Winding and CT Connection Compensation Settings Examples .............................................. H.1
SEL-387 Relay Command Summary

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Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
List of Tables
Table 2.1 SEL-387 Communication Cable Numbers........................................................................... 2.11
Table 2.2 SEL-387 Second ALARM Contact Jumper Position........................................................... 2.15
Table 3.1 WnCTC Setting: Corresponding Phase and Direction of Correction .................................. 3.15
Table 3.2 Examples of Cooling Stages and MVA Ratings................................................................... 3.41
Table 3.3 Default Transformer Constants ............................................................................................ 3.45
Table 3.4 Overcurrent Element Summary............................................................................................ 3.49
Table 3.5 Equations Associated With U.S. Curves .............................................................................. 3.66
Table 3.6 Equations Associated With IEC Curves............................................................................... 3.66
Table 4.1 Definitions for Active Setting Group Switching SELOGIC Control Equation Settings
SS1 through SS6 ................................................................................................................... 4.5
Table 4.2 Active Setting Group Switching Input Logic......................................................................... 4.6
Table 4.3 SELOGIC Control Equation Settings for Rotating Selector Switch........................................ 4.7
Table 4.4 SELOGIC Control Equation Variables (SEL-387-0 Relay Only)............................................ 4.9
Table 4.5 SELOGIC Control Equation Variables (All But SEL-387-0 Relay)........................................ 4.9
Table 4.6 LED Assignments ................................................................................................................ 4.13
Table 4.7 SELOGIC Control Equation Operators ................................................................................. 4.20
Table 4.8 Maximums for SELOGIC Control Equations........................................................................ 4.23
Table 4.9 SEL-387 Relay Word Bits and Locations ............................................................................ 4.23
Table 4.10 Relay Word Bit Definitions.................................................................................................. 4.25
Table 4.11 Relay Word Bits Sorted Alphabetically ............................................................................... 4.36
Table 5.1 Thermal Element Conditions ............................................................................................... 5.14
Table 5.2 Using the THE Command to Access Data Reports.............................................................. 5.17
Table 5.3 Through-Fault Event Monitor Settings ................................................................................ 5.19
Table 5.4 Self-Test Alarm Limits......................................................................................................... 5.25
Table 6.1 Serial Port SET Commands.................................................................................................... 6.1
Table 6.2 SET Command Editing Keystrokes........................................................................................ 6.2
Table 7.1 Serial Port Pin Definitions...................................................................................................... 7.2
Table 7.2 SEL-387 Communication Cable Numbers............................................................................. 7.3
Table 7.3 Serial Communications Port Pin Function Definitions .......................................................... 7.6
Table 7.4 MET Command Choices...................................................................................................... 7.21
Table 7.5 Valid Password Characters ................................................................................................... 7.23
Table 7.6 Editing Keys for SET Commands........................................................................................ 7.26
Table 7.7 Settings for Each Communication Port................................................................................ 7.28
Table 7.8 TFE Command Choices ....................................................................................................... 7.36
Table 7.9 THE Command Choices....................................................................................................... 7.37
Table 7.10 Commands With Alarm Conditions ..................................................................................... 7.38
Table 7.11 Main Board Jumpers ............................................................................................................ 7.38
Table 8.1 Correspondence Between Local Control Switch Positions and Label Settings................... 8.11
Table 8.2 Correspondence Between Local Control Switch Types and Required Label Settings......... 8.11
Table 8.3 Front-Panel Pushbutton Serial Port Equivalents .................................................................. 8.16
Table 8.4 Dynamic Display Same-Line Overcurrent Elements ........................................................... 8.20
Table 8.5 Dynamic Display Mnemonics.............................................................................................. 8.22
Table 9.1 Event Types ............................................................................................................................ 9.4
Table 9.2 Winding Event Report Current Columns ............................................................................... 9.6
Table 9.3 Winding Event Report Output and Input Columns ................................................................ 9.7
Table 9.4 Digital Event Report Column Description............................................................................. 9.8
Table 9.5 Differential Event Report Current Columns ........................................................................ 9.12
Table 9.6 Differential Event Report Element Columns ....................................................................... 9.12
Table 9.7 Raw Winding Event Report Current Columns..................................................................... 9.15
