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Influence of Dielectric Liquid Type on Partial-Discharge Inception Voltage in Oil-Wedge-Type Insulating System under AC Stress

Author

Listed:
  • Bartlomiej Pasternak

    (Institute of Electrical Power Engineering, Lodz University of Technology, 90-537 Lodz, Poland
    Interdisciplinary Doctoral School, Lodz University of Technology, 90-543 Lodz, Poland)

  • Pawel Rozga

    (Institute of Electrical Power Engineering, Lodz University of Technology, 90-537 Lodz, Poland)

Abstract

This article describes the results of laboratory tests on an oil-wedge-type electrode system, which were supplemented by FEM (finite element method) simulations. The studies were focused on the comparison of the partial-discharge inception voltage (PDIV) in the abovementioned system when immersed in different liquid dielectrics, namely inhibited mineral oil, uninhibited mineral oil, synthetic ester, and natural ester. In addition, the electric field stress obtained from the simulations was used in each case to determine the safe level for the actual transformer insulation. The studies were performed under AC voltage. Both electrical and optical detection methods were applied in order to properly determine the discharge inception. The statistical analysis of the results obtained from the laboratory measurements was carried out using Weibull distribution. We found that both mineral oils demonstrated better properties than the ester liquids in terms of resistance against partial-discharge appearance under the conditions of the oil-wedge-type electrode model. Therefore, for all considered cases, the inception electric field stress obtained from the FEM-based simulations corresponding to the partial-discharge inception voltage was found to be significantly higher than the commonly accepted safe design level, which is in the range of 10–12 kV/mm. This proved the good electrical strength of all liquids under test.

Suggested Citation

  • Bartlomiej Pasternak & Pawel Rozga, 2023. "Influence of Dielectric Liquid Type on Partial-Discharge Inception Voltage in Oil-Wedge-Type Insulating System under AC Stress," Energies, MDPI, vol. 16(2), pages 1-11, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:2:p:1005-:d:1037924
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    References listed on IDEAS

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    1. Marek Florkowski & Maciej Kuniewski & Paweł Zydroń, 2022. "Measurements and Analysis of Partial Discharges at HVDC Voltage with AC Components," Energies, MDPI, vol. 15(7), pages 1-11, March.
    2. Shen, Zijia & Wang, Feipeng & Wang, Zhiqing & Li, Jian, 2021. "A critical review of plant-based insulating fluids for transformer: 30-year development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    3. Abderrahmane Beroual & Usama Khaled & Phanuel Seraphine Mbolo Noah & Henry Sitorus, 2017. "Comparative Study of Breakdown Voltage of Mineral, Synthetic and Natural Oils and Based Mineral Oil Mixtures under AC and DC Voltages," Energies, MDPI, vol. 10(4), pages 1-17, April.
    4. Fatih Atalar & Aysel Ersoy & Pawel Rozga, 2022. "Investigation of Effects of Different High Voltage Types on Dielectric Strength of Insulating Liquids," Energies, MDPI, vol. 15(21), pages 1-25, October.
    5. Pawel Rozga & Abderrahmane Beroual & Piotr Przybylek & Maciej Jaroszewski & Konrad Strzelecki, 2020. "A Review on Synthetic Ester Liquids for Transformer Applications," Energies, MDPI, vol. 13(23), pages 1-33, December.
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