基于修正直线法的大型接地网接地阻抗测试及误差分析  

Grounding Impedance Test and Error Analysis of Large⁃Scale Grounding Grid Based on Modified Straight⁃Line Method

作　　者：张耀文 白洁 王磊 刘卓 张一帆 ZHANG Yaowen;BAI Jie;WANG Lei;LIU Zhuo;ZHANG Yifan(Inner Mongolia Power(Group)Co.,Ltd.,Inner Mongolia Power Research Institute Branch,Hohhot 010020,China;Inner Mongolia Enterprise Key Laboratory of High Voltage and Insulation Techology,Hohhot 010020,China;Inner Mongolia Power(Group)Co.,Ltd.,Hohhot 010010,China)

机构地区：[1]内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司,呼和浩特010020 [2]内蒙古自治区高电压与绝缘技术企业重点实验室,呼和浩特010020 [3]内蒙古电力(集团)有限责任公司,呼和浩特010010

出　　处：《内蒙古电力技术》2023年第2期69-73,共5页Inner Mongolia Electric Power

摘　　要：针对采用直线法测试大型接地网接地阻抗时,线间互感会对测试结果产生较大影响的问题,采取算数修正的方法,对某电厂通过直线法获取的初始结果进行修正运算,结果低于该厂接地网接地阻抗设计值,有效消除了线间互感带来的误差。通过误差分析可以看出,该方法与远离夹角法所测数据的误差在可接受范围内,验证了该修正直线法对于消除线间互感、获得接地阻抗准确数据的有效性。For some large grounding grids without the condition of distance angle method to test grounding impedance,the straight⁃line method is usually adopted.However,the mutual inductance between lines that cannot be ignored will have a great influence on the test result.In this paper,an arithmetic correction method is adopted to correct the initial results obtained by linear method in a power plant,and the results are lower than the design value of the ground impedance of the grounding grid of the plant,which effectively eliminates the errors caused by mutual inductance between lines.The error analysis shows that the error of the value between this method and the distance angle method is within an acceptable range,which means that compared with the initial measured results,this modified straight line method is very effective in eliminating mutual inductance between wires and obtaining accurate data of grounding impedance.

关 键 词：接地网 接地阻抗 修正直线法 线间互感 误差 

分 类 号：TM862[电气工程—高电压与绝缘技术]