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The resistance to partial discharges of pure, microfilled and nanofilled Polyetherimide varnish for low voltage motors fed by inverters is presented. Micro and nano-sized Silica particles (1.5 % wt) are used as fillers. Experimental results of lifetime versus temperature (-55 to 180°C), frequency (5 to 15 kHz) and level of the applied square voltage (+/- 1 kV to +/- 3 kV) clearly demonstrate that...
Results of DC conduction, breakdown strength and electroluminescence of standard (PEI), nanoscale-filled and microscale-filled varnishes are described and analyzed in this communication. Silica (10 nm and 400 nm) has been used as a filler to increase the lifetime of such varnishes submitted to a partial discharge activity (varnish to be used in rotating machines fed by inverters). Experimental results...
Nano-structured polypropylene (PP) materials are investigated resorting to electrical and luminescence measurements, by means of several experimental tools, in order to evaluate their potentiality for application as electrical insulation and to understand the mechanisms of charge trapping relevant to the nano-structuration process. Both matrix compatibilization process and filler content appear as...
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