煤矿掘进工作面供电系统选择性漏电保护的实现

Achievement of selective leakage protection system in underground tunneling face power supply networks

针对煤矿井下掘进工作面供电系统无选择性漏电保护的问题 ,根据实际需要 ,提出了基于附加直流电源和零序电流方向检测的选择性漏电保护方案。在原有保护的基础上 ,设计了零序电压检测电路和中断信号发生器 ,配合我厂生产的分支馈电开关 ,可有效地完成掘进工作面供电系统两级漏电保护功能。

On the basis of analyzing the causes being short of selection leakage protection in underground tunneling face networks,a selection leakage protective scheme based on additional DC measurement and zero sequence current direction judgement is presented in this paper.A detecting circuit of zero sequence voltage and generator of interrupt control signal is also designed with which the latitudinal and longitudinal selective leakage protection can be effectively achieved combined with sub feeding gears switch produced by Hongke Electrical Apparatus Factory.