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Thermal Analysis of the Natural Convection Cooling Type Transformer

Oh Yeon-Ho    (Dept. of Electrical Engineering, Wonju National College   ); Song Ki-Dong    (Dept. of Electrical Engineering, Wonju National College   ); Sun Jong-Ho    (Dept. of Electrical Engineering, Wonju National College  );
  • 초록

    The life expectancy of a transformer largely depends on the temperature-rise it experiences. If the temperature-rise exceeds limits specified in the design standards, the aging of insulating materials is accelerated and the capability of the cooling medium is deteriorated. Consequently, applicable limits for the temperature-rise are essential in designing the transformer and the coolers, demanding the estimation of the transformer's thermal behavior. In order to analyze the temperature characteristics of the transformer, numerical analysis by way of the commercial CFD code has been carried out, and temperature-rise testing to verify computed results was performed. The results obtained in this study show that there is a good agreement between computed outcomes and experimental outcomes.


  • 주제어

    natural convection .   back-to-back method .   thermocouple .   heat source .   heat transfer coefficient.  

  • 참고문헌 (6)

    1. ?Klaus A. Hoffmann, Steve T. Chiang, 'Computationa Fluid Dynamics for Engineers', A Publication of the Engineering Education System, 1993 
    2. ?P.H.G. Allen 'Transformer Winding Thermal Design by Computer', lEE Conference Pub. No. 51, pp. 589, 1969 
    3. ?P.Venkateswarlu, A.R. Prasad, 'Numerical Prediction of the Temperature Distribution in the Coils of a Transformer Winding', CIGRE 12-04, 1984 Session 
    4. ?K.Goto, H.Tsukioka, E.Mori, 'Measurement of Winding Temperature of Power Transformers and Diagnosis of Ageing Deterioration by Detection of CO2 and CO', CIGRE 12-102, 1990 Session 
    5. ?A.White, M.R.Daniels, 'Thermal Assessment of Transformers', Cigre 1990 session, 12-105 
    6. ?K.Karsai D et al., Large Power Transformers, Oxford N.Y.,1987 

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