Analisis Kinerja Proteksi Petir Pada Saluran Udara Tegangan Tinggi 150 kV Di Saluran Transmisi Bintaro-Serpong

Abstract

Disturbances in electricity transmission systems are often caused by lightning strikes hitting transmission towers. This phenomenon is a significant problem in Indonesia, a tropical country with a high frequency of lightning days. Therefore, adequate lightning protection is indispensable to minimize disturbances on transmission lines. This study analyzes the performance of lightning protection on the 150 kV High Voltage Air Line (SUTT), especially on the Bintaro-Serpong transmission segment. The data obtained shows that the peak positive lightning current on the conductor of this line reaches 132 kA. Using impedance, current, and voltage calculation methods, the analysis shows that a lightning strike with a peak current of 132 kA on the transmission tower generates a transient flashover voltage of 1104.18 kV. On the other hand, when lightning strikes the ground wire, the current splits into two paths of 66 kA each, which results in a voltage of 1200.69 kV. The results of this analysis indicate that lightning protection on the Bintaro-Serpong transmission line is still not optimal because the resulting flashover voltage exceeds the insulator's Basic Insulation Level (BIL) limit of 1000 kV, which has the potential to increase the risk of Back Flashover interference. These findings indicate the need to improve the lightning protection system to reduce the risk of interference on transmission lines.