ZN65A-12型真空断路器拒分原因分析与处理

Analysis and Treatment of the Fail-to-break of ZN65A-12 Type Vacuum Circuit Breaker

断路器拒分故障的后果是极其严重的,文中针对ZN65A-12型手车式真空断路器在安装调试及投运初期所频繁出现的拒分故障,对其外部控制系统、内部电气控制回路和机构传动部分进行了全面的分析研究,查明引起该批次断路器拒分的根本原因为真空断路器机构的初始分闸力矩过小,并采取了调整主轴拐臂角度的有效改进措施,保证了其分闸的可靠性,彻底消除了真空断路器拒分的重大安全隐患。

The fail-to-break of circuit breaker is extremely serious to the power system. Considering frequently occurred fail-to-break, a comprehensive analysis on the external control system, internal electrical circuits and transmission mechanism of the ZN65A-12 hand trolley vacuum circuit breaker is introduced. The testing result shows that the initial opening moments of the vacuum circuit breaker mechanism is much less than normal, and it leads to the fail-to-break of circuit breaker. By adjusting the angle of the spindle moment arm, the switching off reliability of the vacuum circuit breaker is effectively improved, and then the serious potential safety hazard is eliminated.