Abstract—This paper analyze arc phenomena including the secondary arc’s elongation in the Korean 765kV single transmission line (79km) between Sin-Ansung S/S and Sin-Gapyeong S/S, which will be installed at June 2006 in Korea. Especially both frequency independent and frequency dependent line models are compared to make our final decisions. And the significant simulation results are investigated by EMTP program. As a result, there is no need of HSGS in the Korean 765kV single transmission line in practical and economical point of view
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