Fault line selection method of grounding fault with high resistance in resonant grounding system based on intensive zero-sequence impedance characteristics

被引：0
|
作者：
Shao W. [1 ]
Liu Y. [1 ]
Cheng Y. [1 ,2 ]
Zhang Z. [3 ]
Cheng C. [1 ]
机构：
[1] School of Electronics and Information, Xi'an Polytechnic University, Xi'an
[2] School of Electrical Engineering, Xi'an University of Technology, Xi'an
[3] Electric Power Research Institute of State Grid Shaanxi Electric Power Company, Xi'an
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2021年 / 41卷 / 11期
关键词：
Distribution network; Fault line selection; Grounding fault with high resistance; Parallel resistance; Zero-sequence impe-dance;
D O I：
10.16081/j.epae.202107028
中图分类号：
学科分类号：
摘要：
In order to solve the difficulties of faulty line selection of grounding fault with high resistance in resonant grounding system of distribution network, it is proposed to enhance the zero-sequence impedance characteristics of the line by using the short-time switching of resistance connected in parallel with arc suppression coil. In the case of single-phase grounding fault, the zero-sequence impedance characteristics of the healthy and faulty lines on the same bus before and after switching the parallel resistance are analyzed. The analysis shows that the zero-sequence impedance of any healthy line remains unchanged before and after switching the parallel resistance, which is composed of its own capacitance impedance to ground, while the zero-sequence impedance of the faulty line decreases significantly after the parallel resistance is put into operation, which is composed of the parallel equivalent resistance of all the healthy lines, arc suppression coil branch and the parallel resistance branch. In addition, the range of parallel resistance is analyzed by considering the limiting requirements of fault current and the start-up requirements of zero-sequence voltage. Therefore, according to the change characteristics of zero-sequence impedance of the faulty line before and after switching the parallel resistance, an improved faulty line selection method is proposed, which can theoretically adapt to the grounding fault with high resistance that lower than 3 000 Ω. The effectiveness of the proposed method is verified by MATLAB simulation. © 2021, Electric Power Automation Equipment Press. All right reserved.
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页码：120 / 126
页数：6
相关论文
共 19 条
  • [1] JIANG Jian, BAO Guanghai, Survey of the methods to select fault line in neutral point ineffectively grounded power system, Electrical Engineering, 16, 12, pp. 1-5, (2015)
  • [2] LIU Yugen, WANG Jiannan, MI Hongwei, Et al., Optimization research on neutral grounding mode of 10 kV distribution networks, High Voltage Engineering, 41, 10, pp. 3355-3362, (2015)
  • [3] WEI Lishan, JIA Wenchao, JIAO Yanjun, Fault line selection scheme in small current grounding system based on admittance asymmetry principle, Electric Power Automation Equipment, 40, 3, pp. 162-167, (2020)
  • [4] LI Tianyou, XU Bingyin, XUE Yongduan, High-impedance fault protection of distribution networks and its developments, Distribution & Utilization, 35, 5, pp. 2-6, (2018)
  • [5] HE Ruijiang, HU Zhijian, WANG Tianyi, A fault line selection method for resonant grounding system considering injected harmonics of distributed generation, Power System Techno-logy, 43, 2, pp. 670-677, (2019)
  • [6] ZHU Ke, WANG Yixuan, NI Jian, Application of active disturbance technology in faulty line selection of arc suppression coil grounding system, Electric Power Automation Equipment, 37, 10, pp. 189-196, (2017)
  • [7] LI Yilin, YIN Xianggen, CHEN Rui, New method for transient line selection in distribution system based on grounding fault transferred, The Journal of Engineering, 16, 5, pp. 2822-2826, (2019)
  • [8] TANG Tao, HUANG Chun, JIANG Yaqun, Et al., A method of fault line selection in resonant earthed system based on zero sequence impedance characteristic of lines, Transactions of China Electrotechnical Society, 31, 20, pp. 192-201, (2016)
  • [9] GAO Jie, CHENG Qiming, CHENG Yinman, Et al., Faulty line selection method based on quantum genetic bistable system for distribution network, Electric Power Automation Equipment, 38, 5, pp. 164-170, (2018)
  • [10] GUO Moufa, GAO Yuan, YANG Gengjie, Faulty line detection based on transient waveform difference recognition for resonant earthed system, Electric Power Automation Equipment, 34, 5, pp. 59-66, (2014)
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