Analisis Karakteristik Partial Discharge Di Isolasi Minyak Akibat Partikel Logam Melayang Pada Tegangan AC (Analysis of Partial Discharge Characteristics In Oil Insulation Affected by Floating Metallic Particle Under AC Voltage)

Rahman, Muhammad Al-Azhar Aulia (2021) Analisis Karakteristik Partial Discharge Di Isolasi Minyak Akibat Partikel Logam Melayang Pada Tegangan AC (Analysis of Partial Discharge Characteristics In Oil Insulation Affected by Floating Metallic Particle Under AC Voltage). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan minyak sebagai media isolasi pada peralatan sistem tenaga listrik dalam jangka waktu lama tidak terlepas dari adanya kontaminan berupa partikel konduktif dan non-konduktif, seperti partikel logam dan serat selulosa. Partikel kontaminan dapat memperburuk sebuah dielektrik melalui fenomena partial discharge (PD). Jika peristiwa PD terjadi secara terus-menerus dapat menyebabkan penurunan kekuatan dielektrik bahan isolasi hingga menyebaban kegagalan isolasi. Dengan adanya peristiwa tersebut, diperlukannya studi berupa investigasi karakteristik PD pada isolasi minyak terhadap adanya kontaminan berupa partikel logam melayang. Studi ini dilakukan dengan 2 metode yaitu pengujian dan simulasi berbaiss FEM. Pengujian menggunakan pembangkit tegangan tinggi ac dan variabel posisi peletakkan partikel kontaminan yaitu posisi menyentuh elektroda ground, posisi secara vicinity (jarak partikel 0,1 mm dengan elektroda ground) dan posisi center diantara 2 elektroda uji. Partikel kontaminan yang digunakan berupa partikel logam buatan berbahan dasar tembaga dengan variasi bentuk yang berbeda. Terdapat variasi bentuk yang digunakan yaitu partikel berbentuk bulat dengan diameter 3 mm, partikel silinder dengan diameter 2 mm; panjang 5 mm, dan partikel elips dengan diameter 1 mm; panjang 5 mm. Data diolah dengan metode Phase Resolved Partial Discharge (PRPD). Hasil pengujian menunjukkan bahwa adanya partikel kontaminan pada isolasi minyak dapat menurunkan nilai Inception Voltage dan nilai breakdown voltage. Variasi bentuk dan peletakan partikel kontaminan dapat mempengaruhi, sehingga pola PD yang didapatkan memiliki pola yang berbeda-beda. Hasil simulasi menunjukkan bahwa persebaran medan listrik dan besar nilai medan lisrik yang terjadi akibat partikel kontaminanan pada media isolasi minyak tergantung pada posisi dan tegangan suplai yang diberikan, sehingga dapat diketahui distribusi medan listrik yang terjadi. Berdasarkan pengolahan hasil PRPD dan Hasil simulasi menunjukkan bahwa partikel dengan posisi Vicinity sangat berbahaya. Hal ini disebabkan fluktuasi medan disalah satu celah partikel sehingga terjadi perkembangan peluahan streamer yang mana peristiwa PD mudah terjadi.
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Application of oil as an insulating medium in electrical power system equipment in the long term cannot be separated from the presence of contaminants in the form of conductive and non-conductive particles, such as metal particles and cellulose fibers. Contamination between oil and contaminant particles can be a dielectric through the phenomenon of partial discharge (PD). If the PD event occurs continuously it can cause a decrease in the dielectric strength of the insulating material to cause insulation failure. With this incident, a study is needed in the form of a PD investigation on oil insulation. This study was conducted using 2 methods, testing and simulation by FEM. The test using an AC high voltage generator and the variable position of the contaminant particle placement is the position touching the ground electrode, the position around the ground electrode and the center position between the 2 test electrodes. Contaminant particles used in the form of artificial metal particles made of copper with a variety of different shapes. There are variations of shapes used, namely spherical particles with a diameter of 3 mm, cylindrical particles with a diameter of 2 mm; 5 mm long, and elliptical particles with a diameter of 1 mm; 5mm long. The collected data will be processed using Phase Resolved Partial Discharge (PRPD) method. The test results show that the presence of contaminant particles in the oil can reduce the PDIV value and breakdown voltage value. With variations in the shape and placement of contaminant particles, so that the PD patterns obtained have different patterns. The simulation results show that the electric field and the magnitude of the electric field value that occurs due to contaminant particles in the oil insulating media depend on the position and supply voltage given, so that the distribution of the electric field that occurs can be known. Based on the processing of PRPD results and simulation results show that particles with the Vicinity position are very dangerous. This is due to field fluctuations in one of the particle gaps resulting in the development of a streamer discharge in which PD events easily occur.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Breakdown Voltage, inception voltage, Isolasi Minyak, Partial Discharge, Partikel Tembaga ============================================================= AC High Voltage Generation, Oil Insulation, Partial Discharge, Copper Particle
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3401 Insulation and insulating materials
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Muhammd Al-Azhar Aulia Rahman
Date Deposited:	14 Aug 2021 04:02
Last Modified:	14 Aug 2021 04:02
URI:	http://repository.its.ac.id/id/eprint/86166

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