DocumentCode
2007599
Title
Thermal aging of oil insulation comparing conventional and thermally upgraded papers
Author
d´Almeida e Silva, Vera Lucia
Author_Institution
CEPEL, Rio de Janeiro, Brazil
fYear
1993
fDate
19-23 Jul 1993
Firstpage
456
Lastpage
460
Abstract
The author reports on experiments on two conventional and four thermally upgraded kraft papers and on naphtenic mineral insulating oil. These materials were aged in specially designed glass cells at 125, 140, 155 and 170°C, between 100 and 4000 hr, in a nitrogen atmosphere. Degradation was evaluated according to the tests on papers and oil. Thermally upgraded papers with lower nitrogen content showed the best initial mechanical properties, but they displayed lower mechanical and chemical stability during aging. It is shown that the lower the TI (temperature index), the greater the FAL (furfuraldehyde) evolution
Keywords
paper; 100 to 4000 hr; 125 degC; 140 degC; 155 degC; 170 degC; N2 atmosphere; chemical stability; degradation; furfuraldehyde; kraft papers; mechanical properties; naphtenic mineral insulating oil; oil insulation; thermal ageing; thermally upgraded papers; Aging; Atmosphere; Glass; Mechanical factors; Minerals; Nitrogen; Oil insulation; Petroleum; Testing; Thermal degradation;
fLanguage
English
Publisher
ieee
Conference_Titel
Conduction and Breakdown in Dielectric Liquids,1993., ICDL '93., IEEE 11th International Conference on
Conference_Location
Baden-Dattwil
Print_ISBN
0-7803-0791-7
Type
conf
DOI
10.1109/ICDL.1993.593985
Filename
593985
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