This paper describes a method for estimating lightning fault rates of transmissions line by statistical calculation using XTAP. Lightning current waveforms have been observed in Hokuriku area along the coast of the Japan Sea to use them for lightning surge simulation. Also we developed the method for estimating lightning fault rate of transmission line considering on dispersion of flashover voltage of arcing horns. Based on the observed current waveforms and the frequency of strokes to the transmission tower, the transmission line fault rate was calculated using the statistical function of XTAP. The calculated and actual transmission line fault rates were agreed well.
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