Auxiliary Judgment Method of Single Phase Grounding Fault in Distribution Network Based on Distribution Automation System

doi:10.3969/j.issn.1008-0198.2022.05.015

Abstract

Abstract: Aiming at the problems of high cost, low line selection efficiency and low success rate of grounding line selection device in distribution network, based on the steady state zero sequence quantity of distribution automation master station system, a grounding fault auxiliary judgment module based on zero sequence impedance comparison and historical data reference is developed. Firstly, the electrical characteristics of 10 kV distribution network under single phase grounding fault are analyzed in detail, and a grounding line selection method is obtained according to the principle of zero sequence impedance comparison. Secondly, through the statistics of historical grounding data, the probability of grounding fault in distribution network lines is calculated, and the historical fault quantity, important degree mark quantity and zero sequence current are weighted by entropy method, so as to form an auxiliary judgment module of single phase grounding fault in distribution network relying on distribution automation system. Finally, the case analysis shows that this module has high accuracy in line selection.

Key words: distribution network, fault line selection, transient zero sequence, entropy weight method

CLC Number:

TM773

LUO Xuelian, CHEN Chenggong, LIU Zhihao, ZENG Huanyue. Auxiliary Judgment Method of Single Phase Grounding Fault in Distribution Network Based on Distribution Automation System[J]. Hunan Electric Power, 2022, 42(5): 85-89.

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