基于环状回流极的接地模拟试验平台测量研究  

Grounding Simulation Test Platform Based on Annular Reflux Electrode

作　　者：魏洪志 胡元潮[1] 黄涛 周文 沈文韬 胡晓连 WEI Hongzhi;HU Yuanchao;HUANG Tao;ZHOU Wen;SHEN Wentao;HU Xiaolian(Electrical and Electronic Engineering College,Shandong University of Technology,Zibo 255000,China;Construction Branch of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210036,China;State Grid Hubei Electric Power Co.,Ltd.,Huang-long-tan Hydroelectric Power station,Shiyan 442000,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000 [2]国网江苏省电力有限公司建设分公司,南京210000 [3]国网湖北省电力有限公司黄龙滩水力发电厂,湖北十堰442000

出　　处：《电瓷避雷器》2023年第6期148-156,共9页Insulators and Surge Arresters

基　　金：山东省自然科学基金(编号:ZR2021ME092);江苏省自然科学基金(编号:SBK2020042717)。

摘　　要：由环状回流极构成的接地模拟试验回路具有回路电阻小、散流路径合理的优点,在接地模拟试验中得到了广泛应用。然而回流极的引入会导致地中电位分布发生畸变,进而影响到接地电阻的准确测量。因此笔者从理论角度对接地模拟试验平台地中电位分布特征进行了研究,结果表明回流极的引入会拉低接地装置的地电位升、回流极与接地装置之间会产生零电位参考点、无法根据接地电阻定义得出准确接地电阻值;基于二端口理论推导得出了接地装置接地电阻的修正公式;采用CDEGS仿真软件将不同尺寸、不同型式接地装置以及不同土壤电阻率下接地电阻修正值与真实值进行了比较,结果表明修正值的绝对误差率均低于0.5%,验证了该修正公式的有效性,对于试验现场测量具有一定的指导意义。The grounding simulation test circuit composed of annular reflux electrode has the advantages of low circuit resistance and reasonable dispersion path,and has been widely used in grounding simulation test.However,the introduction of the reflux electrode will lead to the distortion of the potential distribution in the ground,which will affect the accurate measurement of the ground resistance.Therefore,the potential distribution characteristics of ground in ground simulation test platform are studied theoretically.The results show that the introduction of reflux electrode will lower the ground potential rise of the grounding device,zero potential reference point will be generated between the reflux electrode and the grounding device,and accurate grounding resistance can not be obtained according to the definition of grounding resistance.Based on two-port theory,the correction formula of grounding resistance of grounding device is derived.CDEGS simulation software was used to compare the corrected value of grounding resistance with the real value under different sizes,different types of grounding devices and different soil resistivity.The results show that the absolute error rate of the corrected value is less than 0.5%,which verifies the validity of the modified formula,and has certain guiding significance for field measurement.

关 键 词：接地模拟试验 环状回流极 零电位参考点 二端口网络 CDEGS 

分 类 号：TM862[电气工程—高电压与绝缘技术]