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The Influence of Nanoparticles’ Conductivity and Charging on Dielectric Properties of Ester Oil Based Nanofluid

Author

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  • Konstantinos N. Koutras

    (High Voltage Laboratory, Department of Electrical & Computer Engineering, University of Patras, 26500 Patras, Greece)

  • Ioannis A. Naxakis

    (High Voltage Laboratory, Department of Electrical & Computer Engineering, University of Patras, 26500 Patras, Greece)

  • Eleftheria C. Pyrgioti

    (High Voltage Laboratory, Department of Electrical & Computer Engineering, University of Patras, 26500 Patras, Greece)

  • Vasilios P. Charalampakos

    (Department of Electrical & Computer Engineering, University of the Peloponnese, 26334 Patras, Greece)

  • Ioannis F. Gonos

    (School of Electrical & Computer Engineering, National Technical University of Athens, 15780 Athens, Greece)

  • Aspasia E. Antonelou

    (Foundation for Research and Technology Hellas, Institute of Chemical Engineering Sciences, 26504 Patras, Greece)

  • Spyros N. Yannopoulos

    (Foundation for Research and Technology Hellas, Institute of Chemical Engineering Sciences, 26504 Patras, Greece)

Abstract

This study addresses the effect of nanoparticles’ conductivity and surface charge on the dielectric performance of insulating nanofluids. Dispersions of alumina and silicon carbide nanoparticles of similar size (~50 nm) and concentration (0.004% w / w ) were prepared in natural ester oil. The stability of the dispersions was explored by dynamic light scattering. AC, positive and negative lightning impulse breakdown voltage, as well as partial discharge inception voltage of the nanofluid samples were measured and compared with the respective properties of the base oil. The obtained results indicate that the addition of SiC nanoparticles can lead to an increase in AC breakdown voltage and also enhance the resistance of the liquid to the appearance of partial discharge. On the other hand, the induction of positive charge from the Al 2 O 3 nanoparticles could be the main factor leading to an improved positive Lightning Impulse Breakdown Voltage and worse performance at negative polarity.

Suggested Citation

  • Konstantinos N. Koutras & Ioannis A. Naxakis & Eleftheria C. Pyrgioti & Vasilios P. Charalampakos & Ioannis F. Gonos & Aspasia E. Antonelou & Spyros N. Yannopoulos, 2020. "The Influence of Nanoparticles’ Conductivity and Charging on Dielectric Properties of Ester Oil Based Nanofluid," Energies, MDPI, vol. 13(24), pages 1-16, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:24:p:6540-:d:460401
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    References listed on IDEAS

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    1. Vasilios P. Charalampakos & Georgios D. Peppas & Eleftheria C. Pyrgioti & Aristides Bakandritsos & Aikaterini D. Polykrati & Ioannis F. Gonos, 2019. "Dielectric Insulation Characteristics of Natural Ester Fluid Modified by Colloidal Iron Oxide Ions and Silica Nanoparticles," Energies, MDPI, vol. 12(17), pages 1-11, August.
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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. Miloš Šárpataky & Juraj Kurimský & Michal Rajňák & Michal Krbal & Marek Adamčák, 2022. "Dielectric Performance of Natural- and Synthetic-Ester-Based Nanofluids with Fullerene Nanoparticles," Energies, MDPI, vol. 16(1), pages 1-15, December.

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