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Study on the Influence of Temperature, Moisture and Electric Field on the Electrical Conductivity of Oil-Impregnated Pressboard

Author

Listed:
  • Yuan Li

    (College of Electrical Engineering, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China)

  • Kai Zhou

    (College of Electrical Engineering, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China)

  • Guangya Zhu

    (College of Electrical Engineering, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China)

  • Mingzhi Li

    (College of Electrical Engineering, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China)

  • Shiyu Li

    (College of Electrical Engineering, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China)

  • Jiangong Zhang

    (State Key Laboratory of Power Grid Environmental Protection, Wuhan 430074, China)

Abstract

The main insulation of converter transformers consists of transformer oil and oil-impregnated pressboard. Under operating conditions, the valve-side winding of the converter transformer is subject to DC voltage components. Therefore, studies on the characteristics of oil-impregnated pressboard conductivity are necessary. In this paper, the temperature, moisture and electric field dependency of pressboard conductivity are investigated based on a specially designed three-electrode experimental chamber, which allows for a variation in temperature ranging from 25 °C to 120 °C and an electric field strength ranging from 0 to 30 kV/mm. The experimental results show that, within the experimental conditions, the conductivity of oil-impregnated pressboard increases exponentially with increasing moisture and temperature. High moisture and temperature will increase both the carrier concentration and carrier mobility, which explains the exponential correspondence. Furthermore, the electric field dependency of the conductivity is more obvious for wet pressboard than for dry pressboard. Protons in the wet pressboard are more easily accelerated by the electric field than the impurity ions in the oil of the dry pressboard, which leads to an obvious electric field dependency of the wet pressboard conductivity.

Suggested Citation

  • Yuan Li & Kai Zhou & Guangya Zhu & Mingzhi Li & Shiyu Li & Jiangong Zhang, 2019. "Study on the Influence of Temperature, Moisture and Electric Field on the Electrical Conductivity of Oil-Impregnated Pressboard," Energies, MDPI, vol. 12(16), pages 1-13, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:16:p:3136-:d:257873
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    Citations

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    Cited by:

    1. 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.
    2. Chengjie Zhang & Yuan Li & Senhong Yang & Ranran Li, 2023. "Study on Development Characteristics of Partial Discharge in Oil-Pressboard Insulation under Constant DC Voltage," Energies, MDPI, vol. 16(10), pages 1-14, May.
    3. Piotr Przybylek & Hubert Moranda & Hanna Moscicka-Grzesiak & Dominika Szczesniak, 2019. "Application of Synthetic Ester for Drying Distribution Transformer Insulation—The Influence of Cellulose Thickness on Drying Efficiency," Energies, MDPI, vol. 12(20), pages 1-16, October.
    4. Pawel Zukowski & Przemyslaw Rogalski & Tomasz N. Kołtunowicz & Konrad Kierczynski & Marek Zenker & Alexander D. Pogrebnjak & Matej Kucera, 2022. "DC and AC Tests of Moisture Electrical Pressboard Impregnated with Mineral Oil or Synthetic Ester—Determination of Water Status in Power Transformer Insulation," Energies, MDPI, vol. 15(8), pages 1-16, April.

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