Transient surge impedance of a vertical conductor over the ground

被引:10
|
作者
Du, Y. [1 ]
Wang, Xinghua [1 ]
Chen, Mingli [1 ]
机构
[1] Hong Kong Polytech Univ, Dept Bldg Serv Engn, Kowloon, Hong Kong, Peoples R China
关键词
Surge; Impedance; Vertical conductor; Ground; Lightning; PEEC; SIMULATION; WIRE; VOLTAGE;
D O I
10.1016/j.epsr.2012.05.007
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
This paper presents an investigation into transient surge impedance of a vertical conductor over the ground during a lightning stroke. An equivalent circuit approach (PEEC) is employed to evaluate path-independent voltage on the conductor. The transient surge impedance is then computed in time domain until the reflected surge is back to the observation point. It is found that transient surge impedance increases as time goes on, and is determined by geometry of the conductor and waveform of the injected surge current. The transient surge impedance is neither affected by conductor height nor grounding resistance. The presence of a ground has no effect on transient surge impedance. A comparison with the approximate formulas for characteristic surge impedance is also made in the paper. The difference varies significantly with conductor height for the surge current with a long rising time. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:106 / 112
页数:7
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