配电网支线结构对雷击浪涌传播特性的影响分析  

Study on Influence of Types of Branch Line Configuration in Distribution Network on Propagation Characteristics of Lightning Surge

作　　者：程子霞[1] 张宇凡 马志豪 刘杰[1] CHENG Zixia;ZHANG Yufan;MA Zhihao;LIU Jie(School of Electrical Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学电气工程学院

出　　处：《电瓷避雷器》2019年第4期161-164,170,共5页Insulators and Surge Arresters

摘　　要：配电网线路雷电防护能力较弱且线路结构路径复杂,需要分析支线结构对雷击浪涌传播特性的影响.利用EMTP软件搭建配电网线路模型,分析H型支线结构与π型支线结构下雷击过电压传播特性,通过行波理论对结果予以分析,讨论配网连接点处安装避雷器的防护效果.分析结果表明:线路分支过电压随着距雷击点距离的增加而降低,且线路分支长度越长,分支终端过电压越小;线路结构分支数量越多,行波折射系数越小,各分支线路过电压越低,H型分支结构线路过电压明显小于π型分支结构;在配电网主线与支线连接点处安装线路避雷器能够在一定程度上降低各分支过电压.Due to weak protection ability against lightning and complex branch line configuration,it is necessary to study the influence of types of branch line configuration in distribution network on propagation characteristics of lightning surge.The 10kV distribution network is established in EMTP and typical types of branch line such H-type and PI-type are analyzed.Protection effect of installing surge arrester in the junctions of the distribution network is also discussed.Simulation results show that:overvoltage of branch lines decrease with the increasing of distance from lightning locations as well as the length of branch lines.According to the traveling wave theory,more number of branch lines result in smaller refraction coefficient and overvoltage of the branch line,which explains overvoltage in the H-type is always less than that in the PI-type.It is feasible and effective to install surge arrester in the junctions of the distribution network.

关 键 词：配电网 支线 雷电浪涌 行波 避雷器 

分 类 号：TM8[电气工程—高电压与绝缘技术]