Surface analysis of epoxy nanocomposite insulator materials eroded by partial discharge

Tomonori Iizuka, Yuqing Zhou, Tomoaki Maekawa, Toshikatsu Tanaka, Kohei Tatsumi

研究成果: Conference contribution

6 被引用数 (Scopus)

抄録

Effects of the addition of nano filler particles in the improvement of epoxy resin insulating characteristics were investigated and it has been clarified that surface erosion resulting from partial discharge (PD) could be substantially suppressed by the addition of several percent of nano filler content to epoxy composites. One insulating performance improvement mechanism resulting from nano filler addition could be related to the deposition of filler particles on the eroded surface. However, no analysis reports on PD-related surface erosion have been identified to date. In this study, epoxy resin degradation and epoxy composite materials were quantitatively evaluated and eroded surfaces resulting from PD were analyzed by energy dispersive X-ray spectrometry (EDX) and auger electron spectroscopy (AES). To facilitate our experiments, neat epoxy resin specimens consisting of 3 wt% micro-SiO<inf>2</inf> composites and 3 wt% nano-SiO<inf>2</inf> composites, were prepared for use. Accelerated PD tests were performed with an applied voltage of 4 kV<inf>rms</inf> and a frequency of 600 Hz in an air atmosphere. In our experiments, erosion depths of all specimens were increased by lengthening the discharge time, and the addition of fillers to the epoxy resin suppressed the degree of the erosion, compared with the neat epoxy specimens. Out of these, nano filler composites were found to be particularly effective. The results of scanning electron microscopy (SEM) observation and EDX analysis of the eroded surfaces showed that the filler amounts deposited on the surface increased with lengthening discharge time in the composite specimens. After removing the deposited filler particles via ultrasonic cleaning, an increase in the SiO<inf>2</inf> surface concentration could still be detected for the nanocomposite materials via AES measurements. Through an analysis of AES depth profiles, the increased layer thickness of the SiO<inf>2</inf> surface contents was found to be from 10 to 20 nanometers. This indicates that that the surface resin was selectively sputtered during PD. From the above experimental results, it can be concluded that one of the major mechanisms related to improving insulating performance via filler additions was the surface covering provided by filler deposition during the PD. In the case of nano filler composites, the outermost surface was more effectively and densely covered with filler particles during the PD.

本文言語English
ホスト出版物のタイトル2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014
出版社Institute of Electrical and Electronics Engineers Inc.
ページ703-706
ページ数4
ISBN(印刷版)9781479975235
DOI
出版ステータスPublished - 2014 12 22
イベント2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014 - Des Moines, United States
継続期間: 2014 10 192014 10 22

Other

Other2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2014
CountryUnited States
CityDes Moines
Period14/10/1914/10/22

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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