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Modelling the Effect of Thermal Aging on Transformer Oil Electrical Characteristics Using a Regression Approach

Author

Listed:
  • Sifeddine Abdi

    (LREA, Medea University, Medea 26000, Algeria)

  • Abderrahmane Manu Haddad

    (Advanced High Voltage Engineering Centre, School of Engineering, Cardiff University, Queen’s Buildings, The Parade, Cardiff CF24 3AA, UK)

  • Noureddine Harid

    (APEC Research Centre, Khalifa University, Abu Dhabi 127788, United Arab Emirates)

  • Ahmed Boubakeur

    (LRE, Ecole Nationale Polytechnique, Algiers 16200, Algeria)

Abstract

The effect of thermal aging on the electrical properties of the insulating oil used for transformers has been explored in this experimental work. In particular the dielectric dissipation factor, the resistivity and the breakdown voltage have been measured and correlated. The numerical results predicted by mathematical model and those measured in the laboratory have been compared by using a regression analysis. Experiments on thermal aging were performed on insulating oil (Borak 22, Nynas, Austria) during a period of time of 5000-h at three different temperatures. First, the transformer oil’s dielectric dissipation factor, the resistivity and the breakdown voltage are measured after every 500 h of aging. Then, polynomial and exponential regression expressions are proposed for modelling the oil’s electrical parameters variations with thermal ageing at different aging temperatures and periods. The results show that after thermal aging, the resistivity and the breakdown voltage decrease with thermal aging, however, the dielectric dissipation factor which increases. This trend is similar for all different aging temperatures. The numerical results show close agreement with the measured results for all the samples and all studied properties. The regression model presents strong correlation with high coefficients (>94%).

Suggested Citation

  • Sifeddine Abdi & Abderrahmane Manu Haddad & Noureddine Harid & Ahmed Boubakeur, 2022. "Modelling the Effect of Thermal Aging on Transformer Oil Electrical Characteristics Using a Regression Approach," Energies, MDPI, vol. 16(1), pages 1-12, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:381-:d:1018786
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    References listed on IDEAS

    as
    1. Xiaobo Wang & Chao Tang & Bo Huang & Jian Hao & George Chen, 2018. "Review of Research Progress on the Electrical Properties and Modification of Mineral Insulating Oils Used in Power Transformers," Energies, MDPI, vol. 11(3), pages 1-31, February.
    2. Xiaojing Zhang & Lu Ren & Haichuan Yu & Yang Xu & Qingquan Lei & Xin Li & Baojia Han, 2018. "Dual-Temperature Evaluation of a High-Temperature Insulation System for Liquid-Immersed Transformer," Energies, MDPI, vol. 11(8), pages 1-15, July.
    3. Sifeddine Abdi & Noureddine Harid & Leila Safiddine & Ahmed Boubakeur & Abderrahmane (Manu) Haddad, 2021. "The Correlation of Transformer Oil Electrical Properties with Water Content Using a Regression Approach," Energies, MDPI, vol. 14(8), pages 1-14, April.
    4. Lin Cheng & Yi Jiang & Min Dan & Hao Wen & Yanqing Li & Wei Qin & Jian Hao, 2020. "Effects of Fiber and Copper Particles on Conductivity and Breakdown Characteristics of Natural Ester and Mineral Oil under DC Voltage," Energies, MDPI, vol. 13(7), pages 1-16, April.
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