NDLI: Enhanced Performance of Tree Initiation V-t Characteristics of Epoxy/Clay Nanocomposite in Comparison with Neat Epoxy Resin

Content Provider	IEEE Xplore Digital Library
Author	Raetzke, S. Ohki, Y. Imai, T. Kindersberger, J. Tanaka, T.
Copyright Year	2008
Description	Author affiliation: Lab. for High Voltage Technol. & Power Transm., Tech. Univ. Munchen, Munich (Kindersberger, J.) \|\| Power & Ind. Syst. R&D Center, Toshiba Corp., Fuchu (Imai, T.) \|\| IPS Grad. Sch., Waseda Univ., Kitakyushu (Raetzke, S.; Tanaka, T.) \|\| Dept. of Electr. Eng. & Biosci., Waseda Univ., Tokyo (Ohki, Y.)
Abstract	Tree initiation behavior of an epoxy nanocomposite with 5 wt % nanoclay (layered silicate) was investigated in comparison to neat epoxy resin without fillers. To shorten the time for experiments, 600 Hz was used instead of 60 Hz, as acceleration for tree initiation had been confirmed at 10 $kV_{rms}$ and 14 $kV_{rms}$ between the two frequencies. V-t characteristics for tree initiation rather than tree growth to bridge the electrodes were obtained for conventional type of treeing specimens with an embedded steel needle subjected to voltages from 2 $kV_{rms}$ to 14 $kV_{rms}.$ As a result, the n value in $V^{-n}$ t characteristics was confirmed to be 5.5 for neat epoxy and larger than 7 for nanocomposite. It was clarified that tree initiation V-t characteristics were improved by approximately one order of magnitude for the epoxy/nanoclay composite compared to the neat epoxy resin. To be precise, such an enhancement factor is one order at high field but even two orders at low field. Formed trees are field dependent. They are rather thick and short in shape at low field, but thin and long at high field. It is concluded from the analysis on the basis of interfacial models and other studies that initial trees are formed due to a PD erosion process at low field during a long time, but due to dielectric breakdown including charge trapping at high field for a short time.
Starting Page	528
Ending Page	531
File Size	2528074
Page Count	4
File Format	PDF
ISBN	9781424425488
DOI	10.1109/CEIDP.2008.4772803
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-26
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Epoxy resins Acceleration Frequency Bridge circuits Electrodes Steel Needles Voltage Shape Dielectric breakdown
Content Type	Text
Resource Type	Article

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