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"Skripsi ini membahas tentang pengaruh suhu terhadap degradasi isolasi dan perkiraan nilai harapan hidupisolasi padat dan cair transformator. Hasil pengujian menunjukkan bahwa temperatur berbanding terbalik dengan tegangan tembus dan temperatur akan memperkecil nilai harapan hidup isolasi.Tegangan tembus isolasi paling rendah secara berurutan dari variasi jarak 0 cm hingga 1,5 cm terdapat pada temperatur 1400C yakni sebesar 13,87kV, 21,07kV, 32,52kV, dan 39,78kV. Sementara paling tinggi saat temperatur minyak 950C sebesar 15,47 kV, 23,38 kV, 35,42 kV, dan 41,12 kV. Nilai harapan hidup transformator pada suhu 950C, 1080C, 1230C, dan 1400C masing-masing adalah 99,9973%, 99,9892%, 99,9518%, dan 99,7707%.

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The following thesis is discussing the effect of temperature to insulation degradation and life expectancy of transformer’s liquid and solid insulation. The test result shows that the temperature will be inversely equivalent to breakdown voltage and will reduce the life expectancy of transformer’s insulation. The lowest breakdown voltage occurs at temperature of 1400C which values from 0 cm to 1,5 cm respectively are 13,87kV, 21,07kV, 32,52kV, dan 39,78kV. Whilethe highest occurs at 950C which values from 0 cm to 1,5 cm respectively are 15,47kV, 23,38kV, 35,42kV, and 41,12kV. Life expectancy values of transformer’s insulation at temperature of 950C, 1080C, 1230C, and 1400C respectively are99,9973%, 99,9892%, 99,9518%, dan 99,7707%."

"Transformer adalah salah satu alat yang paling penting di dalam Sistem Tenaga Listrik. Transformer digunakan untuk meningkatkan atau menurunkan level tegangan atau arus pada sistem tenaga. Maka, kondisi trafo akan mempengaruhi kestabilan dan keandalan sistem secara keseluruhan. Pada praktisnya, Degradasi pada isolasi akan mempengaruhi keadaan trafo secara keseluruhan dan mengurangi umur trafo. Degradasi pada isolasi ini disebabkan oleh banyak hal seperti cuaca, penuaan, atau pembebanan. Banyak penelitian yang dilakukan untuk memperpanjang umur isolasi. Maka dari itu, disini berusaha diterapkan pada penelitian ini, suatu cara baru untuk memperpanjang umur isolasi, yaitu dengan selimut nitrogen. Umumnya, selimut ini digunakan untuk sebagai pelindung pada bahan bakar pada kapal tanki. Di sini berusaha diterapkan teknik ini pada trafo dengan menimbang pada kondisi trafo yang mirip dengan kondisi fisik dan kimia pada tanki bahan bakar pada kapal tanki. Selimut nitrogen ini kemudian ternyata terbukti dalam penelitian ini dapat melindungi isolasi, memperpanjang umur dan kualitas isolasi, serta mampu untuk memperpanjang umur trafo secara keseluruhan.

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Transformer is one of the most important part of the electrical Power System. It is used for elevating or lowering the voltage and the current from the power system. Hence, the transformer condition will affect the stability and the reliability of the whole electrical power system. In practice, The degradation from the insulation condition will affect the whole transformer system. The degradation will reduce the whole transformers lifetime. This degradation is caused by many aspects, such as; the weather condition, the amount of electrical loads, Oxygent and Free radicals levels, and arching. Many experiments have tried to reduce the impact of these aspects. Therefore, in this study, the author try to apply and test the Nitrogent blanketing system into transformer insulation system either to the solid insulation or the liquid insulation. This Nitrogent blanketing system is commonly used for transfering chemical substance or for mantaining and protecting the ship gas tank condition. The author try to apply this technique into the transformer system, considering the system of the transformer insulation is similar with the gas tank or chemical tank substance system. In this paper, The Nitrogen blanketing system is proven can protect the transformer insulation condition, and extend the whole transformer lifetime condition.

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"Pada sistem pembangkitan, transmisi maupun distribusi sistem tenaga listrik, transformator merupakan salah satu aset yang paling berharga dan penting dalam penyaluran tenaga listrik. Kelangsungan operasi dari transformator sangat bergantung pada kualitas sistem isolasinya. Selama masa operasi transformator, minyak transformator akan mengalami degradasi atau pemburukan karena faktor temperatur yang tinggi serta reaksi kimia yang terjadi seperti oksidasi. Penuaan pada minyak isolasi tentunya juga akan mempengaruhi karakteristiknya, seperti sifat fisik dan sifat elektrik, serta menurunkan masa guna isolasinya.Skripsi ini membahas tentang penuaan minyak isolasi. Penelitian percepatan penuaan termal dilakukan untuk mengetahui perilaku pemburukan minyak isolasi Nynas Nytro 10X dan memprediksi masa gunanya. Berdasarkan hukum Arrhenius yang diterapkan, jika temperatur sampel minyak 600C pada transformator yang beroperasi secara normal, maka prediksi masa guna minyak isolasinya sebesar 697,079 jam. Selanjutnya, prediksi persentase penurunan masa guna isolasi transformator IBT CBN fasa S pada kondisi pembebanan normal, pembebanan darurat waktu lama, serta pembebanan darurat waktu singkat berturut-turut sebesar 0,002032%, 0,047435%, dan 0,957268% terhadap sisa masa guna normal isolasinya 5,5 tahun.

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In the generation, transmission, and distribution of electrical power system, transformers are the most valuable and important assets in electrical power system. The operation continuity of transformers are highly depends on the quality of insulation systems. During transformers service life, degradation and deterioration of the oil occurs because of high temperature and chemical reaction such as oxidation. Aging of transformer oil will reduce physical properties, electrical properties, and its lifetime.This thesis focus on the aging of insulation oil. Thermally accelerated aging experiments are performed to observe deterioration of insulation oil, mainly Nynas Nytro 10X oil, and estimate its lifetime. Based on Arrhenius law, if the temperature of oil is 600C for normal loading condition, so its lifetime will be 697,079 hours. Then, percent loss-of-insulation life of IBT CBN (phase S) transformers based on variation loading condition. Percent loss-of-insulation life at normal, long time emergency, and short time emergency load profile respectively are 0,002032%, 0,047435%, and 0,957268% based on its remaining normal insulation lifetime 5,5 years."

"This book focuses on oil-paper insulation included in power transformers, especially for EHV and UHV transformers. The importance on insulation ever increased due to a growing voltage rating of transformers. Within the last decades, although research on the transformer insulation and diagnosis methods has advanced a lot, the insulation of HV transformers remained more or less unchanged. The book is divided into five chapters; the first and second chapters explain the basics of oil insulation, while the third chapter focuses on paper insulation. The final two chapters deal with the methods and outcome of testing both techniques. The primary target audience for this book is graduate students and power system engineers."