Automatic Processing of Single-phase Grounding Fault in Distribution Network Based on Fault Phase Grounding

被引：0
|
作者：
Liu J. [1 ,2 ]
Zhang Z. [1 ,2 ]
Li Y. [2 ]
Rui J. [3 ]
机构：
[1] School of Automation and Information Engineering, Xi'an University of Technology, Xi'an
[2] State Grid Shaanxi Electric Power Research Institute, Xi'an
[3] Anhui Onesky Electric Technology Company Limited, Hefei
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2020年 / 44卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Arc extinction; Distribution network; Fault-phase grounding; Neutral point non-effective grounding; Service restoration; Single-phase grounding fault isolation; Single-phase grounding fault line selection; Single-phase grounding fault location;
D O I：
10.7500/AEPS20190730008
中图分类号：
学科分类号：
摘要：
To solve the problem of single-phase grounding fault processing for neutral point non-effective grounding in distribution network, an automatic processing scheme for single-phase grounding faults in distribution network based on fault-phase grounding approach is proposed. The automation system consists of a fault-phase grounding arc-extinguishing line selection device in the substation and fault-phase grounding start-up protection devices deployed to the feeder switches. By adopting the fault-phase grounding method to achieve the reliable arc-extinguishing of single-phase grounding faults, the characteristics of zero-sequence voltage and zero-sequence current variations before and after the fault-phase grounding disconnection are used to achieve the line selection, location and isolation of permanent single-phase grounding fault and power restoration of sound district. By analyzing the variations of zero-sequence voltage and zero-sequence current of the system before and after the fault-phase grounding disconnection, a single-phase grounding line selection and location criterion based on the fundamental zero-sequence current ratio before and after the fault-phase grounding disconnection is constructed. The key technical problems, such as the start-up criterion for single-phase grounding fault processing, the detecting of the fault-phase grounding disconnection moment, and the necessity of throwing in a resistance to the neutral point before the fault-phase grounding disconnection are discussed in detail. Combined with an example, the proposed processing process for single-phase grounding fault is explained and experimental verification is carried out. The results show the feasibility and effectiveness of the proposed method. © 2020 Automation of Electric Power Systems Press.
引用
收藏
页码：169 / 177
页数：8
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