湖南电力 ›› 2020, Vol. 40 ›› Issue (4): 51-54.doi: 10.3969/j.issn.1008-0198.2020.04.012

• 故障与分析 • 上一篇    下一篇

一起线路高阻接地故障引起的主变越级跳闸事故分析

尹超勇, 徐浩, 许立强, 李辉   

  1. 国网湖南省电力有限公司电力科学研究院,湖南 长沙 410007
  • 收稿日期:2020-04-21 出版日期:2020-08-25 发布日期:2020-09-30
  • 作者简介:尹超勇(1993),男,硕士,工程师,主要研究方向为电力系统继电保护与控制技术。徐浩(1987),男,博士,工程师,主要研究方向为电力系统继电保护与控制技术、特高压直流输电技术。

Analysis on Over Tripping Accident of Main Transformer Caused by a Line High Resistance Grounding Fault

YIN Chaoyong, XU Hao, XU Liqiang, LI Hui   

  1. State Grid Hunan Electric Power Company Limited Research Institute, Changsha 410007,China
  • Received:2020-04-21 Online:2020-08-25 Published:2020-09-30

摘要: 线路发生高阻接地故障时,由于故障特征不明显,难以实现单端电气量的保护装置全线可靠速动,甚至可能无法识别出故障。文中介绍了一起110 kV 线路单相高阻接地故障,对故障后相关线路、主变压器的保护动作进行了详细分析,指出了故障原因,得出了非稳定性和稳定性高阻接地故障时保护装置都可能拒动,其选择性、灵敏性都难以满足要求的结论。

关键词: 高阻接地, 距离保护, 零序保护, 越级跳闸

Abstract: When the high resistance ground fault occurs in the line, the fault characteristics are not obvious. At present, it is difficult for the protection device with single terminal electric quantity to realize the reliable and quick operation of the wholeline, and identify the fault.This paper introduces a single-phase high resistance grounding fault of 110 kV transmission line, analyzes the protection action of relevant lines and main transformer after the fault, points out the fault cause. It draws a conclusion that when the high resistance grounding fault is unstable and stable, protection devices may be refused to move, and its selectivity and sensitivity is difficult to meet the requirements.

Key words: high resistance grounding, distance protection, zero sequence protection, override trip

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