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Article Dans Une Revue Alexandria Engineering Journal Année : 2020

DC breakdown voltage of natural ester oil-based Fe3O4, Al2O3, and SiO2 nanofluids

Résumé

The research of new insulating liquids having high dielectric strength, good heat transfer, and eco-friendliness is a permanent task for the designers of oil-filled high-voltage equipment. With the development of new energy sources, this equipment must operate under DC. The interest for nanofluids (NFs) is their exceptional cooling property. Recent works showed that the addition of certain nanoparticles (NPs) improves the AC withstand voltage of insulating liquids. This paper investigates the influence of magnetic (Fe3O4) and insulating (Al2O3 and SiO2) NPs on DC breakdown voltage (DC-BDV) of MIDEL 1204 natural ester. The experimental values are analysed using both normal and Weibull probabilistic functions. The 1% and 50% DC-BDVs are also deduced. Experimental findings show that the effect of NPs on DC-BDV depends on both their kind and concentration. However, for the concentration of 0.05 g/L, the DC-BDV decreases irrespective of the type of NP. The best improvements are obtained with 0.2 g/L of Fe3O4 (50 nm) and with 0.3 g/L of Al2O3 (50 nm); these improvements are approximately 10.6% and 9%, respectively. The highest DC-BDV improvement with Al2O3 (13 nm), which is 7.6%, is observed with 0.4 g/L. However, the DC-BDV decreases irrespective of the concentration using SiO2.

Dates et versions

hal-02967655 , version 1 (15-10-2020)

Identifiants

Citer

Usama Khaled, Abderrahmane Beroual. DC breakdown voltage of natural ester oil-based Fe3O4, Al2O3, and SiO2 nanofluids. Alexandria Engineering Journal, 2020, 59 (6), pp.4611-4620. ⟨10.1016/j.aej.2020.08.016⟩. ⟨hal-02967655⟩
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