Electromagnetic Parameters Determination of Power Transformers

An integral-differential model of electromagnetic energy conversion in the active part of a power transformer is proposed. It allows taking into account the influence of design parameters, nonlinearities of the electro physical and magnetic properties of active materials on changes in magnetizing currents during the operation of LTC. A new effective technique for calculating the currents of a power transformer based on 3D field simulation data of electromagnetic processes in a power transformer is developed and implemented. It has high accuracy, simplicity of numerical realization. Its application allows reducing the error in calculating the magnetizing currents of the transformer up 15 to 23% in comparison with their estimation according to the rated data of the open-circuited mode or by well-known techniques.