Evaluation of the Effect of Lightning Strikes on <i>SUTT-150kV</i> Based on ATPDraw

The 150 kV High Voltage Overhead Line or what is called SUTT-150kV as a distributor of electrical energy from one substation to another substation often experiences disruption due to lightning. This interference will reduce the reliability of the SUTT-150kV . Handling the consequences of lightning is very necessary to protect SUTT-150kV . The magnitude of the electric current from lightning striking a SUTT-150kV can exceed 100 kA. Evaluation of the protection performance of SUTT-150kV is very necessary. This research models a SUTT-150kV in the context of analyzing the protection of the line from the impact of lightning strikes using ATPDraw software. SUTT-150kV is modeled in several parts into: line (ground wire and phase conductor), crossarm, tower, tower surge impedance, string insulator, and tower ground resistance. So, the discussion in this paper is about the influence of the grounding resistance value of a transmission tower with the same lightning strike on each ground wire. When the electric current from lightning strikes the ground wire, the effect of the lightning strike can be seen on the phase conductors, both the top and bottom phase conductors. The induced voltage on the transmission tower can be reduced by reducing the tower's grounding resistance value.