Date of Publication :15th May 2024

Abstract: Natural ester oil-based nanoparticle dispersed fluids are latest developed oils for insulation purposes in transformers. Different types of nanoparticles have been dispersed in crop extracted oils to synthesize renewable dielectric fluids to replace toxic and non-biodegradable mineral oil. The successful application of developed nanofluids in transformers depends upon the dielectric behavior of these fluids in fresh as well as under thermal ageing conditions. In this research, a crop extracted oil dispersed with graphene oxide nanoparticles has been tested for its dielectric performance before and after being put under thermal ageing conditions. Results have shown that at maximum values, the dielectric breakdown voltage of aged nanofluid samples reduces by 2.7% whereas this reduction is calculated to be 8.4% in the case of base oil samples after ageing. In terms of dielectric constant and loss tangent, the aged nanofluids also perform better as compared to the aged base oil. Moreover, the dispersion of nanoparticles has resulted in a possibility of decrease in the transformer core size by 8.6% as compared to the base oil.

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