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http://dx.doi.org/10.4313/TEEM.2012.13.4.200

AC Electrical Breakdown Characteristics of an Epoxy/Mica Composite  

Park, Jae-Jun (Department of Electrical and Electronic Engineering, Joongbu University)
Publication Information
Transactions on Electrical and Electronic Materials / v.13, no.4, 2012 , pp. 200-203 More about this Journal
Abstract
Epoxy/mica composite was synthesized, in order to use it as an impregnation resin in a vacuum pressure impregnation (VPI) process, for manufacturing a high voltage rotary machine. The average particle size of the mica was 5~7 ${\mu}m$ and its content was 0, 20, 30 and 40 wt%. A plasticizer or a low molecular aliphatic epoxy was also used, to decrease the viscosity of the composite. The AC electrical breakdown strength was estimated in sphere-to-sphere electrodes, and the electrical breakdown data were estimated by Weibull statistical analysis. The electrical breakdown strength became higher with the addition of mica; and that of the system with 20 wt% mica was highest. The electrical breakdown strength of the system with an aliphatic epoxy was higher than that of the system with a, plasticizer.
Keywords
Electrical breakdown strength; Mica; Epoxy; Delay of tree propagation;
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