基于π型电路的接地极改进模型  

A Study on the Improved Model of the Grounding Electrode Based on the π-Type Circuit

作　　者：夏丽娟 李勇芳 XIA Lijuan;LI Yongfang(Qi＇nan Power Supply Branch of State Grid Chongqing Electric Power Company,Chongqing 401420,P.R.China)

机构地区：[1]国网重庆市电力公司綦南供电分公司,重庆401420

出　　处：《重庆电力高等专科学校学报》2018年第3期28-31,共4页Journal of Chongqing Electric Power College

摘　　要：该文提出了一种接地极的改良π型等效电路模型。该模型用集中参数的电感、电阻、电容元件表示,各元件参数采用曲线拟合技术进行确定,由此所计算得到的接地极在标准雷电流下的电压响应,与通过电磁场理论分析计算得出的结果,以及直接由试验测量得到的结果相吻合。此模型为输配电系统中的接地极防雷保护系统的发展和设计提供了一种十分有效的方法。This paper introduces an improved π-type equivalent circuit model of the grounding electrode,which is denoted by the inductance,the resistances and the capacity elements of the lumped parameters. The element parameters are determined by the curve-fitting technology. The calculated result of the voltage response of the grounding electrode in the standard lightning current based on the technology is identical to that of the analytical calculation by means of the electromagnetic field theory as well as that of the experimental measurement. The model not only is helpful for the application of such circuit simulation software as the EMTP and the PSPICE but also provides an effective method for the development and design of the lightning-protection system of the grounding electrode in the PTD system.

关 键 词：接地极 等效电路 雷电流 改良π型模型 土壤放电 

分 类 号：TM133[电气工程—电工理论与新技术]