谐波在煤矿选择性漏电保护中的应用研究

Application of Harmonics on Mine Selective Leakage Protection

目前煤矿供电系统中,适用于中性点经消弧线圈接地的选择性漏电保护较少,针对该现状,文章在研究供电系统谐波理论的基础上,提出了应用五次谐波判断故障线路的理论。通过分析得出,故障线路与非故障线路中五次谐波电流方向相反且幅值最大,该结论可用于选择性漏电保护中。

At present there are few selective leakage protection applicable to the mine power system which neutral point is grounded by arc suppression coil. Aiming at this situation, based of the study of power system harmonies, the theory of application fifth harmonic on leakage protection was put forward. By analysis, compare to the fifth harmonics current in non - faulty line, the current in faulty line is in the opposite direction and is the maximum value. This conclusion can be used in selective leakage protection.