Thermal analysis of a dry-type distribution power transformer using FEA

This paper presents an analysis of the thermal behavior (convection, conduction and radiation) in steady state of a dry-type distribution power transformer. Dry-type transformers are mainly used in applications where the risk of fire and environmental policy does not allow the use of oil-filled transformers. The model takes into account the fluid (air) and solves the heat transfer equation for non-isothermal stationary laminar flow; together with the radiation between the components in the transformer and with the external ambient temperature. The finite element method is used to solve an axisymmetric model of the transformer. It is also modeled the effect of forced air in the thermal model. It is concluded that the finite element model can predict the thermal process in the stationary state, and that this tool can be used by manufacturers to design better electromagnetic devices.