Abstract
Environmental friendly insulating oils are sought after as an alternative to polychlorinated biphenyls and mineral oil. The ester-based insulating oils are the industry preferred choice as they are fire resistant and non-toxic in nature. They also have moisture tolerance capability and oxidation stability are quite higher in synthetic ester due to its stable chemical structure than seed-based natural ester oil. In this work, attempts were made to develop un-inhibited synthetic-ester-based high dielectric permittivity CaCu3Ti4O12 (CCTO) nanofluids. These nanofluids were investigated for the critical parameters such as AC breakdown voltage, dielectric permittivity, loss tangent, DC resistivity, interfacial tension, viscosity, flash point and acidity properties as per the procedure outlined in IEC and ASTM standards. It has been observed that the addition of nanopowder in un-inhibited oil results decrement in overall critical properties. These results suggest that these un-inhibited ester oils are well suitable for high-voltage transformer application in the present form and the combination of oxidation inhibitor and nanoceramic in the ester oils would give rise to enhanced critical parameters.
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