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

• Autorzy: Riemer B. , Hameyer K.

Identyfikatory

DOI

10.1515/aee-2015-0012

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

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

• Wydawca: Polish Academy of Sciences, Committee on Electrical Engineering
• Czasopismo: Archives of Electrical Engineering
• Rocznik: 2015
• Tom: Vol. 64, nr 1
• Strony: 129--138
• Opis fizyczny: Bibliogr. 5 poz., rys., wz.

Twórcy

autor

Riemer B.

• RWTH Aachen University Institute of Electrical Machines Schinkelstraße 4, 52056 Aachen, Germany

autor

Hameyer K.

• RWTH Aachen University Institute of Electrical Machines Schinkelstraße 4, 52056 Aachen, Germany

Bibliografia

• [1] Vassent E., Meunier G., Sabonnadier J., Simulation of induction machine operation using complex magnetodynamic finite elements. IEEE Transactions on Magnetics 25(4): 3064-3066 (1989).
• [2] Yamada S., Bessho K., Lu J., Harmonic balance finite element method applied to nonlinear AC magnetic analysis. IEEE Transactions on Magnetics 25(4): 2971-2973 (1989).
• [3] De Gersem H., Vande Sande H., Hameyer K., Strong coupled multi-harmonic finite element simulation package. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 20(2): 535-546 (2001).
• [4] Riemer B., Lange E., Hameyer K., Calculation of the flux distribution of three phase five limb power transformers considering nonlinear material properties. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 32(4): 1230-1243 (2013).
• [5] Riemer B., Bonmann D., Hameyer K., Flux distribution in transformer cores of Phase-Shifting transformers. CIGRE SC A2 & C4 Joint Colloquium 2013, Zurich (2013).