PENGGUNAAN LIGHTNING ARRESTER PADA GARDU INDUK SUNGAI JUARO PALEMBANG

Protection system plays an important role in the survival and security of the substation in the energy supply. Arrester is one of the tools in the protection system to protect from over voltage disturbances originating from lightning strikes. The aim of this study was to calculate and analyze the level of protection, against power transformer arrester, the safe distance between arrester and transformer power to get a good protection against harmful lightning surges. To solve the problems of interference caused by lightning surge lightning arrester is installed as close as possible to put on the transformer clamps to protect electrical equipment. The result of calculations for a distance of 4 m, type 1 MB75 arrester capable of withstanding the wave front under 700 kV/μthe greater the arrester capable of withstanding surge wave front tilting the better the equipment in substations are protected. The evaluation shows that the distance between arrester and transformer installed in the substation Sungai Juaro Palembang less than the maximum to protect electrical equipment, especially power transformer. Key words: lighting attack, arrester distance, level of protection