Magnetic and Thermal Simulation Study on Vehicular Traction Transformer with Self-Circulating Evaporative Cooling System

To solve the serious heat dissipation problem caused by the confined installation condition of vehicular traction transformers, the disk winding structure has been introduced to apply the efficient self-circulating evaporative cooling system. In this paper, the magnetic field and the temperature field of the evaporative cooling traction transformer were analyzed for assessing its performances. According to the 3D magnetic model, the winding loss, the core loss and the tank loss of the evaporative cooling traction transformer at the full load condition were exactly calculated by the Field-Circuit Coupling method. Based on the results of loss calculation, the temperature distributions in the disk coils — the typical element of the main heat sources — were analyzed by the thermal model with the uniform heat generation rate assumption. The simulation results confirm the validity of the evaporative cooling scheme.