Table 9.8 Raw Winding Event Report Outputs and Inputs .................................................................. 9.16
Table 9.9 Different SER Event Report Responses............................................................................... 9.20
Table 10.1 Features to Use to Test the Relay ......................................................................................... 10.1
Table 10.2 Instantaneous Overcurrent Elements and Corresponding Settings .................................... 10.11
Table 10.3 Time-Delayed Overcurrent Elements and Corresponding Settings ................................... 10.13

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SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
List of Tables
Table 10.4 Connection Compensation Factor ...................................................................................... 10.21
Table 10.5 Troubleshooting.................................................................................................................. 10.34
Table A.1 Firmware Revision History—SEL-387-0, -5, -6 Relay ........................................................ A.2
Table A.2 Manual Revision History—SEL-387-0, -5, -6 ...................................................................... A.7
Table A.3 Manual Revision History—SEL-387-0 Relay .................................................................... A.13
Table A.4 Manual Revision History—SEL-387-5, -6 Relay ............................................................... A.15
Table B.1 Troubleshooting New Firmware Upload..............................................................................B.13
Table D.1 Binary Message List.............................................................................................................. D.1
Table D.2 ASCII Configuration Message List....................................................................................... D.2
Table D.3 A5CO Relay Definition Block .............................................................................................. D.2
Table D.4 A5C1 Fast Meter Configuration Block ................................................................................. D.3
Table D.5 A5D1 Fast Meter Data Block................................................................................................ D.6
Table D.6 A5C2/A5C3 Demand/Peak Demand Fast Meter Configuration Messages........................... D.6
Table D.7 A5D2/A5D3 Demand/Peak Demand Fast Meter Message ................................................... D.9
Table D.8 A5CE Fast Operate Configuration Block.............................................................................. D.9
Table D.9 A5E0 Fast Operate Remote Bit Control.............................................................................. D.11
Table D.10 A5E3 Fast Operate Breaker Control ................................................................................... D.11
Table D.11 A5CD Fast Operate Reset Definition Block ....................................................................... D.11
Table D.12 A5ED Fast Operate Reset Command.................................................................................. D.12
Table D.13 A546 Temperature Data Block (SEL-387-5 and SEL-387-6)............................................. D.12
Table E.1 SEL-387 Compressed ASCII Commands ..............................................................................E.1
Table G.1 Data Needed to Configure a Port for DNP............................................................................ G.1
Table G.2 Data Access Methods............................................................................................................ G.3
Table G.3 SEL-387 DNP3 Device Profile .............................................................................................G.4
Table G.4 SEL-387 Relay DNP Object Table........................................................................................ G.5
Table G.5 SEL-387 Relay-Wye/Delta DNP Data Map.......................................................................... G.8
Table G.6 SEL-387-5 and SEL-387-6 Relays Continuation of Wye/Delta DNP Data Map................ G.12
Table G.7 SEL-387-5, -6 Relay Binary Input Lookup Table............................................................... G.14
Table H.1 WnCTC Setting: Corresponding Phase and Direction of Correction ................................... H.2
Table H.2 (A, B, C) to (H1, H2, H3) Phase-to-Bushing Connections ................................................... H.6
Table H.3 (A, C, B) to (H1, H2, H3) Phase-to-Bushing Connections ................................................... H.7
Table H.4 Quick Settings Guide for Common Transformer Configurations and Standard
Connections........................................................................................................................ H.20

Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
List of Figures
Figure 1.1 Functional Overview .............................................................................................................. 1.2
Figure 1.2 Transformer and Overcurrent Protection................................................................................ 1.4
Figure 1.3 Transformer and Low-Voltage Bus Protection....................................................................... 1.5
Figure 1.4 Bus and Feeder Protection...................................................................................................... 1.5
Figure 1.5 Unit Differential Protection.................................................................................................... 1.6
Figure 2.1 Relay Dimensions for Rack-Mount and Panel-Mount Models.............................................. 2.2
Figure 2.2 Front-Panel Drawings–Models 0387x0xxxH and 0387x1xxxH ............................................ 2.3
Figure 2.3 Front-Panel Drawings–Models 0387x0xxx3 and 0387x1xxx3.............................................. 2.4
Figure 2.4 Rear-Panel Drawings–Models 0387x0xxxxX and 0387x1xxxx2 .......................................... 2.6
Figure 2.5 Rear-Panel Drawings–Models 0387x1xxxx4 and 0387x1xxxx6 ........................................... 2.7
Figure 2.6 Rear-Panel Drawings–Models 0387xYxxxx6 and 0387xYxxxx2 ......................................... 2.8
Figure 2.7 Standard Independent Output Contact Representation ........................................................ 2.10
Figure 2.8 Example AC Connections (Three-Winding Transformer) ................................................... 2.12
