Longitudinal behaviour of grounding electrodes subjected to lightning currents using SSR based TLM

This investigation is devoted to characterize the lon- gitudinal behaviour of grounding electrode subjected to first and subsequent lightning currents. The State Space Representation (SSR) based Transmission Line Method (TLM) has been used to obtain current and potential along the electrodes buried in resistive soils. A new time parameter consists in the ratio of the potential peak time to the current one has been proposed to identify the variation of the transient behaviour along grounding vertical and horizontal electrode. We show that soil resistivity, electrode length and impulse peak time of injected current are the most influential parameters.