Schweitzer Engineering Laboratories SEL-351 - Section 13: Testing and Troubleshooting

Date Code 20001006 Testing and Troubleshooting i
SEL-351 Instruction Manual
TABLE OF CONTENTS
SECTION 13: TESTING AND TROUBLESHOOTING .......................... 13-1
Introduction................................................................................................................................ 13-1
Testing Philosophy..................................................................................................................... 13-1
Acceptance Testing ............................................................................................................ 13-1
Commissioning Testing...................................................................................................... 13-1
Maintenance Testing .......................................................................................................... 13-2
Testing Methods and Tools........................................................................................................ 13-3
Test Features Provided by the Relay.................................................................................. 13-3
Low-Level Test Interface ................................................................................................... 13-3
Delta-Connected Voltages.......................................................................................... 13-4
Sensitive Earth Fault (SEF) Channel IN (0.05 A Nominal)....................................... 13-4
Test Methods...................................................................................................................... 13-4
Testing Via Front-Panel Indicators............................................................................. 13-5
Testing Via Output Contacts ...................................................................................... 13-5
Testing Via Sequential Events Recorder.................................................................... 13-5
Relay Self-Tests ......................................................................................................................... 13-6
Relay Troubleshooting............................................................................................................... 13-8
Inspection Procedure.......................................................................................................... 13-8
Troubleshooting Procedure ................................................................................................ 13-9
All Front-Panel LEDs Dark........................................................................................ 13-9
Cannot See Characters on Relay LCD Screen............................................................ 13-9
Relay Does Not Respond to Commands From Device Connected to Serial Port ...... 13-9
Relay Does Not Respond to Faults............................................................................. 13-9
Relay Calibration........................................................................................................................ 13-9
Factory Assistance.................................................................................................................... 13-10
TABLES
Table 13.1: Relay Self-Tests ................................................................................................................. 13-6
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