Fault Location Method Based on Full Waveform Information for Distribution Networks

Abstract

To improve the reliability and sensitivity of fault location in distribution networks, a fault location method based on full waveform information is presented. In this method, the acting features of arc suppression coil and the influence of arc suppression coils parameters on zero sequence voltage and zero sequence current are considered. For grounding faults, the maximum point of the cross-correlation function of the zero sequence voltage of buses and the zero sequence current on each outgoing line is used to select the faulty line, and then the standardized deviation degree of the zero sequence current waveforms when the fault occurs and the corresponding arc suppression coil operates is used to localize the fault. For interphase faults, the three-phase current information before the relay protection device acts is measured to select the faulty line, and then by using standardized deviation degree of the faulty phase current waveforms, the fault is localized. Through the simulations on PSCAD/EMTDC software, the feasibility and reliability of the proposed method are verified.