| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Outline of Final Research Achievements |
Metal hydroxides, such as magnesium hydroxide and hydrated alumina, and calcium carbonate have the property of endothermic reaction at a high temperature. It was confirmed that these fillers have a restraint effect on the growth of an electrical tree and that the lifetime of the polymer insulator can be improved. The electric breakdown life of epoxy resin with 30 phr of one of these fillers was 100 times longer than the epoxy resin without it. Oxide such as magnesium oxide and calcium oxide was detected by the electron beam diffraction analysis of the fillers located near electrical tree, and it showed that the endothermic reaction was took place. In other words, as an explanation of the restraint effect of an electric tree, the effect of the energy dispersion of partial discharge was suggested.
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