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
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;
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
DOI :
10.1109/ICDL.1993.593985
