Analysis of plane wave coupling to multi-conductor line above lossy soil

The paper presents comparison between rigorous electromagnetic model and two approximate approaches of modeling plane wave coupling to multi -conductor horizontal line above a homogeneous lossy soil. The first approximate approach is based on quasi-static complex image theory (CI) and the second approximate approach uses transmission line theory (T L). Our objective is to analyze the numerical error when calculating the current distribution by when using the proposed approximate models. Here, the reference results are obtained by using the electromagnetic model (E M) that is based on the full wave theory and thus developed on least theoretical neglects. The numerical results of detailed parametric analysis indicate the frequency range of applicability of the proposed approximate models with rms error of the current distribution less than 10%. (author)