Impact of Ground Resistivity on Transmission Line Electrical Parameters

Esam Saafan

Abstract: In electric power systems, the overhead transmission lines are designed to transmit the electrical energy from one point to another. The electrical parameters calculations of the transmission lines are very important to the areas concerned to electromagnetic compatibility and transitional processes in power systems. The ground-return parameters of the transmission line passing over one-layered ground (homogenous ground) overestimate the electrical parameters values of the transmission line. Therefore, accurate calculations of the transmission line electrical parameters were performed in this research, taking into account the impact of the ground resistivity. Approximated values of ground resistivity for the most common soil types of homogenous ground in our region were utilized. The behaviors of the ground-return parameters (Carson correction factors) while varying the ground resistivity were explained. As a result, as the ground resistivity increases, the ground-return parameters increase and consequently the overall transmission line electrical parameters.

Keywords: Transmission Line Electrical Parameters, Ground-Return Parameters, Ground Resistivity, Carson Correction Factors