In order to reduce the power cut off which caused by electric shock accident and earth-fault power cut off, it must install residualcurrentoperated protective device.
This paper introduces the parameter selection, installation, grounding mode of low-voltage power grid and construction method of residualcurrentoperated protective device.
文中详细论述了剩余电流动作保护装置的参数选用，安装要求，低压电网接地方式及安装施工要求等。
3
The classification of failure and its distribution of DZL118 series residualcurrentoperated protective device were introduced, the causes of failure were analyzed.