Sel SEL-421 - Page 4

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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