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Information × Registration Number 0214U002322, 0111U001134 , R & D reports Title The theory of nonsteady electromagnetic processes at the high-voltage network transformers popup.stage_title Head Zirka Sergey Evgenievich, Registration Date 29-01-2014 Organization Dniepropetrovsk national university popup.description2 The object of research is nonstationary electromagnetic processes in the magnetic system of a three-phase transformer, as well as in the magnetic systems of the bank of single-phase transformers, and their impact on transients in high-voltage power network. The purpose of the paper is a scientific substantiation of the necessity and the development of a new method of studying nonstationary processes in the magnetic systems made of isotropic and anisotropic ferromagnetic materials, and the creation on this basis a unified methodological approach to the analysis of the processes in transformers, which operate within the power network. The method of the research is numerical modeling electromagnetic processes in topological transformer models with the use of static and dynamic hysteresis models. A new, conceptually simple, history-dependent hysteresis model has been developed, which allows one to reproduce hysteresis loops of arbitrary shape. A method of taking into account magnetic hysteresis, classical eddy-current and magnetic viscosity has been created and implemented in transformer magnetic systems using the thin sheet method. A concept of a topological reversible transformer model which is applicable at high saturation of the core has been proposed. A method of the parameter identification of magnetic system of transformers of different designs, which takes into account magnetic fluxes beyond the core, is developed. A method of taking into account the tank and core gaps influence has been developed. The approach implemented in the models creates a scientific basis for applied studies in the area of the design and optimization of electrical machines and transformers of different purposes. Results of the work can be employed in scientific and industrial organizations, which are engaged in design and manufacturing electrotechnical equipment (transformers, electrical machines etc.) Product Description popup.authors Мороз Юрій Іванович popup.nrat_date 2020-04-02 Close