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Characterization of a severely degraded silicone elastomer HV insulator-an aid to development of lifetime assessment techniques

Liu, Heping, Cash, Gregory A., Birtwhistle, David, & George, Graeme A. (2005) Characterization of a severely degraded silicone elastomer HV insulator-an aid to development of lifetime assessment techniques. IEEE Transactions on Dielectrics and Electrical Insulation, 12(3), pp. 478-486.

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Abstract

A high voltage composite insulator showed severe degradation and failure of the silicone elastomer sheds following service in a substation environment. Sensitive analytical techniques were used to investigate the extent of degradation of the silicone elastomer (SiE). The polymer content of some surface regions decreased as degradation increased. This was quantified through observation by scanning electron microscopy (SEM), weight loss upon heating using thermogravimetric analysis (TGA), determination of surface "silica" levels in damaged areas by X-ray photoelectron spectroscopy (XPS) and Raman mapping through a cross-section of the elastomer producing a degradation depth profile. It is believed that due to the environmental conditions at the site of installation, the electric field may have reached corona onset threshold on parts of the elastomer surface. Because of the moist conditions the corona was maintained, effectively preventing the elastomer from regaining hydrophobicity and leading in time to severe degradation. This investigation has also identified techniques applicable to the assessment of condition of other, less damaged SiE insulators which may in turn lead to the prediction of the remaining useful lifetime.

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27 citations in Scopus
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16 citations in Web of Science®

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ID Code: 10693
Item Type: Journal Article
Keywords: Raman spectroscopy, X, ray photoelectron spectra, corona environmental degradation, high, voltage techniques, insulation testing, life testing, scanning electron microscopy, sensitivity analysis, silicone rubber insulators, thermal analysis
DOI: 10.1109/TDEI.2005.1453452
ISSN: 1070-9878
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2005 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 13 Nov 2007
Last Modified: 29 Feb 2012 23:17

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