一种用于计算雷击接地网时最小冲击接地阻抗值的方法  

A Way Used to Calculate the Least Impulse Grounding Impedance When Lightning Strike on the Grounding Grid

作　　者：柴健[1,3] 杨仲江[1,2] 孙京[1,4] 

机构地区：[1]南京信息工程大学大气物理学院,南京210044 [2]南京信息工程大学,气象灾害省部共建教育部重点实验室,南京210044 [3]湖北省防雷中心,武汉430074 [4]中国气象局武汉暴雨研究所,武汉430074

出　　处：《电瓷避雷器》2012年第3期77-81,共5页Insulators and Surge Arresters

基　　金：公益性行业科研专项(编号:GYHY200806014)

摘　　要：为了研究接地网在雷击时冲击接地阻抗的特性,提出了一种型等值电路,在考虑火花效应的条件下,运用ATP-EMTP仿真软件对接地网进行分析计算。将土壤电阻率以内分为四个区间,每个区间对应一个地网有效面积值。并运用多项式回归分析软件得出相应区间的冲击接地阻抗拟合公式,能方便计算不同条件下冲击接地阻抗的最小值。为防雷接地工程计算提供参考依据。In order to study on the characteristic of the impulse grounding impedance when lightning strike on the grounding grid, a equivalent circuit model of π type. is presented, based on spark discharge equivalent radius, grounding grid is analyzed and calculated by using ATP-EMTP simulation software. The soil resistivity which is under p=1000 Ω·m is divided into four intervals, every interval corresponding to an effective area of the grounding grid. The fitting formula of impulse grounding impedance of corresponding interzone is obtained by using polynomial regression analysis software, the least impulse grounding impedance in different conditions can be easily calculated. A reference is provided for grounding engineering of lightning protection.

关 键 词：冲击接地阻抗 接地网 仿真 有效面积 

分 类 号：TM862[电气工程—高电压与绝缘技术]