Partial discharge characteristics of enamel filled with micro and nano composite of SiO2 and TiO2

Abstract

Partial discharges were in general a consequence of local electrical stress concentrations in the insulation or on the surface of the insulation. A wide group of discharge phenomena such as internal discharges occurring in voids or cavities within solid or liquid dielectrics, surface discharges appearing at the boundary of different insulation materials, corona discharges occurring in gaseous dielectrics in the presence of inhomogeneous fields and continuous impact of discharges in solid dielectrics forming discharge channels were included as partial discharges. It has been observed that the use of nano composites in the matrix of polymeric materials can greatly improve the thermal, mechanical and electrical properties of polymeric nano composites. A nano composite (TiO 2 +SiO 2 ) has been tested as nano filler. The micro particles of TiO 2 and SiO 2 are converted into nano particles with the help of ball mill. Scanning electron microscope (SEM) has been used to augment the particle size of nano composite. These nano composites were mixed with standard (Elmo Luft 1A-FD) enamel with help of ultrasonic vibrator. The partial discharge characteristics of enamel, micro composite (3:1, 1:3, 1:1 of SiO 2 and TiO 2 ) filled enamel and nano composite (3:1, 1:3, 1:1 of SiO 2 and TiO 2 ) filled enamel were detailed and analyzed. The partial discharge measurement was carried out in uniform field electrode configurations. The mixing of nano composites of SiO 2 and TiO 2 taken in the proportion of 1:3 with enamel has a significant improvement in the values of partial discharge inception and extinction voltage by 25% and 35% respectively when compared to the partial discharge inception and extinction voltage of the enamel. Similarly, the enamel filled with micro composites of SiO 2 and TiO 2 taken in the proportion of 1:3 has an increase of 19% and 35% in the values of partial discharge inception and extinction voltage respectively when compared to the partial discharge inception and extinction voltage of the enamel.

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