Evaluasi Penangkal Petir Eksternal dengan Membandingkan Metode Sudut Proteksi, Metode Jala-Jala dan Bola Bergulir (Studi Kasus Gedung Biro Rektor USU)

Abstract

Geographically Indonesia is located on the equator with a tropical climate and high humidity, this causes Indonesia to be included as a region that has high thunder days per year and has a density of lightning strikes. Medan City is one of the largest cities in Indonesia which is potentially prone to lightning due to the growth of convective clouds around the slopes of the mountains. In this study carried out a related analysis and compared the protection angle method and the rolling ball method in the Rector's Bureau building at the University of North Sumatra by evaluating the external lightning protection system by comparing the protection angle method, the nets method and the rolling ball and also the author will design a system protection against the danger of lightning strikes at the Rector's Bureau Building, University of North Sumatra. The results of the analysis in this study indicate that the Rector's Bureau Building at the University of North Sumatra has a lightning strike area of around 33,493.23 m2 with an average lightning strike to the ground of around 38.63 strikes per square kilometer per year, the efficiency of the protection system in the building is around 0.92 and enters into level of protection level 2. Using the angle of protection method in the Rector's Bureau Building, University of North Sumatra, there are still several rooms on the right and left sides on the 3rd and 4th floors that still have the potential to be hit by lightning by installing the 1st lightning rod with a height of 9 meters and 2nd lightning rod with a height of 22 meters. Installation using the rolling ball method no longer has the potential to be hit by lightning by installing 47 Splitzen on the roof of the building. While the rolling ball method can identify areas that need protection, the rolling ball method can be applied to all types of building designs. This is different from the angle of protection method which is limited to evaluating the effectiveness of the designed lightning protection system. The mesh method is the easiest method to implement but the investment costs are quite expensive.