煤矿井下直流架线电网漏电保护的研究

Research on the Earth-leakage Protection Installation for D.C Trolley Networks of Underground Coal Mines

本文叙述了煤矿井下直流架线电网漏电保护的原理及应用。利用本质上有别于工作电源（直流电压）的交流检测电源来连续监视架线电网的漏电情况。对于２５０～５５０Ｖ电网，当漏电电流有效值达到危险值时，即动作跳闸，有效地防止了触电伤亡事故。

This paper describes the principle of th principle of the earth-leakage protection installation and its application to the D.C. trolley networks of underground coal mines.The installation can continuously monitor the current leakage in trolley networks by making use of the A.C.detection power source which is intrinsically different from the operating power,.In the networks of250～550V set up the installation,as the leaked current reaches the hazardous value,a tripwill be carried out to avoid the electric shock fatality effectively.