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

Pawel Zukowski, Przemyslaw Rogalski, Tomasz N. Koltunowicz, Konrad Kierczynski, Jan Subocz and Marek Zenker
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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

Energies, 2020, vol. 13, issue 20, 1-19

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.

Keywords: power transformer; synthetic ester; electrotechnical pressboard; moisture; energy activation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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