Diffusion coefficient in transformer pressboard insulation part 1: non impregnated pressboard

Water is harmful for transformers; the dynamic behavior of moisture influences the dielectric integrity and insulation aging in a transformer on operation. In this paper, the determination of the diffusion coefficient of moisture in transformer pressboard is tackled. This work has been focused in an...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2014-02, Vol.21 (1), p.360-368
Main Authors: Villarroel, R., Garcia, D.F., Garcia, B., Burgos, J.C.
Format: Article
Language:English
Subjects:
diffusioncoefficient
Equations
Mathematical model
Moisture
moisture dynamics
Oil insulation
Power transformer insulation
pressboard
Transformer solid insulation
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Summary:Water is harmful for transformers; the dynamic behavior of moisture influences the dielectric integrity and insulation aging in a transformer on operation. In this paper, the determination of the diffusion coefficient of moisture in transformer pressboard is tackled. This work has been focused in analyzing non oil-impregnated pressboard, so the obtained coefficient is useful for studying the processes of transformer drying in factory. Drying experiments were developed in a thermogravimetric analyzer on nonimpregnated samples of pressboard subjected to different drying temperatures. The experimental conditions were simulated by means of a diffusion model implemented by means of Finite Element Method. The comparison between estimated and measured values allows drawing conclusions about the accuracy of the proposed coefficient.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2013.004051