Grain-Oriented Steel Rings for an Experimental Comparison of Relative Magnetostriction and Maxwell's Forces Effects

Penin, Rémi; Lecointe, Jean‐Philippe; Parent, Guillaume; Brudny, J.F.; Belgrand, Thierry

doi:10.1109/tie.2013.2276772

Cited by 12 publications

(3 citation statements)

References 24 publications

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“…It appears that for B RD , the fundamental (100 Hz) and the first harmonic (200 Hz), which are the most significant spectral lines in this case, are the highest in the case of HGOES. This is in good accordance with the fact that B C HGO > B C CGO as previously stated, in one hand, and the fact that CGO sheets are noisier than HGO ones [29][30][31][32], on the other.…”

Section: Influence Of the Electrical Steel Gradesupporting

confidence: 89%

A new approach to the critical induction in transformer cores

Parent

Penin

Lecointe

et al. 2016

JAE

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The most critical areas in power transformers are their corner joints where the magnetic flux distribution presents a very high heterogeneity. This heterogeneity results from several parameters such as the geometry of the magnetic core, the anisotropy level of the electrical steel laminations and a critical induction. This paper is focused on the magnetic steel grades influence on the critical induction, adding a new parameter to those classically considered, such as the number of steps in a multiple step lap stack. Due to the difficulty to perform local measurements inside a real transformer corner, the study is performed both experimentally and by Finite Element analyses on a simplified magnetic core structure. The paper highlights that, in a corner of a core, it exists a critical induction level which depends on the magnetic steel grades and that, in a lamination, the magnetic flux density value along the Transverse Direction can be of the same order that it has along the Rolling Direction.

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Section: Influence Of the Electrical Steel Gradesupporting

confidence: 89%

A new approach to the critical induction in transformer cores

Parent

Penin

Lecointe

et al. 2016

JAE

Self Cite

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“…The latter is caused by core vibrations which are more complex resulting from many phenomena. Up to now, several factors have been claimed to have relevance to the flux distribution and core vibrations, such as bolt holes [11], core clamping [12] and core structures [2]. Many works have been done at several levels:…”

Section: Sheet 'I'mentioning

confidence: 99%

“…The magnetic and magnetostrictive behaviors of polycrystal are defined as the average values of local quantities (12) (13)…”

Section: A Multi-scale Modelmentioning

confidence: 99%

Homogenized Magnetoelastic Behavior Model for the Computation of Strain Due to Magnetostriction in Transformers

et al. 2016

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This paper deals with the prediction of the deformation of a multi-layer transformer core made of an assembly of anisotropic 'E-shaped' and 'I-shaped' sheets. This magneto-mechanical coupled problem is solved by a stepping finite element method sequential approach: magnetic resolution is followed by mechanical resolution. A 3D Simplified Multi-Scale Model (SMSM) describing both magnetic and magnetostrictive anisotropies is used as the constitutive law of the material. The transformer core structure is modeled in 2D and an homogenization technique is implemented to take the anisotropic behavior of each layer into consideration and define an average behavior at each element of the finite element mesh. A three-layers transformer prototype is fabricated with Hi-B grain-oriented iron-silicon alloy. Experimental measurements are carried out and compared to the modeling results. Small discrepancies are observed and discussed.

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