Line selection method for grounding fault in resonant grounding distribution systems

被引：0
|
作者：
Long R. [1 ]
Huang C. [1 ]
Tang T. [1 ]
Zeng J. [1 ]
机构：
[1] School of Electrical and Information Engineering, Hunan University, Changsha
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2019年 / 47卷 / 21期
基金：
中国国家自然科学基金;
关键词：
Distribution network; Faulty line selection; Feeder; Resonant grounding system; Single-phase grounding fault;
D O I：
10.19783/j.cnki.pspc.181495
中图分类号：
学科分类号：
摘要：
To solve the problem of low accuracy of line selection when grounding fault occurs in a small current grounding system, a new method for single-phase grounding fault line selection in resonant grounding system is proposed. By analyzing the characteristics of zero-sequence current and zero-sequence impedance of different lines, it is found that the zero-sequence impedance of the healthy line is always capacitive, and the zero-sequence current is the pure capacitive current. But the zero-sequence current of the faulty line contains the inductive component of the arc-suppression coil in the low frequency band, and the amplitude is greater than that in the high frequency band. Firstly, the low-pass filter is used to extract the signal component of the bus zero-sequence voltage and the zero-sequence current of each feeder in the low frequency band, and the bus zero-sequence voltage is derived. Then it compares the difference between the product of the zero-sequence current and the pure capacitive current of any two lines. The one which has largest difference is the fault line. Simulations of single-phase ground fault under different working conditions have been done. The results show that the method is accurate and adaptive. © 2019, Power System Protection and Control Press. All right reserved.
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页码：21 / 29
页数：8
相关论文
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