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Thermally Accelerated Aging of Insulation Paper for Transformers with Different Insulating Liquids

Author

Listed:
  • Tobias Münster

    (Division of High Voltage Engineering and Asset Management, Institute of Electrical Power Systems, Leibniz Universität Hannover, 30167 Hannover, Germany)

  • Peter Werle

    (Division of High Voltage Engineering and Asset Management, Institute of Electrical Power Systems, Leibniz Universität Hannover, 30167 Hannover, Germany)

  • Kai Hämel

    (GRIDINSPECT GmbH, Mühlhof 3a, 36325 Feldatal, Germany)

  • Jörg Preusel

    (GRIDINSPECT GmbH, Mühlhof 3a, 36325 Feldatal, Germany)

Abstract

The article presents issues related to the aging behavior of oil-paper insulations in transformers using different oil- and ester-based insulating fluids. Despite numerous conducted studies on the subject of oil-paper aging, the use of new insulating fluids is creating open questions. In addition, new liquids such as synthetic and natural esters, as well as oil of the newest generation, are being used. Furthermore, there is still little research on the formation of aging markers with this form of the dielectric. For this reason, in this contribution, oil-paper insulations with mineral oil-based insulating fluids, natural and synthetic esters, as well as oil from natural gas, are aged thermally accelerated at 130 °C over a duration of 15 weeks, by considering two cases of free-breathing and hermetically sealed transformers. Therefore, various aging markers are investigated to allow a condition assessment. The results show that differences exist between the fluids and design of the transformer, as in the aging rate of the paper and the formation of aging markers in the insulating liquid such as acids. These findings can be used to improve asset management strategies by a more precise determination of the aging state depending on the transformer type as well as the type of insulating fluid.

Suggested Citation

  • Tobias Münster & Peter Werle & Kai Hämel & Jörg Preusel, 2021. "Thermally Accelerated Aging of Insulation Paper for Transformers with Different Insulating Liquids," Energies, MDPI, vol. 14(11), pages 1-28, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:3036-:d:561052
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    References listed on IDEAS

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    1. Kakou D. Kouassi & Issouf Fofana & Ladji Cissé & Yazid Hadjadj & Kouba M. Lucia Yapi & K. Ambroise Diby, 2018. "Impact of Low Molecular Weight Acids on Oil Impregnated Paper Insulation Degradation," Energies, MDPI, vol. 11(6), pages 1-13, June.
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    Cited by:

    1. Piotr Przybylek & Jaroslaw Gielniak, 2023. "The Use of Methanol Vapour for Effective Drying of Cellulose Insulation," Energies, MDPI, vol. 16(11), pages 1-11, May.
    2. Inmaculada Fernández, 2022. "The Need for Experimental and Numerical Analyses of Thermal Ageing in Power Transformers," Energies, MDPI, vol. 15(17), pages 1-4, September.
    3. Teresa Nogueira & José Carvalho & José Magano, 2022. "Eco-Friendly Ester Fluid for Power Transformers versus Mineral Oil: Design Considerations," Energies, MDPI, vol. 15(15), pages 1-18, July.
    4. Adam Krotowski & Stefan Wolny, 2022. "Analysis of Polarization and Depolarization Currents of Samples of NOMEX ® 910 Cellulose–Aramid Insulation Impregnated with Synthetic Ester," Energies, MDPI, vol. 15(9), pages 1-15, April.

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