Magnetic flux distributions in transformer core joints

Mechler, G.E.; Girgis, R.S.

doi:10.1109/61.847251

Cited by 57 publications

(28 citation statements)

References 6 publications

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“…During core assembly, additional short circuits might be introduced on the short edges of the sheets forming the magnetic joints. However, these do not cause additional loss since in Multi-Step-Lap cores there is nearly zero flux passing the air gaps [7].…”

Section: Estimation Of Burr-induced Lossmentioning

confidence: 99%

Capacitive short circuit detection in transformer core laminations

Schulz

Duchesne

Roger

et al. 2008

Journal of Magnetism and Magnetic Materials

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Section: Estimation Of Burr-induced Lossmentioning

confidence: 99%

Capacitive short circuit detection in transformer core laminations

Schulz

Duchesne

Roger

et al. 2008

Journal of Magnetism and Magnetic Materials

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“…Moreover, the majority of simulations with finite element methods are focusing on the behaviour at normal operating flux densities. [2][3][4][5][6] Recent concerns on overflux challenges brought by geomagnetically induced currents or quadrature booster operations are now encouraging more flux distribution analysis at high flux densities. 7,8 This paper considers a realistic scenario of magnetic flux transfer, combining the effects of stacking air gaps, joint air gaps, and the anisotropic characteristics of laminations.…”

Section: Introductionmentioning

confidence: 99%

Magnetic flux distribution in power transformer core with mitred joints

Tang

Guo

Wang

2015

Journal of Applied Physics

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Core loss behavior in high frequency high power transformers-I: Effect of core topology J. Renewable Sustainable Energy 4, 033112 (2012); 10.1063/1.4727910 Effects of magnetomechanical vibrations and bending stresses on three-phase three-leg transformers with amorphous coresThe magnetic flux distribution in the transformer core, and particularly at the joints, has a considerable influence on the efficiency of the core. This paper considers a more realistic scenario of magnetic flux transfer, combining the effects of air gaps and the anisotropic characteristics of transformer core laminations. Based on the anisotropic magnetization characteristics of modern graded grain-oriented electrical steels, the magnetic flux distribution in the core joint region as a function of the operating flux density and the joint configuration is investigated using the finite element method up to high flux densities. 2D results illustrate the benefits of using multi-step lapped joints versus single-step lapped (SSL) joints at various flux densities. Thin low-permeability gaps are introduced in the 3D model with SSL 45 mitred overlapped joint configuration, which successfully addresses computation challenges of the large number of mesh elements for the air. V C 2015 AIP Publishing LLC. [http://dx.

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“…This deviation of the magnetic field lines with respect to the rolling direction creates localized regions of higher magnetic flux density and therefore increased losses. In [4][5][6][7][8][9] it was proved that core losses in joint regions are closely dependent on the magnetic field in the laminations, physical properties of the core material and construction parameters of the joint region such as the number of steps, the number of lamination per step, size of gaps and lamination thickness.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Power Loss and Magnetic Flux Distribution in Octagonal Wound Transformer Core Configurations

Çınar¹,

Alboyacı²,

Şengül³

2014

Journal of Electrical Engineering and Technology

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-In this paper, various configurations of octagonal wound transformer core topology, which has previously proved advantages on conventional wound cores, are studied. Each configuration has different joint types and different placement of joint zones on the core. Magnetic flux distributions and power losses of each configuration are analyzed and compared. Comparisons are based on both 2D&3D finite element simulations and experimental studies. The results show that, joint types and their placements on the core cause local flux accumulations and dramatically affect power loss of the core.

show abstract

Magnetic flux distributions in transformer core joints

Cited by 57 publications

References 6 publications

Capacitive short circuit detection in transformer core laminations

Capacitive short circuit detection in transformer core laminations

Magnetic flux distribution in power transformer core with mitred joints

Comparison of Power Loss and Magnetic Flux Distribution in Octagonal Wound Transformer Core Configurations

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