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Background: Transformers for energy frequency converters, especially those with foil windings, have a distinguishing feature: current displacement has a significant effect on additional losses and leakage inductance at higher frequencies (400–800 Hz). The existing engineering methods for calculating parameters of such transformers do not account for the effects of current displacement in foil windings, and the method of calculating foil windings previously proposed by the authors [8] is not adapted to high frequencies. Therefore, it is important to develop models for calculating converter transformers based on magnetic field measurement. Materials and methods: The MS Office package with an integrated library of finite element magnetic field modeling EMLib was used. The system of equations of the transformer dynamics was formed by the method of contour currents and was solved by the Runge-Kutta method. The calculation results were compared with those of the acceptance tests of the prototype transformer made in the laboratory of LLC «Transformer». Results: A field dynamic model has been developed for calculating the parameters of a frequency converter transformer with foil windings, accounting for the influence of the current-displacement effect on leakage inductance and additional losses, thus increasing the accuracy of the verification calculation. A single-phase transformer, powered by a frequency converter in the 400–800 Hz range, has been calculated. The influence of frequency on processes in a foil winding has been investigated. A prototype of the dry transformer OCHCH-296/10 has been manufactured and tested, with parameters meeting the requirements of the customer's technical specification.

Development of models for calculating parameters of converter transformers with foil windings taking into account current displacement