煤矿井下直流架线电网漏电保护的研究

DC TROLLEY WIRE NETWORK LEAKAGE PROTECTIONS IN UNDERGROUND MINES

为防止煤矿井下直流架线电网触电死亡事故发生,笔者研制了漏电保护装置,其原理是利用本质上有别于工作电源(直流电源250～550 V)的中频交流电源作检测电源,连续监视架线电网的漏电情况,当人体触电或架线电网绝缘严重下降时,短时间内即可切断直流电源,以保护人身安全。

To prevent the fatal accidents resulted from electric shock by DC trolley wire network in underground mines,the authors developed a leakage protection device.Its principle is to use the medium frequency AC supply,which is intrinsically different from the DC working supply at 250～550 V for continuous monitoring of leakage of the network.It can cuts off the DC supply to ensure safety of workers in case an electric shock takes place,or when the insulation of trolley wire greatly reduces.