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Investigation of Effects of Different High Voltage Types on Dielectric Strength of Insulating Liquids

Author

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  • Fatih Atalar

    (Department of Electrical and Electronic Engineering, Istanbul University-Cerrahpaşa, 34320 Istanbul, Turkey)

  • Aysel Ersoy

    (Department of Electrical and Electronic Engineering, Istanbul University-Cerrahpaşa, 34320 Istanbul, Turkey)

  • Pawel Rozga

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

Abstract

Liquid dielectrics are different from each other, but are used to perform the same tasks in high-voltage electrical equipment, especially transformers. In similar conditions, the insulation performance of transformer oils under different types of voltage will provide dielectric resistance. In this study, three different dielectric liquids applied in transformers, namely mineral oil, natural ester and synthetic ester, were tested. Tests under AC and negative DC voltage were performed at electrode gaps of 2.5 mm, 2 mm and 1 mm using disk and VDE type electrodes as per ASTM D1816-84A and ASTM D877-87 standards, respectively. In turn, the impulse voltage tests were performed under an electrode configuration suggested by the IEC 60897 standard. The current data of 500 ms prior to breakdown under AC electrical field stress was decomposed using the empirical mode decomposition (EMD) and variational mode decomposition (VMD) methods. These analyses were conducted before the full electrical breakdown. Although synthetic ester has the highest dielectric strength under AC and negative DC electrical field stress, mineral oil has been assessed to be the most resistant liquid dielectric at lightning impulse voltages. In addition, stabilization of mineral oil under AC and negative DC voltage was also seen to be good with the help of calculated standard deviation values. However, synthetic ester has a significant advantage, especially in terms of dielectric performance, over mineral oil in spite of the stability of mineral oil. This indicates that liquid dielectric selection for transformers must be carried out as a combined evaluation of multiple parameters.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:8116-:d:959204
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    References listed on IDEAS

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    7. Tomasz Piotrowski & Pawel Rozga & Ryszard Kozak, 2019. "Comparative Analysis of the Results of Diagnostic Measurements with an Internal Inspection of Oil-Filled Power Transformers," Energies, MDPI, vol. 12(11), pages 1-18, June.
    8. 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.
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