Figure 2.9 Example DC Connections (Basic Version) .......................................................................... 2.13
Figure 2.10 Main Board Jumpers, Connections, and Battery Locations................................................. 2.18
Figure 2.11 Interface Board 2 Component Layout (Conventional Terminal Block)............................... 2.19
Figure 2.12 Interface Board 4 Component Layout (Conventional Terminal Block)............................... 2.20
Figure 2.13 Interface Board 6 Component Layout (Conventional Terminal Block)............................... 2.21
Figure 2.14 Interface Board 2 Component Layout (Connectorized)....................................................... 2.22
Figure 2.15 Interface Board 6 Component Layout (Connectorized)....................................................... 2.23
Figure 3.1 Percentage Restraint Differential Characteristic .................................................................... 3.2
Figure 3.2 Winding 1 Compensated Currents .........................................................................................3.3
Figure 3.3 Differential Element (87-1) Quantities (SEL-387-0) ............................................................. 3.3
Figure 3.4 Differential Element (87-1) Quantities (All But SEL-387-0) ................................................ 3.4
Figure 3.5 Differential Element Decision Logic ..................................................................................... 3.5
Figure 3.6 Differential Element Harmonic Blocking Logic .................................................................... 3.7
Figure 3.7 Differential Element (87BL1) Blocking Logic (SEL-387-0)................................................. 3.8
Figure 3.8 Differential Element (87BL1) Blocking Logic (All But SEL-387-0).................................... 3.8
Figure 3.9 DC Blocking (DCBL1) Logic (All But SEL-387-0).............................................................. 3.9
Figure 3.10 Primary Currents and Secondary Currents as Measured by the Relay ................................ 3.21
Figure 3.11 REF Enable/Block Logic ..................................................................................................... 3.26
Figure 3.12 REF Directional Element ..................................................................................................... 3.26
Figure 3.13 REF Protection Output (Extremely Inverse-Time O/C)....................................................... 3.27
Figure 3.14 REF Function, 32IOP Setting Guide.................................................................................... 3.29
Figure 3.15 Thermal Element Logic........................................................................................................ 3.33
Figure 3.16 Top-Oil and Hot-Spot Temperatures .................................................................................... 3.34
Figure 3.17 Example System Block Diagram ......................................................................................... 3.48
Figure 3.18 50Pn1 Phase Definite-Time O/C Element, Torque Controlled ............................................ 3.50
Figure 3.19 50Pn2 Phase Instantaneous O/C Element, Torque Controlled............................................. 3.50
Figure 3.20 50Pn3 and 50Pn4 Phase Instantaneous O/C Element, Nontorque Controlled ..................... 3.50
Figure 3.21 51Pn Phase Inverse-Time O/C Element, Torque Controlled................................................ 3.51
Figure 3.22 50Qn1 and 50Nn1 Sequence Definite-Time O/C Element, Torque Controlled................... 3.52
Figure 3.23 50Qn2 and 50Nn2 Sequence Instantaneous O/C Element, Torque Controlled.................... 3.52
Figure 3.24 51Qn and 51Nn Sequence Inverse-Time O/C Element, Torque Controlled ........................ 3.53
Figure 3.25 Combined Overcurrent Example..........................................................................................3.54
Figure 3.26 51PC1 and 51NC1 Combined Inverse-Time O/C Elements ................................................ 3.55
Figure 3.27 51PC2 and 51NC2 Combined Inverse-Time O/C Elements ................................................ 3.59
Figure 3.28 U. S. Moderately Inverse Curve: U1 ....................................................................................3.67
Figure 3.29 U.S. Inverse Curve: U2 ........................................................................................................ 3.68
Figure 3.30 U.S. Very Inverse Curve: U3................................................................................................ 3.69
Figure 3.31 U.S. Extremely Inverse Curve: U4....................................................................................... 3.70
Figure 3.32 U.S. Short-Time Inverse Curve: U5 .....................................................................................3.71
Figure 3.33 IEC Class A Curve (Standard Inverse): C1.......................................................................... 3.72
Figure 3.34 IEC Class B Curve (Very Inverse): C2................................................................................. 3.73

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SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
List of Figures
Figure 3.35 IEC Class C Curve (Extremely Inverse): C3........................................................................ 3.74
Figure 3.36 IEC Long-Time Inverse Curve: C4 ...................................................................................... 3.75
Figure 3.37 IEC Short-Time Inverse Curve: C5 ......................................................................................3.76
Figure 4.1 Remote Control Switches Drive Remote Bits RB1 Through RB16 ...................................... 4.3
Figure 4.2 Rotating Selector Switch for Active Setting Group Selection ............................................... 4.6
Figure 4.3 Timed Variables in SELOGIC Control Equation Sets ............................................................. 4.9
Figure 4.4 Traditional Latching Relay................................................................................................... 4.10
Figure 4.5 Latch Bits in SELOGIC Control Equation Sets..................................................................... 4.10
Figure 4.6 SEL-387 Front-Panel LEDs ................................................................................................. 4.13
Figure 4.7 SEL-387 Trip Logic (TRIP1)............................................................................................... 4.17
