某500 kV组合电器断路器分闸不到位故障发现及分析

Analysis on Opening Failure of A 500 kV GIS Breaker

介绍了一起500 kV组合电器断路器分闸不到位的故障。通过SF 6分解产物测试发现其内部没有击穿现象发生,而X光检测发现该断路器在机械显示分闸的情况下实际处于合闸状态。后对该故障断路器进行返厂解体,发现连接断路器主传动杆的连接臂金属断裂。通过对连接臂金属的各种检测分析(包括成分分析、金相及显微分析、断口分析)结果以及对连接臂金属臂断裂部分的外观检查,综合分析认为由加工工艺质量缺陷产生连接臂连接孔位置的凸楞是造成本次缺陷的根本原因。

An opening failure of a 500 kV GIS breaker is introduced.Through testing SF 6 decomposition products,no discharge breakdown is found in the breaker.Through X-ray detection,it is found that the breaker is actually in opening status.The metal fracture is found in the inner connecting arm after the disassembly of the faulted breaker.Based on the various metal tests of the connecting arm and the visual inspection of the fracture position,the corrugations in the connecting hole due to the manufacturing defects is the root cause for the opening failure of the breaker through comprehensive analysis.