A Hierarchical Model Based Corrosion Diagnosis Approach for Grounding Grid with Down Lead Lines

LIU Jian1; NI Yun-feng1; WANG Shu-qi1; WANG Jian-xin1; LI Zhi-zhong2; WANG Sen2

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A Hierarchical Model Based Corrosion Diagnosis Approach for Grounding Grid with Down Lead Lines

更新时间：2025-04-26

- A Hierarchical Model Based Corrosion Diagnosis Approach for Grounding Grid with Down Lead Lines
- High VoltageApparatus Vol. 45, Issue 2, Pages: 31-35(2009)
- 作者机构：
  
  1. 西安科技大学通信与信息工程学院
  2. 陕西电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM862
- Published：2009
- 稿件说明：
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[1]刘健,倪云峰,王树奇,王建新,李志忠,王森.一种基于分层约简模型的含接地引下线的接地网故障诊断方法[J].高压电器,2009,45(02):31-35.

LIU Jian1, NI Yun-feng1, WANG Shu-qi1, et al. A Hierarchical Model Based Corrosion Diagnosis Approach for Grounding Grid with Down Lead Lines[J]. High voltageapparatus, 2009, 45(2): 31-35.
[1]刘健,倪云峰,王树奇,王建新,李志忠,王森.一种基于分层约简模型的含接地引下线的接地网故障诊断方法[J].高压电器,2009,45(02):31-35. DOI：

LIU Jian1, NI Yun-feng1, WANG Shu-qi1, et al. A Hierarchical Model Based Corrosion Diagnosis Approach for Grounding Grid with Down Lead Lines[J]. High voltageapparatus, 2009, 45(2): 31-35. DOI：

摘要

为了对接地网水平支路导体和接地引下线的腐蚀情况进行诊断

提出了一种新颖的故障诊断方法。建立了接地网的分层约简模型并得到所有节点都可及的本征接地网。采用蒙特卡罗方法分析了接地网的可测性

将支路分为电阻可以唯一确定的明晰支路和电阻不能唯一确定的不确定支路两类。建议了一种判断测试充分性的方法

指出在充分测试条件下

本征接地网中所有支路的电阻都可以唯一确定。分析了接地引下线电阻对接地网故障诊断的影响

提出了一种根据本征接地网支路电阻的诊断结果对接地引下线进行腐蚀故障诊断的方法

并指出所有接地引下线的电阻都可以唯一确定。在一个60支路的实验接地网上进行了实验验证

接地网明晰支路电阻和接地引下线电阻的最大相对诊断误差分别为4.86%和8.43%

表明所提出的方法是可行的

并且可以较好地诊断出接地网明晰支路和接地引下线的腐蚀状况。

Abstract

To diagnose the corrosion condition of the horizontal conductors and the down lead lines of a grounding grid

a novel approach is presented.A hierarchical model of grounding grid is established

and an intrinsic grounding grid with only accessible nodes is hence achieved based on the model.The testability of the grounding grid is analyzed with Monte-Carlo method.As a result

the branches are divided into clear branches and uncertain branches.The resistances of the clear branches can be exactly determined while the resistances of the uncertain branches can not.A method to judge the sufficiency of test is suggested

and it is pointed out that in sufficient test the resistances of branches in the intrinsic grounding grid can all be exactly determined.The influence of down lead lines on corrosion diagnosis results is analyzed

and an approach to evaluate the resistances of down lead lines based on the diagnosis results of intrinsic grounding grid is proposed.It is believed that the resistances of all down lead lines can be exactly determined.An experimental grounding grid with sixty branches is adopted to verify the proposed approach.The results show that the maximum relative errors of the resistances are 4.86% for the clear branches and 8.43% for the down lead lines

respectively

which demonstrates that the proposed approach can be used to examine corrosion condition of the horizontal conductors and the down lead lines.

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