Detection of High Impedance Grounding Fault in Distribution Network Based on Interval Slope Curves of Zero-sequence Current

被引：0
|
作者：
Wei M. [1 ]
Shi F. [1 ]
Zhang H. [1 ]
Xu B. [2 ]
Wang P. [3 ]
机构：
[1] Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Shandong University, Jinan
[2] College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo
[3] Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2020年 / 44卷 / 14期
基金：
国家重点研发计划;
关键词：
Distribution network; Grubbs method; High impedance grounding fault; Least square method; Waveform distortion;
D O I：
10.7500/AEPS20190801009
中图分类号：
学科分类号：
摘要：
High impedance grounding fault in the distribution network can hardly be detected and cleared by the traditional protective relays due to its weak fault current. The persistent existence of the fault increases the risks of fire hazards and human safety. Aiming at the problems of hard-determined setting threshold and insufficient detection reliability caused by the differences of fault characteristics and noise interference when the existing methods are facing different grounding dielectrics and fault scenarios, a fault detection method is proposed based on interval slope curves of zero sequence current according to the curve analysis of high impedance fault field test in a 10 kV power grid, which uses least squares linear fitting to describe the nonlinear distortion of curves. Meanwhile, Grubbs method is proposed to suppress the interference to interval slopes curves from the irregular waveform distortions and to further guarantee the proper extraction of the fault characteristics. The proposed method possesses strong immunity against noise and the reliability is verified by numerical simulation and field measured fault data. © 2020 Automation of Electric Power Systems Press.
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收藏
页码：164 / 171
页数：7
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