Analysis of FDTD Crosstalk of Multiconductor Overhead Transmission Lines with a Frequency-Varying Ground Impedance Loss

In the study of crosstalk of multiconductor overhead transmission lines, the traditional model is often established on a perfectly conducting ground, ignoring the influence of the ground as a poor conductor on the transmission voltage and current. In this paper, the influence of being placed on the ground with a frequency-varying ground impedance loss is studied, and the contribution of ground impedance loss to crosstalk is added into the classical multiconductor transmission line (MTh) equation. For the parasitic parameters of overhead lines with insulating medium, a simple analytical method of hierarchical series method is adopted. According to the updated equation and the boundary condition derived by finite-difference time-domain (FDTD) method, the accurate crosstalk solution is obtained. In this paper, considering the influence of non-uniform medium and ground impedance loss and combining with Nal. time-domain analysis method, the crosstalk can be calculated accurately, which is of great significance for the research on crosstalk of multiconductor overhead transmission lines.