摘要
漏电保护装置种类繁多，其性能的好坏与很多因素有关．从对保护装置的基本要来出发，对现有漏电保护装置的工作原理和性能，进行了详细的分析与比较，区分出了有使用价值的保护原理和应用前景不大的保护原理．
There are many kinds of the leakage protective devices. The goodness and badness of its function have relations with many factors. By basic requirements to the protective device, the working principle and function of now available leakage protective device are analysed and compared. By way of the summary,the protective principle of useful value and useless value are distinguished.
关键词
中性点绝缘系统
漏电
单相接地
保护原理
煤矿
neutral-point insulation system, leakage of electricity, single-phase grounding, protective principle
