全向电磁场与架空线缆的耦合响应分析

Analysis of Terminal Coupling Response of the Omnidirectional Incident Electromagnetic Fields

构建了全向入射电磁环境,使得入射电磁波极化角在[0,π/2]范围内,入射角在[0,2π]范围内,方位角在[0,π/2]范围内随机均匀分布,电磁波入射点随机分布在以线缆为球心的单位球上。重点研究了Agrawal模型和Vance模型在解决场线耦合问题时的异同,分析了线缆高度、长度、半径以及端接电阻等参数对场线耦合结果的影响。仿真结果表明:Agrawal模型和Vance模型对全向电磁波的响应波形大体一致,但在响应幅值上会出现一定的偏差,这主要是由于Agrawal模型中因垂直电场的存在而产生的集总源的缘故,当忽略掉集总源后,两个模型可获得相同的响应结果。线缆上响应电流随着线缆离地高度、长度和半径的增加而增大。不同端接电阻响应电流的峰值大小随着端接负载的增大而减小。

An omnidirectional incident electromagnetic environment was constructed,so that the polarization angle of the incident electromagnetic wave was within the range of [0,π/2],the incident angle was within the range of [0,2π],and the azimuth angle was randomly distributed within the range of [0,π/2].The incident points of the electromagnetic wave are randomly distributed on a unit sphere centered on the cable.We focused on studying the similarities and differences between the Agrawal model and the Vance model in solving the field line coupling problem,and analyzed the effects of parameters such as cable height,length,radius,and termination resistance on the field line coupling results.The results show that the response waveforms of the Agrawal model and the Vance model to omnidirectional electromagnetic waves are generally consistent,but there is a certain deviation in the response amplitude.This is mainly due to the presence of a lumped source caused by the vertical electric field in the Agrawal model.When the lumped source is ignored,the two models can obtain the same response results.The response current on the cable increases with the height,length,and radius of the cable above the ground.The peak value of the response current of different terminal resistors decreases with the increase of terminal load.