Figure 4.8 SEL-387 Close Logic (CLS1).............................................................................................. 4.18
Figure 5.1 SEL-387 Demand Ammeter Functions and Commands ........................................................ 5.6
Figure 5.2 Station DC Battery Monitor Alarm Logic.............................................................................. 5.8
Figure 5.3 Undervoltage and Overvoltage Warning and Alarm Regions ................................................ 5.8
Figure 5.4 Trip Bus Sensing With Relay Input......................................................................................5.10
Figure 5.5 Breaker Contact Wear Curve................................................................................................ 5.10
Figure 5.6 Distribution Feeder Faults Expose Transformer Bank to Through Faults ........................... 5.19
Figure 5.7 Through-Fault Triggering, Duration, and Maximum Current.............................................. 5.20
Figure 5.8 Cumulative I2t Alarm (Relay Word bit ISQTAL) ................................................................ 5.21
Figure 7.1 SEL-387 Serial Port Connectors ............................................................................................ 7.2
Figure 7.2 Access Level Relationship ................................................................................................... 7.13
Figure 8.1 SEL-387 Front-Panel User Interface...................................................................................... 8.1
Figure 8.2 Local Control Switch Configured as an ON/OFF Switch.................................................... 8.10
Figure 8.3 Local Control Switch Configured as an OFF/MOMENTARY Switch ................................ 8.11
Figure 8.4 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch ......................... 8.11
Figure 8.5 METER Menu and Display Structure .................................................................................. 8.25
Figure 8.6 EVENTS Display Structure ................................................................................................. 8.26
Figure 8.7 OTHER / BKR Menu and Display Structure ....................................................................... 8.27
Figure 8.8 SET Menu and Display Structure.........................................................................................8.28
Figure 9.1 Example Event Summary....................................................................................................... 9.4
Figure 9.2 Example Winding Event Report............................................................................................. 9.6
Figure 9.3 Example Digital Event Report ............................................................................................... 9.8
Figure 9.4 Example Differential Event Report......................................................................................9.11
Figure 9.5 Example Raw Winding Event Report .................................................................................. 9.15
Figure 9.6 Derivation of Event Report Current Values and RMS Current Values From Sampled
Current Waveform ............................................................................................................ 9.17
Figure 9.7 Derivation of Phasor RMS Current Values From Event Report Current Values.................. 9.18
Figure 9.8 Example SER Event Report ................................................................................................. 9.19
Figure 10.1 Low-Level Test Interface...................................................................................................... 10.2
Figure 10.2 Relay Part Number and Hardware Identification Sticker..................................................... 10.4
Figure 10.3 Test Connections for Balanced Load With Three-Phase Current Sources........................... 10.9
Figure 10.4 Test Connections for Balanced Load With Two-Phase Current Sources ........................... 10.10
Figure 10.5 Test Connections for Two Single Current Test Sources..................................................... 10.11
Figure 10.6 Percentage Restraint Differential Characteristic ................................................................ 10.20
Figure 10.7 Test Connections for Parallel Current Sources................................................................... 10.27
Figure B.1 Establishing a Connection......................................................................................................B.3
Figure B.2 Determining the Computer Serial Port...................................................................................B.3
Figure B.3 Determining Communications Parameters for the Computer ................................................B.4
Figure B.4 Setting Terminal Emulation ...................................................................................................B.4
Figure B.5 Terminal Emulation Startup Prompt ......................................................................................B.5
Figure B.6 Correcting the Port Setting.....................................................................................................B.5
Figure B.7 Correcting the Communications Parameters..........................................................................B.6
Figure B.8 Preparing HyperTerminal for ID Command Display. ............................................................B.7
Figure B.9 List of Commands Available in SELBOOT .............................................................................B.8
Figure B.10 Matching Computer to Relay Parameters ..............................................................................B.9
Figure B.11 Example Receive File Dialog Box .......................................................................................B.10
Figure B.12 Example Filename Identifying Old Firmware Version ........................................................B.10
Figure B.13 Downloading Old Firmware.................................................................................................B.10

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Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
List of Figures
Figure B.14 Selecting New Firmware to Send to the Relay.....................................................................B.12
Figure B.15 Transferring New Firmware to the Relay.............................................................................B.12
