Analisis Pengaruh Temperatur pada Karakteristik Pre-Breakdown Voltage dengan Pengujian Isolasi Minyak Trafo

Purwanti D, Amanda Dwi (2018) Analisis Pengaruh Temperatur pada Karakteristik Pre-Breakdown Voltage dengan Pengujian Isolasi Minyak Trafo. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Transformator daya adalah sebuah peralatan tegangan tinggi yang sangat penting dalam pembangkit tenaga listrik. pada trafo proses kerjanya sering mengalami sebuah hambatan, hal tersebut disebabkan timbul panas pada inti dan belitan trafo karena pemakain secara terus menerus. panas yang timbul akibat rugi-rugi besi dapat mengurangi kekuatan dielektrik pada isolasi dan juga mengurangi masa umur pemakaian trafo. Media isolasi yang sering digunakan adalah isolasi cair jenis minyak. Kegagalan isolasi minyak berkaitan dengan adanya peristiwa partial discharge. Oleh karena itu, pada tugas akhir ini dilakukan nya analisis pengaruh temperatur pada karakteristik pre-breakdown voltage dengan pengujian isolasi minyak trafo. Pengujian ini dilakukan dengan memanaskan minyak ke dalam microwave dan setelah itu dilakukan pengambilan gambar proses terjadinya pre-breakdown voltage menggunakan kamera beresolusi tinggi, dan dilakukan bersamaan dengan merekam arus PD pada minyak trafo menggunakan Current Transformer (CT) sehingga dapat diketahui karakteristik arus pada saat fenomena pre-breakdown voltage. Hasil pengujian menunjukkan bahwa pada variasi suhu 60oC fenomena pre-breakdown voltage pada tegangan 24kV dengan arus yang terukur sebesar 3 ampere, untuk variasi suhu 90oC fenomena pre-breakdown voltage pada tegangan 26kV dengan arus yang terukur sebesar 3,5 ampere, dan pada variasi suhu 120oC fenomena pre-breakdown voltage pada tegangan 34kV dengan arus yang terukur sebesar 4,7 ampere. ============== The power transformer is a very important high voltage equipment in a power plant. The work process of the transformer is often subjected to an obstacle, due to the rise in temperature occurring at the core and winding of the transformer. The increase in temperature is caused by the continuous use of the transformer, thus affecting the isolation of the transformer. The most commonly used insulation is liquid oil type insulation. Failure of isolation of other transformer oil occurs due to decreased dielectric strength and duration of transformer usage. The failure of oil isolation is related to the presence of partial discharge events. Therefore, in this final assignment, he analyzed the influence of temperature on the characteristics of pre-breakdown voltage by testing the transformer oil insulation. This test is done by heating the oil into the microwave and then tested by capturing the process of pre-breakdown voltage using high resolution camera, and done simultaneously by recording current PD on transformer oil using current transformer (CT) so that can know the characteristic of current at the moment of phenomenon pre-breakdown voltage. The test results show that the phenomenon of pre-breakdown voltage is influenced by temperature rise on transformer oil, ie at 60OC warming temperature pre-breakdown at voltage 22kV up to 28kV, at heating temperature 90OC at voltage 26kV to 34kV, and at heating temperature 120 OC at voltage 32kV up to 42kV. The measured current at heating temperature 60 OC for 3 amperes, heating temperature of 90 OC current of 3.5 ampere and heating temperature of 120 OC measured current of 4.7 amperes.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Minyak Trafo, Fenomena pre-breakdown voltage, Arus PD, Oil Trafo, Fenomena Pre-Breeakdown Voltage, Current PD
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3401 Insulation and insulating materials
Divisions: Faculty of Electrical Technology > Electrical Engineering
Depositing User: Purwanti D Amanda Dwi
Date Deposited: 15 Aug 2018 08:16
Last Modified: 15 Aug 2018 08:16
URI: http://repository.its.ac.id/id/eprint/52379

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