井下中央变电所选择性保护接地的实现及意义

Application of the Selected Ground Protection and Its Significance for Underground Center Substation

通过对老式高压隔爆配电装置装设零序电流互感器、零序电压互感器的改造,利用零序电压或零序电流的幅值大小判断供电单元是否发生了漏电,同时利用各支路零序电压或零序电流的相位关系来判断故障支路,然后动作,实现其选择性。

Reform old high voltage explosion partition (separate) distribution equipment to set zero sequence current mutual inductor, zero sequence voltage mutual inductor, judge leakage of electricity from power supply unit depending on the amplitude of zero sequence voltage and zero sequence current while judge default by-pass utilized phase position relation of by-pass zero sequence voltage and zero sequence current by-pass, then operating to come true choice.