Abstract
Abstract The purpose of this paper is to provide a hierarchical and active fault location method in neutral point non-effectively grounded loop distribution network. It analyzes the distribution of loop closing zero-sequence current with single-phase grounding (SPG) fault occurring in two different topologies. According to the variations characteristics of steady loop closing zero-sequence current, fault section can be determined. Then precise SPG fault position can be got using Discrete Wavelet Transform (DWT) and Support Vector Machine (SVM) technology. Even if the fault point cant be located at the first time, the method can still work by repeating the process till the accurate fault position is located. More than 115,200 study cases are simulated on the simulation platform built on PSCAD/EMTP. The results indicate that the proposed fault location method is effective and robust for neutral point non-effectively grounded loop distribution network.
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