Abstract: Due to the mismatch of power supply system，improper selection of electrical equipment matching with leakage protector and the reasons of the protected electrical equipment itself，the leakage protector will cause misoperation or refusal of action.In this paper，the common faults of leakage protection devices in engineering practice are described in detail，the causes of the faults are analyzed and the safe and effective solutions are given.

Key words: zero phase current transformer, malfunction, refusal action

摘要： 漏电保护器因供电系统不匹配、与漏电保护器配套的电气设备选择不当以及被保护的电气设备本身的原因都会造成发生误动作或者拒动作。文中就工程实践中漏电保护装置常见故障,详尽地描述故障现像,分析找到了故障发生的原因并给出了安全有效的解决方法。

关键词: 零序电流互感器, 误动作, 拒动作