接地引下线偏移对接地网故障诊断的影响  

Influence of Grounding Down Line Deviation on Fault Diagnosis of Grounding Grid

作　　者：饶章权[1] 刘渝根[2] 李谦[1] 杨楚明[1] 张英[1] 付客勤 肖磊石[2] 刘小二[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]重庆大学电气工程学院输配电装备及系统安全与新技术国家重点实验室,重庆400044 [3]重庆电力公司璧山供电局,重庆402760

出　　处：《广东电力》2010年第11期31-35,共5页Guangdong Electric Power

基　　金：广东电网公司科研项目(08093102)

摘　　要：接地引下线就近归算到接地网拓扑结构的交叉点时易造成可测节点位置偏移,对接地网故障诊断中端口电阻的测量产生影响,针对此,依据电网络理论推导出引下线偏移的灵敏度公式;结合4×4的模拟地网,分析引下线未偏移、偏移12.5%、偏移25%、偏移50%四种条件下对端口电阻测量值的影响,发现当引下线偏移约为50%时,对现场腐蚀诊断准确性影响较大;建议在现场试验中应尽量参考相关图纸,查清测量端口与主网连接位置。To evaluate influence on the port resistance measurement in fault diagnosis of grounding grid,for the measurable node deviation due to the normalization of grounding down line positions to the nearby nodes in grounding grid topological structure,a sensitivity equation is derived based on electric network theory;with an experimental grounding grid with sixteen branches as an example,the impacts of grounding down line deviation by 0%,12.5%,25%,50% on the port resistance measurement are analyzed.It is found that grounding down line deviation by about 50% has greater impact on the accuracy of on-site corrosion diagnosis.It is suggested that reference drawings should be used to the utmost in field testing,and the connecting positions of measuring ports and the main network should be clarified.

关 键 词：接地网 引下线 偏移 腐蚀 故障诊断 

分 类 号：TM862[电气工程—高电压与绝缘技术]