Pengaruh Kontaminasi Partikel Konduktif Serbuk Besi Terhadap Karakteristik Tegangan Tembus Minyak Mineral Bersirkulasi pada Tegangan DC

Akbar, Muhammad Fadlan (2024) Pengaruh Kontaminasi Partikel Konduktif Serbuk Besi Terhadap Karakteristik Tegangan Tembus Minyak Mineral Bersirkulasi pada Tegangan DC. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Minyak mineral telah banyak dimanfaatkan sebagai media isolasi dalam transformator, dimana fungsinya tak hanya sebagai pendingin, tetapi juga menawarkan kekuatan dielektrik yang cukup tinggi. Akan tetapi, kinerja dielektrik minyak mineral dapat mengalami degradasi, salah satunya akibat kontaminasi partikel konduktif seperti serbuk besi. Pada penelitian ini dilakukan pengujian dan simulasi untuk mengetahui pengaruh kontaminasi serbuk besi terhadap karakteristik elektris minyak mineral pada tegangan DC, dengan kondisi statis dan sirkulasi pada kecepatan 0.3 m/s. Variasi sampel dilakukan pada perbedaan konsentrasi kontaminan serbuk besi. Pengujian tegangan tembus dilakukan untuk mengetahui kekuatan dielektrik minyak mineral terkontaminasi partikel logam. Pengujian per-sampel dilakukan sebanyak 20 kali dengan menaikkan tegangan suplai hingga terjadi kegagalan pada isolasi. Hasil menunjukkan baik dalam kondisi statis maupun sirkulasi, semakin besar kontaminasi partikel besi, maka semakin kecil nilai tegangan tembus yang terukur. Lalu, penambahan gerak sirkulasi menaikkan nilai tegangan tembus dari minyak mineral. Kemudian, simulasi distribusi medan listrik juga dilakukan untuk mengetahui pengaruh serbuk besi dan sirkulasi terhadap medan listrik minyak mineral. Hasil simulasi menunjukkan bahwa peningkatan kontaminasi partikel besi mengakibatkan kenaikan nilai medan listrik di media uji. Namun, penambahan gerak sirkulasi menurunkan nilai medan listrik dari minyak mineral. Lintasan partikel besi juga menjadi satu hal yang disimulasikan, mengingat gerak serbuk besi dapat menginisiasi terjadinya proses kegagalan dielektrik melalui proses discharge antar partikel maupun partikel-elektroda. Hasil menunjukkan bahwa penambahan partikel besi meningkatkan jumlah discharge antara partikel-partikel dan partikel-elektroda, sehingga meningkatkan kemungkinan terjadinya kegagalan dielektrik. Penambahan gerakan sirkulasi akan menghambat perilaku partikel besi untuk melakukan crossing antar elektroda sehingga jumlah discharge dan mengurangi kecenderungan crossing partikel antar elektroda. Hal ini menunjukkan bahwa penambahan gerak sirkulasi akan memperlambat proses kegagalan isolasi dari minyak mineral. Berdasarkan hasil penelitian ini, dapat disimpulkan bahwa penambahan gerakan sirkulasi akan menaikkan nilai tegangan tembus minyak mineral, tetapi penambahan kontaminasi partikel konduktif serbuk besi dapat menurunkan karakteristik tegangan tembus minyak mineral pada tegangan DC.
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Mineral oil has been extensively utilized as an insulating medium in transformers due to its dual role as a coolant and its high dielectric strength. However, the dielectric performance of mineral oil can deteriorate, particularly when it becomes contaminated with conductive particles like iron powder. In this research, a series of tests and simulations were conducted to investigate the impact of iron powder contamination on the electrical properties of mineral oil under static conditions and with circulation at a velocity of 0.3 m/s. Various levels of iron powder contaminants were introduced. Breakdown voltage tests were carried out to assess the dielectric strength of the mineral oil contaminated with metal particles. Each sample underwent 20 tests, with the supply voltage gradually increased until insulation failure occurred. The findings indicate that both under static and circulating conditions, the measured breakdown voltage decreases as the level of iron particle contamination increases. Furthermore, the addition of circulation enhances the breakdown voltage of the mineral oil. Electric field distribution simulations were also conducted to examine the influence of iron filings and circulation on the electric field within the mineral oil. The simulation results demonstrate that an increase in iron particle contamination leads to a higher electric field value within the test medium. However, the introduction of circulation reduces the electric field value of the mineral oil. Additionally, the trajectory of iron particles was simulated, considering the movement of iron powder that can initiate a dielectric failure process through the discharge between the particles and electrodes. The results reveal that the presence of iron particles increases the occurrence of discharge between the particles and the particle electrode, thereby raising the likelihood of dielectric failure. The behavior of iron particles to cross between electrodes is hindered by the introduction of circulation movement, resulting in a decrease in discharge amount and the tendency of particles to cross between electrodes. This indicates that the inclusion of circulation movement effectively retards the insulation failure process of mineral oil. From the findings of this study, it can be inferred that the incorporation of circulation movement enhances the breakdown voltage of mineral oil. However, the presence of iron powder conductive particle contamination can diminish the breakdown voltage characteristics of mineral oil under DC voltage conditions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	breakdown voltage, dc voltage, iron particle contamination, moving mineral oil, kontaminasi partikel besi, minyak mineral bersirkulasi, tegangan dc, tegangan tembus.
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3401 Insulation and insulating materials
Divisions:	Faculty of Electrical Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Fadlan Akbar
Date Deposited:	29 Jul 2024 03:19
Last Modified:	29 Jul 2024 03:19
URI:	http://repository.its.ac.id/id/eprint/109304

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