Protection method for high-impedance grounding fault in neutral isolated system based on comparative phase analysis of fault phase voltage and zero-sequence current

被引：0
|
作者：
Wang, Pengwei [1 ]
Xu, Bingyin [1 ,2 ]
Wang, Chao [2 ]
Chen, Heng [1 ,2 ]
机构：
[1] School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo
[2] Shandong Kehui Electric Power Automation Co.，Ltd., Zibo
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2024年 / 44卷 / 10期
关键词：
forest fire prevention; grounding fault protection; high-impedance grounding fault; medium-voltage distribution network; tree contact single grounding fault;
D O I：
10.16081/j.epae.202408015
中图分类号：
学科分类号：
摘要：
To mitigate the risk of forest fire caused by power line fault，the grounding fault protection of medium voltage distribution network must reliably detect grounding fault with transition resistances up to 12 kΩ. The 10 kV medium voltage distribution system traversing forested area predominantly employ neutral isolated mode. The existing protection methods rely on zero-sequence voltage to detect the fault direc‑ tion，with a transient resistance capacity not exceeding 6 kΩ，which is inadequate for forest fire prevention. Accordingly，a protection method for high-impedance grounding fault in neutral isolated system based on comparative phase analysis of fault phase voltage and zero-sequence current is proposed as backup protection for high-impedance grounding fault. Analysis of the equivalent circuit for high-impedance grounding fault in neutral isolated system reveals that within the dead zone of existing protections，the fault phase voltage is approximately in-phase with the zero-sequence current of fault line and approximately anti-phase with the zero-sequence current of healthy line. Using the fault phase voltage as a polarizing quantity，a pro‑ tection method is devised to determine the fault direction based on the phase relationship between the fault phase voltage and zero-sequence current. Compared to the existing methods，the transient resistance ca‑ pability of the proposed method is enhanced from 6 kΩ to 12 kΩ. The proposed method can reliably de‑ tect tree contact single-phase-to-ground fault，and advance the protection capability to within the safety margin for forest fire prevention. The effectiveness of the proposed method is validated through digital simulation and field manual test. © 2024 Electric Power Automation Equipment Press. All rights reserved.
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页码：148 / 156
页数：8
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