Volume 1, Issue 2
International Journal of Science and Engineering Applications (IJSEA)
Volume 1, Issue 2 - December 2012
Partial discharge characteristics of enamel filled with micro and nano composite of SiO2 and TiO2
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 (TiO2+SiO2) has been tested as nano filler. The micro particles of TiO2 and SiO2 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 SiO2 and TiO2) filled enamel and nano composite (3:1, 1:3, 1:1 of SiO2 and TiO2) filled enamel were detailed and analyzed. The partial discharge measurement was carried out in uniform field electrode configurations. The mixing of nano composites of SiO2 and TiO2 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 SiO2 and TiO2 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.
Keywords: Partial discharge inception voltage, Partial discharge extinction voltage, Ball Mill, SiO₂, TiO₂, Scanning electron microscopy.
 C. Pugazhendhi Sugumaran, M.R.Mohan and K.Udayakumar, “Investigation of Dielectric and Thermal Properties of Nano-filler (ZrO2) Mixed Enamel”, IEEE Transaction on Dielectrics and Electrical Insulation: Vol.17, No.6, 2010.
 Hulya Kirkici, Mert Serkan, K.Koppisetty, “Nano-dielectric Materials in Electrical Insulation Application”, IEEE, 2005.
 Takahiro Imai, Gen Komiya, Kiyoko Murayama, Tamon Ozaki, “Improving Epoxy-based Insulating Materials with Nano-fillers toward Practical Application”, IEEE 2008.
 Guoqin Zhang, Guangning Wu, Laisheng Tong, Enguang, “ Study of Nano TiO2 Filler in the Corona - resistant Magnetic Wire Insulation Performance of Inverter-fed Motor”, Proceedings of international Symposium on Electrical Insulating Materials, June 5-9, 2005, Kitakyushu, Japan A3-8, 2005.
 Edison Selvaraj. D, Pugazhendhi Sugumaran. C and SivaPrakash. A, “Characterization of Electrical and Thermal Properties of Enamel Filled with Carbon Nanotubes”, PEIE 2012, LNEE, pp. 496-502, 2012