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A new approach to the critical induction in transformer cores

Abstract : 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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Submitted on : Tuesday, May 17, 2022 - 9:27:16 AM
Last modification on : Thursday, May 19, 2022 - 8:44:24 AM


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Guillaume Parent, Rémi Penin, Jean-Philippe Lecointe, Jean-François Brudny, Thierry Belgrand. A new approach to the critical induction in transformer cores. International Journal of Applied Electromagnetics and Mechanics, IOS Press 2016, 50 (4), pp.583-592. ⟨10.3233/JAE-150135⟩. ⟨hal-03350749⟩



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