ANALISIS PENGARUH KONSENTRASI GAS TETRAFLOROETANA TERHADAP DIELEKTRIK GAS NITROGEN DALAM MEDAN TINGGI DC NON-HOMOGEN

Authors

  • Rizki Chandra Maulana Jurusan Teknik Elektro Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur
  • Mochammad Dhofir Jurusan Teknik Elektro Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur
  • Hadi Suyono Jurusan Teknik Elektro Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur

Abstract

AbstrakPenelitian ini membahas tentang pengaruh konsentrasi gas tetrafloroetana (R-134) terhadap dielektrik gas nitrogen (N2) dalam medan tinggi dc non-homogen. Pengaruh yang dianalisis yaitu kekuatan dielektrik dan nilai probabilitas tembus. Penelitian ini dilakukan dengan menggunakan variasi kondisi perubahan konsentrasi gas R-134, tekanan total gas campuran, dan jarak sela antar elektroda. Variasi konsentrasi gas R-134 dalam gas N2 adalah 0%, 5%, 10%, 15%, 20%, 25%, dan 30% yang dihitung berdasarkan tekanan total gas campuran. Variasi tekanan total gas campuran adalah 755 mBar, 805 mBar, 855 mBar, 905 mBar, dan 955 mBar. Variasi jarak sela antara kedua elektroda adalah 2 cm dan 4 cm. Selanjutnya dilakukan simulasi distribusi dan perhitungan efisiensi medan listrik menggunakan software FEMM 4.2, sehingga dapat dilakukan perhitungan nilai kekuatan dielektrik. Kemudian dilakukan penentuan nilai probabilitas melalui perhitungan fungsi distribusi kumulatif pada 50 hasil pengujian tembus. Penentuan nilai probabilitas dilakukan pada kondisi variasi konsentrasi gas R-134 dalam gas N2 sebesar 0% dan 30%, tekanan total gas campuran 955 mBar, serta jarak sela 2 cm dan 4 cm. Melalui nilai fungsi distribusi kumulatif pada setiap pengujian, didapatkan probabilitas tembus Ud−5, Ud−50, dan Ud−95 serta dapat digambarkan grafik probabilitas tembus terhadap tegangan tembus. Hasil yang didapatkan dalam penelitian ini yaitu semakin besar nilai konsentrasi gas R-134 yang diberikan, maka semakin meningkat pula nilai kekuatan dielektriknya. Pada konsentrasi gas R-134 yang sama, peningkatan tekanan total gas campuran dan nilai jarak sela juga menyebabkan peningkatan pada nilai kekuatan dielektrik. Selain itu, adanya konsentrasi gas R-134 juga mampu meningkatkan nilai probabilitas tembus dielektrik gas campuran.Kata kunci: isolator gas, kekuatan dielektrik, nitrogen, probabilitas tembus, tetrafloroetana.AbstractThis study discusses the effect of the gas concentration of tetrafluoroethane (R-134) on the dielectric of nitrogen gas (N2) in a non-homogeneous dc high field. The influence analyzed is the dielectric strength and the probability of penetration. This research was carried out using variations in the condition of changes in the concentration of R-134 gas, the total pressure of the mixed gas, and the distance between the electrodes. Variations in the concentration of R-134 gas in N2 gas are 0%, 5%, 10%, 15%, 20%, 25%, and 30% which are calculated based on the total pressure of the mixed gas. The variations in the total pressure of the mixed gas are 755 mBar, 805 mBar, 855 mBar, 905 mBar, and 955 mBar. The variation of the gap between the two electrodes is 2 cm and 4 cm. Furthermore, distribution simulations and calculations of electric field efficiency were carried out using FEMM 4.2 software, so that the dielectric strength values could be calculated. Then the probability value is determined through the calculation of the cumulative distribution function on 50 test results. Determination of the probability value is carried out under conditions of variations in the concentration of R-134 gas in N2 gas of 0% and 30%, the total pressure of the mixed gas is 955 mBar, and the distance between 2 cm and 4 cm. Through the value of the cumulative distribution function in each test, the breakdown probabilities are Ud−5, Ud−50, and Ud−95, and a graph of the breakdown probability against breakdown voltage can be drawn. The results obtained in this study are the greater the concentration of gas R-134 given, the higher the value of the dielectric strength. At the same concentration of R-134 gas, an increase in the total pressure of the mixed gas and the value of the gap also causes an increase in the value of the dielectric strength. In addition, the presence of a gas concentration of R-134 is also able to increase the probability of penetrating the mixed gas dielectric.Keywords: breakdown probability, dielectric strength, gas insulator, nitrogen, tetrafluoroethane

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2022-06-28

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