Influence of nano-oil preparation conditions on its electrical strength

Abstract

This study presents the results of experiments aimed at determining the breakdown voltage of liquids containing carbon nanotubes and other microinclusions; which were dispersed in mineral insulating oil used in electrical transformers. The liquid was obtained by various methods with the mandatory use of ultrasonic dispersant. The electrical strength of the carbon nanotube-based nano-oil was found to be significantly less than the electrical strength of the zinc and titanium nano-oxide-based nano-oil. At low concentrations the values of electrical strength approximately correspond to the values of electrical strength of pure liquid; but with increasing concentration the electrical strength of all nanofluids decreases. It is shown that the nanofluid preparation technology has a strong influence on its breakdown voltage.