Grounding modeling using transmission line theory: Extension to arrangements composed of multiple electrodes

This paper presents the application of transmission line theory to analyze grounding arrangements composed of multiple parallel electrodes. The grounding system is treated as a multiconductor transmission line and a solution method based on a similarity transformation is used to solve the resultant equations. The impulse response of grounding arrangements composed of multiple grounding rods and horizontal electrodes are simulated, and the results are presented in terms of the grounding potential rise and impulse coefficient. The accuracy of the results is assessed by comparison with simulations of the same cases using an electromagnetic field approach. The proposed model is useful to estimate quantities related to the lightning response of typical grounding arrangements of transmission and distribution lines.