Naslov
3D finite element analysis of traction transformer for EMU-250

Autori
Žarko, Damir ; Kovačić, Marinko ; Hanić, Zlatko

Izvornik
Fakultet elektrotehnike i računarstva, Zavod za elektrostrojarstvo i automatizaciju

Vrsta, podvrsta
Ostale vrste radova, elaborat/studija

Godina
2016

Ključne riječi
traction transformer ; 3D finite element analysis ; No-load losses ; Load losses ; Inrush current ; Impedance Matrix

Sažetak
This study involves 3D finite element (FE) modelling of a traction transformer for the purpose of analyzing its performance in the design stage. The principal tasks of the study are: calculation of no-load current and losses in the transformer core for sinusoidal excitation at rated fundamental primary voltage and frequency, calculation of load losses at fundamental frequency (I2R losses in transformer windings, eddy current and proximity losses in transformer windings, supplementary losses in the magnetic shields and the tank), calculation of harmonic losses (I2R losses in transformer windings, eddy current and proximity losses in transformer windings, supplementary losses in the core clamps and the tank), calculation of total losses at 25 kV, 85 deg C (fundamental and harmonic I2R losses in transformer windings, eddy current and proximity losses in transformer windings, supplementary losses in the magnetic shields and the tank, calculation of impedance matrix for predefined combinations of powered and short- circuited windings, calculation of inrush current with switch on at the time instant resulting with maximum DC component of current and electromagnetic effect analysis All 3D finite element simulations have been performed using commercially available software Infolytica MagNet. In order to obtain the most realistic model and to provide maximum feasible accuracy of the obtained results, all significant geometric features of the studied transformer and the properties of materials have been taken into account within the limits of the available software and PC hardware. Those include: detailed representation of all parts of the transformer geometry in 3D space that have significant influence on magnetic field solution inside the transformer and in the surrounding space confined within the limits of its tank, modelling of laminated core using nonlinear materials with anisotropic permeability, modelling of laminated magnetic screens using nonlinear materials with anisotropic permeability, coupling of electromagnetic model with electrical circuits, inclusion of eddy current and proximity effects in individual strands of the transformer windings and tuning of the finite element mesh density in the critical regions considering the presence of induced eddy currents and skin depth of the magnetic material.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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