Research on fault location of low voltage distribution network with small current grounding based on wavelet analysis

Most of the 3-66KV medium voltage distribution networks in China are grounded through arc suppression coil. In order to improve the accuracy of fault location, this paper constructs a fault line selection scheme based on the modulus maximum singularity detection principle of wavelet transform for the characteristics of a large number of high-frequency feature information in the transient process of single-phase grounding fault of small current grounding system. The simulation analysis of typical faults shows that the fault line selection method proposed in this paper can quickly and accurately select fault lines.