基于电磁场原理和地表电位的接地网腐蚀诊断研究  

Research on Grounding Grid Corrosion Diagnosis Based on Electromagnetic Field Theory and Earth Surface Potential

作　　者：褚旭 余绍帅 严亚兵 李辉 CHU Xu;YU Shaoshuai;YAN Yabing;LI Hui(National Electric Power Conversion and Control Engineering Technology Research Center,Changsha 410082,China;Hunan University,Changsha 410082,China;State Grid Hunan Electric Power Company Limited Research Institute,Changsha 410208,China)

机构地区：[1]国家电能变换与控制工程技术研究中心,湖南长沙410082 [2]湖南大学,湖南长沙410082 [3]国网湖南省电力有限公司电力科学研究院,湖南长沙410208

出　　处：《湖南电力》2023年第4期118-124,共7页Hunan Electric Power

基　　金：国家自然科学基金项目(51807053);国网湖南省电力有限公司科技项目(5216A5220022、5216A5210036、5216A522000N)。

摘　　要：变电站接地网因规模大、结构复杂、强电磁干扰的特点,在进行腐蚀诊断时会存在检测困难、误差较大的问题。针对这些问题,提出基于电磁场原理(electromagnetic field theory,EFT)和地表电位(earth surface potential,ESP)相结合的方法进行接地网腐蚀导体部位诊断,从而弥补在强磁干扰下EFT方法测量精度差的缺陷。该方法首先分析在EFT基础上腐蚀导体的磁感应强度分布,接着分析腐蚀导体的ESP分布,将磁感应强度曲线和ESP分布曲线进行结合,最后确定导体腐蚀位置和类型。经测试,该方法所得到的腐蚀导体位置与设置的腐蚀导体位置一致,验证了该方法诊断腐蚀导体的精确性。Because of its large scale,complex structure and strong electromagnetic interference,the grounding grid of the substation has the problems of difficult detection and large error in corrosion diagnosis.Aiming at these problems,this article proposes a method based on the combination of electromagnetic field theory(EFT)and earth surface potential(ESP)to diagnose the corrosion conductor of grounding grid,so as to make up for the defect of poor measurement accuracy of EFT method under strong magnetic interference.This method first analyzes the magnetic induction intensity distribution of the corroded conductor on the basis of EFT.Then the paper analyzes the ESP distribution of the corroded conductor,combines the magnetic induction intensity curve with the ESP distribution curve,and finally determines the location and type of conductor corrosion.The test shows that the position of the corroded conductor obtained by this method is consistent with the position of the set corroded conductor,which shows the accuracy of the method in diagnosing the corroded conductor.

关 键 词：接地网腐蚀 电磁场原理 腐蚀诊断 地表电位 

分 类 号：TM862.3[电气工程—高电压与绝缘技术]