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Comprehensive Assessment of Transformer Oil After Thermal Aging: Modeling for Simultaneous Evaluation of Electrical and Chemical Characteristics

Author

Listed:
  • Sifeddine Abdi

    (LREA Laboratory of Research in Electrotechnic and Automations, Medea University, Medea 26000, Algeria)

  • Noureddine Harid

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

  • Besseri Boubaker Achraf

    (LREA Laboratory of Research in Electrotechnic and Automations, Medea University, Medea 26000, Algeria)

  • Abderrahmane (Manu) Haddad

    (Advanced High Voltage Engineering Centre, School of Engineering, Cardiff University, Cardiff CF24 3AA, Wales, UK)

  • Ahmed Boubakeur

    (LRE Laboratoire de Recherche en Electrotechnique, Ecole Nationale Polytechnique, Algiers 16200, Algeria)

Abstract

This paper reports the results of an experimental study that examines the impact of thermal aging on the electrical and chemical properties of insulating oil used in power transformers. Transformer-oil samples were thermally aged over a 5000 h period at different temperatures varying between 80 °C and 140 °C, replicating both normal and extreme operating conditions. Measurements of breakdown voltage, dielectric dissipation factor, acidity, and water content were taken at 500 h intervals. A novel approach of this research is the integration of these electrical and chemical characteristics into a comprehensive exponential regression analysis model. The results indicate that breakdown voltage and resistivity decrease with aging time, whereas the dielectric dissipation factor, acidity, and water content increase with aging time. The degradation trends computed by the proposed model show close correlation with both electrical and chemical properties, with correlation coefficients generally equal to or exceeding 90%, which demonstrates its reliability in predicting aging behavior of transformer oil. This integrated approach offers valuable insights into the combined electrical and chemical degradation processes due to thermal aging and assists in the condition assessment of power transformers.

Suggested Citation

  • Sifeddine Abdi & Noureddine Harid & Besseri Boubaker Achraf & Abderrahmane (Manu) Haddad & Ahmed Boubakeur, 2025. "Comprehensive Assessment of Transformer Oil After Thermal Aging: Modeling for Simultaneous Evaluation of Electrical and Chemical Characteristics," Energies, MDPI, vol. 18(8), pages 1-16, April.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:8:p:1915-:d:1631203
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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. 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.
    3. 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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