| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
An electrical tree is a pre-breakdown phenomenon of insulating materials. To elucidate the suppression mechanism of an electrical tree by inorganic nano-fillers, the treeing test was conducted using a needle electrode for the epoxy resin and epoxy resin/nano-silica particle composite. Three-dimensional structural analysis of the electrical tree was performed on these samples by a micro-X-ray computed tomography (CT) using synchrotron radiation. As a result, a branch-type electrical tree and a bush-type electrical tree were found in the neat epoxy resin and the epoxy resin/nano-silica composite, respectively. The characteristics of structure of the branch-type and bush-type electrical tree were evaluated by the fractal dimension from the reconstructed CT images and dielectric breakdown model. Furthermore, it was revealed that the reduction in dielectric breakdown voltage due to humidity treatment is reduced in the epoxy resin/nano-silica composite.
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