Comparison of Substation Grounding Grid Fault Diagnosis Results Using Surface Potential and Magnetic Induction Intensity

WANG Fenghua; WANG Shaojing; LIU Yadong; HUANG Ronghui; ZHANG Hongzhao

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Comparison of Substation Grounding Grid Fault Diagnosis Results Using Surface Potential and Magnetic Induction Intensity

更新时间：2025-12-08

- Comparison of Substation Grounding Grid Fault Diagnosis Results Using Surface Potential and Magnetic Induction Intensity
- Vol. 42, Issue 7, Pages: 2281-2289(2016)
- 作者机构：
  
  1. 上海交通大学电力传输与功率变换控制教育部重点实验室
  2. 深圳供电局有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 July 2016，
  
  Published：2016
- 稿件说明：
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WANG Fenghua, WANG Shaojing, LIU Yadong, et al. Comparison of Substation Grounding Grid Fault Diagnosis Results Using Surface Potential and Magnetic Induction Intensity[J]. 2016, 42(7): 2281-2289.
DOI：

WANG Fenghua, WANG Shaojing, LIU Yadong, et al. Comparison of Substation Grounding Grid Fault Diagnosis Results Using Surface Potential and Magnetic Induction Intensity[J]. 2016, 42(7): 2281-2289. DOI：

摘要

为有效提高变电站接地网导体故障诊断的准确性

以某35 k V变电站为依托

基于量纲相似原理设计和定制了不规则形状的接地网模型

根据接地网模型的地表电位和地表磁感应强度的计算结果

通过模拟典型故障

对采用地表电位和磁感应强度诊断接地网典型故障的测试结果进行了对比

总结了接地网典型故障时地表电位和磁感应强度的变化规律

据此提出了基于灰色关联理论的接地网状态评价指标。结果表明

接地网导体节点处电位较高

网孔上方地表电位略低;导体上方磁感应强度较高

且激励电流注入点处的地表磁感应强度最大;所提出的接地网导体健全度评价指标可准确判断接地网故障类型和故障位置。

Abstract

To improve accuracy of fault diagnosis of substation grounding grid

we have designed and customized a random form grounding grid model of a 35 k V substation based on dimensional similarity principle. According to the calculation results of the surface potential and magnetic induction intensity of the grounding grid

the test results of typical faults diagnosis of grounding grid based on surface potential and magnetic induction intensity are compared by simulating typical faults. The change rules of surface potential and magnetic induction intensity when grounding grid has typical faults are also summarized. A judging rule of grounding grid state is proposed based on the grey relational degree theory according to the change rules. The results show that the surface potential of conductors’ nodes is higher

and the surface potential of mesh is lower. The magnetic induction intensity is larger

and the magnetic induction intensity of the current injection point is the largest. The proposed judging rule can be used to diagnose the grounding grid’s fault type and location accurately.

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