THE FINITE ELEMENT METHOD FOR SIMULATING LIGHTNING-TRANSIENT VOLTAGE OF GROUNDING GRID WITH THE NON-UNIFORM PARAMETERS

Abstract

In this paper, we use a non-uniform transmission line model, in which the per – unit length parameters (L(x,t),G(x,t),C(x,t)) are dependent on space and time in [5], to simulate lightning-transient voltage of grounding systems under  lightning strikes. In this model, the electromagnetic coupling between different parts of the grounding systems is taken into account, but the skin effect and soil ionization along the electrodes are not considered. The simulation results are obtained by solving the telegrapher’s equations based on the time-domain finite element method (FETD). The modeling results compared with the literature data of [5] and [3] have proved the primacy and effectiveness of the proposed method.