Identification method for single-line-to-ground fault with line breaks in medium-voltage distribution networks

被引：0
|
作者：
Li Z.-C. [1 ]
Liu Y.-D. [1 ]
Yan Y.-J. [1 ]
Wang P. [2 ]
Jiang X.-C. [1 ]
机构：
[1] School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai
[2] Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2022年 / 26卷 / 02期
关键词：
Distribution network; Distribution transformer; Fault diagnosis; Single-line-to-ground fault; Single-line-to-ground fault with line break; Symmetrical component method;
D O I：
10.15938/j.emc.2022.02.005
中图分类号：
学科分类号：
摘要：
In view of high concealment of single-line-to-ground fault with line break (SLGF-LB) and difficulty in identifying it in small-current grounding distribution networks, to effectively distinguish SLGF-LB, the symmetrical component method is used to analyze the electrical characteristics of SLGF-LB and single-line-to-ground fault (SLGF) on the low-voltage side of the distribution transformer. Then an identification method for SLGF-LB based on electrical characteristics on the low-voltage side in small-current grounding medium-voltage distribution networks is proposed. This method was based on the low-voltage side three-phase voltage amplitude, and SLGF-LB and SLGF can be distinguished by the average value of the amplitude. The three-phase voltage amplitudes were used to detect the phase of the broken line for SLGF-LB. The identification method is not affected by network parameters such as grounding resistance and neutral point grounding method and length of distribution lines. Then, the errors of influencing factors such as measurement devices, voltage harmonic distortion and distributed energy resources were analyzed, and the identification method proposed above was corrected. The results of simulation experiments show that the method can accurately detect SLGF-LB and identify fault phase under any operating condition of small-current grounding distribution networks. © 2022, Harbin University of Science and Technology Publication. All right reserved.
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页码：43 / 53
页数：10
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