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

页码：129 / 135

页数：7

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