Noise generated by model step lap core configurations of grain oriented electrical steel

Snell, D.

doi:10.1016/j.jmmm.2008.04.169

Cited by 7 publications

(3 citation statements)

References 3 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: 90%

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: 90%

A new approach to the critical induction in transformer cores

Parent

Penin

Lecointe

et al. 2016

JAE

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“…First, we examine how the joint structure affects noise. There are existing publications on how noise depends on the joint structure and size of electrical steel sheets . In this paper, we clarify the effects of the joint structure and the number of laminations.…”

Section: Introductionmentioning

confidence: 98%

Variation of Noise and Magnetostriction Associated with Joint Types of Transformer Core

Mizokami

Kurosaki

2015

Electrical Engineering Japan

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In order to study the acoustic noise generated by transformer cores, the impacts of the types of core joint and the number of laminations per layer on noise levels were investigated. In addition, localized magnetostrictions on transformer cores were measured with strain gages, and the differences caused by the types of core joint were investigated. The following were obtained as the results. The step-lap configuration reduced noise levels in comparison with the conventional lap. An increase of the number of laminations per layer raised the noise levels. The differences occurred in the higher harmonic components than the fundamental component. There was a certain connection between localized magnetostriction and noise with respect to the types of core joint. The magnetostriction measured on a single sheet sample with sinusoidal excitation had less correlation with the localized magnetostriction measured on the core. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 194(2): 1-8, 2016; Published online in Wiley Online Library (wileyonlinelibrary.com).

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“…The ferromagnet will be accompanied by the movement of the magnetic domain wall and the rotation of the magnetic moment of the magnetic domain in the magnetization process, and magnetostriction mainly occurs in the rotation of the magnetic moment of the magnetic domain. On the one hand, some methods about reducing the noise have been developed by means of adjusting the overlapping method and clamping pressure on the cores [18][19][20][21]. On the other hand, magnetostrictive properties are being studied by carrying out some experimental tests on a single steel sheet under an alternating magnetization [22,23].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Magnetic and Magnetostrictive Characteristics of Transformer Core Based on Triaxial Strain Gauge and B-H Vector Sensor

Wang,

Fan,

et al. 2023

Sensors

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As is well known, the magnetostrictive phenomenon of electrical steel sheet is the main source of electricity in equipment such as transformers. The magnetostrictive characteristic of the actual transformer core is more complicated than that of single-sheet steel. The magnetostriction phenomenon of the transformer core cannot be fully understood by studying only a single piece of electrical steel, so it is necessary to study the local magnetic characteristics of the transformer directly. In this paper, two-limb, one-phase transformer core with a multi-step-lap construction was assembled, a laminated magnetostrictive testing system based on triaxial strain gauges was built, and the local magnetic characteristics were studied using a self-developed B-H vector sensor. The magnetostrictive and magnetic properties in different local regions were measured and analyzed under several magnetization patterns, and the influence of DC bias on the magnetostrictive property of the corner, yoke, and limb of the core was investigated. The influence of the position of the clamp on the magnetostriction of the transformer core was also studied. The magnetostrictive strain of the single sheet and laminated core was compared and discussed. The results showed that the strain caused by the interaction between laminations in this area can be effectively reduced when clamping in the middle of the yoke.

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Noise generated by model step lap core configurations of grain oriented electrical steel

Cited by 7 publications

References 3 publications

A new approach to the critical induction in transformer cores

A new approach to the critical induction in transformer cores

Variation of Noise and Magnetostriction Associated with Joint Types of Transformer Core

Measurement of Magnetic and Magnetostrictive Characteristics of Transformer Core Based on Triaxial Strain Gauge and B-H Vector Sensor

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