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A Novel Method for Thermal Analysis of MF Transformers with Hollow Windings

One of the key problems in the research and development of high-power electronic transformer is the thermal analysis of high-frequency or medium frequency transformer under non-sinusoidal load. At present, there is a lack of a convenient and effective method. Taking the thermal problem of an medium frequency transformer with a hollow conductor structure as an example, this paper presents an analysis method suitable for researchers. Firstly, based on the finite element model, the loss of hollow winding is studied by numerical analysis. Then, based on the similarity principle, the equivalent reduction method for calculating the core loss of medium frequency transformer is presented. Finally, the measurement data of the magnetic properties of the transformer core and the measurement data of the transformer loss under the medium frequency excitation are given. The complete research work can provide a method for the thermal analysis of high frequency or medium frequency transformer.