基于三维模型法500kV交流输电线路绕击耐雷性能分析  

Analysis of LightningProtection Performance of 500kV AC Transmission Lines Based on Three-Dimensional Model Method

作　　者：冯欣楠 鲁志伟[1] 梁记云 庄鹏 FENG Xinnan;LU Zhiwei;LIANG Jiyun;ZHUANG Peng(School of Electrical Engineering Northeast Electric Power University,Jilin 132012)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012

出　　处：《东北电力大学学报》2022年第1期87-95,共9页Journal of Northeast Electric Power University

基　　金：国家科技部重大项目(2018YFB0904600)。

摘　　要：现有的二维电气几何模型将导线、避雷线高度等效为平均高度,所计算出的绕击跳闸率不能反应出档距上任意位置的绕击情况,考虑到输电线路绕击跳闸率的准确性和工程实用性,文中建立了三维电气几何模型,综合考虑了各截面导线悬挂高度、不等高悬挂、导线工作电压及相位、雷电入射角、地面倾角、高空风速、保护角及导线高度等因素.运用该模型分析某地区500 kV交流输电线路的三维绕击跳闸情况,在三维曲面上计算输电线路任意截面的绕击跳闸率,并对暴露距离进行三维分析.结果表明:输电线路档距上不同截面的绕击跳闸率相互差别很大,运用等效的平均高度计算的跳闸率并不能反映出线路的实际跳闸情况.The existing two-dimensional electrical geometric model equates the heights of conductors and lightning conductors as the average height.The calculated shielding failure rate cannot reflect the situation of shielding failure at any position on the span.Considering the shielding failure rate of transmission lines Accuracy and engineering practicability,this paper establishes a three-dimensional electrical geometric model,which comprehensively considers the suspension height of each cross-section wire,unequal height suspension,wire working voltage and phase,lightning incident angle,ground inclination,high-altitude wind speed,protection angle and wire height and other factors.The model is used to analyze the three-dimensional shielding tripping situation of 500 kV AC transmission lines in a certain area,calculating the shielding tripping rate of any section of the transmission line on the three-dimensional curved surface,and performing three-dimensional analysis of the exposure distance.The results show that the shielding failure trip rates of different sections on the transmission line span are very different from each other,and the trip rate calculated using the equivalent average height does not reflect the actual tripping of the line.

关 键 词：500 kV 交流 绕击 三维电气几何模型 暴露距离 雷电入射角 

分 类 号：TM247[一般工业技术—材料科学与工程]