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access icon free Multiple nanoparticles for improvement of thermal and dielectric properties of oil nanofluids

  • Author(s): Diaa-Eldin A. Mansour 1 ; Essam M. Shaalan 2 ; Sayed A. Ward 2 ; Adel Z. El Dein 3 ; Hesham S. Karaman 2 ; Hanaa M. Ahmed 4
    • View affiliations
  • Source: Volume 13, Issue 7, September 2019, p. 968 – 974
    DOI:  10.1049/iet-smt.2018.5015 , Print ISSN 1751-8822, Online ISSN 1751-8830
© The Institution of Engineering and Technology
Received 27/02/2018, Accepted 04/04/2019, Revised 06/01/2019, Published 12/04/2019

To improve the performance and increase the lifetime of oil-filled transformers, the thermal and dielectric properties of the transformer oil should be enhanced. Recently, nanotechnology was used as an effective science in the field of transformer oil development. In this study, barium titanate (BT) nanoparticles were inserted into the base transformer oil by a concentration of 0.005 g/L as an individual nanofluid sample (INFS). This insertion enhances the heat transfer coefficient by 33% but the breakdown voltage (BDV) was decreased by >10%. To overcome this problem of dielectric properties degradation, other three hybrid nanofluid samples (HNFS) were prepared using three different types of metal oxide (MO) nanoparticles; titania, alumina, and silica. These samples were prepared by adding a concentration 0.01 g/L of MO nanoparticles together with 0.005 g/L of BT nanoparticles into the oil. The thermal and dielectric properties of HNFS were measured to study the behaviour of nanoparticles hybridisation on transformer oil properties. HNFS using titania nanoparticles provided the best composition regarding either BDV or heat transfer coefficient. Dynamic light scattering (DLS) technique was used to evaluate the particle size distribution of hybrid nanoparticles and to clarify the corresponding physical mechanisms behind the obtained enhancement.

Inspec keywords: alumina; power transformer insulation; electric breakdown; titanium compounds; heat transfer; dielectric properties; light scattering; particle size; transformer oil; nanoparticles; barium compounds

Other keywords: hybrid nanofluids samples; hybrid nanoparticles; particle size distribution; BT nanoparticles; SiO2; oil nanofluids; heat transfer coefficient; dynamic light scattering; transformer oil development; breakdown voltage; metal oxide nanoparticles; transformer oil properties; barium titanate nanoparticles; titania nanoparticles; Al2O3; TiO2; oil-filled transformers; thermal properties; BaTiO3; silica; dielectric properties degradation; HNFS; alumina; multiple nanoparticles; nanoparticles hybridisation

Subjects: Transformers and reactors; Organic insulation; Dielectric breakdown and discharges

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