Reduction of Power Transformer Core Noise Generation Due to Magnetostriction-Induced Deformations Using Fully Coupled Finite-Element Modeling Optimization Procedures

Liu, Mingyong; Hubert, Olivier; Mininger, Xavier; Bouillault, Frédéric; Bernard, Laurent; Waeckerlé, Thierry

doi:10.1109/tmag.2017.2687409

Cited by 18 publications

(10 citation statements)

References 37 publications

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“…Therefore, it is necessary to verify, whether anisotropy would have relative influence on the results of the magnetostriction model since it is present in magnetic cores of actual large power transformers [9]. As verification, two types of magnetic core anisotropy are used.…”

Section: Research On Magnetic Core Anisotropy Of Proposed Modelmentioning

confidence: 99%

Modelling of magnetostriction of transformer magnetic core for vibration analysis

Marks

Vītoliņa

2017

Open Physics

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Magnetostriction is a phenomenon occurring in transformer core in normal operation mode. Yet in time, it can cause the delamination of magnetic core resulting in higher level of vibrations that are measured on the surface of transformer tank during diagnostic tests. The aim of this paper is to create a model for evaluating elastic deformations in magnetic core that can be used for power transformers with intensive vibrations in order to eliminate magnetostriction as a their cause. Description of the developed model in Matlab and COMSOL software is provided including restrictions concerning geometry and properties of materials, and the results of performed research on magnetic core anisotropy are provided. As a case study modelling of magnetostriction for 5-legged 200 MVA power transformer with the rated voltage of 13.8/137kV is conducted, based on which comparative analysis of vibration levels and elastic deformations is performed.

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Section: Research On Magnetic Core Anisotropy Of Proposed Modelmentioning

confidence: 99%

Modelling of magnetostriction of transformer magnetic core for vibration analysis

Marks

Vītoliņa

2017

Open Physics

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“…Transformer noise is caused by a phenomenon that causes a part of a magnetic sheet to extend itself when magnetized. Commonly stated, there are two explanations for the noise of the core: 1) magnetostrictive force of the silicon steel sheet and 2) vibration of the core [7]- [9]. Correct analysis of the entire vibration of the core is one of the main difficulties in the research of transformer's noise.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Vibration Characteristics of Amorphous Metal Alloy Core Dry-type Distribution Transformer

Romaric

Liu

Kong

2022

Trans. Electr. Mach. Syst.

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Large power transformers have severe vibration and noise problems. Thus, as the source of noise, it is vitally important to have accurate core vibration calculations. The calculation of the vibration is incredibly difficult to consider the complex propagation pathway of the vibration in the clamp and the Amorphous Metal Alloy Core Distribution Transformer (AMACDT). To understand the vibration characteristics of AMACDT, this manuscript provides a different approach on investigation of the vibration characteristics of an SCBH15-200/10 type. Based on the vibration characteristics calculation and displacement of an Amorphous Metal Alloy Core Distribution Transformer (AMACDT), they are obtained and solved using Finite Element Analysis software (FEA). Conferring to the outcomes of the vibration analysis, the method by adding bar-reinforcements on the upper clamp of transformer is proposed to lessen the vibration amplitude. To verify the usefulness and application of the suggested approach, the analytical results are obtained. The suggested approach is analyzed with those of experimental.

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“…Indeed, the response of a magnetic or dielectric material, if it is at first order function of the magnetic field or the electric field, also depends very strongly on the applied stresses [16,15]. These coupling effects can sometimes constitute an issue (they are for example responsible for part of the vibrations of rotating machines or the noise emitted by electrical transformers [41]), they can also be exploited to serve as a basis for the design of innovative devices for energy conversion, health control of structures or actuators [54], and even for the design of new materials (often composites) [46].…”

Section: Introductionmentioning

confidence: 99%

Integrity bases for cubic nonlinear magnetostriction

Taurines¹,

Olive²,

Desmorat³

et al. 2020

Preprint

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A so-called smart material is a material that is the seat of one or more multiphysical coupling. One of the key points in the development of the constitutive laws of these materials, either at the local or at the global scale, is to formulate a free energy density (or enthalpy) from vectors, tensors, at a given order and for a class of given symmetry, depending on the symmetry classes of the crystal constituting the material or the symmetry of the representative volume element. This article takes as a support of study the stress and magnetization couple (σ σ σ, m m m) involved in the phenomena of magnetoelastic coupling in a cubic symmetry medium. Several studies indeed show a non-monotonic sensitivity of the magnetic susceptibility and magnetostriction of certain soft magnetic materials under stress. Modeling such a phenomenon requires the introduction of a second order stress term in the Gibbs free energy density. A polynomial formulation in the two variables stress and magnetization is preferred over a tensorial formulation. For a given material symmetry class, this allows to express more easily the free energy density at any bi-degree in σ σ σ and m m m (i.e. at any constitutive tensors order for the so-called tensorial formulation). A rigorous and systematic method is essential to obtain the high-degree magneto-mechanical coupling terms and to build a free energy density function at any order which is invariant by the action of the cubic (octahedral) group. For that aim, theoretical and computer tools in Invariant Theory, that allow for the mathematical description of cubic nonlinear magneto-elasticity, are introduced. Minimal integrity bases of the invariant algebra for the pair (m m m, σ σ σ), under the proper (orientation-preserving) and the full cubic groups, are then proposed. The minimal integrity basis for the proper cubic group is constituted of 60 invariants, while the minimal integrity basis for the full cubic group (the one of interest for magneto-elasticity) is made up of 30 invariants. These invariants are formulated in a (coordinate free) intrinsic manner, using a generalized cross product to write some of them. The counting of independent invariants of a given multi-degree in (m m m, σ σ σ) is performed. It is shown accordingly that it is possible to list without error all the material parameters useful for the description of the coupled magnetoelastic behavior from the integrity basis. The technique is applied to derive general expressions Ψ ⋆ (σ σ σ, m m m) of the free energy density at the magnetic domains scale exhibiting cubic symmetry. The classic results for an isotropic medium are recovered.

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Reduction of Power Transformer Core Noise Generation Due to Magnetostriction-Induced Deformations Using Fully Coupled Finite-Element Modeling Optimization Procedures

Cited by 18 publications

References 37 publications

Modelling of magnetostriction of transformer magnetic core for vibration analysis

Modelling of magnetostriction of transformer magnetic core for vibration analysis

Investigation on Vibration Characteristics of Amorphous Metal Alloy Core Dry-type Distribution Transformer

Integrity bases for cubic nonlinear magnetostriction

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