Abstract

MARTINS, Maria Augusta G.. Furfuraldeído: Um indicador prático da degradação térmica do papel Kraft de transformadores. C.Tecn. Mat. [online]. 2007, vol.19, n.1-2, pp.25-33. ISSN 0870-8312.

The transformer life expectancy, in terms of aging, is related to the condition of the solid insulation, as this is the major component of a transformer, that once degraded cannot be replaced without dismantling the entire transformer. This is the reason why it is very important to know the degradation of insulating paper, which can be measured by its average viscosimetric degree of polymerization (DP). To analyse paper, we need to take paper samples, from the transformer, but this is not possible without dismantling it. As thermal degradation of paper do generate furanic compounds and the concentration of these products, namely the furfuraldehyde (2FAL) in oil, can be easily measured by HPLC (High Performance Liquid Chromatography), this is the best alternative method, used nowadays to determine the aging of Kraft paper. The mechanisms of cellulose degradation to produce 2FAL, the kinetics of this degradation and also the phenomena which affect the quantity of 2FAL dissolved in oil, and the factors that influence these phenomena, are the main issues addressed here.

Keywords : Furfuraldehyde; 2FAL; DP; Viscosimetric polymerization degree; Degradation; Pyrolysis; Hydrolysis; Cellulosic paper; Transformer.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )