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Streaming Electrification of Different Insulating Fluids in Power Transformers

Author

Listed:
  • Arputhasamy Joseph Amalanathan

    (Department of High Voltage Engineering, Faculty of Electrical Engineering and Informatics, University of Applied Sciences, 02763 Zittau, Germany)

  • Maciej Zdanowski

    (Department of Electric Power Engineering and Renewable Energy, Faculty of Electrical Engineering, Automatic Control and Computer Science, Opole University of Technology, Prószkowska 76, 45-758 Opole, Poland)

  • Ramanujam Sarathi

    (Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India)

Abstract

This paper presents a detailed review of the streaming electrification phenomena of different insulating fluids for power transformers. The comparison of different techniques used to assess the charging tendency of fluids is discussed depending on the flow type (planar or centrifugal), volume of oil, and interface material. The charge separation between the insulating fluid and metallic/pressboard interfaces is explained in terms of the electrical double layer formation involving a fixed layer and diffuse layer. Based on the experimental results, the streaming electrification is observed to be a function of various factors such as speed, temperature, electric field, and surface roughness. Depending on the molecular structure of insulating liquids that come into contact with solid insulation at the interface, the streaming current can increase; hence, a suitable additive (benzotriazole, fullerene, Irgamet 39) is selected based on the type of fluid and charge polarity. The degradation of the insulating liquid upon ageing, which increases the streaming current and reclamation of such aged fluids using adsorbents (Fuller’s earth, activated carbon, bentonite, and alumina), is a possible method to suppress the static current through improving its dielectric properties. The nanofluids show a higher streaming current compared to base fluid with no change observed even after the reclamation process. The energization process using alternating current (AC) and direct current (DC) impacts the streaming phenomenon depending on its magnitude and polarity. The diffusion of sulfur compounds in the insulating liquid is another major hazard to transformers because the sulfide ions affect the physio-chemical reaction at the interface material, which is responsible for the formation of streaming current.

Suggested Citation

  • 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.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:8121-:d:959364
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    References listed on IDEAS

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    1. Maciej Zdanowski, 2020. "Electrostatic Charging Tendency Analysis Concerning Retrofilling Power Transformers with Envirotemp FR3 Natural Ester," Energies, MDPI, vol. 13(17), pages 1-11, August.
    2. Maciej Zdanowski, 2020. "Streaming Electrification of Nycodiel 1255 Synthetic Ester and Trafo EN Mineral Oil Mixtures by Using Rotating Disc Method," Energies, MDPI, vol. 13(23), pages 1-14, November.
    3. Janvier Sylvestre N’cho & Issouf Fofana & Yazid Hadjadj & Abderrahmane Beroual, 2016. "Review of Physicochemical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers," Energies, MDPI, vol. 9(5), pages 1-29, May.
    4. Raymon Antony Raj & Ravi Samikannu & Abid Yahya & Modisa Mosalaosi, 2021. "Investigation of Survival/Hazard Rate of Natural Ester Treated with Al 2 O 3 Nanoparticle for Power Transformer Liquid Dielectric," Energies, MDPI, vol. 14(5), pages 1-25, March.
    5. 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.
    6. Maciej Zdanowski, 2022. "Streaming Electrification of C 60 Fullerene Doped Insulating Liquids for Power Transformers Applications," Energies, MDPI, vol. 15(7), pages 1-14, March.
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    Cited by:

    1. Arputhasamy Joseph Amalanathan & Ramanujam Sarathi & Maciej Zdanowski, 2023. "A Critical Overview of the Impact of Nanoparticles in Ester Fluid for Power Transformers," Energies, MDPI, vol. 16(9), pages 1-24, April.
    2. Zbigniew Nadolny, 2023. "Design and Optimization of Power Transformer Diagnostics," Energies, MDPI, vol. 16(18), pages 1-7, September.

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