Figure B.16 Preparing HyperTerminal for ID Command Display...........................................................B.16
Figure H.1 Transformer Nameplate......................................................................................................... H.3
Figure H.2 Three-Line Diagram Showing System Phase-to-Transformer Bushing, CT, and
CT-to-Relay Connections .................................................................................................. H.4
Figure H.3 Primary Current Phasors ....................................................................................................... H.4
Figure H.4 Current at the Relay Terminals.............................................................................................. H.4
Figure H.5 Standard System Phase-to-Transformer Bushing Connections............................................. H.6
Figure H.6 X- and H-Side Current Phasors for Figure H.5..................................................................... H.6
Figure H.7 Non-Standard System Phase-to-Transformer Bushing Connections .................................... H.7
Figure H.8 X- and H-Side Current Phasors for Figure H.7..................................................................... H.7
Figure H.9 Combination of Standard and Non-Standard Phase-to-Bushing Connection Diagram ........ H.8
Figure H.10 X- and H-Side Current Phasors for Figure H.9..................................................................... H.8
Figure H.11 Standard CT Connections...................................................................................................... H.9
Figure H.12 Primary System Currents and Currents as Seen by the Relay............................................... H.9
Figure H.13 Current Flow With Reversed X-Side CT Polarity............................................................... H.10
Figure H.14 Current Flow With Reversed X-Side CT Polarity and Reversed Connections ................... H.11
Figure H.15 Results of Reversed X-Side CT Polarity and Reversed Connections ................................. H.11
Figure H.16 Delta-Wye Transformer With Standard Phase-to-Bushing Connections ............................ H.13
Figure H.17 Primary Currents and Secondary Currents as Measured by the Relay ............................... H.13
Figure H.18 Delta-Wye Transformer With Non-Standard Phase-to-Bushing Connections .................... H.14
Figure H.19 Primary Currents and Secondary Currents as Measured by the Relay ............................... H.14
Figure H.20 Wye-Delta Transformer With Non-Standard CT Connections on the X-Side .................... H.15
Figure H.21 X- and H-Side Current Phasors for Figure H.20................................................................. H.15
Figure H.22 Comparison of Standard and Non-Standard CT Connections on the X-Side of the
Transformer .....................................................................................................................H.16
Figure H.23 Autotransformer With Standard Phase-to-Bushing Connections........................................ H.17
Figure H.24 Primary Currents and Secondary Currents as Measured by the Relay ............................... H.17
Figure H.25 Delta-Wye Transformer With Standard Phase-to-Bushing Connections With an
ACB Phase Rotation ........................................................................................................ H.18
Figure H.26 X- and H-Side Current Phasors for Figure H.25................................................................. H.18
Figure H.27 Direction of Compensation Based on System Phase Rotation............................................ H.19
Figure H.28 Primary Currents and Secondary Currents as Measured by the Relay ............................... H.19
Figure H.29 Common Transformer Connections .................................................................................... H.20

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Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Preface
Manual Overview
The SEL-387 Relay Instruction Manual describes common aspects of the
application and use of this relay. It includes the necessary information to
install, set, test, and operate the relay and more detailed information about
settings and commands.
If you are unfamiliar with this relay, we suggest that you read the following
sections in the outlined order.
Section 1: Introduction and Specifications. Provides an introduction, relay
functional overview, and specifications.
Section 3: Differential, Restricted Earth Fault, Thermal, and Overcurrent
Elements. Describes the protection elements and their associated settings.
Section 4: Control Logic. Explains inputs, the Relay Word, outputs, and
logic. Use this section to understand the settings necessary for
implementing your logic.
Section 6: Setting the Relay. Describes methods for setting the device,
settings not explained in Section 3 or Section 4, and default settings.
Provides Settings Sheets with examples.
Section 7: Serial Port Communications and Commands. Explains the
serial port commands necessary for setting the relay for such functions
as control, obtaining target information, and obtaining metering
information.
Section 8: Front-Panel Interface. Describes use of the front panel to
perform the actions of serial port commands.
Section 5: Metering and Monitoring. Explains how to retrieve such
operations data as metering results, dc battery status, breaker wear,
through-fault event data, and relay status.
Section 9: Event Reports and SER. Reviews event report and sequential
events report generation, event report formats, sequential event reports,
and report interpretation.
Section 2: Installation. Provides information necessary for configuring,
installing, and wiring your relay.
Section 10: Testing and Troubleshooting. Includes test procedures and a
troubleshooting guide. Can serve as a tutorial and as a check of your
understanding of relay operation.
The appendices in this instruction manual provide helpful reference material.
Appendix A: Firmware and Manual Versions. Lists the present and
previous versions of relay firmware and explains differences. Provides
a record of changes to the manual since the initial release.
Appendix B: SEL-300 Series Relays Firmware Upgrade Instructions.
Describes the procedure to update the firmware stored in flash
memory.
Appendix C: SEL Distributed Port Switch Protocol (LMD). Describes the use
of this protocol.

xii
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Preface
Safety Information
Appendix D: Configuration, Fast Meter, and Fast Operate Commands.
