Abstract
This paper provides examples of application of advanced numerical modelling to analysis of transformer operation and design optimization. Computer simulations are useful tools that help engineers in keeping the balance between the continuous pursuit of reducing the cost of transformers and assuring high quality performance. The presented examples refer to different types of transformers and different problems in their operation. They include analysis of thermal shock test of the dry transformer, analytical, experimental and numerical modeling for improvement of passive cooling in oil-immersed distribution transformers and seismic analyses of power transformers. In each case the numerical modelling approach is presented and the example results are shown. Simulations of thermal shock test indicate large temperature gradients that may have essential influence on mechanical behavior of the dry transformer coil. Further, the higher cooling efficiency of the new concept of passive cooling is validated using mathematical, numerical and experimental models. Finally, the proposed numerical methods of seismic analysis indicates that oil has an influence on structure dynamics and the whole transformer system must be taken into account during vibration analysis.
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