DocumentCode :
3851783
Title :
Study of oxidation and hydrolysis of oil impregnated paper insulation for transformers using a microcalorimeter
Author :
Knut Brede Liland;Murside Kes;Marit-Helen Glomm Ese;Lars E. Lundgaard;Bjorn E. Christensen
Author_Institution :
NOBIPOL, Department of Biotechnology Norwegian University of Science and Technology Sem S?landsvei 6/8 N-7491 Trondheim, Norway
Volume :
18
Issue :
6
fYear :
2011
fDate :
12/1/2011 12:00:00 AM
Firstpage :
2059
Lastpage :
2068
Abstract :
An isothermal microcalorimeter has been used to study ageing of oil impregnated kraft paper. Under the assumption that the heat flow is proportional to the ageing rate of paper it is found that activation energy seems to be lower for oxidation than for hydrolysis. This observation corresponds well with results obtained by traditional ageing methods. The results have also been confirmed by measuring the changes in DP of the samples used in the calorimetric measurements. Comparing degradation of aged and unaged oil impregnated paper in air gave a higher heat flow for the unaged paper, but the activation energy for the processes remained the same. The process was also studied with another cellulosic material and in addition varying size of the sample holder of the calorimeter, giving similar results. Hence, since the microcalorimeter appears to give the same qualitative ageing characteristics for oxidation and hydrolysis as more time consuming methods, calorimeter could be a useful tool for quick ageing investigations.
Keywords :
"Heating","Oxidation","Aging","Temperature measurement","Materials","Oil insulation","Power transformer insulation"
Journal_Title :
IEEE Transactions on Dielectrics and Electrical Insulation
Publisher :
ieee
ISSN :
1070-9878
Type :
jour
DOI :
10.1109/TDEI.2011.6118644
Filename :
6118644
Link To Document :
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