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Liquid dielectrics play a major role in the insulation system used in high voltage equipments. The most commonly used liquid dielectric is transformer oil which serves the dual purpose as insulation and a coolant. It also acts as insulation between the conductingparts and as an arc quenching medium. Moreover the breakdown strength of the paper and the pressboard insulation depends on the properties of the oil in which it is impregnated. Therefore investigations have been attracted towards the development of nano fluids with better thermal and dielectric properties. In this work, ceramic nano particles are chosen because of their electrical insulating property. Because of higher relative permittivity Zirconia(ZrO2) and Titania(TiO2) nano particles are used here. The dielectric and thermal properties are measured for different concentrations of nanofillers. AC and Impulse breakdown voltage measurements were performed as per IS6792:1972 and IS 11697:1986 respectively. The specific resistivity and the dielectric dissipation factor measurement were carried with reference to IS 6103:1971 and IS 6262:1971. The kinematic viscosity and flash point are measured as per IS 1448 Part-25:1970 and IS 1448 Part-21:1970 respectively.

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