FINITE ELEMENT METHOD FOR NONLINEAR EDDY CURRENT PROBLEMS IN POWER TRANSFORMERS
نویسندگان
چکیده
An efficient finite element method to take account of the nonlinearity magnetic materials when analyzing three dimensional eddy current problems is presented in this paper. The problem formulated terms vector and scalar potentials approximated by edge node based basis functions. application Galerkin techniques leads a large, nonlinear system ordinary differential equations time domain. excitations are assumed be time-periodic steady state periodic solution interest only. This represented frequency domain as Fourier series for each degree freedom number harmonics determined, i.e. harmonic balance applied. Due nonlinearity, all coupled other, so size equation times degrees freedom. would decoupled if were linear, therefore, special iteration technique, fixed-point used linearize selecting timeindependent permeability distribution, called step. uncoupled within these steps resulting two advantages. One that obtained solving algebraic with only many unknowns there A second benefit systems independent other can solved parallel. appropriate selection fixed point accelerates convergence iteration. applied analysis large power transformer. electromagnetic field allows computation various losses like massive conducting parts (tank, clamping plates, tie bars, etc.) well specific laminated (core, tank shielding, etc.). effect presence higher on investigated.
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ژورنال
عنوان ژورنال: Energija
سال: 2022
ISSN: ['0354-8651', '2812-7528']
DOI: https://doi.org/10.37798/2012611-4240