EVALUASI DEGRADASI MINYAK PADA UNIT AUXILIARY TRANSFORMER (UAT) 2A DI PLTU PAITON MELALUI DISSOLVED GAS ANALYSIS (DGA)

Sarah Siti Nuraini Rachman Saputra, - and Tasma Sucita, - (2025) EVALUASI DEGRADASI MINYAK PADA UNIT AUXILIARY TRANSFORMER (UAT) 2A DI PLTU PAITON MELALUI DISSOLVED GAS ANALYSIS (DGA). S1 thesis, Universitas Pendidikan Indonesia.

Abstract

Transformator memegang peran kritis dalam sistem tenaga listrik, dan degradasi minyak isolasinya dapat mengakibatkan gangguan serius, seperti kegagalan operasional atau kerusakan permanen. Penelitian ini dilaksanakan di PLTU Paiton dengan fokus pada UAT 2A, yang berfungsi menurunkan tegangan dari 18 kV menjadi 10,7 kV untuk kebutuhan peralatan bantu pembangkit. Tujuan penelitian ini adalah untuk menganalisis tingkat degradasi minyak transformator melalui tiga parameter utama, yaitu water content, breakdown voltage, dan dissolved gas analysis serta mengetahui faktor penyebab degradasi minyak. Metode penelitian mencakup pengujian laboratorium berdasarkan standar internasional, yaitu IEC 60814 untuk kadar air, IEC 60156 untuk tegangan tembus, dan IEEE C57.104-2019 untuk interpretasi DGA. Pengujian DGA dilakukan dengan empat metode diagnostic, yaitu Gas Chromatograph, Roger’s Ratio, Duval’s Triangle, dan Duval’s Pentagon, untuk mengidentifikasi jenis dan tingkat gangguan yang terjadi. Alasan dilaksanakannya penelitian ini adalah adanya indikasi peningkatan gas terlarut seperti metana (CH4) dan etana (C2H6) dalam minyak transformator, yang dapat mengarah pada degradasi termal atau elektrikal. Hasil penelitian menunjukkan bahwa kadar air minyak berada dalam batas aman (7,7 mg/kg), sedangkan tegangan tembus mencapai 79,7 kV, jauh di atas standar minimum 30 kV. Analisis DGA mengungkapkan adanya gangguan termal suhu rendah berdasarkan Duval’s Triangle dan Pentagon, dengan dominasi gas hidrokarbon seperti etana (C2H6) dan metana (CH4). Temuan ini mengindikasikan bahwa degradasi minyak disebabkan oleh faktor termal, mungkin akibat overloading atau hot spot pada belitan transformator. Rekomendasi yang diberikan meliputi pemantauan lebih intensif dan purifikasi minyak jika konsentrasi gas terus meningkat. Dengan pendekatan analitis yang komprehensif, studi ini menegaskan pentingnya DGA sebagai alat diagnostik untuk memastikan keandalan sistem tenaga listrik. Kata kunci: Dissolved Gas Analysis (DGA), Degradasi Minyak, Transformator, Pemeliharaan Prediktif. Transformers play a critical role in the power system, and degradation of their insulating oil can result in serious disruptions, such as operational failure or permanent damage. This research was conducted at the Paiton PLTU with a focus on UAT 2A, which functions to reduce the voltage from 18 kV to 10.7 kV for the needs of auxiliary power plant equipment. The purpose of this study was to analyze the level of transformer oil degradation through three main parameters, namely water content, breakdown voltage, and dissolved gas analysis and to determine the factors causing oil degradation. The research method includes laboratory testing based on international standards, namely IEC 60814 for water content, IEC 60156 for breakdown voltage, and IEEE C57.104-2019 for DGA interpretation. DGA testing was carried out using four diagnostic methods, namely Gas Chromatograph, Roger's Ratio, Duval's Triangle, and Duval's Pentagon, to identify the type and level of disturbance that occurs. The reason for conducting this study was the indication of an increase in dissolved gases such as methane (CH4) and ethane (C2H6) in transformer oil, which can lead to thermal or electrical degradation. The results showed that the water content of the oil was within the safe limit (7.7 mg/kg), while the breakdown voltage reached 79.7 kV, far above the minimum standard of 30 kV. DGA analysis revealed low-temperature thermal disturbances based on Duval's Triangle and Pentagon, dominated by hydrocarbon gases such as ethane (C2H6) and methane (CH4). These findings indicate that oil degradation is caused by thermal factors, possibly due to overloading or hot spots in the transformer windings. Recommendations provided include more intensive monitoring and oil purification if gas concentrations continue to increase. With a comprehensive analytical approach, this study confirms the importance of DGA as a diagnostic tool to ensure the reliability of the electric power system. Keywords: Dissolved Gas Analysis (DGA), Oil Degradation, Transformer, Predictive Maintenance.

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Item Type:	Thesis (S1)
Additional Information:	https://scholar.google.com/citations?hl=en&authuser=1&user=nqqhgbIAAAAJ ID SINTA Dosen Pembimbing: Tasma Sucita: 5993914
Uncontrolled Keywords:	Dissolved Gas Analysis (DGA), Degradasi Minyak, Transformator, Pemeliharaan Prediktif. Dissolved Gas Analysis (DGA), Oil Degradation, Transformer, Predictive Maintenance.
Subjects:	L Education > L Education (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Fakultas Pendidikan Teknik dan Industri > Jurusan Pendidikan Teknik Elektro > Program Studi Teknik Tenaga Elektrik
Depositing User:	SARAH SITI NURAINI RACHMAN SAPUTRA
Date Deposited:	24 Oct 2025 02:32
Last Modified:	24 Oct 2025 02:32
URI:	http://repository.upi.edu/id/eprint/144019

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