Penentuan Kapasitas Arus Surja Alat Proteksi Petir (SPDs) Yang Dibutuhkan Sebuah Gedung Yang Tersambar Petir Secara Langsung

Abstract

If lightning rod of building is directly struck by lightning, then lightning current will flow through lightning rod, down conductor and then through bonding bar. Lightning current will be distributed to lines that are connected with the bonding bar, among other things: grounding electrode, plumbing, power line, telephone line and other conductors are connected to the bonding bar in the building. Lightning current distribution on a building is different from other buildings, depending on the existing conductor lines in the building. Therefore, before installing SPDs at the lightning protection system on a building must first calculate the lightning current distribution in the building to determine the maximum current surja be borne by SPDs. In this study conducted determining the maximum lightning current capacity of the SPDs that required every conductor lines in the building by calculating the ligtning current distribution. Variables that cause changes on distribution lightning current was varied to obtain the maximum lightning current that bear by SPDs. The calculation is done by using EMTP program. The results showed that when the building directly struck by lightning, not all lightning current flow into the grounding but will be distributed to the existing conductor lines in the building. The results showed that out of five cases calculated, the largest lightning current flow into power lines are 7.29 kA and the largest lightning current through the telephone line is 50.9 kA. Key words: Lightning current, SPDs, EMTP