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Bubble Effect Phenomenon in Modern Transformer Insulation Systems Using Aramid-Based Materials and Alternative Insulating Liquids

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  • Kamil Lewandowski

    (Institute of Electric Power Engineering, Poznan University of Technology, Piotrowo 3A Str., 61-138 Poznan, Poland
    Power Engineering Transformatory Sp. z o.o., Gdynska 83 Str., 62-004 Czerwonak, Poland)

  • Hubert Moranda

    (Institute of Electric Power Engineering, Poznan University of Technology, Piotrowo 3A Str., 61-138 Poznan, Poland)

  • Radoslaw Szewczyk

    (DuPont Polska Sp. z o.o., Al. Jerozolimskie 93, 02-001 Warszawa, Poland)

Abstract

One of the possible causes of transformer failures is high moisture in the winding insulation system. In an extreme case, when the critical temperature is exceeded, a sudden release of water vapor from the transformer insulation, called the bubble effect, can occur. This article analyzes the initiation temperature of the bubble phenomenon in various solid insulation materials (Kraft cellulose paper and aramid-based high-temperature papers such as Nomex ® 910 and Nomex ® 926) immersed in two electro-insulating liquids (mineral oil and Midel 7131 synthetic ester). The initiation temperature of the bubble effect depends mainly on the moisture content of the solid insulation, but it was found to be slightly lower for high-temperature materials than for cellulose. However, after taking into account the differences related to uneven water absorption of the tested materials, the differences in the initiation temperature of individual solid materials are very small. Synthetic ester, compared to mineral oil, slightly increases the bubble initiation temperature, regardless of the solid material used.

Suggested Citation

  • Kamil Lewandowski & Hubert Moranda & Radoslaw Szewczyk, 2023. "Bubble Effect Phenomenon in Modern Transformer Insulation Systems Using Aramid-Based Materials and Alternative Insulating Liquids," Energies, MDPI, vol. 16(14), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:14:p:5297-:d:1191381
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    References listed on IDEAS

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    1. Saravanakumar Arumugam, 2021. "Failure Diagnosis and Root-Cause Analysis of In-Service and Defective Distribution Transformers," Energies, MDPI, vol. 14(16), pages 1-20, August.
    2. Chunxu Qin & Yan He & Bing Shi & Tao Zhao & Fangcheng Lv & Xiangrui Cheng, 2018. "Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles," Energies, MDPI, vol. 11(3), pages 1-11, March.
    3. Piotr Przybylek & Hubert Moranda & Hanna Moscicka-Grzesiak & Dominika Szczesniak, 2019. "Application of Synthetic Ester for Drying Distribution Transformer Insulation—The Influence of Cellulose Thickness on Drying Efficiency," Energies, MDPI, vol. 12(20), pages 1-16, October.
    4. Piotr Przybylek & Hubert Moranda & Hanna Moscicka-Grzesiak & Mateusz Cybulski, 2020. "Laboratory Model Studies on the Drying Efficiency of Transformer Cellulose Insulation Using Synthetic Ester," Energies, MDPI, vol. 13(13), pages 1-11, July.
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