接地电阻测试误差与被测地网大小关系的探讨  

Discussion on the Relationship Between the Measurement Error of Grounding Resistance and the Size of the Measured Ground Grid

作　　者：黄克俭 鞠英芹[1] 胡双伟[2] 刘克稳 黄丁诚 HUANG Kejian;JU Yingqin;HU Shuangwei;LIU Kewen;HUANG Dingcheng(Hubei Branch of the Meteorological Cadre Training Institute of the China Meteorological Administration,Wuhan 430074,China;The Center of Lightning Protection in Hubei,Wuhan 430074,China)

机构地区：[1]中国气象局气象干部培训学院湖北分院,湖北武汉430074 [2]湖北省防雷中心,湖北武汉430074

出　　处：《电工技术》2023年第4期186-189,共4页Electric Engineering

摘　　要：针对采用普通接地电阻测试仪测试一定规模的地网接地电阻时存在的不符合技术标准测量规程要求的问题,对测试电极距离、被测地网大小与接地电阻测试误差的关系进行了研究,研究结果表明普通接地电阻测试仪测试中小型地网接地电阻的误差与地网的大小有关。对于半球体地网,在测试电流极与地网边缘距离分别设置在40、20、10 m,测试电压极设置在测试电流极与地网边缘的中点位置,被测试地网的半径分别不大于27、13.5、6.75 m时,地网接地电阻测试误差可在10%范围以内。测试电压极设置在测试电流极与地网边缘的中点位置及附近时测试误差较小,在相同的误差允许范围内,测试电压极的位置在测试电流极与地网边缘的中点位置的测试方法比补偿法可测地网规模更大。When using an ordinary grounding resistance tester to test the grounding resistance of a certain scale of grounding grid,there is a problem that it does not meet the requirements of technical standard measurement regulations.In order to solve this problem,the relationship between the distances of the test electrode,the size of the ground grid and the ground resistance test error is studied.The results show that the error of the grounding resistance of small and medium-sized ground grid ground grids tested by ordinary grounding resistance testers is related to the size of the ground grid.For the hemispherical ground grid,when the distance between the test current pole and the edge of the ground grid is set at 40,20,and 10 m,the test voltage pole is set at the midpoint of the test current pole and the edge of the ground grid,and the radius of the ground grid under test is not more than 27,13.5 and 6.75 m,respectively,the ground grid grounding resistance test error can be within the range of 10%.The test voltage electrode is set at or near the midpoint of the test current electrode and the ground grid edge,and the test error is small.Within the same allowable error range,the test method of testing the position of the voltage electrode at the midpoint of the edge of the test current electrode and the ground grid is larger than that of the compensation method.

关 键 词：接地电阻 地网半径 测试误差 电极距离 

分 类 号：TM865[电气工程—高电压与绝缘技术]