STUDY ON SURGE ARRESTER PERFORMANCE DUE TO LIGHTNING STROKE IN 20 KV DISTRIBUTION LINES

Abstract

Abstrak Electric energy has been transmiting from power station to end user with transmission and distribution lines. Lightning strokes are problems that occure in transmission and distribution lines and make them fault when the electric energy were transmited. Surge Diverter or Lightning Arrester has been installing to reduce these faults. In this paper the simulation of lightning stroke and lightning arrester performance on distribution lines 20 kV were done using EMTP (Electromagnetic Transient Program). Some parameters such us impuls voltage and increasing voltage on distribution line was inverstigated. As case study in this simulation, Mojosongo 1 main feeder 20 kV three phase lines were used. The simulation results show that the lightning stroke 20 kA in By1-61-61E-84-9I on S phase at 0,1 ms, make voltage on S phase was increased about 1,3054 MV. For R phase and T phase will increase of induced voltage were 0.79539 MV and 0.80484 MV. We also show the performance of MOV Arrester (Metal Oxide Varistor) in overcoming lightning stroke trouble, where arrester can decrease voltage up to 15.198 kV on S phase, while at R phase and T phase arrester can decrease voltage up to 11.375 kV and 13.616 kV. Key word : Distribution lines 20 kV, surge arrester, lightning stroke.