Naslov
Eddy current losses in open-type cores

Autori
Frljić, Stjepan ; Trkulja, Bojan ; Drandić Ana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, prošireni sažetak, znanstveni

Skup
20th International IGTE Symposium 2022 on Computational Methods in Electromagnetics and Multiphysics

Mjesto i datum
Graz, Austria, 18-21.09.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
eddy currents, FEM, transformers

Sažetak
• Purpose: The aim of this paper is to present a methodology for calculating eddy current losses in the core of a single-phase power voltage transformer, which, unlike a standard power transformer, has an open-type core (I-type core). In those apparatus, reduction of core losses is achieved by using a multi-part open-type core that is created by merging a larger number of leaner cores. • Design/methodology/approach: 3D FEM approach for calculation of eddy current losses in open-type cores based on a weak AτA formulation is presented. Method in which redundant degrees of freedom are eliminated is shown. This enables faster convergence of the simulation. The results are benchmarked using simulations with standard AVA formulation. • Findings: Results using weak AτA formulation with elimination of redundant degrees of freedom are in agreement with both simulation using only weak AτA formulation and with simulation based on AVA formulation. • Research limitations/implications: The presented methodology is valid in linear cases, while the nonlinear case will be part of future work. • Practical implications: Presented procedure is stable and can be used for the optimization when designing the open-type core of apparatus like power voltage transformers. • Originality/value: The value of the presented methodology is defined by the particularity of the geometry of the open- type core which favors the use of a weak A𝜏A- formulation. The use of a weak formulation based on the magnetic vector potential A and the current vector potential 𝜏, faster convergence of the simulation is achieved. The method can be easily implemented and yields satisfactory results.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA