Sel SEL-421 User manual

Schweitzer Engineering Laboratories
2350 NE Hopkins Court
Pullman, WA USA 99163-5603
Tel: [phone] FAX: [phone]
SEL-421 Relay
SEL-421-1 Relay
Protection
Automation
Control
User’s Guide

Date Code 20020501 SEL-421/SEL-421-1 Relay
CAUTION: Equipment components are sensitive to
electrostatic discharge (ESD). Undetectable permanent
damage can result if you do not use proper ESD procedures.
Ground yourself, your work surface, and this equipment before
removing any cover from this equipment. If your facility is not
equipped to work with these components, contact SEL about
returning this device and related SEL equipment for service.
!
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. Dispose
of used batteries according to the manufacturer’s instructions.
!
DANGER: Disconnect or de-energize all external
connections before opening this device. Contact with
hazardous voltages and currents inside this device can cause
electrical shock resulting in injury or death.
!
DANGER: Contact with instrument terminals can
cause electrical shock that can result in injury or death.
!
WARNING: Use of this equipment in a manner other
than specified in this manual can impair operator safety
safeguards provided by this equipment.
!
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.
!
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.
!
ATTENTION: Les composants de cet équipement
sont sensibles aux décharges électrostatiques (DES). Des
dommages permanents non-décelables peuvent résulter de
l’absence de précautions contre les DES. Raccordez-vous
correctement à la terre, ainsi que la surface de travail et
l’appareil avant d’en retirer un panneau. Si vous n’êtes pas
équipés pour travailler avec ce type de composants, contacter
SEL afin de retourner l’appareil pour un service en usine.
!
ATTENTION: Il y a un danger d’explosion si la pile
électrique n’est pas correctement remplacée. Utiliser
exclusivement Ray-O-Vac® No. BR2335 ou un équivalent
recommandé par le fabricant. Se débarrasser des piles usagées
suivant les instructions du fabricant.
!
DANGER: Débrancher tous les raccordements
externes avant d’ouvrir cet appareil. Tout contact avec des
tensions ou courants internes à l’appareil peut causer un choc
électrique pouvant entraîner des blessures ou la mort.
!
DANGER: Tout contact avec les bornes de l’appareil
peut causer un choc électrique pouvant entraîner des
blessuers ou la mort.
!
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.
!
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.
!
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 accés non-autorisé á
l’équipement peut être possible. SEL décline toute
responsabilité pour tout dommage résultant de cet accés non-
autorisé.
!
Schweitzer Engineering Laboratories, SELOGIC, Connectorized, Job Done, SEL-PROFILE, ACSELERATOR, and are
registered trademarks of Schweitzer Engineering Laboratories. All brand or product names appearing in this document
are the trademark or registered trademark of their respective holders.
The software (firmware), schematic drawings, relay commands, and relay messages are copyright protected by the
United States Copyright Law and International Treaty provisions. All rights are reserved.
You may not copy, alter, disassemble, or reverse-engineer the software. You may not provide the software to any third
party.
The information in this manual is furnished for informational use only and is subject to change without notice.
The English language manual is the only approved SEL manual.
This product is covered by U.S. Patent Numbers: 4,996,624; 5,041,737; 5,317,472; 5,325,061; 5,349,490; 5,365,396;
5,367,426; 5,479,315; 5,515,227; 5,652,688; 5,694,281; 5,703,745; 5,731,943; 5,790,418; 5,793,750; 5,883,578;
5,914,663; 6,028,754; 6,084,755; U.S. and Foreign Patent(s) Pending.
This product is covered by the standard SEL 10-year warranty. For warranty details, visit www.selinc.com or contact
your customer service representative.
ã2001, 2002 Schweitzer Engineering Laboratories. All rights reserved. PM421-01

Date Code 20020501 SEL-421/SEL-421-1 Relay
Table of Contents
List of Tables ....................................................................................................................................................... ix
List of Figures................................................................................................................................................. xxiii
List of Equations..........................................................................................................................................xxxiii
List of Examples.......................................................................................................................................... xxxvii
Manual Change Information.................................................................................................................... xxxix
Preface.................................................................................................................................................................. xli
User’s Guide
Section 1: Introduction and Specifications
Features........................................................................................................................................................ U.1.2
Models and Options..................................................................................................................................... U.1.5
Applications................................................................................................................................................. U.1.6
Specifications ............................................................................................................................................ U.1.11
Section 2: Installation
Shared Configuration Attributes.................................................................................................................. U.2.2
Plug-In Boards........................................................................................................................................... U.2.12
Jumpers...................................................................................................................................................... U.2.17
Front-Panel Labels..................................................................................................................................... U.2.26
Relay Placement ........................................................................................................................................ U.2.31
Connection................................................................................................................................................. U.2.33
AC/DC Connection Diagrams................................................................................................................... U.2.47
Section 3: PC Software
Installing the Computer Software................................................................................................................ U.3.2
Communications Setup................................................................................................................................ U.3.4
Settings Database Management and Drivers............................................................................................... U.3.6
Create and Manage Relay Settings.............................................................................................................. U.3.9
Expression Builder .................................................................................................................................... U.3.13
Analyze Events.......................................................................................................................................... U.3.15
HMI Meter and Control............................................................................................................................. U.3.19
Section 4: Basic Relay Operations
Inspecting a New Relay............................................................................................................................... U.4.2
Connecting and Applying Power................................................................................................................. U.4.4
Establishing Communication....................................................................................................................... U.4.5
Changing the Default Passwords................................................................................................................. U.4.8
Checking Relay Status............................................................................................................................... U.4.12
Making Simple Settings Changes.............................................................................................................. U.4.15
Examining Metering Quantities ................................................................................................................ U.4.31
Reading Oscillograms, Event Reports, and SER....................................................................................... U.4.39
Operating the Relay Inputs and Outputs ................................................................................................... U.4.52
Configuring High-Accuracy Timekeeping................................................................................................ U.4.66
Readying the Relay for Field Application................................................................................................. U.4.72

iv
SEL-421/SEL-421-1 Relay Date Code 20020501
Table of Contents
Section 5: Front-Panel Operations
Front-Panel Layout ......................................................................................................................................U.5.2
Front-Panel Menus and Screens ..................................................................................................................U.5.9
Front-Panel Automatic Messages ..............................................................................................................U.5.28
Operation and Target LEDs .......................................................................................................................U.5.30
Front-Panel Operator Control Pushbuttons................................................................................................U.5.34
Section 6: Testing and Troubleshooting
Testing Philosophy.......................................................................................................................................U.6.2
Testing Features and Tools...........................................................................................................................U.6.5
Relay Test Connections................................................................................................................................U.6.9
Test Methods..............................................................................................................................................U.6.14
Checking Relay Operation......................................................................................................................... U.6.24
Relay Self-Tests .........................................................................................................................................U.6.37
Relay Troubleshooting...............................................................................................................................U.6.40
Factory Assistance .....................................................................................................................................U.6.43
Appendix A: Firmware Versions
Firmware Versions ...................................................................................................................................... U.A.1
Application’s Handbook
Section 1: Protection Application Examples
Introduction.................................................................................................................................................. A.1.1
230 kV Overhead Transmission Line Example ...........................................................................................A.1.3
500 kV Parallel Transmission
Lines With Mutual Coupling Example....................................................................................................A.1.20
345 kV Tapped Overhead Transmission Line Example ............................................................................A.1.53
EHV Parallel 230 kV Underground Cables Example................................................................................A.1.86
Out-of-Step Logic Application Examples ............................................................................................... A.1.118
Auto-Reclose Example ............................................................................................................................ A.1.136
Auto-Reclose and Synchronism Check Example ....................................................................................A.1.140
Circuit Breaker Failure Application Examples........................................................................................A.1.151
Section 2: Monitoring and Metering
Circuit Breaker Monitor...............................................................................................................................A.2.2
Station DC Battery System Monitor.......................................................................................................... A.2.22
Metering.....................................................................................................................................................A.2.28
Section 3: Analyzing Data
Data Processing............................................................................................................................................ A.3.2
Triggering Data Captures and Event Reports ..............................................................................................A.3.4
Duration of Data Captures and Event Reports.............................................................................................A.3.6
Oscillography...............................................................................................................................................A.3.8
Event Reports, Event Summaries, and Event Histories.............................................................................A.3.12
SER (Sequential Events Recorder) ............................................................................................................A.3.34
Section 4: Time-Synchronized Measurements
Relay Configuration for High-Accuracy Timekeeping ............................................................................... A.4.2
Fault Analysis ..............................................................................................................................................A.4.6
Power Flow Analysis ...................................................................................................................................A.4.7
State Estimation Verification .....................................................................................................................A.4.10
Section 5: Substation Automatic Restoration
230 kV Tapped Transmission Line Application Example ...........................................................................A.5.2

v
Date Code 20020501 SEL-421/SEL-421-1 Relay
Table of Contents
Section 6: SEL-2030 Applications
SEL Communications Processor ................................................................................................................. A.6.2
SEL-2030 and SEL-421 Relay Architecture ............................................................................................... A.6.4
SEL-2030 Example ..................................................................................................................................... A.6.6
Section 7: Direct Network Communication
Direct Network Communication ................................................................................................................. A.7.2
Serial Networking........................................................................................................................................ A.7.3
SEL-2701 Ethernet Processor...................................................................................................................... A.7.5
Direct Networking Example........................................................................................................................ A.7.7
Reference Manual
Section 1: Protection Functions
Current and Voltage Source Selection..........................................................................................................R.1.2
Frequency Estimation.................................................................................................................................R.1.10
Fault Location.............................................................................................................................................R.1.11
Open Phase Detection Logic ......................................................................................................................R.1.13
Pole Open Logic.........................................................................................................................................R.1.14
LOP Logic ..................................................................................................................................................R.1.16
FIDS Logic .................................................................................................................................................R.1.20
Ground Directional Element.......................................................................................................................R.1.21
Phase and Negative-Sequence Directional Elements.................................................................................R.1.33
Directionality..............................................................................................................................................R.1.35
CVT Transient Detection............................................................................................................................R.1.36
Series-Compensation Line Logic ...............................................................................................................R.1.38
Load-Encroachment Logic .........................................................................................................................R.1.39
OOS Logic..................................................................................................................................................R.1.41
Mho Ground Distance Elements ................................................................................................................R.1.46
Quadrilateral Ground Distance Elements...................................................................................................R.1.51
Mho Phase Distance Elements ...................................................................................................................R.1.55
Zone Time Delay ........................................................................................................................................R.1.59
Instantaneous Line Overcurrent Elements..................................................................................................R.1.62
Inverse Time-Overcurrent Elements ..........................................................................................................R.1.69
SOTF Logic................................................................................................................................................R.1.85
Communications-Assisted Tripping Logic.................................................................................................R.1.88
DCB Scheme ..............................................................................................................................................R.1.89
POTT Scheme ............................................................................................................................................R.1.93
DCUB Scheme Logic .................................................................................................................................R.1.99
Trip Logic .................................................................................................................................................R.1.103
Circuit Breaker Failure Protection............................................................................................................R.1.112
Section 2: Auto-Reclose and Synchronism Check
Auto-Reclose ................................................................................................................................................R.2.2
One-Circuit-Breaker Recloser......................................................................................................................R.2.5
Two-Circuit-Breaker Recloser....................................................................................................................R.2.11
Voltage Checks ...........................................................................................................................................R.2.27
Relay Settings and Relay Word Bits...........................................................................................................R.2.29
Synchronism Check....................................................................................................................................R.2.41

vi
SEL-421/SEL-421-1 Relay Date Code 20020501
Table of Contents
Section 3: SELOGIC®Control Equation Programming
SELOGIC Control Equation History............................................................................................................. R.3.2
Separation of Protection and Automation Areas ......................................................................................... R.3.3
SELOGIC Control Equation Programming................................................................................................... R.3.5
SELOGIC Control Equation Setting Structure.............................................................................................. R.3.8
SELOGIC Control Equation Capacity......................................................................................................... R.3.10
SELOGIC Control Equation Elements ........................................................................................................ R.3.11
SELOGIC Control Equation Operators ....................................................................................................... R.3.24
Effective Programming.............................................................................................................................. R.3.34
SEL-311 and SEL-351 Series Users .......................................................................................................... R.3.36
Section 4: Communications Interfaces
Communications Interfaces ......................................................................................................................... R.4.2
Serial Communication ................................................................................................................................. R.4.3
Communications Card ................................................................................................................................. R.4.6
Section 5: SEL Communications Protocols
Serial Port Hardware Protocol ..................................................................................................................... R.5.2
Software Protocol Selections ....................................................................................................................... R.5.4
Protocol Active When Setting PROTO := SEL........................................................................................... R.5.5
Virtual File Interface.................................................................................................................................. R.5.14
SEL MIRRORED BITS Communications ..................................................................................................... R.5.18
SEL Distributed Port Switch Protocol (LMD) .......................................................................................... R.5.25
Section 6: DNP 3.0 Communications
Introduction to DNP 3.0............................................................................................................................... R.6.2
DNP 3.0 in the SEL-421 Relay.................................................................................................................... R.6.6
DNP 3.0 Documentation............................................................................................................................ R.6.13
Application Example ................................................................................................................................. R.6.29
Section 7: UCA2 Communications
Introduction to UCA2 .................................................................................................................................. R.7.2
UCA2 in the SEL-421 Relay ....................................................................................................................... R.7.5
GOOSE Application Example ..................................................................................................................... R.7.7
Section 8: ASCII Command Reference
Description of Commands ........................................................................................................................... R.8.2
Section 9: Settings
Global Settings............................................................................................................................................. R.9.3
Breaker Monitor Settings............................................................................................................................. R.9.8
Group Settings ........................................................................................................................................... R.9.11
Protection Free-Form SELOGIC Control Equations................................................................................... R.9.29
Automation Free-Form SELOGIC Control Equations ................................................................................ R.9.30
Output Settings .......................................................................................................................................... R.9.31
Front-Panel Settings................................................................................................................................... R.9.33
Report Settings........................................................................................................................................... R.9.36
Port Settings............................................................................................................................................... R.9.38
DNP 3.0 Settings........................................................................................................................................ R.9.43
Appendix A: Relay Word Bits
Alphabetic................................................................................................................................................... R.A.2
Row List.................................................................................................................................................... R.A.19
Appendix B: Analog Quantities
Analog Quantities ....................................................................................................................................... R.B.2

vii
Date Code 20020501 SEL-421/SEL-421-1 Relay
Table of Contents
Appendix C: GOMSFE Tables
Introduction .................................................................................................................................................R.C.1
GOMSFE Tables .........................................................................................................................................R.C.2
SEL-421 Relay Domains.............................................................................................................................R.C.3
SEL-421 Relay Domain–LN0 .....................................................................................................................R.C.4
SEL-421 Relay Virtual Device Domain......................................................................................................R.C.9
Special Translation Rules ..........................................................................................................................R.C.17
Glossary............................................................................................................................................................GL.1
Index................................................................................................................................................................... IN.1

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Date Code 20020501 SEL-421/SEL-421-1 Relay
List of Tables
User’s Guide
Section 1: Introduction and Specifications
Table 1.1 Application Highlights ....................................................................................................... U.1.9
Section 2: Installation
Table 2.1 I/O Interface Boards Control Inputs................................................................................. U.2.12
Table 2.2 I/O Interface Boards Control Outputs .............................................................................. U.2.13
Table 2.3 Main Board Jumpers ........................................................................................................ U.2.19
Table 2.4 Main Board Jumpers—JMP1, JMP2, and JMP3.............................................................. U.2.20
Table 2.5 I/O Board Jumpers ........................................................................................................... U.2.25
Table 2.6 Configurable Front-Panel Label Kits ............................................................................... U.2.27
Table 2.7 Options for Configurable Front-Panel Labels.................................................................. U.2.28
Table 2.8 Fuse Requirements for the SEL-421 Relay Power Supply .............................................. U.2.38
Section 3: PC Software
Table 3.1 System Requirements for ACSELERATOR Software .......................................................... U.3.2
Table 3.2 ACSELERATOR HMI Tree View Functions ...................................................................... U.3.20
Section 4: Basic Relay Operations
Table 4.1 Power Supply Voltage Inputs ............................................................................................. U.4.4
Table 4.2 General Serial Port Settings ............................................................................................... U.4.6
Table 4.3 SEL-421 Relay Access Levels ........................................................................................... U.4.8
Table 4.4 Access Level Commands and Passwords........................................................................... U.4.9
Table 4.5 Settings Classes and Instances ....................................................................................... U.4.17
Table 4.6 Actions at Settings Prompts ............................................................................................. U.4.19
Table 4.7 Actions at Text-Edit Mode Prompts................................................................................. U.4.21
Table 4.8 Time Source Automatic Switching Enable Settings ........................................................ U.4.66
Table 4.9 Date/Time Last Update Sources....................................................................................... U.4.69
Table 4.10 Communications Port Commands That Clear Relay Buffers .......................................... U.4.73
Section 5: Front-Panel Operations
Table 5.1 Front-Panel Inactivity Time-Out Setting............................................................................ U.5.3
Table 5.2 Metering Screens Enable Settings...................................................................................... U.5.4
Table 5.3 Display Point Settings ........................................................................................................ U.5.7
Table 5.4 Local Bit Control Settings................................................................................................ U.5.19
Table 5.5 Settings Available From the Front Panel.......................................................................... U.5.21
Table 5.6 TIME Target LED Trigger Elements–Factory Defaults................................................... U.5.32
Table 5.7 Operator Control Pushbuttons and LEDs—Factory Defaults .......................................... U.5.34
Section 6: Testing and Troubleshooting
Table 6.1 Acceptance Testing ............................................................................................................ U.6.2
Table 6.2 Commissioning Testing...................................................................................................... U.6.3
Table 6.3 Maintenance Testing .......................................................................................................... U.6.3
Table 6.4 UUT Database Entries for SEL-5401 Relay Test System Software—5 A Relay .............. U.6.8
Table 6.5 UUT Database Entries for SEL-5401 Relay Test System Software—1 A Relay .............. U.6.8
Table 6.6 Phase Instantaneous Overcurrent Pickup ......................................................................... U.6.14
Table 6.7 Selectable Operating Quantity Time-Overcurrent Element (51S1) Default Settings ...... U.6.20
Table 6.8 Negative-Sequence Directional Element Settings AUTO Calculations........................... U.6.31
Table 6.9 Troubleshooting Procedures............................................................................................. U.6.40
Appendix A: Firmware Versions
Table A.1 Firmware Versions............................................................................................................. U.A.1

xList of Tables
SEL-421/SEL-421-1 Relay Date Code 20020501
Applications Handbook
Section 1: Protection Application Examples
Table 1.1 System Data—230 kV Overhead Transmission Line.........................................................A.1.3
Table 1.2 Secondary Impedances ....................................................................................................... A.1.4
Table 1.3 LOP Enable Options...........................................................................................................A.1.7
Table 1.4 Options for Enabling Pole-Open Logic ............................................................................ A.1.13
Table 1.5 Setting TULO Unlatch Trip Options ................................................................................A.1.14
Table 1.6 SEL-421 Relay Settings....................................................................................................A.1.16
Table 1.7 System Data—500 kV Parallel Overhead Transmission Lines ........................................A.1.21
Table 1.8 Secondary Impedances ..................................................................................................... A.1.21
Table 1.9 LOP Enable Options.........................................................................................................A.1.26
Table 1.10 Tilt Resulting From Nonhomogeneity.............................................................................. A.1.31
Table 1.11 Options for Enabling Pole-Open Logic ............................................................................A.1.37
Table 1.12 Trip Unlatch Options ........................................................................................................A.1.41
Table 1.13 General Global Settings....................................................................................................A.1.46
Table 1.14 System Data–345 kV Tapped Overhead Transmission Line ............................................A.1.54
Table 1.15 Secondary Impedances .....................................................................................................A.1.55
Table 1.16 LOP Enable Options.........................................................................................................A.1.59
Table 1.17 Local Zone 2 Fault Impedance Measurements.................................................................A.1.61
Table 1.18 Apparent Impedance Measurement for Remote Faults ....................................................A.1.62
Table 1.19 Options for Enabling Pole-Open Logic ............................................................................A.1.76
Table 1.20 Setting TULO Unlatch Trip Options ................................................................................ A.1.80
Table 1.21 SEL-421 Relay Settings....................................................................................................A.1.81
Table 1.22 System Data—230 kV Parallel Underground Cables....................................................... A.1.87
Table 1.23 Secondary Impedances .....................................................................................................A.1.87
Table 1.24 LOP Enable Options.........................................................................................................A.1.92
Table 1.25 Tilt Resulting From Nonhomogeneity.............................................................................. A.1.96
Table 1.26 XAG Measurement for Remote AG Fault
(k01 = 0.374 –—39.2°, sheath and ground return path)..................................................A.1.98
Table 1.27 XAG Measurement for Remote AG Fault (k01 = 0.385 –—46.7°, sheath return path)...A.1.99
Table 1.28 XAG Measurement for Remote AG Fault (k0 = 6.105 –44.5°, ground return path) ....... A.1.99
Table 1.29 Options for Enabling Pole-Open Logic ..........................................................................A.1.108
Table 1.30 Setting TULO Unlatch Trip Options .............................................................................. A.1.111
Table 1.31 General Global Settings.................................................................................................. A.1.113
Table 1.32 Positive-Sequence Impedances (Secondary) .................................................................. A.1.118
Table 1.33 Automatically Calculated/Hidden Settings ....................................................................A.1.127
Table 1.34 Relay Configuration (Group)..........................................................................................A.1.128
Table 1.35 Out-of-Step Tripping/Blocking.......................................................................................A.1.128
Table 1.36 Automatically Calculated/Hidden Settings ....................................................................A.1.134
Table 1.37 Relay Configuration (Group)..........................................................................................A.1.134
Table 1.38 Out-of-Step Tripping/Blocking.......................................................................................A.1.135
Table 1.39 SEL-421 Relay Settings..................................................................................................A.1.139
Table 1.40 SEL-421 Relay Settings..................................................................................................A.1.148
Table 1.41 Secondary Quantities ...................................................................................................... A.1.155
Table 1.42 Relay Configuration (Group)..........................................................................................A.1.160
Table 1.43 Secondary Quantities ...................................................................................................... A.1.161
Table 1.44 Relay Configuration (Group)..........................................................................................A.1.168
Section 2: Monitoring and Metering
Table 2.1 Circuit Breaker Monitor Configuration.............................................................................. A.2.3
Table 2.2 Circuit Breaker Maintenance Information—Example........................................................A.2.4
Table 2.3 Contact Wear Monitor Settings—Circuit Breaker 1...........................................................A.2.5
Table 2.4 Circuit Breaker Monitor Initiate SELOGIC Control Equations...........................................A.2.7
Table 2.5 Circuit Breaker Monitor Close SELOGIC Control Equations ............................................. A.2.9
Table 2.6 BRE Command.................................................................................................................A.2.18
Table 2.7 DC Monitor Settings and Relay Word Bit Alarms ...........................................................A.2.23
Table 2.8 Example DC Battery Voltage Conditions.........................................................................A.2.24

xiList of Tables
Date Code 20020501 SEL-421/SEL-421-1 Relay
Table 2.9 Example DC Battery Monitor Settings—125 Vdc for Vdc1 and 48 Vdc for Vdc2......... A.2.24
Table 2.10 Example DC Battery Monitor Settings—AC Ripple Voltages ........................................ A.2.25
Table 2.11 Example DC Battery Monitor Settings—Ground Detection Factor (EGADVS := Y) .... A.2.26
Table 2.12 MET Command—Metering Only .................................................................................... A.2.29
Table 2.13 Instantaneous Metering Quantities—Voltages, Currents, Frequency .............................. A.2.30
Table 2.14 Instantaneous Metering Quantities—Powers ................................................................... A.2.31
Table 2.15 Instantaneous Metering Accuracy—Voltages, Currents, and Frequency......................... A.2.32
Table 2.16 Instantaneous Metering Accuracy—Power...................................................................... A.2.32
Table 2.17 Maximum/Minimum Metering Quantities—
Voltages, Currents, Frequency, and Powers.................................................................... A.2.34
Table 2.18 Demand and Peak Demand Metering Quantities—(LINE) ............................................. A.2.36
Table 2.19 Rolling Demand Calculations .......................................................................................... A.2.37
Table 2.20 Demand Metering Settings............................................................................................... A.2.39
Table 2.21 Energy Metering Quantities—(LINE).............................................................................. A.2.41
Table 2.22 Synchrophasor Port Settings ............................................................................................ A.2.42
Section 3: Analyzing Data
Table 3.1 Report Settings ................................................................................................................... A.3.6
Table 3.2 Event Report Nonvolatile Storage Capability .................................................................... A.3.7
Table 3.3 EVE Command ................................................................................................................ A.3.13
Table 3.4 EVE Command Examples................................................................................................ A.3.14
Table 3.5 Event Report Metered Analog Quantities ........................................................................ A.3.15
Table 3.6 Event Types ...................................................................................................................... A.3.29
Table 3.7 SUM Command................................................................................................................ A.3.30
Table 3.8 HIS Command.................................................................................................................. A.3.32
Table 3.9 SER Commands ............................................................................................................... A.3.35
Section 4: Time-Synchronized Measurements
Table 4.1 SEL-421 Relay Voltage and Current Measurement ........................................................... A.4.8
Section 5: Substation Automatic Restoration
Table 5.1 Global Settings ................................................................................................................... A.5.6
Table 5.2 Breaker Monitor Settings ................................................................................................... A.5.6
Table 5.3 Group Settings.................................................................................................................... A.5.7
Table 5.4 Protection Free-Form SELOGIC Control Equations ........................................................... A.5.9
Table 5.5 Control Inputs................................................................................................................... A.5.12
Table 5.6 Control Outputs (SELOGIC Control Equations) ............................................................... A.5.12
Section 6: SEL-2030 Applications
Table 6.1 SEL-2020 and SEL-2030 Communications Processor Protocol Interfaces ....................... A.6.3
Table 6.2 SEL-2030 Port 1 Settings................................................................................................... A.6.6
Table 6.3 SEL-2030 Data Collection Automessages ......................................................................... A.6.6
Table 6.4 SEL-2030 Port 1 Automatic Messaging Settings............................................................... A.6.7
Table 6.5 SEL-2030 Port 1 Region Map............................................................................................ A.6.7
Table 6.6 SEL-2030 METER Region Map ........................................................................................ A.6.8
Table 6.7 SEL-2030 TARGET Region .............................................................................................. A.6.9
Section 7: Direct Network Communication
Table 7.1 DNP 3.0 Feature Summary ................................................................................................ A.7.3
Table 7.2 Ethernet Connection Options ............................................................................................. A.7.5
Table 7.3 SEL-421 Relay Port 5 Settings........................................................................................... A.7.8

xii List of Tables
SEL-421/SEL-421-1 Relay Date Code 20020501
Reference Manual
Section 1: Protection Functions
Table 1.1 ESS := N, Current and Voltage Source Selection............................................................... R.1.2
Table 1.2 ESS := 1, Current and Voltage Source Selection................................................................ R.1.3
Table 1.3 ESS := 2, Current and Voltage Source Selection................................................................ R.1.4
Table 1.4 ESS := 3, Current and Voltage Source Selection................................................................ R.1.5
Table 1.5 ESS := 4, Current and Voltage Source Selection................................................................ R.1.6
Table 1.6 ESS := Y, Tapped Line........................................................................................................ R.1.7
Table 1.7 ESS := Y, Current Polarizing Source.................................................................................. R.1.8
Table 1.8 Frequency Estimation ....................................................................................................... R.1.10
Table 1.9 Frequency Estimation Analog Quantity ........................................................................... R.1.10
Table 1.10 Fault Location Triggering Elements................................................................................. R.1.11
Table 1.11 Fault Type ......................................................................................................................... R.1.12
Table 1.12 Fault Location Settings..................................................................................................... R.1.12
Table 1.13 Fault Location Relay Word Bit......................................................................................... R.1.12
Table 1.14 Open Phase Detection Relay Word Bits ........................................................................... R.1.13
Table 1.15 Pole Open Logic Settings ................................................................................................. R.1.14
Table 1.16 EPO Setting Selections..................................................................................................... R.1.14
Table 1.17 Pole Open Logic Relay Word Bits.................................................................................... R.1.14
Table 1.18 LOP Logic Setting ............................................................................................................ R.1.17
Table 1.19 LOP Logic Relay Word Bits............................................................................................. R.1.17
Table 1.20 FIDS Relay Word Bits ...................................................................................................... R.1.20
Table 1.21 Directional Elements Supervising Ground Distance Elements ........................................ R.1.21
Table 1.22 Ground Directional Element Settings............................................................................... R.1.22
Table 1.23 Ground Directional Element Settings AUTO Calculations.............................................. R.1.22
Table 1.24 Ground Directional Element Enables ............................................................................... R.1.24
Table 1.25 Ground Directional Element Relay Word Bits ................................................................. R.1.26
Table 1.26 Reference Table for Figure 1.15, Figure 1.16, and Figure 1.17....................................... R.1.30
Table 1.27 Phase and Negative-Sequence Directional Elements Relay Word Bits............................ R.1.33
Table 1.28 Zone Directional Settings ................................................................................................. R.1.35
Table 1.29 CVT Transient Detection Logic Setting ........................................................................... R.1.36
Table 1.30 CVT Transient Detection Logic Relay Word Bit ............................................................. R.1.36
Table 1.31 Series-Compensation Line Logic Relay Settings ............................................................. R.1.38
Table 1.32 Load-Encroachment Logic Relay Settings ....................................................................... R.1.40
Table 1.33 Load-Encroachment Logic Relay Word Bits.................................................................... R.1.40
Table 1.34 OOS Logic Relay Settings................................................................................................ R.1.42
Table 1.35 OOS Logic Relay Word Bits ............................................................................................ R.1.43
Table 1.36 Mho Ground Distance Element Settings .......................................................................... R.1.46
Table 1.37 Mho Ground Distance Elements Relay Word Bits ........................................................... R.1.47
Table 1.38 Quadrilateral Ground Distance Element Settings............................................................. R.1.51
Table 1.39 Quadrilateral Ground Distance Elements Relay Word Bits ............................................. R.1.52
Table 1.40 Mho Phase Distance Element Settings ............................................................................. R.1.55
Table 1.41 Mho Phase Distance Elements Relay Word Bits.............................................................. R.1.56
Table 1.42 Zone Delay Settings.......................................................................................................... R.1.59
Table 1.43 Zone Time Delay Relay Word Bits................................................................................... R.1.60
Table 1.44 Phase Overcurrent Element Settings ................................................................................ R.1.62
Table 1.45 Negative-Sequence Overcurrent Element Settings........................................................... R.1.63
Table 1.46 Residual Ground Overcurrent Element Settings .............................................................. R.1.63
Table 1.47 Phase Instantaneous and Definite-Time Line Overcurrent Relay Word Bits ................... R.1.64
Table 1.48 Negative-Sequence Instantaneous
and Definite-Time Line Overcurrent Relay Word Bits ................................................... R.1.64
Table 1.49 Residual Ground Instantaneous and Definite-Time Line Overcurrent Relay Word Bits . R.1.65
Table 1.50 Selectable Current Quantities ........................................................................................... R.1.69
Table 1.51 Selectable Inverse Time-Overcurrent Settings ................................................................. R.1.69
Table 1.52 Selectable Inverse-Time Overcurrent Relay Word Bits.................................................... R.1.70
Table 1.53 SOTF Settings................................................................................................................... R.1.86
Table 1.54 SOTF Relay Word Bits..................................................................................................... R.1.86

xiiiList of Tables
Date Code 20020501 SEL-421/SEL-421-1 Relay
Table 1.55 ECOMM Setting ...............................................................................................................R.1.88
Table 1.56 DCB Settings.....................................................................................................................R.1.91
Table 1.57 DCB Relay Word Bits .......................................................................................................R.1.91
Table 1.58 POTT Settings...................................................................................................................R.1.95
Table 1.59 POTT Relay Word Bits .....................................................................................................R.1.96
Table 1.60 DCUB Settings................................................................................................................R.1.100
Table 1.61 DCUB Relay Word Bits ..................................................................................................R.1.101
Table 1.62 Trip Logic Settings..........................................................................................................R.1.103
Table 1.63 Setting TULO Unlatch Trip Options...............................................................................R.1.105
Table 1.64 Trip Logic Settings..........................................................................................................R.1.106
Table 1.65 Trip Logic Relay Word Bits ............................................................................................R.1.107
Table 1.66 Circuit Breaker Failure Protection Logic Settings ..........................................................R.1.118
Table 1.67 Circuit Breaker Failure Relay Word Bits ........................................................................R.1.119
Section 2: Auto-Reclose and Synchronism Check
Table 2.1 Auto-Reclose Logical States for Circuit Breaker 1.............................................................R.2.4
Table 2.2 One-Circuit-Breaker Three-Pole Reclosing Initial Settings................................................R.2.8
Table 2.3 One-Circuit-Breaker Single-Pole Reclose Initial Settings ..................................................R.2.9
Table 2.4 One Circuit Breaker Modes of Operation ...........................................................................R.2.9
Table 2.5 Dynamic Leader/Follower Settings...................................................................................R.2.17
Table 2.6 Leader/Follower Selection ................................................................................................R.2.18
Table 2.7 Example One: Reset and 79CY3 States ............................................................................R.2.18
Table 2.8 Example One: Lockout State.............................................................................................R.2.19
Table 2.9 Example One: Reset State After Reclaim Time ................................................................R.2.19
Table 2.10 Leader/Follower Selection ................................................................................................R.2.19
Table 2.11 Example Two: Initial Reset State ......................................................................................R.2.20
Table 2.12 Example Two: Final Reset State .......................................................................................R.2.20
Table 2.13 Leader/Follower Selection ................................................................................................R.2.21
Table 2.14 Example Three: Reset State ..............................................................................................R.2.21
Table 2.15 Example Three: Three-Pole Cycle State ...........................................................................R.2.21
Table 2.16 Example Three: Lockout State, BK1 ................................................................................R.2.22
Table 2.17 Leader/Follower Selection ................................................................................................R.2.22
Table 2.18 Two Circuit Breakers: Circuit Breaker BK1 Out of Service.............................................R.2.23
Table 2.19 Two-Circuit-Breaker Three-Pole Reclose Initial Settings ................................................R.2.23
Table 2.20 Two-Circuit-Breaker Single-Pole Reclose Initial Settings................................................R.2.24
Table 2.21 Circuit Breaker BK1 Modes of Operation ........................................................................R.2.24
Table 2.22 Circuit Breaker BK2 Modes of Operation ........................................................................R.2.25
Table 2.23 Trip Logic Enable Options ................................................................................................R.2.26
Table 2.24 Auto-Reclose Logic Settings ...........................................................................................R.2.29
Table 2.25 Auto-Reclose Logic Relay Word Bits...............................................................................R.2.31
Table 2.26 Synchronism-Check Relay Word Bits...............................................................................R.2.45
Section 3: SELOGIC®Control Equation Programming
Table 3.1 Advanced SEL-421 Relay SELOGIC Control Equation Features........................................R.3.2
Table 3.2 SEL-421 Relay SELOGIC Control Equation Programming Summary................................R.3.2
Table 3.3 Summary of SELOGIC Control Equation Elements ..........................................................R.3.11
Table 3.4 First Execution Bit Operation on Power-Up ....................................................................R.3.12
Table 3.5 First Execution Bit Operation on Automation Settings Change .......................................R.3.12
Table 3.6 First Execution Bit Operation on
Protection Settings Change, Group Switch, and Source Selection ..................................R.3.12
Table 3.7 SELOGIC Control Equation Variable Quantities ...............................................................R.3.12
Table 3.8 SELOGIC Control Equation Math Variable Quantities ......................................................R.3.13
Table 3.9 Latch Bit Quantities ..........................................................................................................R.3.14
Table 3.10 Latch Bit Parameters .........................................................................................................R.3.14
Table 3.11 Conditioning Timer Quantities..........................................................................................R.3.16
Table 3.12 Conditioning Timer Parameters ........................................................................................R.3.16
Table 3.13 Sequencing Timer Quantities ............................................................................................R.3.20
Table 3.14 Sequencing Timer Parameters...........................................................................................R.3.20

xiv List of Tables
SEL-421/SEL-421-1 Relay Date Code 20020501
Table 3.15 Counter Quantities ............................................................................................................ R.3.22
Table 3.16 Counter Parameters........................................................................................................... R.3.22
Table 3.17 Operator Precedence from Highest to Lowest.................................................................. R.3.25
Table 3.18 Boolean Operator Summary ............................................................................................. R.3.25
Table 3.19 Parentheses Operation in Boolean Equation .................................................................... R.3.26
Table 3.20 NOT Operator Truth Table ............................................................................................... R.3.26
Table 3.21 AND Operator Truth Table............................................................................................... R.3.26
Table 3.22 OR Operator Truth Table.................................................................................................. R.3.26
Table 3.23 Comparison Operations .................................................................................................... R.3.28
Table 3.24 Math Operator Summary .................................................................................................. R.3.29
Table 3.25 Math Error Examples........................................................................................................ R.3.30
Table 3.26 SEL-311 Series Relays and
SEL-421 Relay SELOGIC Control Equation Programming Features .............................. R.3.36
Table 3.27 SEL-311 Series Relays and
SEL-421 Relay SELOGIC Control Equation Boolean Operators..................................... R.3.36
Section 4: Communications Interfaces
Table 4.1 SEL-421 Relay Communications Protocols ....................................................................... R.4.2
Table 4.2 EIA-232 Pin Assignments .................................................................................................. R.4.4
Table 4.3 Communications Card Database Regions .......................................................................... R.4.6
Section 5: SEL Communications Protocols
Table 5.1 Hardware Handshaking ...................................................................................................... R.5.2
Table 5.2 Supported Serial Command Sets ........................................................................................ R.5.4
Table 5.3 Selected ASCII Control Characters .................................................................................... R.5.5
Table 5.4 Compressed ASCII Commands.......................................................................................... R.5.7
Table 5.5 Fast Commands and Response Descriptions.................................................................... R.5.10
Table 5.6 Fast Operate Command Types.......................................................................................... R.5.10
Table 5.7 Fast Message Command Function Codes
Used With Fast SER (A546 Message) and Relay Response Descriptions...................... R.5.11
Table 5.8 Analog Quantities Included in the Synchrophasor Fast Message .................................... R.5.11
Table 5.9 Fast Message Command Function Codes for Synchrophasor Fast Write ........................ R.5.12
Table 5.10 Commands in Recommended Sequence for Automatic Configuration............................ R.5.13
Table 5.11 Virtual File Structure ........................................................................................................ R.5.14
Table 5.12 Settings Directory Files .................................................................................................... R.5.16
Table 5.13 REPORTS Directory Files................................................................................................ R.5.16
Table 5.14 EVENTS Directory Files (for event 10001)..................................................................... R.5.17
Table 5.15 MIRRORED BITS Communications Features ..................................................................... R.5.18
Table 5.16 General Port Settings Used With MIRRORED BITS Communications............................... R.5.22
Table 5.17 MIRRORED BITS Communications Protocol Settings ....................................................... R.5.23
Table 5.18 MIRRORED BITS Communications Message Transmission Period ................................... R.5.24
Table 5.19 MIRRORED BITS Communications ID Settings for Three-Terminal Application ............. R.5.24
Table 5.20 SEL-2885 Initialization String [MODE PREFIX ADDR:SPEED].................................. R.5.25
Section 6: DNP 3.0 Communications
Table 6.1 DNP 3.0 Implementation Levels ........................................................................................ R.6.2
Table 6.2 Selected DNP 3.0 Function Codes ..................................................................................... R.6.3
Table 6.3 DNP Access Methods ......................................................................................................... R.6.4
Table 6.4 DNP Access Methods ......................................................................................................... R.6.6
Table 6.5 SEL-421 Relay Event Buffer Capacity............................................................................... R.6.8
Table 6.6 SEL-421 Relay Port DNP Protocol Settings ...................................................................... R.6.9
Table 6.7 SEL-421 Relay DNP Map Settings .................................................................................. R.6.10
Table 6.8 SEL-421 Relay DNP 3.0 Device Profile .......................................................................... R.6.13
Table 6.9 SEL-421 Relay DNP Object List...................................................................................... R.6.14
Table 6.10 SEL-421 Relay DNP 3.0 Default Data Map..................................................................... R.6.19
Table 6.11 SEL-421 Relay Object 1, 2 Relay Word Bit Mapping ..................................................... R.6.23
Table 6.12 Object 1, 2 Indices 1600—1615 Front-Panel Targets....................................................... R.6.26
Table 6.13 Object 30, Index 176 Upper Byte—Event Cause............................................................. R.6.26

xvList of Tables
Date Code 20020501 SEL-421/SEL-421-1 Relay
Table 6.14 Object 30, Index 176 Lower Byte—Fault Type................................................................R.6.26
Table 6.15 SEL-421 Relay Object 12 Trip/Close Pair Operation .......................................................R.6.27
Table 6.16 SEL-421 Relay Object 12 Code Selection Operation .......................................................R.6.28
Table 6.17 DNP 3.0 Application Example Data Map.........................................................................R.6.29
Table 6.18 SEL-421 Relay Class D Example Settings .......................................................................R.6.30
Table 6.19 SEL-421 Relay Port 3 Example Settings ..........................................................................R.6.31
Section 7: UCA2 Communications
Table 7.1 UCA2 Layers.......................................................................................................................R.7.2
Table 7.2 GOMSFE Components .......................................................................................................R.7.3
Table 7.3 Components of MMXU$MX$A$PhsAf .............................................................................R.7.3
Table 7.4 GOOSE Bit Pairs.................................................................................................................R.7.4
Table 7.5 SEL-421 Relay GOMSFE Domains ...................................................................................R.7.5
Table 7.6 SEL-421 Relay Virtual Device Domain Models.................................................................R.7.5
Table 7.7 SEL-421 LN0 Domain Models ...........................................................................................R.7.6
Table 7.8 Protection Free-Form Settings ............................................................................................R.7.7
Table 7.9 SEL-421 Relay Port 5 Incoming GOOSE Example Settings..............................................R.7.8
Table 7.10 SEL-421 Relay Outgoing GOOSE Example Output Settings ............................................R.7.8
Table 7.11 SEL-421 Relay Port 5 Outgoing GOOSE Example Settings..............................................R.7.8
Section 8: ASCII Command Reference
Table 8.1 2AC Command....................................................................................................................R.8.2
Table 8.2 AAC Command...................................................................................................................R.8.2
Table 8.3 ACC Command ...................................................................................................................R.8.2
Table 8.4 BAC Command ...................................................................................................................R.8.2
Table 8.5 BNA Command...................................................................................................................R.8.2
Table 8.6 BRE n Command ................................................................................................................R.8.3
Table 8.7 BRE n C and BRE n R Commands.....................................................................................R.8.3
Table 8.8 BRE C A and BRE R A Commands ...................................................................................R.8.3
Table 8.9 BRE n H Command.............................................................................................................R.8.3
Table 8.10 BRE n P Command .............................................................................................................R.8.4
Table 8.11 CAS Command ...................................................................................................................R.8.4
Table 8.12 CBR Command ...................................................................................................................R.8.4
Table 8.13 CBR TERSE Command ......................................................................................................R.8.5
Table 8.14 CEV Command ...................................................................................................................R.8.5
Table 8.15 CEV ACK Command..........................................................................................................R.8.5
Table 8.16 CEV C Command................................................................................................................R.8.6
Table 8.17 CEV L Command................................................................................................................R.8.6
Table 8.18 CEV Lyyy Command ..........................................................................................................R.8.6
Table 8.19 CEV N Command ...............................................................................................................R.8.7
Table 8.20 CEV NSET Command ........................................................................................................R.8.7
Table 8.21 CEV NSUM Command.......................................................................................................R.8.7
Table 8.22 CEV Sx Command ..............................................................................................................R.8.8
Table 8.23 CEV TERSE Command ......................................................................................................R.8.8
Table 8.24 CEV Command Option Groups ..........................................................................................R.8.8
Table 8.25 CHI Command ....................................................................................................................R.8.9
Table 8.26 CHI TERSE Command .......................................................................................................R.8.9
Table 8.27 CLOSE n Command..........................................................................................................R.8.10
Table 8.28 COM c Command .............................................................................................................R.8.10
Table 8.29 COM c C and COM c R Command ..................................................................................R.8.11
Table 8.30 COM c L Command..........................................................................................................R.8.12
Table 8.31 CON nn Command............................................................................................................R.8.12
Table 8.32 COPY Command...............................................................................................................R.8.13
Table 8.33 CSE Command..................................................................................................................R.8.14
Table 8.34 CSE TERSE Command.....................................................................................................R.8.15
Table 8.35 CST Command..................................................................................................................R.8.15
Table 8.36 CSU Command .................................................................................................................R.8.16
Table 8.37 CEV ACK Command........................................................................................................R.8.16

xvi List of Tables
SEL-421/SEL-421-1 Relay Date Code 20020501
Table 8.38 CSU MB Command.......................................................................................................... R.8.16
Table 8.39 CSU N Command............................................................................................................. R.8.16
Table 8.40 CSU TERSE Command.................................................................................................... R.8.17
Table 8.41 DATE Command .............................................................................................................. R.8.17
Table 8.42 DNA Command................................................................................................................ R.8.17
Table 8.43 DNP Command................................................................................................................. R.8.18
Table 8.44 EVE Command................................................................................................................. R.8.18
Table 8.45 EVE A Command............................................................................................................. R.8.18
Table 8.46 EVE ACK Command ....................................................................................................... R.8.19
Table 8.47 EVE C Command ............................................................................................................. R.8.19
Table 8.48 EVE D Command............................................................................................................. R.8.19
Table 8.49 EVE L Command ............................................................................................................. R.8.19
Table 8.50 EVE Lyyy Command........................................................................................................ R.8.20
Table 8.51 EVE N Command............................................................................................................. R.8.20
Table 8.52 EVE NSET Command...................................................................................................... R.8.20
Table 8.53 EVE NSUM Command .................................................................................................... R.8.20
Table 8.54 EVE Sx Command............................................................................................................ R.8.21
Table 8.55 EVE Command Option Groups........................................................................................ R.8.21
Table 8.56 EVE Command Examples ................................................................................................ R.8.21
Table 8.57 FILE Command ................................................................................................................ R.8.22
Table 8.58 GROUP Command ........................................................................................................... R.8.22
Table 8.59 HELP Command............................................................................................................... R.8.23
Table 8.60 HIS Command .................................................................................................................. R.8.23
Table 8.61 HIS C and HIS R Commands ........................................................................................... R.8.23
Table 8.62 HIS CA and HIS RA Commands ..................................................................................... R.8.24
Table 8.63 ID Command .................................................................................................................... R.8.24
Table 8.64 IRIG Command ................................................................................................................ R.8.25
Table 8.65 LOOP Command .............................................................................................................. R.8.26
Table 8.66 LOOP DATA Command................................................................................................... R.8.26
Table 8.67 LOOP R Command .......................................................................................................... R.8.27
Table 8.68 MAP 1 Command............................................................................................................. R.8.27
Table 8.69 MAP 1 Region Command ................................................................................................ R.8.27
Table 8.70 MET Command ................................................................................................................ R.8.28
Table 8.71 MET AMV Command...................................................................................................... R.8.28
Table 8.72 MET ANA Command ...................................................................................................... R.8.29
Table 8.73 MET BAT Command........................................................................................................ R.8.29
Table 8.74 MET D Command ............................................................................................................ R.8.29
Table 8.75 MET E Command............................................................................................................. R.8.30
Table 8.76 MET M Command............................................................................................................ R.8.30
Table 8.77 MET PM Command ......................................................................................................... R.8.31
Table 8.78 MET PMV Command ...................................................................................................... R.8.31
Table 8.79 MET RMS Command....................................................................................................... R.8.31
Table 8.80 MET SYN Command ....................................................................................................... R.8.32
Table 8.81 OAC Command ................................................................................................................ R.8.32
Table 8.82 OPEN n Command ........................................................................................................... R.8.32
Table 8.83 PAC Command ................................................................................................................. R.8.33
Table 8.84 PAS Command.................................................................................................................. R.8.34
Table 8.85 PAS level new_password Command ................................................................................ R.8.34
Table 8.86 PAS level DISABLE Command ....................................................................................... R.8.34
Table 8.87 PORT P Command ........................................................................................................... R.8.35
Table 8.88 PORT Kill n Command .................................................................................................... R.8.35
Table 8.89 PUL OUTnnn Command.................................................................................................. R.8.36
Table 8.90 QUIT Command ............................................................................................................... R.8.36
Table 8.91 SER Command ................................................................................................................. R.8.37
Table 8.92 SER C and SER R Commands ......................................................................................... R.8.37
Table 8.93 SER CA Commands ......................................................................................................... R.8.37
Table 8.94 SER D Command ............................................................................................................. R.8.38
Table 8.95 SET Command Overview................................................................................................. R.8.39

