NDLI: Surface flashover characteristics of TiO/epoxy nanocomposites in SF

Content Provider	IEEE Xplore Digital Library
Author	Tengfei Li Shengtao Li Shihu Yu Yuanwei Zhu
Copyright Year	2015
Description	Author affiliation: State Key Lab. of Electr. Insulation & Power Equip., Xi'an Jiaotong Univ., Xi'an, China (Tengfei Li; Shengtao Li; Shihu Yu; Yuanwei Zhu)
Abstract	Surface flashover is one of the main factors leading to insulation failure. For example, epoxy insulator in Gas Insulated Switchgear (GIS) is the most vulnerable insulation components; the failure endangers the reliability of GIS and even leads to accidents and economic losses. Thus, developing advanced materials to be much more safely used in GIS is significant. Here we report the study on surface flashover characteristics of a nanocomposite, $nano-TiO_{2}/epoxy.$ The samples were prepared using molded method after uniformly dispersing nano-scale $TiO_{2}$ particles in epoxy resin with different loadings (0.1%, 0.5%, 1%, 3%, and 5%). The flashover characteristic was studied under 1.2μs/50μs standard lightning impulse voltage and DC voltage. The flashover voltage of $TiO_{2}/epoxy$ nanocomposites was increased compared with neat epoxy resin. However, the flashover voltage decreased slightly when the filler loading exceeded 1%. At the same time, surface charge accumulation and decay behaviors and volume resistivity were also investigated. Experimental results show the trap density and trap energy in samples related with the flashover characteristics in $SF_{6}.$ It seems that surface flashover voltage is mainly affected by deep trap density of the samples. Low trap density may lead to better flashover performance. The volume resistivity results showed that the resistivity of $Nano-TiO_{2}/epoxy$ decreased at lower filler content which was contributed to the increase of the flashover characteristics in $SF_{6}.$
Starting Page	52
Ending Page	55
File Size	919679
Page Count	4
File Format	PDF
ISSN	21609241
e-ISBN	9781479989034
DOI	10.1109/ICPADM.2015.7295206
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-19
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Flashover Loading Surface treatment Nanoparticles Conductivity Electric potential Nanocomposites volume resistivity surface flashover TiO2/epoxy nanocomposite trap parameters
Content Type	Text
Resource Type	Article

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