Abstract
The micro-aluminium trihydrate (ATH) and nano-alumina fillers in the silicone rubber (SR) significantly improve the electrical, thermal and mechanical properties. ATH fillers improved the resistance to the corona ageing and water droplet-initiated erosion. Scanning electron microscopy (SEM) analysis was carried out to understand degradation condition caused due to corona ageing and damage caused due to water droplet-initiated discharges. The inclusion of these fillers significantly altered the surface and bulk charge distribution characteristics of the polymer. A right shift is observed in the trap distribution characteristics. The reduced electric field threshold limit for space charge formation is observed with composites, due to increment in impurities/agglomerations with respect to increment in filler concentration. Performance of composites subjected to polarity reversal is improved on inclusion of nano-filler in addition to micro-filler. The inclusion of fillers enhanced the thermal conductivity and improved significantly thermal stability of the SR composite.
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The Author (R.S) wish to thank Central power research institute, Bangalore for sponsoring the project (NPP/2016/TR/1/27042016) on the study of nanocomposites insulants for power apparatus.
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Vinod, P., Desai, B.M.A., Sarathi, R. et al. Investigation on the thermal properties, space charge and charge trap characteristics of silicone rubber nano–micro composites. Electr Eng 103, 1779–1790 (2021). https://doi.org/10.1007/s00202-020-01195-0
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DOI: https://doi.org/10.1007/s00202-020-01195-0