Describes use of these commands in communicating ASCII and binary
messages over a single communications channel.
Appendix E: Compressed ASCII Commands. Describes commands that
produce machine-readable relay data for export to an external device.
Appendix F: Unsolicited SER Protocol. Describes a protocol certain
devices can use in receiving unsolicited binary data from the relay.
Appendix G: Distributed Network Protocol. Describes DNP3 protocol.
Appendix H: Protection Application Examples. Describes transformer
winding and CT connection compensation settings examples.
SEL-387 Relay Command Summary. Summarizes the serial port commands
fully described in Section 7.
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
Alternating current Courant alternatif
Both direct and alternating current Courant continu et alternatif
Instruction manual Manuel d’instructions

xiii
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Preface
Safety Information
Safety Marks The following statements apply to this device.
General Safety Marks
For use in Pollution Degree 2 environment. Pour l'utilisation dans un environnement de Degré de Pollution 2.
CAUTION
There is danger of explosion if the battery is incorrectly replaced.
Replace only with Ray-O-Vac®no. BR2335 or equivalent recommended
by manufacturer. See Owner's Manual for safety instructions. The
battery used in this device may present a fire or chemical burn hazard
if mistreated. Do not recharge, disassemble, heat above 100°C or
incinerate. Dispose of used batteries according to the manufacturer’s
instructions. Keep battery out of reach of children.
ATTENTION
Une pile remplacée incorrectement pose des risques d’explosion.
Remplacez seulement avec un Ray-O-Vac®no BR2335 ou un produit
équivalent recommandé par le fabricant. Voir le guide d’utilisateur
pour les instructions de sécurité. La pile utilisée dans cet appareil peut
présenter un risque d’incendie ou de brûlure chimique si vous en faites
mauvais usage. Ne pas recharger, démonter, chauffer à plus de 100°C
ou incinérer. Éliminez les vieilles piles suivant les instructions du
fabricant. Gardez la pile hors de la portée des enfants.
Other Safety Marks
DANGER
Contact with instrument terminals can cause electrical shock that can
result in injury or death.
DANGER
Tout contact avec les bornes de l’appareil peut causer un choc
électrique pouvant entraîner des blessures ou la mort.
DANGER
Removal of relay front panel exposes circuitry which may cause
electrical shock that can result in injury or death.
DANGER
Le retrait du panneau avant expose à la circuiterie qui pourrait être la
source de chocs électriques pouvant entraîner des blessures ou la
mort.
WARNING
Before working on a CT circuit, first apply a short to the secondary
winding of the CT.
AVERTISSEMENT
Avant de travailler sur un circuit TC, placez d’abord un court-circuit sur
l’enroulement secondaire du TC.
WARNING
Have only qualified personnel service this equipment. If you are not
qualified to service this equipment, you can injure yourself or others,
or cause equipment damage.
AVERTISSEMENT
Seules des personnes qualifiées peuvent travailler sur cet appareil. Si
vous n’êtes pas qualifiés pour ce travail, vous pourriez vous blesser
avec d’autres personnes ou endommager l’équipement.
WARNING
This device is shipped with default passwords. Default passwords
should be changed to private passwords at installation. Failure to
change each default password to a private password may allow
unauthorized access. SEL shall not be responsible for any damage
resulting from unauthorized access.
AVERTISSEMENT
Cet appareil est expédié avec des mots de passe par défaut. A
l’installation, les mots de passe par défaut devront être changés pour
des mots de passe confidentiels. Dans le cas contraire, un accès non-
autorisé á l’équipement peut être possible. SEL décline toute
responsabilité pour tout dommage résultant de cet accès non-
autorisé.
WARNING
Use of this equipment in a manner other than specified in this manual
can impair operator safety safeguards provided by this equipment.
AVERTISSEMENT
L’utilisation de cet appareil suivant des procédures différentes de
celles indiquées dans ce manuel peut désarmer les dispositifs de
protection d’opérateur normalement actifs sur cet équipement.
CAUTION
The continuous rating of the current inputs is 3 • Inom. For this test,
you may want to choose low values of U87P and TAPn, in order to limit
the required test current to a safe value.
ATTENTION
La limite, en régime permanent, des entrées de courant est 3 • Inom.
Pour ce test, vous pourriez choisir de valeurs peu élevées pour U87P
et TAPn, de façon à limiter le courant de test à une valeur sécuritaire.
CAUTION
The continuous rating of the current inputs is 3 • Inom. If any currents
in this test will exceed this rating, reduce the TAPn values as needed,
to prevent possible damage to the input circuits.
ATTENTION
La capacité, en régime permanent, des entrées de courant est 3 • Inom.
