地面附近架高线缆HEMP响应计算的Agrawal和Taylor模型比较

Comparison of Agrawal and Taylor models for response calculations of aboveground cable excited by HEMP

研究在高空核爆电磁脉冲(HEMP)的作用下,地面附近架高线缆感应瞬态电压、电流的传输线模型计算方法并进行比较。考虑到有耗地面的电气参数,列举了Agrawal和Taylor两种传输线理论模型的异同,应用格林函数求积分和叠加定理,分别采用两种模型,计算并比较了不同入射波和线缆布放状态下的电压、电流响应,以及各场分量(水平电场、垂直电场和水平磁场)单独存在时对电流、电压响应的贡献。结果显示,Agrawal和Taylor模型得到的电压、电流响应是一致的,可以考虑在有界波电磁脉冲模拟器中进行短线缆的效应实验;由于相同的场分量在不同的模型中对电压、电流响应的贡献并不相同,因此在阐述某一场分量对线缆响应贡献大小时,应该首先说明所采用的传输线模型。

There exist two transmission line coupling models, Agrawal model and Taylor model, which can be used for the calculation of the aboveground cable effects excited by incident HEMP plane wave. In views of the lossy ground, we summarized and then discussed the differences between these two models in the representation of coupling formulations, exciting source terms and boundary condition. The contributions to the induced current and voltage by various electromagnetic field components, such as the vertical electrical field, the horizontal electrical field and the horizontal magnetic field, are compared in terms of integral of Green function and superposition theorem. The results validate the conclusion that the contribution of the same electromagnetic field component is not the same using different transmission line models.