Multi-harmonic approach to determine load dependent local flux variations in power transformer cores

Archives of Electrical Engineering

Kay Hameyer¹  Björn Riemer¹ 

关键词: flux distribution;    local flux variations;    multi-harmonic FEM;    nonlinear FEM;    power transformer;   

DOI  :  10.1515/aee-2015-0012

来源: Versita

【 摘 要 】

This paper presents a methodology for the calculation of the flux distribution in power transformer cores considering nonlinear material, with reduced computational effort. The calculation is based on a weak coupled multi-harmonic approach. The methodology can be applied to 2D and 3D Finite Element models. The decrease of the computational effort for the proposed approach is >90% compared to a time-stepping method at comparable accuracy. Furthermore, the approach offers a possibility for parallelisation to reduce the overall simulation time. The speed up of the parallelised simulations is nearly linear. The methodology is applied to a single-phase and a three-phase power transformer. Exemplary, the flux distribution for a capacitive load case is determined and the differences in the flux distribution obtained by a 2D and 3D FE model are pointed out. Deviations are significant, due to the fact, that the 2D FE model underestimates the stray fluxes. It is shown, that a 3D FE model of the transformer is required, if the nonlinearity of the core material has to be taken into account.

【 授权许可】

Unknown