NDLI: Treeing in heat-treated, mechanically pre-stressed electrical insulation

Content Provider	IEEE Xplore Digital Library
Author	Varlow, B.R. Al-Ghamdi, S.A.
Copyright Year	2001
Description	Author affiliation: Sch. of Eng., Manchester Univ., UK (Varlow, B.R.)
Abstract	Mechanical pre-stressing of electrical insulation is achieved by the casting in of fibers in tension into epoxy resin resulting in regions of compressive stress around the fibers following curing of the resin. This has previously been found to increase the resistance to the development of electrical trees in the composite material thus produced. Room temperature cured resin has a relatively low glass transition temperature and the effect of pre-stressing is lost if the samples are heated to temperatures in excess of 40/spl deg/C. This has been demonstrated by monitoring the remanent stress in the fibers by Raman spectroscopy. Using this technique it has been possible to confirm that the pre-stressing effect can be retained at temperatures up to 80/spl deg/C when the glass transition temperature has been raised by curing the resin at 100/spl deg/C. Annealing 100/spl deg/C cured samples at temperatures between 40 and 100/spl deg/C has shown the permanence of the pre-stressing effect up to 80/spl deg/C. Treeing tests carried out at elevated temperatures on pre-stressed samples cured at 100/spl deg/C have revealed that the effect of pre-stressing on the development of electrical trees, although lost above 40/spl deg/C in 20/spl deg/C cured material, shows a degree of permanence at temperatures up to 80/spl deg/C in material cured at 100/spl deg/C.
Starting Page	232
Ending Page	235
File Size	383987
Page Count	4
File Format	PDF
ISBN	0780370538
DOI	10.1109/CEIDP.2001.963527
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-10-14
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resistance heating Temperature Trees - insulation Curing Glass Dielectrics and electrical insulation Casting Epoxy resins Compressive stress Electric resistance
Content Type	Text
Resource Type	Article

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