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Analysis of High-Frequency Dispersion Characteristics of Capacitance and Loss Factor of Aramid Paper Impregnated with Various Dielectric Liquids

Author

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  • Stefan Wolny

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

Abstract

This paper presents research results of the loss factor of high voltage insulation samples made of aramid paper impregnated with various types of insulating oil. The analysis was carried out in the high frequency domain in the range of 50 Hz to 1 MHz. The experiments were carried out for three impregnation types: mineral oil, synthetic ester and natural ester. The influence of temperature in the range of 20 °C to 100 °C, which is typical when using this type of insulation in power transformers, was taken into account. In addition, the process of influence of initial aging of aramid paper was simulated by heat soaking the samples before their impregnation at a temperature of 250 °C in multiple time intervals. Based on the analyses of dispersion characteristics of insulation sample loss factors, conclusions and recommendations for further diagnostics of aramid-oil insulations using the method described were delineated.

Suggested Citation

  • Stefan Wolny, 2019. "Analysis of High-Frequency Dispersion Characteristics of Capacitance and Loss Factor of Aramid Paper Impregnated with Various Dielectric Liquids," Energies, MDPI, vol. 12(6), pages 1-10, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:6:p:1063-:d:215396
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    Citations

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    Cited by:

    1. Maciej Zdanowski, 2020. "Streaming Electrification of Nycodiel 1255 Synthetic Ester and Trafo EN Mineral Oil Mixtures by Using Rotating Disc Method," Energies, MDPI, vol. 13(23), pages 1-14, November.
    2. Stefan Wolny & Adam Krotowski, 2020. "Analysis of Polarization and Depolarization Currents of Samples of NOMEX ® 910 Cellulose–Aramid Insulation Impregnated with Mineral Oil," Energies, MDPI, vol. 13(22), pages 1-18, November.
    3. Przemyslaw Goscinski & Zbigniew Nadolny & Andrzej Tomczewski & Ryszard Nawrowski & Tomasz Boczar, 2023. "The Influence of Heat Transfer Coefficient α of Insulating Liquids on Power Transformer Cooling Systems," Energies, MDPI, vol. 16(6), pages 1-15, March.

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