一起低压综合配电箱短路事故的分析

Analysis of a Short-Circuit Accident for Low-Voltage Integrated Distribution Box

针对一起低压综合配电箱投入运行时发生的短路事故,对该事故进行了理论分析、计算和现场验证,发现是因加工切屑在断路器投运震动时移位造成短路事故,且由于未在断路器的进线端铜排之间安装隔弧板从而导致事故扩大,并从生产制造、安装前检查、安装后须进行绝缘测试等方面提出了预防措施。

Aiming at a short-circuit accident happened during low-voltage integrated distribution box running, this paper analyzed the accident theoretically and carried out calculation and onsite examine, fi nding that when the process chipping, the shift of circuit breakers running shaking caused the short-circuit accident. Because there was non anti-arc board installed between copper bars of inlet wire end of circuit breakers, the accident enlarged. This paper proposed some preventive measures from the aspects of production manufacturing, examine before installation, insulation testing after installation etc.