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Cellulose Ester Insulation of Power Transformers: Researching the Influence of Moisture on the Phase Shift Angle and Admittance

Author

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  • Pawel Zukowski

    (Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 20-618 Lublin, Poland)

  • Przemyslaw Rogalski

    (Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 20-618 Lublin, Poland)

  • Tomasz N. Koltunowicz

    (Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 20-618 Lublin, Poland)

  • Konrad Kierczynski

    (Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 20-618 Lublin, Poland)

  • Jan Subocz

    (Department of Electrotechnology and Diagnostics, West Pomeranian University of Technology, 70-313 Szczecin, Poland)

  • Marek Zenker

    (Department of Electrotechnology and Diagnostics, West Pomeranian University of Technology, 70-313 Szczecin, Poland)

Abstract

This study investigates the frequency–temperature relations between the phase angle φ and admittance Y for composites of cellulose, synthetic ester, and water nanoparticles. We determined the activation energy value for the relaxation time of a phase shift angle Δ W φ ≈ (0.783 ± 0.0744) eV, which was related to the shift of φ( f ) waveforms in higher frequency area with increasing temperature. We found that the position of admittance frequency waveforms in double logarithmic coordinates was simultaneously influenced by the temperature dependence of admittance and its relaxation time. Activation energy values for the relaxation time of admittance Δ W τ ≈ (0.796 ± 0.0139) eV and the activation energy value of admittance ∆ W Y ≈ (0.800 ± 0.0162) eV were determined. It was found that all three activation energy values were identical and their average was Δ W ≈ (0.793 ± 0.0453) eV. Impregnation with synthetic ester resulted in a decrease of activation energy by 0.26 eV compared to the impregnation with insulating oil. This was related to higher dielectric permittivity of the synthetic ester.

Suggested Citation

  • Pawel Zukowski & Przemyslaw Rogalski & Tomasz N. Koltunowicz & Konrad Kierczynski & Jan Subocz & Marek Zenker, 2020. "Cellulose Ester Insulation of Power Transformers: Researching the Influence of Moisture on the Phase Shift Angle and Admittance," Energies, MDPI, vol. 13(20), pages 1-19, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5511-:d:432172
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    Citations

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    Cited by:

    1. Pawel Zukowski & Przemyslaw Rogalski & Konrad Kierczynski & Tomasz N. Koltunowicz, 2021. "Precise Measurements of the Temperature Influence on the Complex Permittivity of Power Transformers Moistened Paper-Oil Insulation," Energies, MDPI, vol. 14(18), pages 1-24, September.
    2. Pawel Zukowski & Przemyslaw Rogalski & Tomasz N. Koltunowicz & Konrad Kierczynski & Vitalii Bondariev, 2020. "Precise Measurements of the Temperature-Frequency Dependence of the Conductivity of Cellulose—Insulating Oil—Water Nanoparticles Composite," Energies, MDPI, vol. 14(1), pages 1-26, December.
    3. 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.
    4. Pawel Zukowski & Przemyslaw Rogalski & Vitalii Bondariev & Milan Sebok, 2022. "Diagnostics of High Water Content Paper-Oil Transformer Insulation Based on the Temperature and Frequency Dependencies of the Loss Tangent," Energies, MDPI, vol. 15(8), pages 1-16, April.
    5. Tomasz N. Kołtunowicz & Konrad Kierczynski & Pawel Okal & Aleksy Patryn & Miroslav Gutten, 2022. "Diagnostics on the Basis of the Frequency-Temperature Dependences of the Loss Angle Tangent of Heavily Moistured Oil-Impregnated Pressboard," Energies, MDPI, vol. 15(8), pages 1-14, April.

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