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This paper presents a current measurement setup to determine polarization and conduction processes of solid insulation materials under HVDC stress. The setup enables simultaneous polarization, depolarization, and conduction current measurements of up to four material samples. The volume or surface current measurements are performed in a pressure vessel, adjustable to the whole range of possible long-term...
Results of DC breakdown strength of pure, nanoscale-filled and microscale-filled PEI varnishes are described and analyzed in this communication. Silica (10nm and 400nm) 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 have shown that both dielectric strength...
The present work aims at studying the cooling performance of a thermoelectric device that integrated with integrated heat spreader (IHS) on a flip-chip plastic ball grid array (FC-PBGA) package. The new thermoelectric device herein is fabricated on the metal substrates by flip-chip assembly process. Thermal performance of the new package was comprehensive studied. The thermal resistances of IHS with/without...
As the shape and the size of a void in a insulation system affect considerably the progress of the deterioration of the insulation performance if partial discharges (PD's) occur in the void, it is important to estimate both of the two parameters. Conventional PD characteristics are however ineffective to estimate the shape of a void. Therefore the relationship between the shape of a cylindrical void...
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