Abstract
the 500 kV extra high voltage tower transmission line has the highest tower height among others towers transmission lines with the same voltage levels, therefore the possibility of shielding failure due to a direct lightning strike to the phase wire will be higher. This paper will study the design of the 500 kV Quadruple Circuit Compact Transmission Line which height is 105,35 m and the cross-arm length of Ground Steel Wire (GSW) from the center is 6,95 m. The maximum peak current of lightning that can strike the phase wire is 29,8 kA with the overvoltage on the upper phase of the insulator is 4010 kV. For this reason, a redesign will be proposed by increasing the cross-arm length of Ground Steel Wire (GSW) to improve the shielding angle, it will reduce the maximum peak current of lightning that can strike the phase wire (shielding failure ) so that the overvoltage on the upper insulator is also reduced, this value will be adapted with the value of Lightning impulse withstand voltage of the insulator to prevent flashover.
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