126 kV断路器触头烧蚀故障分析及措施

在运行条件下处于高电位的瓷柱式断路器灭弧室内部触头承载对应回路电流,其触头接触状况决定着断路器通流状态下是否存在发热现象。本文通过动作过程波形分析,现场解体检查,理论计算及仿真,对一起126 kV断路器触头烧蚀故障进行分析,明确了故障机理及烧蚀原因。对同批次断路器开展隐患排查,验证了该型断路器更换机构后试验不到位带来的隐患,并制定相应管控措施,避免因断路器内部触头接触不良引发故障。

Analysis of contact erosion failure of 126 kV circuit breaker and research on the countermeasures

Under the operation condition, the contact in arcextinguishing chamber of the highpotential porcelain post circuit breaker carries the corresponding circuit current, and the contacting condition of the contact determines whether there is heat in the throughflow status of the circuit breaker. In this paper, a 126 kV circuit breaker contact erosion fault was analyzed through the action process waveform analysis, onsite disassembly inspection, theoretical calculation and simulation, and the failure mechanism and erosion reasons were clarified. The hidden dangers of the same batch of circuit breakers were investigated to verify the hidden dangers caused by the failure of the test after the replacement mechanism of the circuit breaker, and the corresponding control measures were formulated to avoid the failure caused by the failure of the internal contact of the circuit breaker.