Analytical Modelling of Grounding Electrodes Transient Behavior

This paper presents the results of analytical and numerical investigations to evaluate the impulse performance of grounding electrodes. Practical grounding electrodes used-for the lightning protection of power and industrigl systems are analyzed through, a comprehensive computer program developed for this purpose. The validity of the proposed methodology has been verified with various data available in the literature. Reaiistic models of grounding electrodes involve non-linear admittance elements which here are replaced with a pie% ewise-linear approach as a result of an artificial electrode segmentation.