The Research of Small Current Single Phase to Earth Fault Selection Method Based on Wavelet Packet Decomposition Coefficient

摘要

The characteristics of the fault line and the non-fault line's zero sequence transient current and zero sequence voltage's are analyzed when the small current grounding system is out of order. A fault line selection method based on the wavelet packet decomposition coefficient is proposed in this paper. The simulation results analyzed by MATLAB verify the effectiveness of the method.