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Paper impregnated oil (paper-oil insulation) is used as insulation material in transformer. The water in transformer appears as a consequence of oxidation process of the paper-oil system and atmospheric air penetration into the tank. High voltage testing is used to test paper-oil insulation with different water content to examine its breakdown voltage. Three conditions were used in this research, which are initial condition, the condition after heating up to 700C, and the condition after cooling down at room temperature for 2 x 24 hour. The result of high voltage tests shows that the water content can decrease the breakdown voltage and the dielectric strength of paper-oil insulation. The heating-cooling process reduces the water content of oil insulation and therefore increases the breakdown voltage and dielectric strength of paper-oil insulation. Isolasi kertas yang dicelup minyak (isolasi kertas-minyak) adalah isolasi yang digunakan pada transformator. Air dapat timbul sebagai akibat proses oksidasi dan penetrasi udara luar selama transformator beroperasi. Pengujian tegangan tinggi dilakukan terhadap isolasi kertas-minyak dengan kadar air yang berbeda untuk mengetahui besar tegangan tembusnya. Pengujian tegangan tinggi dilakukan terhadap isolasi kertas-minyak pada tiga kondisi, yaitu kondisi awal, kondisi setelah dipanaskan sampai suhu 700C, dan kondisi setelah didinginkan pada suhu ruangan selama 2 x 24 jam. Dari hasil pengujian tegangan tinggi, diperoleh kesimpulan bahwa kenaikan kadar air akan menurunkan tegangan tembus dan kekuatan dielektrik isolasi kertas-minyak. Diketahui juga, proses pemanasan dan pendinginan menurunkan kadar air dalam isolasi kertas-minyak sehingga dapat meningkatkan tegangan tembus dan kekuatan dielektrik isolasi kertas-minyak.

Pengaruh Kadar Air terhadap Karakteristik Tegangan Tembus dan Dielektrik Isolasi Kertas-Minyak