局部不均匀大地中电缆阻抗频率特性的快速计算

Fast Evaluation of the Frequency Character of Cable Impedance in the Locally Non-uniform Earth

为了快速、准确地计算局部不均匀大地中电缆阻抗的频率特性 ,提出了一种虚拟媒质方法和柯西估计方法 (Cauchy’smethod)相结合的快速计算方法。该方法采用虚拟媒质方法求解局部不均匀大地中矢量磁位积分方程 ,得到几个不同频率下电缆阻抗值及其频率导数值 ,然后利用柯西估计法确定电缆阻抗参数关于频率的有理函数 。

In order to evaluate the frequency character of cable impedance in the locally non-uniform earth,an algorithm which combines the fictitious method and Cauchy's method is presented The cable impedance and its frequency-derivatives at a few frequency points are calculated by solving the magnetic vector potential integral equation using the fictitious medium method,and then the cable frequency character is approximated by a rational function by means of Cauchy's method