500kV断路器失灵保护误动作跳闸故障分析

Trip Fault Analysis on Maloperation of 500 kV Breaker Failure Protection

针对500 kV断路器失灵保护误动作问题,从故障时刻断路器状态及继电器触点直阻等方面进行分析,认为启动失灵继电器背板触点接触不良是导致故障的原因,提出使用更为可靠的备用触点的处理措施,并通过回路传动试验,验证了断路器启动失灵继电器正确动作,确保失灵保护装置平稳运行。

In view of the malfunction of the 500 kV circuit breaker failure protection, the analysis is carried out from the aspects of the circuit breaker state at the time of the failure and the direct resistance of the relay contact. It is considered that the poor contact of the backplane contact of the start failure relay is the cause of the failure, and the use of a more reliable backup contact is proposed. The corrective actions of the circuit breaker start failure relay have been verified through the circuit transmission test and the smooth operation of the failure protection device.