Characteristics of electromagnetic return-stroke models

被引：47
|
作者：
Baba, Y [1 ]
Ishii, M [1 ]
机构：
[1] Univ Tokyo, Inst Ind Sci, Minato Ku, Tokyo 1538505, Japan
来源：
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY | 2003年 / 45卷 / 01期
关键词：
LEMP; numerical electromagnetic (EM) field analysis; return stroke;
D O I：
10.1109/TEMC.2002.808037
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Impedance and associated electromagnetic (EM) fields of an EM return-stroke model are investigated with the help of NEC-2. The impedance of a cylindrical vertical conductor increases with time. The impedance of a vertical conductor having additional distributed inductance is initially 700 to 1000 Omega for the current propagation velocity ranging from 170 to 130 m/mus. This is in good agreement with the apparent impedance of a lightning channel, estimated from lightning-current waveforms measured at the top and bottom of tall towers. A model considering a horizontally bent channel in a thundercloud succeeds in reproducing all of the established features of measured field waveforms except the hump of close magnetic field, while a vertically straight conductor fails to reproduce two of the features.
引用
收藏
页码：129 / 135
页数：7
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