A new method of single-phase grounding fault protection for a resonant grounding distribution network based on unbalanced overvoltage dynamic suppression

被引：0
|
作者：
Liu Z. [1 ]
Zeng X. [1 ]
Yu K. [1 ]
Liu S. [1 ]
Li L. [1 ]
Xu P. [1 ]
机构：
[1] School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2021年 / 49卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Fault line selection; Fault phase selection; Phase-to-ground fault perception; Three-phase imbalance;
D O I：
10.19783/j.cnki.pspc.200630
中图分类号：
学科分类号：
摘要：
The existing single-phase grounding fault protection method for distribution network cannot be reliably started when a high resistance grounding fault occurs. The results of fault phase selection and fault line selection are greatly affected by three-phase imbalance. To solve the above problem, a new method of single-phase grounding fault protection for a resonant grounding distribution network based on unbalanced overvoltage dynamic suppression is proposed. Based on the dynamic suppression of a three-phase unbalanced overvoltage, the characteristics of injection current and feeder zero sequence current before and after the phase-to-ground fault are analyzed. Given the characteristics of the injection current variation, the dynamic perception criterion of grounding fault is constructed. The fault phase selection and the transition resistance calculation are carried out by adopting the phase and root-mean-square value of the variation respectively and the fault line selection is carried out by comparing the amplitude of the zero-sequence current variation for each feeder. The PSCAD/EMTDC simulation results show that the proposed method can be started accurately for a high resistance ground fault, and the results of phase selection and line selection are not affected by the three-phase imbalance and the capacitance to ground. © 2021 Power System Protection and Control Press.
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页码：41 / 49
页数：8
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