xviiList of Tables
Date Code 20020501 SEL-421/SEL-421-1 Relay
Table 8.96 SET A Command ..............................................................................................................R.8.39
Table 8.97 SET D Command ..............................................................................................................R.8.39
Table 8.98 SET F Command...............................................................................................................R.8.40
Table 8.99 SET G Command ..............................................................................................................R.8.40
Table 8.100 SET L Command...............................................................................................................R.8.40
Table 8.101 SET M Command..............................................................................................................R.8.41
Table 8.102 SET O Command ..............................................................................................................R.8.41
Table 8.103 SET P Command...............................................................................................................R.8.41
Table 8.104 SET R Command ..............................................................................................................R.8.42
Table 8.105 SET TERSE Command Examples ....................................................................................R.8.42
Table 8.106 SHOW Command Overview.............................................................................................R.8.43
Table 8.107 SHOW A Command..........................................................................................................R.8.43
Table 8.108 SHOW D Command..........................................................................................................R.8.43
Table 8.109 SHOW F Command ..........................................................................................................R.8.43
Table 8.110 SHOW G Command..........................................................................................................R.8.44
Table 8.111 SHOW L Command..........................................................................................................R.8.44
Table 8.112 SHOW M Command.........................................................................................................R.8.44
Table 8.113 SHOW O Command..........................................................................................................R.8.44
Table 8.114 SHOW P Command ..........................................................................................................R.8.45
Table 8.115 SHOW R Command..........................................................................................................R.8.45
Table 8.116 SNS Command..................................................................................................................R.8.45
Table 8.117 STA Command..................................................................................................................R.8.46
Table 8.118 STA A Command ..............................................................................................................R.8.46
Table 8.119 STA C and STA R Command............................................................................................R.8.46
Table 8.120 STA S Command...............................................................................................................R.8.47
Table 8.121 STA SC and STA SR Command .......................................................................................R.8.47
Table 8.122 SUM Command.................................................................................................................R.8.47
Table 8.123 SUM ACK Command .......................................................................................................R.8.47
Table 8.124 SUM N Command.............................................................................................................R.8.48
Table 8.125 TAR Command..................................................................................................................R.8.48
Table 8.126 TAR ALL Command.........................................................................................................R.8.48
Table 8.127 TAR R Command..............................................................................................................R.8.49
Table 8.128 TAR X Command..............................................................................................................R.8.49
Table 8.129 TEST DB Command .........................................................................................................R.8.50
Table 8.130 TEST DB OFF Command.................................................................................................R.8.50
Table 8.131 TEST DNP Command.......................................................................................................R.8.50
Table 8.132 TEST DNP Command.......................................................................................................R.8.51
Table 8.133 TEST FM Command.........................................................................................................R.8.51
Table 8.134 TEST FM DEM Command ...............................................................................................R.8.52
Table 8.135 TEST FM OFF Command.................................................................................................R.8.52
Table 8.136 TEST FM PEAK Command .............................................................................................R.8.53
Table 8.137 TIME Command ...............................................................................................................R.8.53
Table 8.138 TIME Q Command............................................................................................................R.8.53
Table 8.139 TRI Command...................................................................................................................R.8.54
Table 8.140 VER Command .................................................................................................................R.8.54
Table 8.141 VIEW 1 Commands–Region.............................................................................................R.8.56
Table 8.142 VIEW 1 Commands–Register Item...................................................................................R.8.56
Table 8.143 VIEW 1 Commands–Bit ...................................................................................................R.8.57
Section 9: Settings
Table 9.1 Global Settings Categories ..................................................................................................R.9.3
Table 9.2 General Global Settings ......................................................................................................R.9.3
Table 9.3 Global Enables ....................................................................................................................R.9.3
Table 9.4 Station DC1 Monitor (and Station DC2 Monitor)...............................................................R.9.4
Table 9.5 Control Inputs (Global) .......................................................................................................R.9.4
Table 9.6 Main Board Control Inputs .................................................................................................R.9.4
Table 9.7 Interface Board #1 Control Inputs.......................................................................................R.9.5
Table 9.8 Interface Board #2 Control Inputs.......................................................................................R.9.5

xviii List of Tables
SEL-421/SEL-421-1 Relay Date Code 20020501
Table 9.9 Settings Group Selection .................................................................................................... R.9.5
Table 9.10 Data Reset Control.............................................................................................................. R.9.6
Table 9.11 Frequency Estimation ......................................................................................................... R.9.6
Table 9.12 Time and Date Management............................................................................................... R.9.6
Table 9.13 Current and Voltage Source Selection ................................................................................ R.9.7
Table 9.14 Breaker Monitor Settings Categories ................................................................................. R.9.8
Table 9.15 Breaker Configuration ........................................................................................................ R.9.8
Table 9.16 Breaker 1 Inputs.................................................................................................................. R.9.8
Table 9.18 Breaker 1 Monitor (and Breaker 2 Monitor) ...................................................................... R.9.9
Table 9.19 Breaker 1 Contact Wear (and Breaker 2 Contact Wear)..................................................... R.9.9
Table 9.17 Breaker 2 Inputs.................................................................................................................. R.9.9
Table 9.20 Breaker 1 Electrical Operating Time (and Breaker 2 Electrical Operating Time) ........... R.9.10
Table 9.21 Breaker 1 Mechanical Operating Time (and Breaker 2 Mechanical Operating Time)..... R.9.10
Table 9.22 Breaker 1 Pole Scatter and Pole Discrepancy
(and Breaker 2 Pole Scatter and Pole Discrepancy)........................................................ R.9.10
Table 9.23 Breaker 1 Inactivity Time Elapsed (and Breaker 2 Inactivity Time Elapsed).................. R.9.10
Table 9.24 Breaker 1 Motor Running Time (and Breaker 2Motor Running Time) ........................... R.9.10
Table 9.25 Breaker 1 Current Interrupted (and Breaker 2 Current Interrupted)................................. R.9.10
Table 9.26 Group Settings Categories ................................................................................................ R.9.11
Table 9.27 Line Configuration ........................................................................................................... R.9.12
Table 9.28 Relay Configuration ......................................................................................................... R.9.12
Table 9.29 Mho Phase Distance Element Reach ................................................................................ R.9.13
Table 9.30 Series Compensation ........................................................................................................ R.9.13
Table 9.31 Mho Phase Distance Element Time Delay ....................................................................... R.9.14
Table 9.32 Mho Ground Distance Element Reach ............................................................................. R.9.14
Table 9.33 Quad Ground Distance Element Reach ............................................................................ R.9.14
Table 9.34 Zero-Sequence Compensation Factor............................................................................... R.9.15
Table 9.35 Ground Distance Element Time Delay............................................................................. R.9.15
Table 9.36 Distance Element Common Time Delay .......................................................................... R.9.16
Table 9.37 Switch-Onto-Fault Scheme............................................................................................... R.9.16
Table 9.38 Out-of-Step Tripping/Blocking......................................................................................... R.9.16
Table 9.39 Load Encroachment.......................................................................................................... R.9.17
Table 9.40 Phase Instantaneous Overcurrent Pickup.......................................................................... R.9.18
Table 9.41 Phase Definite-Time Overcurrent Time Delay ................................................................. R.9.18
Table 9.42 Phase Instantaneous Definite-Time Overcurrent Torque Control .................................... R.9.18
Table 9.43 Residual Ground Instantaneous Overcurrent Pickup........................................................ R.9.18
Table 9.44 Residual Ground Definite-Time Overcurrent Time Delay ............................................... R.9.19
Table 9.45 Residual Ground Instantaneous Definite-Time Overcurrent Torque Control .................. R.9.19
Table 9.46 Negative-Sequence Instantaneous Overcurrent Pickup.................................................... R.9.19
Table 9.47 Negative-Sequence Definite-Time Overcurrent Time Delay ........................................... R.9.19
Table 9.48 Negative-Sequence Instantaneous Definite-Time Overcurrent Torque Control............... R.9.19
Table 9.49 Selectable Operating Quantity Inverse Time Overcurrent Element 1 .............................. R.9.20
Table 9.50 Selectable Operating Quantity Inverse Time Overcurrent Element 2 .............................. R.9.20
Table 9.51 Selectable Operating Quantity Inverse Time Overcurrent Element 3 .............................. R.9.21
Table 9.52 Zone/Level Direction........................................................................................................ R.9.21
Table 9.53 Directional Control Element............................................................................................. R.9.21
Table 9.54 Pole Open Detection......................................................................................................... R.9.22
Table 9.55 POTT Trip Scheme........................................................................................................... R.9.22
Table 9.56 DCUB Trip Scheme.......................................................................................................... R.9.22
Table 9.57 DCB Trip Scheme............................................................................................................. R.9.23
Table 9.58 Breaker 1 Failure Logic (and Breaker 2 Failure Logic) ................................................... R.9.23
Table 9.59 Synchronism Check Element Reference .......................................................................... R.9.24
Table 9.60 Breaker 1 Synchronism Check ......................................................................................... R.9.24
Table 9.61 Breaker 2 Synchronism Check ......................................................................................... R.9.25
Table 9.62 Recloser and Manual Closing ......................................................................................... R.9.25
Table 9.63 Single-Pole Reclose Settings ............................................................................................ R.9.26
Table 9.64 Three-Pole Reclose Settings............................................................................................. R.9.26
Table 9.65 Voltage Elements .............................................................................................................. R.9.27

