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Increasing in Information Technology also increase the use of computer and printer at home. On other hand the energy crisis causing "Saving Energy Lamp" (LHE) become largely used nowadays. Computer, Printer and "Saving Energy Lamp" are non linear load that cause a power harmonic distortion in the power system distribution grid, including in the pole-mounted transformer. The harmonic current that can caused transformer losses can be measured at pole-mounted transformer. In conclusion, increasing load at pole-mounted transformer (83,14%) will raise losses at load (6%) and current THD (Total Harmonic Distortion) (18.3%). In this measurement the current harmonic is higher than standard THD (8%).    Abstract in Bahasa Indonesia :  Dengan kemajuan teknologi informasi maka komputer dan printer semakin banyak digunakan di rumah tinggal. Di sisi lain, krisis energi menjadi pemicu meningkatnya penggunaan Lampu Hemat Energi (LHE). Komputer, printer & LHE merupakan beban non linier yang menjadi penyebab munculnya harmonisa yang dapat mengganggu sistem distribusi listrik termasuk Trafo Tiang (TT). Dengan melakukan pengukuran di TT maka dapat diketahui bahwa pada TT timbul arus harmonisa yang dapat meningkatkan rugi-rugi pada TT. Setelah dianalisa, diperoleh bahwa semakin besar pembebanan pada TT (83,14%) maka rugi-rugi beban akan semakin besar (6%) dan THD (Total Harmonic Distortion) arus akan naik (18,3%) & melebih standard THD (8%)  Keywords: harmonisa, trafo tiang.

Pengaruh Harmonisa Pada Gardu Trafo Tiang Daya 100 kVA di PLN APJ Surabaya Selatan