Abstract

Understanding impulse response of a buried electrode helps for designing a better grounding system under the situations of surges. In this paper, the analysis of lightning impulse current has been carried on horizontal grounding electrode by varying its length. Present study has been performed using the approximate transmission line (TL) approach. In TL approach, space-time telegrapher's equation are reformed to Finite Difference Time Domain (FDTD) equations and the same are used for calculating induced voltage and current along the length of the grounding electrode. The aim of this work is to verify the applicability of this approach in the analysis of the horizontal grounding electrode excited by high impulsive currents. The effects of the ground conductivity (σ) on the induced over voltages and current on ground electrode is analyzed and results are reported.

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