Troubleshooting and Analysis of Anti-trip Circuit of 110 kV Circuit Breakers
This paper focuses on an event of fault-induced trip encountered by a 110 kV line in an actual 220 kV substa-tion.It reports the maintenance processes performed for fault diagnosis,including relay's action information inspection,fault recording inspection,monitoring information inspection,secondary circuit inspection,component test,anti-trip relay test,etc.,and describes the finally determined fault cause,i.e.,a mismatch between parameters of anti-trip relay and op-eration box plug-ins which resulted in unreliable action of the relay.It also puts forward the solution to provide a basis for future analysis of similar faults.
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