期刊
ENERGIES
卷 11, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/en11030517
关键词
power transformers; dielectric dissipation factor; oil impregnated paper insulation; moisture; drying process; drying curves; diffusion coefficient; heating process
资金
- ViAHT
- CENGIVRE International Research Center at Universite du Quebec a Chicoutimi (UQAC)
It is now well-established that moisture in the oil paper insulation used in power and instrument transformers significantly reduces the transformers' lifetimes, and can eventually lead to premature failure. This moisture should, therefore, always be removed, not only during production but also after repairs. At the final stage of manufacturing, the drying process should be carried out to remove water and air vacuoles contained in the cellulose-based paper before impregnation. Successful drying helps increase the residual life of transformers, because the presence of moisture and air vacuoles accelerates the aging/degradation process of the oil paper insulation. Proper estimation of residual moisture before impregnation and the determination of the time required for drying play key roles in the time-consuming process of drying. In this paper, the disadvantages of inadequate drying are addressed, followed by a mathematical approach to model the paper drying process. A mathematical model describing the kinetics of drying according to temperature, initial moisture, paper weight, final moisture, and extraction rate is proposed. This model also estimated the amount of moisture removed at the end of the drying process.
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