Single-phase earth fault positioning detection signal injection method of power distribution network system

The invention discloses a power distribution network system single-phase earth fault positioning detection signal injection method, which is applied to the power distribution network system single-phase earth fault positioning detection signal injection method and comprises the following steps of: analyzing the distributed capacitance and inductance of a power distribution line; the current and frequency of the distribution network single-phase earth fault positioning detection signal are determined according to the relation between the capacitance current and the size and frequency of the injection signal and various factors influencing the current, frequency and transmission of the injection signal, so that the purpose that the current and frequency of the low-current signal source can change along with the grid structure of the distribution line is achieved. And a reliable detection source is provided for distribution network single-phase earth fault positioning and searching. 本发明公开了一种配电网系统单相接地故障定位检测信号注入方法