Research on Distribution Network Single-Phase To-Ground Faulty Line Detection

The thesis is based on summing up the features of high voltage grounding grip single-phase to-ground process to analyze the characteristics of zero sequence current, zero sequence voltage, voltage phase mode transformation and current phase mode transformation. It provides solution to pick out single-phase to-ground faulty lines at the exit of converting stations by waveform recognition in the principle that voltage transformer injects signal to interfere zero sequence current, and the integrated faulty line detection that consists of waveform recognition, wavelet analysis and energy analysis, and it introduces the single-phase to-ground faulty line detection in small current earthed system.