Journal
IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY
Volume 147, Issue 3, Pages 110-114Publisher
IEE-INST ELEC ENG
DOI: 10.1049/ip-smt:20000259
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The analysis of furan degradation products in transformer oil provides a complementary technique to dissolved gas analysis for monitoring transformer condition. The main products of the ageing are 2-furfuryl alcohol, 2-furaldehyde (furfural), 2-acetylfuran and 5-methylfurfural and are formed from wood-based paper (containing lignin and hemicelluloses), cotton-based paper and pure cotton linters in accelerated, laboratory experiments. Also. 5-hydroxy-methyl-cellulose was seen in the early stages of some experiments. The concentration of 2-furaldehyde (furfural) was round to be highest of all the products and the concentrations of all products increased exponentially with time to a maximum value and then decreased. The concentration of most products increased rapidly as the paper approached the end of its useful life, indicating that furfural analysis could provide a sensitive trouble-shooting tool for rapid ageing. All the furan products apart from 2-furfuryl alcohol are relatively stable in the oil, at temperatures up to 140 degrees C.
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