大地电参数和地面等值厚度对地闪通道附近垂直电场的影响  

Influence of Geoelectric Parameters and Ground Equivalent Thickness on Vertical Electric Fields Nearby the Return-Stroke Channel

作　　者：于建立 程龙[2] 樊亚东[3] 张迎栋 鲁志伟 YU Jian-li;CHENG Long;FAN Ya-dong;ZHANG Ying-dong;LU Zhi-wei(College of Information and Control Engineering,Weifang University,Weifang,Shandong 261061,China;Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin,Jilin 132012,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]潍坊学院信息与控制工程学院,山东潍坊261061 [2]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林吉林132012 [3]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《电子学报》2022年第5期1159-1166,共8页Acta Electronica Sinica

摘　　要：为了深入理解地闪回击电磁脉冲特性,采用时域有限差分方法计算了地闪回击200 m以内地面、20 m高和50 m高的垂直电场.分析了大地电导率、大地相对介电常数以及地面等值厚度三个特征量对该范围内垂直电场的影响.结果表明,该范围内地面和空间垂直电场均在2~3μs的快速上升后出现时间较长的“平台”波形,“平台”高度和波头上升陡度均随回击距离和高度增加而非线性降低.50 m远地面场和空间场“平台”高度随大地电导率增大分别提高和降低,10μs内最大变化5%~10%,并且此处“平台”高度随地面等值厚度增大而略有增加.大地相对介电常数对该范围内垂直电场的影响可忽略.In order to understand the characteristics of lightning electromagnetic pulse(LEMP)generated by cloud-toground lightning,the vertical electric fields within 200 m with the different heights of ground,20 m high and 50 m high were calculated by using the finite difference time domain(FDTD)method.The influences of three characteristic parameters of earth conductivity,earth relative permittivity and ground equivalent thickness on vertical electric field were analyzed.Results show that,in this range,the vertical electric field on ground and in space appears a long"platform"waveform after a rapid rise of 2~3μs.The platform height and the rise steepness of wave front decrease nonlinearly with the increase of return-stroke distance and height.The"platform"height of vertical electric fields with the return-stroke distance of 50 m on ground and in space increases and decreases respectively with the increase of the earth conductivity,and the maximum change is about 5%~10%within 10μs.In addition,the"platform"height with the same return-stroke distance increases slightly with the increase of ground equivalent thickness.The influence of the earth relative permittivity on the vertical electric field in this range can be ignored.

关 键 词：地闪 电磁脉冲 时域有限差分 垂直电场 大地电参数 地面等值厚度 

分 类 号：TM863[电气工程—高电压与绝缘技术]