Grounding Fault Detection Method Of Intelligent Distribution Network Under Power Marketing Informatization

Distribution network lines generally have long distances, many branches, complex equipment and diverse geographical conditions. Once a grounding fault occurs, the fault point search time is long, and there is a certain false alarm. In view of this problem, an intelligent distribution network grounding fault detection method under power marketing informatization is proposed. The steady-state and transient fault characteristics and different detection methods after single-phase grounding are analyzed. Recent emerging detection methods, namely, the comparative zero sequence current waveform method, zero sequence voltage conduction time domain method and wide area synchronous transient recording method, are compared. The results show that the transient characteristic method can detect various grounding faults with relatively high accuracy and convenient implementation. The application effect of the transient characteristic method in the Daqing Oilfield is ideal. The accuracy of short-circuit and overcurrent fault location is more than 95%, and the accuracy of permanent ground fault detection is more than 75%, which greatly improves the accuracy of ground fault detection and enhances the reliability of the power grid.