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Analysis of Polarization and Depolarization Currents of Samples of NOMEX ® 910 Cellulose–Aramid Insulation Impregnated with Synthetic Ester

Author

Listed:
  • Adam Krotowski

    (Faculty of Electrical Engineering, Automatic Control and Computer Science, Opole University of Technology, Proszkowska 76 B2, 45-758 Opole, Poland)

  • Stefan Wolny

    (Faculty of Electrical Engineering, Automatic Control and Computer Science, Opole University of Technology, Proszkowska 76 B2, 45-758 Opole, Poland)

Abstract

The paper presents the results of laboratory tests regarding the impact of accelerated thermal ageing of cellulose–aramid insulation samples saturated with electrical-insulating synthetic ester on the polarization and depolarization current characteristics being analyzed in the time domain. In the tests, electro-technical paper from DuPont TM was used, commercially designated as NOMEX ® 910. Laboratory-accelerated ageing consisted of heating with air a supply of samples of not-impregnated cellulose–aramid insulation for a specified time at specified temperatures. The temperatures and the warming time were selected so as to faithfully represent the degree of the thermal degradation of the cellulose fibers that takes place during normal operation of the material in power transformers. To determine the described impact of the ageing process in the insulation samples on the dielectric properties, the Polarization and Depolarization Method was applied. In the measurements, the MIC-15k1 high resistance meter from SONEL S.A. was used.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:9:p:3107-:d:801039
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    References listed on IDEAS

    as
    1. 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.
    2. Grzegorz Dombek & Zbigniew Nadolny & Piotr Przybylek & Radoslaw Lopatkiewicz & Agnieszka Marcinkowska & Lukasz Druzynski & Tomasz Boczar & Andrzej Tomczewski, 2020. "Effect of Moisture on the Thermal Conductivity of Cellulose and Aramid Paper Impregnated with Various Dielectric Liquids," Energies, MDPI, vol. 13(17), pages 1-17, August.
    3. 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.
    4. Abi Munajad & Cahyo Subroto & Suwarno, 2017. "Study on the Effects of Thermal Aging on Insulating Paper for High Voltage Transformer Composite with Natural Ester from Palm Oil Using Fourier Transform Infrared Spectroscopy (FTIR) and Energy Disper," Energies, MDPI, vol. 10(11), pages 1-15, November.
    5. Maciej Zdanowski, 2020. "Streaming Electrification Phenomenon of Electrical Insulating Oils for Power Transformers," Energies, MDPI, vol. 13(12), pages 1-12, June.
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