Power distribution network single-phase earth fault active arc extinguishing method

The invention discloses a power distribution network single-phase earth fault active arc extinguishing method, which comprises the steps of sampling a three-phase power supply voltage and a neutral point voltage, and judging whether a single-phase earth fault occurs or not; and when a single-phase earth fault occurs, closing a switch K of a station transformer power supply corresponding to the fault phase in the arc extinguishing device, wherein a single-phase inverter and the station transformer power supply are simultaneously switched on to enable the voltage of a fault point to be 0, and active arc extinguishing of the single-phase earth fault of the power distribution network is completed. The method has the advantages of being real-time, low in production cost, simple in calculation and high in precision under different fault resistances, control parameters and operation conditions. 本发明公开了一种配电网单相接地故障有源消弧方法，对三相电源电压和中性点电压进行采样，判断是否发生单相接地故障；当发生单相接地故障时，闭合消弧装置中故障相对应站用变电源的开关K，单相逆变器和站用变电源同时投入使故障点电压为0，完成配电网单相接地故障