Single-phase Earth Fault Section Location Based on Differences’ Characteristics of Zero-sequence Currents in Distribution Network

Abstract

When a single phase earth fault occurs in distribution network, the difference between the transient zero-sequence currents at the head of the non-faulty section before the fault point is small, and the non-faulty section after the fault point also has this feature, but the difference between the zero-sequence currents at the head of the section before and after the fault point is big. Based on this, a method for comparing the single-phase grounding fault section location in distribution network based on the difference of the transient zero-sequence current was proposed. Based on the known distribution network structure, the fault section table was compiled, then the transient zero-sequence currents difference at the head of each section were compared, the fault section could be selected. The simulation by PSCAD/EMTDC verified the reliability of the method.