Electromagnetic vibration noise analysis of transformer windings and core

Hu, Jingzhú; Liu, Dichen; Liao, Qi; Yang, Yan; Shan-shan, Liang

doi:10.1049/iet-epa.2015.0309

Cited by 66 publications

(25 citation statements)

References 21 publications

(20 reference statements)

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“…Therefore, rather than use the simple mass-spring analysis, we proposed a numerical simulation using a 3D model [10]. Some other papers also proposed 3D model simulations of the transformer noise [11] [12] [13] [14].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Load Noise Components in Small Core-Form Transformers

Yoshida

Hoshino

Murase³

et al. 2021

IEEE Trans. Power Delivery

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We propose load noise analysis components for small core-form transformers (1 MVA-20 MVA) using computational fluid-structure coupled calculations that consider the electromagnetic force, transformer structure and fluid (oil). The proposed technique has two beneficial aspects: coil modeling using shell elements of the finite element method (FEM), and acoustic noise analysis using a combination of boundary element method transmission path simulation and FEM structural simulation. The shell element model, which includes structural bending information, is less computationally intensive for simulations than solid models because it uses larger element sizes. Lighter simulations enable easier redesign for noise reduction. Additionally, division of the simulation process into individual structural vibrations, transmission paths, and radiation processes makes it easier to find a remodeling point without performing a complete simulation. We illustrate the importance of avoiding coincidence of the natural frequencies of the coils and the electromagnetic force and present a practical noise reduction study. This technique can be implemented using a light simulation that was proposed to confirm the remodeling effects. Using the proposed analysis method along with a ray tracing method, we can construct a frontloading design simulation tool to determine the transformer specifications and the substation's geographical features.

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Section: Introductionmentioning

confidence: 99%

“…In [12] and [13], the cores, the winding coils, the insulation oil, and the tank were analyzed using a 3D solid FEM model, so a huge number of model elements would have to be calculated for regular routine works of small core-form transformers..…”

Section: Introductionmentioning

confidence: 99%

Analysis of Load Noise Components in Small Core-Form Transformers

Yoshida

Hoshino

Murase³

et al. 2021

IEEE Trans. Power Delivery

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“…This study showed the relationship between total harmonic distortion (THD) and the change in load noise but did not predict the load noise. On the other hand, electromagnetic, structural, and acoustic analyses of noise, considering the windings and cores of transformers are shown in [6], [7] by applying 3-dimensional finite element analysis . This method may provide accurate predictions of load noise, but it is difficult to expect results in a short time because its pre-processing and computing times are relatively long.…”

Section: Introductionmentioning

confidence: 99%

Load Noise Prediction of High-Voltage Transformers by Equation Applying 3-D EMCN

et al. 2020

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This paper proposes a method for predicting the load noise of high-voltage (HV) transformers. When the transformer is loaded, the electromagnetic force is generated by the interaction between electric and magnetic fields. This force, the so-called Lorentz force, induces the vibration of the winding structure causing the load noise of transformer. Therefore, calculating the Lorentz force plays a crucial role in predicting the load noise. Herein, a 3-dimensional equivalent magnetic circuit network (3-D EMCN) is applied to calculate the Lorentz force, instead of 3-dimensional finite element analysis (3-D FEA) to shorten the computation time. Subsequently, considering the relationship between the sound pressure and the Lorentz force, the calculated force can be applied in the equation for the sound pressure level (SPL), which represents the relative sound pressure on a logarithmic scale. The formula for the sound pressure varies depending on the sound source model. The source model of load noise can be represented as a dipole source because the structure of the transformer windings is considered as an unbaffled speaker. The transformer parameters identified to affect the load noise are additionally considered for more accurate prediction of load noise. The parameters identified to increase the load noise are simply multiplied to the equation, whereas those with the opposite effect are multiplied inversely. Finally, after this compensation process, the accuracy of the load noise prediction equation is calculated as the standard deviation of the differences between the experimental and calculated results.

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“…Noise is an inherent characteristic of transformers that cannot be totally eliminated due to the vibrations produced in their core by the magnetostriction effect [14,15], and in the winding by the effects of leakage flux [16][17][18][19]. Consequently, it is necessary to verify the product in accordance to the audible noise limits.…”

Section: Introductionmentioning

confidence: 99%

Evaluación del nivel ruido audible en transformadores de distribución usando el Método de Presión Sonora

Mina-Casaran

Fernando-Navas²,

Echeverry

2017

Rev. Fac. Ing.

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In this paper the results of audible noise measurements to ten no-load distribution transformers are presented using the sound pressure method. The tests were done in the Audible Noise Laboratory of Universidad del Valle, according to the requirements described in the Colombian Technical Standard NTC 5979. The tests allowed to verify the conformity of the product in respect with the audible noise limits established in the Colombian Technical Standard NCT 5978. In addition, it was possible to identify the effect of noise emissions of two transformers when making variations of voltage in the power source. It was found that the noise level emitted by the transformers under test is considerably lower than the limits established in the standard and it is significantly affected by the voltage of the source supply.

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Electromagnetic vibration noise analysis of transformer windings and core

Cited by 66 publications

References 21 publications

Analysis of Load Noise Components in Small Core-Form Transformers

Analysis of Load Noise Components in Small Core-Form Transformers

Load Noise Prediction of High-Voltage Transformers by Equation Applying 3-D EMCN

Evaluación del nivel ruido audible en transformadores de distribución usando el Método de Presión Sonora

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