Experimental Analysis of Convective Heat Transfer Behavior and AC Dielectric Breakdown Voltage of Transformer Oil Including Fe3O4 Nanoparticles

Experimental study of convective heat transfer behavior and the AC dielectric breakdown voltage of nano oil for use in transformers is the main scope of this work. The nano oil containing colloidal magnetic Fe3O4 nanoparticles at different volume concentration and the Nytro Libra oil that is the conventional oil in power transformers has been considered as the base fluid. The convective heat transfer behavior was studied by using an experimental setup in laminar flow regime and under constant heat flux. The AC dielectric breakdown voltage by usingBA100 portable dielectric oil tester according to IEC 60156 was carried out. Results show that nano oil with 23 nanometer size and volume concentration of 0.1% has convective heat transfer coefficient to 4.5% higher than the base oil. The AC dielectric breakdown voltage improved 23.8% for nano oil with volume concentration of 0.1% compared to the base oil. The results of the convective heat transfer coefficient behavior of nano oil were compared with othe researchers.