架空多导体传输线HEMP响应建模及分析

Modeling and Analyzing of HEMP Coupling to Overhead Multiconductor Transmission Lines

在架空多导体传输线高空核爆电磁脉冲（HEMP）响应建模计算中,研究了不同参数的选取对响应计算结果的影响。首先利用链参数矩阵法对110kV线路进行建模,在模型中将线路端接设备等效为一系列互相连接的电容,计算了不同电磁波入射角Ψ、地面电导率σg和线长L下的线缆末端的响应电压和响应电流,分别归纳分析了3个参数与线缆响应幅值之间的关系。结果显示,随着入射角的增大,线缆末端的响应幅值均呈现出先变大后变小的趋势,当Ψ约为1°-5°时,达到极大值;线路长度较短时,线路末端的响应幅值随长度的增长而变大,当线长超过一定值后,线路响应则不再随线长的增长而变大。

This paper mainly studies the modeling effects of HEMP coupling to the multiconductor transmission lines. The 110 kV aerial lines are modeled with Chain Parameters Matrix Method. The incident angles ψ, the conductivity of ground δg, and the voltage and current responses of the line are calculated. The results show that the voltage and current responses of the line will augment then diminish with the increase of the incident angles, and the peak values appear at ψ=1°-5°. When the line＇s length is relatively shorter, the response amplitudes will increase with the increase of the length, but as the length reaches a certain value, the responses will no longer augment accordingly.