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This paper deals with coupled electromagnetic-thermal-fluid analysis for temperature prediction of a power transformer. Electric power losses are calculated from finite element method (FEM), and are used as input source of thermal-fluid analysis based on computational fluid dynamics (CFD). In order to accurately investigate the temperature distribution in a power transformer, the thermal problem should be coupled with the electromagnetic problem. The coupling method proposed in this paper is compared with the experimental values for verifying the validity of the analysis. The predicted temperatures show good agreements with the experimental values.