抄録
It is expected that life of oil immersed transformer is about 30 years. In recent years, transformer of 25-30 years lapse is being increased. For that reason, development of life diagnosis technique is carried out actively.
Life of transformer depends on degradation of the insulating paper. Furfural generates by decomposing the insulating paper.
Recently, relationship between amount of furfural and degradation of the insulating paper has investigated by some investigators. We have found that oil immersed insulating paper has property which adsorbs furfural existing in oil. This is important phenomenon for estimation of life because the life is calculated from amount of furfural in oil.
In this study, following basic phenomena investigate for life diagnosis technique.
(1) Influence of degassing on amount of furfural in the insulating oil.
(2) Adsorption phenomena of furfural in the insulating paper.
(3) Relationship between amount of furfural and degree of polymerization of the insulating paper.
(4) Relationship between ratio of furfural and hydroxymethylfurfural and heating temperature.
