Cross-line Different-phase Two-point Successive Grounding Fault Detection Based on Change of Zero-sequence Admittance

被引：0

作者：

Xue Y. ^{[1
]}

Qi Z. ^{[1
]}

Cai Z. ^{[1
]}

Zhang Z. ^{[1
]}

Wang C. ^{[2
]}

Xu B. ^{[2
]}

机构：

[1] College of New Energy, China University of Petroleum (East China), Qingdao

[2] Research Center for Smart Grid, Shandong University of Technology, Zibo

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2023年 / 47卷 / 07期

基金：

中国国家自然科学基金;

关键词：

cross-line fault; different-phase two-point successive grounding fault; fault detection; non-solidly grounded system; zero-sequence admittance;

D O I：

10.7500/AEPS20220504004

中图分类号：

学科分类号：

摘要：

The fault detection technology of common single-phase grounding fault in non-solidly grounded system has gradually matured, but the characteristics and detection methods for some special grounding faults still need further study. In this paper, the equivalent circuit model is established for the cross-line different-phase two-point successive grounding fault in the non-grounded system and the resonant grounded system, and the electrical characteristics of the fault path and the non-fault path before and after the grounding fault are analyzed. The analysis shows that the zero-sequence admittance of the non-fault path remains unchanged, but under the condition that the transition resistance of the two grounding points is less than 3 000 Ω, there is a significant difference in at least one of the module values or phase angles of the zero-sequence admittance of the fault path. Based on this, a method for detecting the later fault of the cross-line different-phase two-point successive grounding faults in non-solidly grounded system based on the change of zero-sequence admittance is proposed, which can further realize the later fault line selection and location. Based on digital simulation and actual fault data, the correctness of fault feature analysis and the feasibility of detection method are verified. © 2023 Automation of Electric Power Systems Press. All rights reserved.

引用

页码：174 / 183

页数：9

共 23 条

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