Si un courant d'essai dépassait cette valeur, réduire la prise TAPn pour
prévenir les dommages aux circuits d'entrée.
CAUTION
The relay contains devices sensitive to Electrostatic Discharge (ESD).
When working on the relay with the front panel removed, work
surfaces and personnel must be properly grounded or equipment
damage may result.
ATTENTION
Le relais contient des pièces sensibles aux décharges électrostatiques.
Quand on travaille sur le relais avec les panneaux avant ou du dessus
enlevés, toutes les surfaces et le personnel doivent être mis à la terre
convenablement pour éviter les dommages à l’équipement.

xiv
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Preface
General Information
General Information
Typographic
Conventions
There are three ways to communicate with the SEL-387:
➤Using a command line interface on a PC terminal emulation
window, such as Microsoft®HyperTerminal®.
➤Using the front-panel menus and pushbuttons.
➤Using ACSELERATOR QuickSet®SEL-5030 Software
The instructions in this manual indicate these options with specific font and
formatting attributes. The following table lists these conventions:
Examples This instruction manual uses several example illustrations and instructions to
explain how to effectively operate the SEL-387. These examples are for
demonstration purposes only; the firmware identification information or
settings values included in these examples may not necessarily match those in
the current version of your SEL-387.
Example Description
STATUS Commands typed at a command line interface on a PC.
<Enter> Single keystroke on a PC keyboard.
<Ctrl+D> Multiple/combination keystroke on a PC keyboard.
Start > Settings PC software dialog boxes and menu selections.
The > character indicates submenus.
{CLOSE} Relay front-panel pushbuttons.
ENABLE Relay front- or rear-panel labels.
MAIN > METER Relay front-panel LCD menus and relay responses visible on
the PC screen.
The > character indicates submenus.
SELOGIC control
equations
SEL trademarks and registered trademarks contain
the appropriate symbol on first reference in a section. In the
SEL-387 Instruction Manual, certain SEL trademarks appear in
small caps. These include SELOGIC control equations.
Modbus®Registered trademarks of other companies
include the registered trademark symbol with
the first occurrence of the term in a section.

Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Section 1
Introduction and Specifications
Overview
Use this relay to protect two- to four-winding power transformers, buses,
reactors, generators, large motors, or other multiterminal power apparatus.
Three- or four-terminal applications permit separate connection of current
transformers from two breakers connected to the same transformer winding,
such as in ring-bus or breaker-and-a-half schemes. The relay settings permit
you to use wye- or delta-connected current transformers with virtually any
type of transformer winding connection.
The SEL-387 Differential Relay provides three differential elements with dual
slope characteristics. The second slope provides security against CT saturation
for heavy through faults. Be sure to conduct detailed analysis of CT
performance under worst-case saturation conditions to set the relay
characteristic correctly for bus protection applications. For assistance with CT
selection, obtain SEL Application Guide 99-07 Bus Protection Using a Four-
Winding Low-Impedance Percentage Differential Relay from the SEL website
(selinc.com).

1.2
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Introduction and Specifications
Relay Functions
Relay Functions
Figure 1.1 Functional Overview
Current Differential
Protection
The SEL-387 includes independent restrained and unrestrained current
differential elements. The restrained element has a dual-slope, variable-
percentage restraint characteristic. A separate unrestrained differential
element provides faster clearance of high-magnitude, internal faults.
SEL-387-0 Relay
The relay provides security against conditions that may cause relay
misoperation, resulting from both system and transformer events. Use the
fifth-harmonic element to prevent relay misoperation during allowable
overexcitation conditions. Even-harmonic elements (second) provide security
against inrush currents during transformer energization. In the blocking mode,
the user selects either blocking on an individual phase basis or on a common
basis, as per application and philosophy. The second- and fifth-harmonic
thresholds are set independently.
SEL-387-5 Relay and SEL-387-6 Relay
These relays also provide security against conditions that may cause relay
misoperation, resulting from both system and transformer events. Use the
fifth-harmonic element to prevent relay misoperation during allowable
overexcitation conditions. Even-harmonic elements (second and fourth
∑
3
51 P
G
3
3
Combined
67G
1
3
Autotransformer
87
50
P
G
Q
51
P
G
Q
Overcurrent
- Phase
- Ground
- Neg. Seq.
Time Overcurrent
- Phase
- Ground
- Neg. Seq.
50
P
G
Q
51
P
G
Q
Overcurrent
- Phase
- Ground
- Neg. Seq.
Time Overcurrent
- Phase
- Ground
- Neg. Seq.
50
P
G
Q
51
P
G
Q
50
P
G
Q
51
P
G
Q
Overcurrent
- Phase
- Ground
- Neg. Seq.
Time Overcurrent
- Phase
- Ground
- Neg. Seq.
