分层土壤下架空地线架设方案对感应雷过电压的影响  

Influence of Overhead Ground Wire Erection Scheme on Induced Lightning Overvoltage Under Layered Soil

作　　者：王科 胡逸 徐肖伟 杨庆[2] WANG Ke;HU Yi;XU Xiaowei;YANG Qing(Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]云南电网有限责任公司电力科学研究院,昆明650217 [2]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《电瓷避雷器》2025年第1期80-86,共7页Insulators and Surge Arresters

摘　　要：研究水平分层土壤下安装不同方案的架空地线对感应雷过电压的影响,可为实际10 kV架空配电线路的防雷设计提供参考。通过建立2维时域有限差分(2-D FDTD)算法模型,并结合Agrawal耦合模型计算架空配电线路的感应雷过电压。利用该算法研究了不同水平分层土壤特性对架空地线的防雷效果,且分析了在水平分层土壤结构下的10 kV单回三角配电线路采用不同架空地线架设方案对感应雷过电压的影响。结果表明:1)当上层土壤电导率较小时,上层土壤厚度对线路上的感应雷过电压幅值有较大影响,因此在实际防雷工程计算中不能忽略分层土壤的影响;2)架设单、双架空地线对单回三角排列下线路上的感应雷过电压抑制范围分别为7.8%~27.2%、12.0%~41.2%;3)处于中间相导线上方0.6 m架设双架空地线对单回三角排列下线路上的感应雷过电压的抑制整体效果最好。The influence of different schemes of overhead ground cables installed under horizontal stratified soil on induced lightning overvoltage is studied,providing reference for lightning protection design of actual 10 kV overhead distribution lines.By establishing a 2-D finite difference time domain(2-D FDTD)algorithm model and combining with Agrawal coupling model,the induced lightning overvoltage of overhead distribution line is calculated.The algorithm was employed to examine the impact of various horizontally stratified soil properties on the lightning protection of overhead ground lines and the impact of various overhead ground line erection strategies on lightning-induced surges for 10 kV single triangle distribution lines under such soil structures.The results show that:1)the thickness of the top soil layer has a stronger influence on the size of the lightning-induced surge on the line when the top soil layer's conductivity is low,therefore the impact of the layered soil cannot be disregarded in the calculations for lightning protection projects.2)the induced lightning overvoltage suppression range of single loop triangular alignment line with single grounding wire and double grounding wire is 7.8%-27.2%and 12.0%-41.2%,respectively.3)the dual overhead ground wire installed 0.6 m above the meso-phase wire has the best overall effect on the suppression of induced lightning overvoltage on the single-loop triangular arrangement line.

关 键 词：感应雷过电压 架空配电线路 2维时域有限差分算法 Agrawal耦合模型 水平分层土壤 架空地线 

分 类 号：TM863[电气工程—高电压与绝缘技术]