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-The polymer nano composite possess good priority recently for engineering applications.Especially the electrical insulating materials attract the high performance of nano composites. In this work the ballmill synthesiation process of nano sized Alumina (Al 2 O 3 ), the preparation of new nano composite material with an content of enamel and synthesized Alumina as 1wt%, 3wt% and 5wt%. Experimental investigation has been carried out for the prepared nano composites materials with respect to dielectric parameter measurements such as dielectric loss (tan δ), dielectric constant (ε), dielectric strength under various temperature. The partial discharge level also measured for all the samples and the PD inception voltage is also observed and compared. Weight loss of the material has been analyzed through TGA. It has been experimentally proved that 3wt% of Alumina nano filler added enamel has significant improvement in the dielectric and thermal properties.

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The coupled field, Magnetic-thermal-structural analysis has been carried out for 230 kV bare and nano Fe coated busbar. The integrated coupled field analytical equations were developed by using electrical parameters to predetermine the temperature rise and mechanical stress. The finite element method software ANSYS APDL commercial package has been used for simulation analysis with magneto-thermal-structural sequential weak coupling methods. The 6061-T6 hollow aluminium busbar size of 1 m length and 8 mm thickness with the load current of 1000 A was modelled and the magnetic field effect was analysed through magnetostatic solver. From the analysis, it was inferred that the nano iron coated busbar diminishes the magnetic field around 80% in the vicinity areas. The magnetic field reduction is achieved by high conductivity and high permeability of the material. It also reduces the rise of temperature by 4 °C with the property of high thermal conductivity, thus reduces the thermal flux by 50 W m−2. Thermal dependent mechanical stress is decreased by 35% for coated conductor compare with the bare conductor. Due to the thermal expansion coefficient, the coated material aid to protect the busbar against the mechanical stress. The simulation results were analyzed and compared with the analytical results. The nano coated conductor exhibit the low electromagnetic pollution in the environment by reducing the electromagnetic field and temperature rise.

In recent days, there was a signi¯cant development in the area of nanoparticles and nanoscalē llers on dielectric, thermal and mechanical properties of polymeric materials. The dielectric and thermal properties of standard polyamide and nanoscale-¯lled samples were detailed and analyzed. Carbon nanotubes were used as nano¯llers. Carbon nanotubes were synthesized by chemical vapor deposition (CVD). The basic properties such as dielectric loss tangent (tan ), dielectric constant ("), dielectric strength, partial discharge inception voltage, surface resistivity, quality factor, phase angle, dielectric conductivity, dielectric power loss and thermal withstand strength of the polyamide enamel¯lled with carbon nanotubes were analyzed and compared with the properties of the standard enamel. The experimental results show that carbon nanotubes mixed with polyamide enamel had better thermal properties when compared to that of standard enamel.

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