Abstract Micro- and nano-alumina/epoxy resin composites were prepared in laboratory. The effects of different particle diameters and contents on space charge of epoxy resin composites were analyzed in this paper. The space charge distribution of experimental samples was measured before and after AC aging in high hygrothermal environment, to reveal the effects of alumina on electrical characteristics of composites. It is found that more space charges appeared in micro-composites and nano-composites with the increasing of alumina particles content. The sedimentation phenomenon of micro-alumina particles is more obvious in the samples of micro-alumina/epoxy resin composites than that in the samples of room temperature curable epoxy resin. The samples of micro-alumina/epoxy resin composites show different contents of micro-alumina between the up and down layers. Under the environment of 80℃ and 90% RH, the space charges were detected again after AC aging at 20kV/mm. It is shown that the withstanding aging ability of nano-composite is stronger than those of neat epoxy and micro-composite.
Gong Jin,Li Zhe,Liu Xinyue. Space Charge and AC Field Aging in High Hygrothermal Environment of Alumina/Epoxy Resin Composites[J]. Transactions of China Electrotechnical Society, 2016, 31(18): 191-198.
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2016, Vol. 31 
