NDLI: Direct determination of moisture in solid oil-paper insulation

Content Provider	IEEE Xplore Digital Library
Author	Gupta, B.K.
Copyright Year	1998
Description	Author affiliation: Ontario Hydro, Toronto, Ont., Canada (Gupta, B.K.)
Abstract	The life of oil-paper insulation depends critically on the moisture content in paper. At present no method is available for direct measurement of moisture in paper insulation in transformers. This paper summarizes the results from a project for development of a method for direct measurement of moisture in paper in oil-paper insulated electrical equipment. Several techniques were investigated for their suitability for this application. The infrared absorption was found to be the most promising technique. The effectiveness of the infrared technique was examined on model transformer coils and on a power transformer, using optical fibre bundles for directing infrared radiation. The ratio of intensity of radiation back scattered from paper at a reference wavelength to that at a water absorption wavelength (Br/Bw) was used as a measure of the moisture content. From dry to ambient paper condition, the parameter Br/Bw changed by over 60%, and these readings were reproducible to better than 1%. Thus the infrared technique is sensitive enough to detect changes of the order of 0.1% in moisture content (eg, 1.9% to 2.0%) of paper insulation.
Starting Page	583
Ending Page	586
File Size	464957
Page Count	4
File Format	PDF
ISBN	078034927X
ISSN	1089084X
DOI	10.1109/ELINSL.1998.694860
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-06-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Solids Oil insulation Power transformer insulation Moisture measurement Electromagnetic wave absorption Infrared detectors Electric variables measurement Dielectrics and electrical insulation Coils Power transformers
Content Type	Text
Resource Type	Article

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