Single-phase earth fault line selection method based on post-fault wave correlation analysis

The invention relates to a single-phase earth fault line selection method based on post-fault wave correlation analysis, which relates to the electric system's power distribution field. The method comprises: accurately capturing the three-phase and zero-sequence current and the data of two sampling periods of the voltage signal after the fault through the measuring terminals installed on the lines; determining whether the two waveforms are similar or not through the solution of the correlation coefficient of the data of the same signal in two sampling periods; through the correlation coefficient calculation module, solving the correlation coefficients of the six pairs of waveforms respectively and comparing the correlation coefficients with the set value; if the number of the lines goes beyond the set number, then, determining that a single-phase earth fault takes place on the lines. According to the invention, the method is not influenced by the operation manners of the neural points. The method can be perfo