Lightning electromagnetic fields and their induced voltages on overhead lines: the effect of a non-flat lossy ground
Lightning electromagnetic fields and their induced voltages on overhead lines: the effect of a non-flat lossy ground
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DOI：
10.1109/iclp.2014.6973193
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
J. Paknahad;K. Sheshyekani;M. Hamzeh;F. Rachidi
中科院分区：
文献类型：
--
作者：
J. Paknahad;K. Sheshyekani;M. Hamzeh;F. Rachidi
本文提出了一种精确的非平坦有耗地面模型，以研究其对雷电电磁场的影响以及对架空线路的感应电压。进行了模拟的上方和地下的雷电电磁场，以及对单导线架空线路上的感应电压。结果表明，雷电电磁场的所有组成部分的影响，由一个非平坦的地面配置。电场的径向分量随着陡度角θ从0增加到某一值而增加，超过该值，电场的径向分量开始减小。此外，电场的垂直分量随着非平坦表面的陡度角的增加而减小。方位磁场表现出类似于水平电场的行为。对于雷电感应电压，研究表明，非平坦有耗地面对感应电压的峰值和上升时间有显著影响。
This paper presents an accurate representation of a non-flat lossy ground to study its effect on the lightning electromagnetic fields as well as the associated induced voltages on overhead lines. The simulations are carried out for above- and under-ground lightning electromagnetic fields as well as for the induced voltages on a single conductor overhead line. It is shown that all components of the lightning electromagnetic fields are affected by a non-flat ground configuration. The radial component of the electric field increases as the steepness angle θ increases from 0 to a certain value beyond which it starts decreasing. Also the vertical component of the electric field decreases as the steepness angle of the non-flat surface increases. The azimuthal magnetic field shows a behavior similar to the horizontal electric field. As for the lightning induced voltages, it is shown that, the peak value and the rise time of the induced voltages are markedly affected by the non-flat lossy ground.