Winding position in power transformers to reduce copper losses: non-sinusoidal currents

The orientation used to wind a transformer is important in power transformers carrying high-frequency currents. Analysis of copper losses due to skin and proximity effects is performed in order to choose the best configuration of the turns inside the winding area when conductors are carrying non-sinusoidal current. Initially results are a direct application of Dowell's formula for the fundamental component and the harmonics of the current flowing through the winding. Later, FEA simulations confirm the relationship between current frequency, insulation thickness, winding window width and winding position.