NDLI: Thermal aging study of insulating papers used in power transformers

Content Provider	IEEE Xplore Digital Library
Author	Lessard, M.C. Van Nifterik, L. Masse, M. Penneau, J.F. Grob, R.
Copyright Year	1996
Description	Author affiliation: Inst. de Recherche, Hydro-Quebec, Varennes, Que., Canada (Lessard, M.C.)
Abstract	Paper is a low-cost base material with outstanding mechanical and electrical properties, which is why it is still a key element in the insulation of electrical apparatus. Under the effect of a variety of factors including temperature, paper can substantially lose its properties, thus jeopardizing the service life of costly equipment. To remedy this situation, new so-called thermally upgraded papers are being made by certain manufacturers. A study carried out jointly by Hydro-Quebec, Electricite de France and the Ecole Nationale Superieure de Chimie de Toulouse has allowed researchers to qualify the thermal resistance of three different types of thermostable paper. These papers have been selected as being representative of what is available on the market today. The paper samples were subjected to two types of thermal aging tests in the presence of mineral oil in order to represent normal condition of operation (150/spl deg/C) as well as thermal failure (hot spot, 200/spl deg/C and 250/spl deg/C). The thermal degradation of the paper insulation is characterized by various physicochemical methods including measurement of the degree of polymerization, determination of 2-furfural in mineral oil by HPLC as well as determination of various sugars (monosaccharides, polysaccharides and anhydrosugars) in the paper using ion chromatography. This last method allows us to verify the formation of cellobiose, which is the real repeat unit of cellulose, as well as that of levoglucosan, which is an anhydrosugar and a precursor of 2-furfural. The evolution of all of these parameters, measured as a function of time, has allowed us to compare the thermal resistance of various insulating papers. The results of this study seem to show that, compared to traditional kraft paper, certain paper types are more susceptible to being thermally upgraded than others. This study also allowed us to demonstrate that the use of an inhibitor in mineral oil (DBPC) does not seem to influence the thermal degradation of these papers.
Starting Page	854
Ending Page	859
File Size	462179
Page Count	6
File Format	PDF
ISBN	0780335805
DOI	10.1109/CEIDP.1996.564642
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-10-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aging Power transformer insulation Power transformers Thermal resistance Minerals Petroleum Thermal degradation Mechanical factors Dielectrics and electrical insulation Temperature
Content Type	Text
Resource Type	Article

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