Influence of Metal oxide and Metalloid Nano Particles on the Dielectric Response of HVDC Cable Nano Dielectric

Influence of nano fillers like MgO, SiO
₂
and clay on the dielectric response of HVDC cable dielectric is investigated. Surface treated metal oxide MgO, metalloid SiO
₂
nanoparticles and nano clay of different concentrations in low density polyethylene was considered for the study. LDPE-nano dielectric was prepared by using Brabender twin screw extruder and thin samples were obtained using hot plate vulcaniser. Electrical & dielectric properties were determined. The study indicated that, inclusion of nano fillers in the LDPE matrix resulted in an increase in contact angle and lower wetting energy of the composite. Surface potential decay was observed to be slow with composites indicating increased resistance to surface charge mobility. The relative permittivity and dielectric loss factor of nano dielectric increase with filler concentration and with decreased frequency. The polarization currents decrease exponentially with time and stabilize much lower than LDPE. The results are presented and discussed.