Series arc fault distance measurement method

The invention provides a series arc fault distance measurement method, and the method comprises the steps: constructing a function relation analysis formula between the amplitude of a current signal of an upstream monitoring point and the amplitude of a voltage signal of a downstream monitoring point and a fault distance only through the amplitude information of the current signal of the upstream monitoring point and the amplitude of the voltage signal of the downstream monitoring point; the invention further provides a double-end signal acquisition method based on the double-end signal period matching strategy, and the signals are acquired if the similarity between the self-differential waveforms of the signals at the two ends and the square waves is high through comparison between the self-differential waveforms of the signals at the two ends and the square waves. The method is low in cost, high in practicability, high in stability and high in reliability. 本发明提供一种串联电弧故障测距方法，仅利用了上游监测点电流与下游监测点电压两个信号的幅值信息，构建了上