xixList of Tables
Date Code 20020501 SEL-421/SEL-421-1 Relay
Table 9.66 Demand Metering..............................................................................................................R.9.27
Table 9.67 Trip Logic..........................................................................................................................R.9.27
Table 9.68 Protection Free-Form SELOGIC Control Equations ..........................................................R.9.29
Table 9.69 Output Settings Categories................................................................................................R.9.31
Table 9.70 Main Board........................................................................................................................R.9.31
Table 9.71 Interface Board #1.............................................................................................................R.9.31
Table 9.72 Interface Board #2.............................................................................................................R.9.31
Table 9.73 Communications Card Outputs .........................................................................................R.9.32
Table 9.74 MIRRORED BITS Transmit Equations ................................................................................R.9.32
Table 9.75 Front-Panel Settings Categories ........................................................................................R.9.33
Table 9.76 Front Panel Settings ..........................................................................................................R.9.33
Table 9.77 Selectable Screens for the Front Panel..............................................................................R.9.35
Table 9.78 Display Points and Aliases................................................................................................R.9.35
Table 9.79 Local Control and Aliases.................................................................................................R.9.35
Table 9.80 Report Settings Categories ................................................................................................R.9.36
Table 9.81 SER Chatter Criteria..........................................................................................................R.9.36
Table 9.82 SER Points and Aliases .....................................................................................................R.9.36
Table 9.83 Event Reporting.................................................................................................................R.9.36
Table 9.84 Event Reporting Digital Elements.....................................................................................R.9.37
Table 9.85 Port Settings Categories ....................................................................................................R.9.38
Table 9.86 Protocol Selection .............................................................................................................R.9.38
Table 9.87 Communications Settings..................................................................................................R.9.38
Table 9.88 SEL Protocol Settings .......................................................................................................R.9.38
Table 9.89 Synchronized Phasor Measurement Settings ....................................................................R.9.39
Table 9.90 DNP 3.0 Protocol Settings ................................................................................................R.9.39
Table 9.91 MIRRORED BITS Protocol Settings ....................................................................................R.9.40
Table 9.92 Ethernet Settings ...............................................................................................................R.9.41
Table 9.93 FTP Settings ......................................................................................................................R.9.41
Table 9.94 Telnet Settings ...................................................................................................................R.9.41
Table 9.95 Network Host Name..........................................................................................................R.9.42
Table 9.96 UCA Settings.....................................................................................................................R.9.42
Table 9.97 DNP 3.0 Settings Categories.............................................................................................R.9.43
Table 9.98 DNP 3.0 Object Default Map Enables ..............................................................................R.9.43
Table 9.99 Binary Input Map ..............................................................................................................R.9.43
Table 9.100 Binary Output Map............................................................................................................R.9.43
Table 9.101 Counter Map......................................................................................................................R.9.43
Table 9.102 Analog Input Map .............................................................................................................R.9.44
Table 9.103 Analog Output Map...........................................................................................................R.9.44
Appendix A: Relay Word Bits
Table A.1 Alphabetic List of Relay Word Bits ..................................................................................R.A.2
Table A.2 Relay Word Bits: Enable and Tripping ............................................................................R.A.19
Table A.3 Relay Word Bits: Distance Elements ...............................................................................R.A.19
Table A.4 Relay Word Bits: Series Compensated Line Logic ..........................................................R.A.22
Table A.5 Relay Word Bits: Out-of-Step Elements ..........................................................................R.A.22
Table A.6 Relay Word Bits: Directional Elements ...........................................................................R.A.23
Table A.7 Relay Word Bits: Overcurrent Elements..........................................................................R.A.24
Table A.8 Relay Word Bits: Synchronism-Check Elements.............................................................R.A.25
Table A.9 Relay Word Bits: Reclosing Elements .............................................................................R.A.26
Table A.10 Relay Word Bits: Miscellaneous Elements ......................................................................R.A.28
Table A.11 Relay Word Bits: Trip Logic Elements ............................................................................R.A.28
Table A.12 Relay Word Bits: Pilot Tripping Elements.......................................................................R.A.29
Table A.13 Relay Word Bits: Circuit Breaker 1 Failure .....................................................................R.A.30
Table A.14 Relay Word Bits: Circuit Breaker 2 Failure Elements .....................................................R.A.32
Table A.15 Relay Word Bits: Circuit Breaker Status and Open Phase Detector ................................R.A.33
Table A.16 Relay Word Bits: Reserved Category Elements...............................................................R.A.34
Table A.17 Relay Word Bits: Circuit Breaker Monitor ......................................................................R.A.35
Table A.18 Relay Word Bits: Reserved Category...............................................................................R.A.36

xx List of Tables
SEL-421/SEL-421-1 Relay Date Code 20020501
Table A.19 Relay Word Bits: DC Supply Monitor............................................................................. R.A.37
Table A.20 Relay Word Bits: Metering Elements.............................................................................. R.A.37
Table A.21 Relay Word Bits: Open and Close Command ................................................................. R.A.37
Table A.22 Relay Word Bits: Local Bits ............................................................................................ R.A.38
Table A.23 Relay Word Bits: Remote Bits......................................................................................... R.A.38
Table A.24 Relay Word Bits: Active Protection Settings Group ....................................................... R.A.39
Table A.25 Relay Word Bits: Input Elements .................................................................................... R.A.40
Table A.26 Relay Word Bits: Protection Variables ............................................................................ R.A.41
Table A.27 Relay Word Bits: Protection Latches............................................................................... R.A.43
Table A.28 Relay Word Bits: Protection Conditioning Timers.......................................................... R.A.44
Table A.29 Relay Word Bits: Protection Sequencing Timers ............................................................ R.A.44
Table A.30 Relay Word Bits: Protection Counters............................................................................. R.A.46
Table A.31 Relay Word Bits: Automation Variables.......................................................................... R.A.47
Table A.32 Relay Word Bits: Automation Latches ............................................................................ R.A.54
Table A.33 Relay Word Bits: Automation Sequencing Timers.......................................................... R.A.55
Table A.34 Relay Word Bits: Automation Counters .......................................................................... R.A.57
Table A.35 Relay Word Bits: SELOGIC Control Equation Error and Status ...................................... R.A.58
Table A.36 Relay Word Bits: Relay Alarms ...................................................................................... R.A.59
Table A.37 Relay Word Bits: Reserved Category.............................................................................. R.A.60
Table A.38 Relay Word Bits: Time and Date Elements ..................................................................... R.A.63
Table A.39 Relay Word Bits: Output Elements.................................................................................. R.A.64
Table A.40 Relay Word Bits: Pushbutton Elements........................................................................... R.A.65
Table A.41 Relay Word Bits: Data Reset Bits.................................................................................... R.A.66
Table A.42 Relay Word Bits: Target Logic Bits................................................................................. R.A.66
Table A.43 Relay Word Bits: MIRRORED BITS................................................................................... R.A.67
Table A.44 Relay Word Bits: Test Bits............................................................................................... R.A.68
Table A.45 Relay Word Bits: Communications Card Input Points.................................................... R.A.69
Table A.46 Relay Word Bits: Communications Card Output Points ................................................. R.A.70
Table A.47 Relay Word Bits: Communications Card Status Points................................................... R.A.71
Table A.48 Relay Word Bits: Fast SER Enable Bits .......................................................................... R.A.72
Table A.49 Relay Word Bits: Source Selection Elements.................................................................. R.A.72
Appendix B: Analog Quantities
Table B.1 Analog Quantities Sorted By Function ............................................................................. R.B.2
Table B.2 Analog Quantities Sorted Alphabetically .......................................................................... R.B.7
Appendix C: GOMSFE Tables
Table C.1 GOMSFE Model Table Column Definitions..................................................................... R.C.2
Table C.2 SEL-421 Relay Domains ................................................................................................... R.C.3
Table C.3 Models in LN0 Domain ..................................................................................................... R.C.4
Table C.4 Device ID Model (DI)—LN0 Domain .............................................................................. R.C.4
Table C.5 GCTL Model (GCTL)—LN0 Domain .............................................................................. R.C.5
Table C.6 Globe Model (GLOBE)—LN0 Domain ........................................................................... R.C.5
Table C.7 Models in Virtual Device Domain for SEL-421 Relays.................................................... R.C.9
Table C.8 Device ID Model (DI)—SEL-421 Relay Domain............................................................. R.C.9
Table C.9 Fault Identification Model (FAULT1—FAULT20)—SEL-421 Relay Domain .............. R.C.10
Table C.10 GCTL Model (GCTL)—SEL-421 Relay Domain........................................................... R.C.10
Table C.11 Globe Model (GLOBE)—SEL-421 Relay Domain .........................................................R.C.11
Table C.12 Polyphase Meter Unit Model (MMTR)—SEL-421 Relay Domain ................................ R.C.15
Table C.13 Polyphase Measurement Unit Model (MMXU)—SEL-421 Relay Domain ................... R.C.15
Table C.14 Circuit Breaker Control and Status Model
(XCBR1—XCBR2)—SEL-421 Relay Domain........................................................... R.C.16
Table C.15 Special Translation Rules ................................................................................................ R.C.17
Table C.16 SEL-421 Relay Target Bit Mapping ................................................................................ R.C.18
Table C.17 Event Types ..................................................................................................................... R.C.18
Table C.18 Common Fault Types....................................................................................................... R.C.19