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Effect of Oil Regeneration on Improving Paper Conditions in a Distribution Transformer

Author

Listed:
  • Qiang Liu

    (School of Electrical and Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK)

  • Ramamoorthi Venkatasubramanian

    (School of Electrical and Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK)

  • Shanika Matharage

    (School of Electrical and Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK)

  • Zhongdong Wang

    (School of Electrical and Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK)

Abstract

Managing a large fleet of ageing assets has become a technical challenge faced by many electricity utilities in developed countries. Asset managers are increasingly interested in techniques that can help extend the useful lifetime of a transformer. Oil regeneration is one of such techniques. In this paper, oil regeneration experiments were performed on a 6.4/0.4 kV retired distribution transformer to investigate the effect of oil regeneration on improving paper conditions. Oil regeneration was conducted in two stages, with the first stage aimed at ‘cleaning the oil’ and the second stage targeted at ‘cleaning the paper’. Oil samples were collected at regular intervals throughout the process and paper samples were obtained from the transformer before and after each oil regeneration stage. It was found that oil regeneration restores oil parameters, including moisture and acidity, similar to those of new oils at the end of stage 1. Analysis of paper samples indicated a reduction in paper moisture at the end of stage 2 by nearly 40%, while low molecular weight acids (LMA) in paper exhibited a reduction by around 30% on average. It is found that the extended oil regeneration period, i.e., stage 2, is necessary to improve the paper condition and hence to reduce the paper ageing rate.

Suggested Citation

  • Qiang Liu & Ramamoorthi Venkatasubramanian & Shanika Matharage & Zhongdong Wang, 2019. "Effect of Oil Regeneration on Improving Paper Conditions in a Distribution Transformer," Energies, MDPI, vol. 12(9), pages 1-13, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1665-:d:227637
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    References listed on IDEAS

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    1. Leila Safiddine & Hadj-Ziane Zafour & Ungarala Mohan Rao & Issouf Fofana, 2019. "Regeneration of Transformer Insulating Fluids Using Membrane Separation Technology," Energies, MDPI, vol. 12(3), pages 1-13, January.
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    Cited by:

    1. Arputhasamy Joseph Amalanathan & Maciej Zdanowski & Ramanujam Sarathi, 2022. "Streaming Electrification of Different Insulating Fluids in Power Transformers," Energies, MDPI, vol. 15(21), pages 1-20, October.
    2. 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.
    3. Ramsey Jadim & Mirka Kans & Jesko Schulte & Mohammed Alhattab & May Alhendi & Ali Bushehry, 2021. "On Approaching Relevant Cost-Effective Sustainable Maintenance of Mineral Oil-Filled Electrical Transformers," Energies, MDPI, vol. 14(12), pages 1-17, June.

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