- Phase
Overcurrent
- Ground
- Neg. Seq.
Time Overcurrent
- Phase
- Ground
- Neg. Seq.
52
52
52
Phase, Ground, Neg. Seq.,
Differential, and Harmonic Metering
Restrained and
Unrestrained Differential Elements
Second- and Fifth-
Harmonic Blocking
CT and Transformer
Connection Compensation
Remote and
Local Control Switches
Restricted Earth
Fault (REF) (if the fourth
winding is not used in 87)
ASCII, Binary,
Distributed Port Switch, and
DNP3 Slave Communications
Event Reports and
Sequential Events Recorder
Breaker Wear, Station
Battery, and Thermal Monitors
SELOGIC®Control Equations
52
Temperature Measurement
(SEL-387-5 and SEL-387-6 Relays)

1.3
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Introduction and Specifications
Relay Functions
harmonic) provide security against inrush currents during transformer
energization, complemented by the dc element which measures the dc offset.
The even-harmonic element offers the choice between harmonic blocking and
harmonic restraint. In the blocking mode, the user selects either blocking on
an individual phase basis or on a common basis, as per application and
philosophy. The second-, fourth-, and fifth-harmonic thresholds are set
independently, and the dc blocking and harmonic restraint features are enabled
independently.
Restricted Earth Fault
Protection
The SEL-387 provides sensitive detection of internal ground faults via the
Restricted Earth Fault (REF) protection element. The Winding 4 inputs are
used for introduction of neutral CT polarizing current. Operating current is
derived from the residual current calculated for the protected winding. A
directional element determines whether the fault is internal or external.
Tripping is supervised by zero-sequence current thresholds and a positive-
sequence current restraint setting. The REF function is applicable to a single
grounded wye winding or an autotransformer with one breaker and set of CTs
at one terminal and either one or two breakers and sets of CTs at the other
terminal. Since the Winding 4 inputs are used for the neutral CT, only three of
the winding inputs may be used for normal differential or overcurrent
protection purposes.
Thermal Protection
(SEL-387-6 Relay)
The SEL-387-6 provides a thermal element based on advanced transformer
models. This thermal element calculates the operating temperature and
insulation aging of mineral-oil-immersed power transformers being protected
by the SEL-387-6. The element calculates operating temperature based on
load currents, type of cooling system, and/or actual temperature inputs
(ambient and top oil). It then uses operating temperature as a basis for
calculating the insulation aging acceleration factor (FAA) and loss-of-life
quantities. The thermal element asserts Relay Word bits to indicate alarm
conditions when the following quantities exceed settable limits:
➤Top-oil temperature
➤Winding hot-spot temperature
➤Insulation aging acceleration factor (FAA)
➤Daily loss of life
➤Total loss of life
Overcurrent
Protection
The SEL-387 provides nondirectional overcurrent elements for each winding/
terminal:
➤Phase Overcurrent: Three level instantaneous; definite time;
inverse time
➤Residual Overcurrent: Instantaneous; definite time; inverse
time
➤Negative-Sequence Overcurrent: Instantaneous; definite time;
inverse time
In addition, the SEL-387 has a special overcurrent function:
➤Combined overcurrent (inverse time, phase and ground), for
summed currents from Windings 1 and 2 and Windings 3 and 4
Overcurrent element pickup settings and operating characteristics are
independent of the differential element settings. Most elements can be torque
controlled.

1.4
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Introduction and Specifications
Application Ideas
Through-Fault Event
Monitor (SEL-387-5
and SEL-387-6)
Through faults are a major cause of transformer damage and failure. Fault
currents cause cumulative mechanical damage by displacing transformer
windings every time a fault occurs. Thermal stress from fault currents
damages insulation. The SEL-387-5 and the SEL-387-6 provide a through-
fault event monitor to gather fault current level, duration, and date/time for
each through fault. The monitor performs a simple I2t calculation and
cumulatively stores calculation results for each phase. Use these through-fault
event data to schedule proactive maintenance for transformers and to help
justify possible system enhancements to mitigate through faults.
Programmable
Optoisolated Inputs
and Output Contacts
The SEL-387 is equipped with enhanced SELOGIC®control equations that
allow you to design a custom tripping or control scheme. SELOGIC control
equation functions include independent timers, tripping, event report
triggering, and relay output contact control.
Application Ideas
Figure 1.2 Transformer and Overcurrent Protection
3
3
3
3
52
52
52
52
51 P
G
∑
Combined
87
50
P
G
Q
51
P
G
Q
50
P
G
Q
51
P
G
Q
50
P
G
Q
51
P
G
Q
50
P
G
Q
51
P
G
Q
51 P
G
∑
Combined