It is well known that grounding resistance under huge lightning current injection has current-dependent characteristics, whose mathematical model was already proposed by Liew and Darveniza in 1974. In this paper, where our final goal is reasonable design for lightning protection of 500-kV transmission tower, we adopt the dynamic grounding-resistance model to MODELS-ATP simulation. The effect of the model for the lightning surge analysis on 500-kV transmission line systems is discussed in detail.
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