基于CDEGS的变电站接地网缺陷诊断研究  

Research on Defect Diagnosis of Substation Grounding Grid Based on CDEGS

作　　者：张文龙 鲁志伟[1] 苏侃 宣科 张毅 ZHANG Wenlong;LU Zhiwei;SU Kan;XUAN Ke;ZHANG Yi(Electrical Engineering College,Northeast Electric Power University,Jilin 132012,China;Operation,Maintenance and Repair Department,Eastern Power Supply Branch of Development Zone,Dalian Power Supply Company,State Grid Liaoning Electric Power Co.,Ltd.,Dalian 116600,China;State Grid State Grid Harbin Power Supply Company,Harbin 150010,China)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012 [2]国网辽宁省电力有限公司大连供电公司开发区东部供电分公司运维检修部,辽宁大连116600 [3]国网国网哈尔滨供电公司,哈尔滨150010

出　　处：《电瓷避雷器》2020年第6期22-28,35,共8页Insulators and Surge Arresters

摘　　要：由于变电站接地网规模较大,结构复杂而且站内存在很大的电磁干扰,因此在变电站接地网的缺陷诊断中往往出现检测困难,诊断误差较大的问题。笔者通过利用CDEGS软件仿真变电站接地网在存在腐蚀或断裂时其导体上方地表电位分布,提出了不需开挖接地网来区分断点与腐蚀的诊断方法并且实现了断点的准确定位和腐蚀区域的判断。结合欧氏距离相关理论,对接地网导体缺陷特征进行了数值化分析。研究了施加激励的幅值与频率对缺陷诊断的影响,选择合适的激励电流从而实现了缺陷信息的放大。Due to the large scale of the substation grounding grid,the complicated structure and the large electromagnetic interference in the station,the problem of detection difficulty and diagnostic error often occurs in the defect diagnosis of the substation grounding grid. By using CDEGS software to simulate the ground potential distribution of the substation grounding grid in the presence of corrosion or fracture,a diagnostic method for distinguishing breakpoints and corrosion without excavating the grounding grid is proposed and the accurate location of the breakpoint and the corrosion area are realized. Combined with the Euclidean distance correlation theory,the characteristics of the grounding grid conductor defects are numerically analyzed. The influence of the amplitude and frequency of the applied excitation on the defect diagnosis is studied,and the appropriate excitation current is selected to achieve the amplification of the defect information.

关 键 词：变电站 接地网 缺陷诊断 地表电位 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM63