Tree Initiation Time Evaluation of Epozy/Silica Composites by Partial Discharge Detection
Tree initiation time was evaluated by a pulse detection system developed by the authors to detect a small PD (partial discharge) signal that might take place at first just after a tree was formed. Six kinds of material were prepared for evaluation, i.e. base epoxy resin, microcomposite, two kinds of nanocomposites, and two kinds of nano-micro-mixed-composites. Lengths of trees detected were around 100 μm in our experiments. As a result, it was clarified that tree initiation time is prolonged by nano filler inclusion, but shortened by micro filler filling, and furthermore that nano fillers would help once-shortened time increase for micro filled epoxy specimens. PD erosion was evaluated for the same materials. It was confirmed that a good correlation exists between tree initiation time and PD resistance that is inverse to PD erosion. This correlation indicates that tree formation includes a PD erosion process. Detection of trees smaller than 100 μm is required to clarify how a tree takes place at first.
Tree initiation time Epozy/Silica composites PD detection PD erosion Tree shape
Yu Chen Takahiro Imai Yoshimichi Ohki Toshikatsu Tanaka
Graduate School of Information, Production and Systems, Waseda University, Kitakyushu, Fukuoka, 808- Power and Industrial Systems R&D Center, Toshiba Corporation, Fuchu, Tokyo, 183-8511, Japan Department of Electrical Engineering and Bioscience, Waseda University, Ohkubo, Tokyo, 169-8555, Jap
国际会议
哈尔滨
英文
404-407
2009-07-19（万方平台首次上网日期，不代表论文的发表时间）