一起油流继电器重瓦斯误动事故分析

Analysis of An Accident Caused by Heavy Gas Misoperation of Oil-flow Relay

文中结合一起有载分接开关油流继电器重瓦斯保护误动导致220 kV变压器跳闸事故展开分析。通过对油流继电器干簧管的绝缘电阻测试、试验,结合现场检查、试验情况和故障录波对事故动作逻辑进行反复推演分析,找到了油流继电器干簧管的设计缺陷及事故诱因,并提出合理的整改建议。

A 220 kV transformer tripping accident caused by heavy gas misoperation of oil-flow relay in on-load tap-changer(OLTC)is analyzed.Through the test and examination of the insulation resistance of reed switch in oil-flow relay and combined with the fault recording wave,the accident action logic is repeatedly deduced and analyzed.The root causes of the accident and a design defect of reed switch in oil-flow relay are found out,and some reasonable suggestions are put forward.