Mechanism of propagation and suppression of electrical tree in polymer nanocomposite

2016 Fiscal Year Final Research Report

• Project/Area Number: 26630337
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Composite materials/Surface and interface engineering
• Research Institution: Osaka Research Institute of Industrial Science and Technology
• Principal Investigator: Iwata Shinya 地方独立行政法人大阪府立産業技術総合研究所, その他部局等, 研究員 (10642382)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 電気トリー / 絶縁破壊 / ナノコンポジット / X線CT

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.

Free Research Field

電気絶縁材料