Comparison between Thermal-Circuit Model and Finite Element Model for Dry-Type Transformer

Excessive internal temperature of dry-type transformer with foil windings will accelerate insulation aging and greatly reduce the life-span of transformer. In this paper, a dry-type transformer with low voltage foil windings and high voltage wire windings have been modelled as a simplified equivalent thermal-circuit model, which can improve the computation efficiency. On the basis of this model, the distribution of the internal steady state temperature field obtained by using the finite element simulation is in agreement with the calculation results of the equivalent thermal-circuit model.