Pengaruh Kadar Air Terhadap Performa Dielektrik Minyak Mineral, Ester Sintetis, Dan Nanofluid Berbasis Ester

Mahesruri, Muhammad Farrel (2026) Pengaruh Kadar Air Terhadap Performa Dielektrik Minyak Mineral, Ester Sintetis, Dan Nanofluid Berbasis Ester. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Transformator membutuhkan sistem isolasi cair yang andal untuk menjaga kontinuitas penyaluran energi listrik. Salah satu faktor yang dapat menurunkan kualitas isolasi cair adalah kandungan air. Penelitian ini bertujuan untuk menganalisis pengaruh kadar air terhadap performa dielektrik pada minyak mineral, ester sintetis MIDEL 7131, dan nanofluid berbasis ester dengan penambahan nanopartikel TiO₂. Sampel dikondisikan pada kadar air 30 ppm dan 50 ppm dengan toleransi ±4 ppm, serta diuji pada suhu 30°C, 45°C, dan 60°C. Pengujian tegangan tembus dilakukan sebanyak 20 kali pada setiap kondisi. Hasil pengujian dari konfigurasi jarak elektroda yang berbeda kemudian dikonversi menjadi tegangan tembus ekuivalen pada jarak elektroda 2,5 mm dan dinyatakan dalam satuan kV. Data dianalisis menggunakan statistik deskriptif, distribusi Weibull, dan Welch’s t-test. Hasil penelitian menunjukkan bahwa peningkatan kadar air dari 30 ppm menjadi 50 ppm menurunkan nilai tegangan tembus pada seluruh jenis minyak. Penurunan terbesar terjadi pada minyak mineral, yaitu 56,97% pada 30°C, 41,82% pada 45°C, dan 35,93% pada 60°C. Pada ester sintetis, penurunan terjadi sebesar 19,19%, 17,39%, dan 20,21%, sedangkan pada nanofluid berbasis ester sebesar 19,20%, 17,01%, dan 15,48%. Secara keseluruhan, nanofluid berbasis ester menunjukkan performa dielektrik terbaik, diikuti oleh ester sintetis dan minyak mineral. Hasil analisis statistik menunjukkan bahwa variasi kandungan air dan suhu memberikan pengaruh signifikan terhadap nilai tegangan tembus minyak isolasi.
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Transformers require reliable liquid insulation systems to maintain the continuity of electrical power transmission. One factor that can reduce the quality of liquid insulation is water content. This study aims to analyze the effect of water content on the dielectric performance of mineral oil, MIDEL 7131 synthetic ester, and an ester-based nanofluid containing TiO₂ nanoparticles. The samples were conditioned at water content levels of 30 ppm and 50 ppm with a tolerance of ±4 ppm and tested at temperatures of 30°C, 45°C, and 60°C. Breakdown voltage tests were conducted 20 times for each condition. Results obtained using different electrode-gap configurations were converted into equivalent breakdown voltage values referenced to a 2.5 mm electrode gap and expressed in kilovolts (kV). The data were analyzed using descriptive statistics, the Weibull distribution, and Welch’s t-test. The results showed that increasing the water content from 30 ppm to 50 ppm reduced the breakdown voltage of all oil types. The greatest reductions occurred in mineral oil, amounting to 56.97% at 30°C, 41.82% at 45°C, and 35.93% at 60°C. In the synthetic ester, the reductions were 19.19%, 17.39%, and 20.21%, respectively, while in the ester-based nanofluid, the reductions were 19.20%, 17.01%, and 15.48%, respectively. Overall, the ester-based nanofluid exhibited the best dielectric performance, followed by the synthetic ester and mineral oil. Statistical analysis indicated that variations in water content and temperature had a significant effect on the breakdown voltage of the insulating oils.

Item Type:	Thesis (Other)
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:	Muhammad Farrel Mahesruri
Date Deposited:	24 Jul 2026 01:54
Last Modified:	24 Jul 2026 06:44
URI:	http://repository.its.ac.id/id/eprint/137001

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