介绍了煤矿井下低压漏电保护从附加直流电源漏电保护到选择性漏电保护使用过渡中出现的问题,从单相接地故障电流的分布特点、零序功率方向保护原理、中性点不接地方式下中性点对地电流Ion分析了出现拒动、误动现象原因,并针对性地提出解决办法。 This paper introduces the problems that occur during the transition from the additional DC power source leakage protection to the selective leakage protection using the distribution characteristics of the single-phase ground fault current, the zero-sequence power direction protection principle, the neutral point ungrounded The point-to-ground current Ion analyzes the causes of refusing to move and misoperation, and puts forward the solutions in a targeted manner.