电子学报 ›› 2022, Vol. 50 ›› Issue (5): 1159-1166.DOI: 10.12263/DZXB.20210120

• 学术论文 • 上一篇    下一篇

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

于建立1,2,3, 程龙2, 樊亚东3, 张迎栋2, 鲁志伟2   

  1. 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
  • 收稿日期:2021-01-18 修回日期:2021-05-04 出版日期:2022-05-25 发布日期:2022-06-18
  • 作者简介:于建立 男,1983年4月出生于吉林省通化市.现为潍坊学院副教授、硕士生导师.获省级科技进步奖1项.在国内外发表学术论文10余篇.E‑mail: yu_jianli@foxmail.com

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

YU Jian-li1,2,3, CHENG Long2, FAN Ya-dong3, ZHANG Ying-dong2, LU Zhi-wei2   

  1. 1.College of Information and Control Engineering,Weifang University,Weifang,Shandong 261061,China
    2.Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology,Ministry of Education (Northeast Electric Power University),Jilin,Jilin 132012,China
    3.School of Electrical Engineering and Automation,Wuhan University,Wuhan,Hubei 430072,China
  • Received:2021-01-18 Revised:2021-05-04 Online:2022-05-25 Published:2022-06-18

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200m以内地面、20m高和50m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.50m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.

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

Abstract:

In order to understand the characteristics of lightning electromagnetic pulse(LEMP) generated by cloud-to-ground lightning, the vertical electric fields within 200m with the different heights of ground, 20m high and 50m 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 50m 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.

Key words: cloud-to-ground lightning, electromagnetic pulse, FDTD, vertical electric fields, geoelectric parameters, ground equivalent thickness

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