Relevance of magnetostriction and forces for the generation of audible noise of transformer cores

Weiser, B.; Pfützner, Helmut; Anger, Jan

doi:10.1109/20.908346

Cited by 172 publications

(88 citation statements)

References 14 publications

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“…Figure 33, the closer the transformer is to the monitoring point in the horizontal direction, the stronger the vibration is. By data contrasts between group (1, 4), (2,5), (3,6), it can be seen that when the transformer is at the edge, the vibration intensity of the monitoring point is only 50-60% of that when transformer is at the middle position due to vibration will be transmitted to the edge. Because of it, when the transformer is at central position, its impact range on the whole building is less than that at edge position.…”

Section: Six-layer Modelmentioning

confidence: 99%

“…Assume that the coordinate of its adjacent point C is (x + dx, y + dy, z + dz), and the corresponding displacements are ξ + dξ, η + dη, and ζ + dζ. The Taylor equation is used to decompose it, then the displacement difference between A and C point can be obtained as follows: (2) The Figure 2 is a simplified diagram of the object deformation. The ABCD in the figure represents the solid model before being subjected to the force, and A'B'C'D' is the solid model that produces the deformation after subjected to the force.…”

Section: Strain Analysis In Solidmentioning

confidence: 99%

“…The main source of the transformer's body noise is from the core and winding vibration [1][2][3][4][5][6]. The total vibration level on the transformer could be adequately described by the first few harmonics of 100 Hz [7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling Analysis on Propagation of Structure-Borne Vibration Caused by an Indoor Distribution Transformer in a Building and Its Control Method

Wang

Liang

et al. 2017

Applied Sciences

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Abstract:With the increase of urban population and electricity demand, in order to provide sufficient power to residents, distribution transformers are getting closer to residential buildings, and are even directly placed on the first floor or the basement of buildings due to space limitations. The vibration and noise with low frequency of mainly 50-250 Hz generated by the distribution transformers spread to rooms through beams, bricks, walls and other building structures, which inevitably damages the living environment. In this paper, through focusing on the frame of buildings, simulation models of the indoor distribution transformer vibrating in the structure field are built, including a two-layer model and a six-layer model. This paper simulates and analyzes the vibration response of the structural system, studies the propagation laws of the structure-borne sound caused by the transformer and quantitatively analyzes the attenuation characteristics of the vibration. Finally the prevention method of the structure-borne noise, called vibration isolation, is introduced and analyzed by the field test to evaluate the noise reduction effect.

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Section: Six-layer Modelmentioning

confidence: 99%

Section: Strain Analysis In Solidmentioning

confidence: 99%

See 1 more Smart Citation

Modeling Analysis on Propagation of Structure-Borne Vibration Caused by an Indoor Distribution Transformer in a Building and Its Control Method

Wang

Liang

et al. 2017

Applied Sciences

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“…Several papers have analyzed the vibration of cores due to magnetostrictive effect in 2D, some based the Principle of virtual work [3], and others based the equations of elasticity method in a similar way as thermal stresses [4][5][6]. The aim of this paper was to investigate a feasible way to determine the operating point of transformer cores within the vibration noise limit set by the government.…”

Section: Introductionmentioning

confidence: 99%

Design and Analyze the Optimum Operating Point between Magnetic Flux Density and Vibration Noise of Transformer Cores

Zhu¹,

Zhang²,

Yang³

et al. 2014

TOEEJ

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Base on the magnetization and magnetostriction measurement, this paper proposed a generalized 3D finite element numerical model, which can be used to analyze electromagnetic vibration of laminated cores including electromagnetism and magnetostriction effects. And then the acoustic field around the transformer was analyzed and tested, the results showed the model and analysis method were feasible. The work is helpful to estimate vibration noise level and then optimized design, choose suitable silicon steel and size in the design stage, which can reduce product development cycle and test cost.

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“…For instance, some authors have focused on the level of noise reduction in power transformers [7][8][9], others have investigated the reasons of audible noise in transformers and have developed techniques for their reduction [10], and others have proposed a diagnostic technique for power transformers based on core and coil vibrations [11]. In Colombia, electric utilities as CODENSA, EPSA and EPM started demanding compliance of the audible noise levels in the transformers installed in their electric networks [12,13].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic vibration noise analysis of transformer windings and core

Liu

Liao

et al. 2016

IET Electric Power Applications

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Analyses of transformer electromagnetic vibration noise are presented in this study. A finite element model is established which combines transient electromagnetic field analysis, mechanical field analysis and acoustic analysis to calculate the sound pressure level of the radiated noise around the transformer. Transient electromagnetic field analysis is performed to get the Lorentz, reluctance magnetic forces and magnetostriction according to Maxwell theory and virtual displacement principle. Mutual influence of strain and magnetisation has been considered. The main frequency components of harmonic electromagnetic excitations are analysed by Fourier transformation so as to carry out the harmonic response analysis and obtain the nodes displacements of the windings and core. The noise distribution is further calculated by acoustic analysis based on the achieved vibration data. Comparison of calculated results and measured data verifies that the combined noise calculating model is applicable for transformer noise prediction.

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Relevance of magnetostriction and forces for the generation of audible noise of transformer cores

Cited by 172 publications

References 14 publications

Modeling Analysis on Propagation of Structure-Borne Vibration Caused by an Indoor Distribution Transformer in a Building and Its Control Method

Modeling Analysis on Propagation of Structure-Borne Vibration Caused by an Indoor Distribution Transformer in a Building and Its Control Method

Design and Analyze the Optimum Operating Point between Magnetic Flux Density and Vibration Noise of Transformer Cores

Electromagnetic vibration noise analysis of transformer windings and core

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