Preprint Article Version 1 This version is not peer-reviewed

AC Dielectric Strength of Mineral Oil-Based Fe3O4 and Al2O3 Nanofluids

Version 1 : Received: 5 November 2018 / Approved: 6 November 2018 / Online: 6 November 2018 (10:20:49 CET)

How to cite: Khaled, U.; Beroual, A. AC Dielectric Strength of Mineral Oil-Based Fe3O4 and Al2O3 Nanofluids. Preprints 2018, 2018110133 (doi: 10.20944/preprints201811.0133.v1). Khaled, U.; Beroual, A. AC Dielectric Strength of Mineral Oil-Based Fe3O4 and Al2O3 Nanofluids. Preprints 2018, 2018110133 (doi: 10.20944/preprints201811.0133.v1).

Abstract

This paper deals with experimental study of the influence of conductive (Fe3O4) and insulating (Al2O3) nanostructured particles at various concentrations on the dielectric strength of transformer mineral oil. The method of preparation and characterization of these nanofluids (NFs) through the measurements of zeta potential, the real and imaginary parts of dielectric constant as well as the concentration and size of nanoparticles using Scanning Electron Microscope (SEM) images of nanoparticles powders and Dispersive x-ray Spectroscopy (EDS) analysis are presented. Experimental findings reveal that these two types of nanoparticles materials significantly improve AC breakdown voltage and the magnitude of this improvement depends on the concentration, size and nature (material) of nanoparticles. For a given type of nanoparticles, the effect is more marked with the smallest nanoparticles. The conductive nanoparticles offer higher enhancement of dielectric strength compared with insulating nanoparticles based nanofluids. With Fe3O4, the breakdown voltage (BDV) can exceed twice that of mineral oil and it increases by more than 76% with Al2O3. The physicochemical mechanisms implicated in this improvement are discussed.

Subject Areas

AC dielectric strength; insulating oils; mineral oil-based nanofluids; statistical analysis; Weibull distribution; normal distribution

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