Single-phase grounding fault line selection method for distribution network with same bus loop based on cluster

Abstract

This paper proposes a fault line selection method using zero-sequence current waveform clustering for distribution network with same bus loop which has a high reliability for single-phase grounding faults. The purpose is to improve the adaptability of fault detection method for different line structure and fault conditions. Firstly, a single-phase grounding fault composite sequence (module) network for distribution network with same bus loop is established. It is used to analyze the zero-sequence current waveform difference between fault line/fault loop and healthy line during fault transient time. Furthermore, a fault line selection method using zero-sequence current waveform clustering is proposed. This method can be applied to low and high impedance grounding faults on a single outgoing line, the loop with the same bus, and the bus line. It has a strong applicability and improves the reliability of single-phase grounding fault line selection for resonant grounding systems. Simulation data verify the correctness of the method.