接地网故障诊断中测量节点对选取方法分析  

Analysis on the method of selecting nodes on the erosion diagnosis of grounding grid

作　　者：刘渝根[1] 孟宪 田金虎[1] 王硕[3] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]重庆电力科学试验研究院,重庆400015 [3]北京市电力公司,北京100031

出　　处：《重庆大学学报（自然科学版）》2010年第1期73-77,共5页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(59677016)

摘　　要：针对实际变电站中地网接地引下线偏少导致接地网腐蚀诊断分析时的欠定方程数量有限而影响诊断精度的问题,将特勒跟定理的接地网腐蚀诊断方法和灵敏度分析法相结合,并计算分析接地网支路电阻值变化对小跨距、大跨距、地网边缘、地网中心、地网对称交叉线情况下的端口电阻值的影响,提出了一种适用于工程实际的变电站接地网故障诊断中测量节点对选取方法。仿真分析和现场试验诊断结果表明:该方法有效提高了接地网腐蚀诊断的精度及腐蚀诊断过程中故障支路判断的速度。The number of underdetermined equation, which is limited by the grounding down lines, reduces the grounding grid corrosion diagnostic precision. Based on the grounding grid fault diagnosis method and sensitivity analysis, the value of slip resistance change on the impact of the port resistance in several cases, such as small span, large span and edge, center and symmetrical cross-line of the grounding grid, is analyzed. A new method which is used to select the node pairs to calculate the corrosion situation of grounding grid is presented. Based on this method, the simulation analysis and field test has been done. The experimental results show that this method could improve the accuracy and efficiency of grounding grid fault diagnosis.

关 键 词：灵敏度 变电站 故障支路 接地网 故障诊断 

分 类 号：TM862[电气工程—高电压与绝缘技术]