用于架空线缆电磁脉冲响应计算的Agrawal和Vance模型比较

Comparison of Agrawal and Vance Models for Response Calculations on Aboveground Cable Excited by Electromagnetic Pulse

为研究在电磁脉冲(electromagnetic pulse,EMP)的作用下,Agrawal和Vance模型在计算线缆响应方面的异同,从理论和仿真两方面分析了2种模型在传输线方程、微分变量、边界条件及激励源方面的区别。结果表明:由于Agrawal模型比Vance模型多出2个由垂直电场产生的等效集总源,故前者计算结果大于后者;若不考虑负载端由垂直电场产生的等效集总源的影响,Agrawal和Vance模型将获得相同计算结果。最后,对于线缆架设高度、线长、电磁脉冲入射角度等参数对2种模型计算结果的影响进行了仿真分析。结果表明:架空线缆线上感应电流分别随架设高度和线长的增加而增大;在[0,π/2]范围内,感应电流分别随极化角、方位角的增加而减小,随俯仰角的增加而增大。

In order to find the similarities and differences between Agrawal model and Vance model,which can be used for the calculation of the cable effects excited by incident electromagnetic pulse（EMP）,we discussed the differences of transmission line equations,differential variables,line terminations and exciting sources between these two models by theoretical analysis and simulation,results show that since there are two equivalent lumped sources produced by vertical electrical field in Agrawal model which are not in Vance model,the calculation results of the former are larger than those of the latter;if the two equivalent lumped sources are not taken into account,the calculation results of two models would be the same.At last,the factors that affect the calculated results are analyzed,such as the height,length of cable,the incident angles of EMP,and so on,results show that the induced currents increase separately with the increase of height or cable length;in the range of ,the induced currents decrease respectively with the increase of polarization angle or orientation angle,and increase with the increase of pitching angle.