Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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采用新颖格式FDTD计算大地垂直分层雷电电磁场

来源:电体育下注网站电体育下注平台发布时间:2020-07-16 14:16 浏览次数:41
 
采用新颖格式FDTD计算大地垂直分层雷电电磁场
 
金涛斌1,王龙飞2,刘正文2,罗雨2
(1 呼和浩特市城市轨道交通建设管理有限责任公司,内蒙古 呼和浩特 010000;2 北京石油化体育下注网站学院 机械体育下注网站程学院,北京 102617)
 
    摘 要:雷电电磁脉冲会通过耦合作用产生瞬时高电压和大电流干扰,研究雷电放电过程并快速、精确计算雷电电磁场分布,可有效减少设备损失,降低事故率。在二维柱坐标系下,提出了一种新颖格式的FDTD算法,能够更精确计算大地垂直分层且分界面离雷电通道较近情况下的雷电电磁场分布,计算结果表明:对大地垂直分层且分界面离雷电通道较近时,计算离雷电通道50 m范围内的雷电电磁场,新颖FDTD的计算精度较传统FDTD有显著提高,而计算离雷电通道50 m范围外的雷电电磁场,其计算结果与传统FDTD计算结果趋于一致,这说明提出的新颖格式FDTD具有传统FDTD的所有优点,并且在计算大地垂直分层情况下,较传统FDTD具有更高的计算精度,在计算雷电电磁场时,具有更广泛的适用性。
    关键词:雷电电磁脉冲;雷电电磁场;二维柱坐标系;大地垂直分层
    中图分类号:TM863     文献标识码:A     文章编号:1007-3175(2020)07-0024-05
 
Calculation of the Lightning Electromagnetic Field for Vertically Stratified Ground Using Novel Scheme FDTD
 
JIN Tao-bin1, WANG Long-fei2, LIU Zheng-wen2, LUO Yu2
(1 Hohhot Rail Transit Construction Management Co., Ltd, Hohhot 010000, China;
2 School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China)
 
   Abstract: Lightning electromagnetic pulses will generate instantaneous high voltage and high current interference through coupling, studying on the lightning process and calculating the lightning electromagnetic field quickly and accurately can effectively reduce equipment losses and accident rate.In the two dimensional cylindrical coordinate system, a novel format of FDTD (NFDTD) algorithm is proposed which can calculate the lightning electromagnetic field distribution more accurately in the case that the ground is vertically layered and the interface is near the lightning channels.The numerical result shows that for vertically stratified ground when the vertical interface is not far away from the lightning channels, the NFDTD has higher precision than the TFDTD within the range of 50 m from the lightning channels, and the results using the NFDTD and the TFDTD tend to come together beyond the range.It is shown that the NFDTD has a great advantage over the TFDTD and the NFDTD has a wide applicability in calculating the lightning electromagnetic field.
   Key words: lightning electromagnetic pulse; lightning electromagnetic field; 2-D cylindrical coordinate system; vertical stratification of the earth
 
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