两起同型号单断口330 kV GIS断路器击穿故障分析

Analysis on circuit breakers breakdown failures of 330 kV GIS with single-break of the same type for two cases

以两起同型号单断口330kVGIS断路器击穿故障为例,结合返厂解体、电场仿真、工艺模拟试验、绝缘裕度验证试验等,对其产生原因进行分析,并提出相应的防范措施。结果表明:单断口结构在无异物的情况下可正常运行,绝缘裕度符合要求,两次击穿故障主要是断路器内存在异物,需从装配至现场安装全过程管控。

The two breakdown faults of single - break 330 kV GIS circuit breaker with the same type were taken as an example,combining with the disintegration,electric field simulation,process simulation test and insulation margin verification test, the causes were analyzed and corresponding preventive measures were presented. The results show that the single - break structure can operate normally without foreign particles,and the insulation margin meets the requirements. The two breakdown faults were mainly caused by foreign particles in the circuit breaker,which need to be controlled from assembly to site installation.