Magnetomechanical Vibrations of Three-Phase Three-Leg Transformer With Different Amorphous-Cored Structures

Chang, Yeong‐Hwa; Hsu, Chang-Hung; Chu, Huei-Lung; Tseng, Ching-Pei

doi:10.1109/tmag.2011.2146242

Cited by 54 publications

(20 citation statements)

References 12 publications

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“…The vibration characteristics of the coils agree with those reported in Ref. [20]. The relation between the coils' vibration signal on the surface of phase b and the square of load current per unit value is almost linear, which can be seen in Fig.…”

Section: Vibration Of Coils Caused By Load Currentsupporting

confidence: 89%

“…Chang et al [19] thought that an amorphous transformer with a toroidal core should have lower core vibration noise than the ordinary C-core transformer. This has motivated many researchers to reduce the vibration and noise of AMACDTs [2,20] . This paper focuses on the variation caused by magnetostrictive and electrodynamic forces at different positions on the tank and upper-bracket surface of AMACDT body to identify the correlations between vibration amplitude and frequency.…”

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confidence: 99%

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Reduction of vibration noise for amorphous metal alloy core distribution transformer

Liu

Zhang

et al. 2015

Trans. Tianjin Univ.

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Abstract：To understand the vibration noise behaviors of amorphous metal alloy core distribution transformer (AMACDT), a 10 kVA prototype was tested under no-load and short-circuit conditions, respectively. The vibration characteristics were described when rated voltage was applied to the secondary side, and the primary side was connected with different load resistances. The largest amplitude positions on the upper bracket and tank surfaces were recorded by vibration sensors arranged on the surface. A data-acquisition platform was set up for signal measurement. The vibration amplitude related to frequency was discussed, and experimental results indicated that the position with the largest amplitude accrued in the middle of the upper bracket and tank surface, at phases a and c, respectively. The experimental results suggest that magnetostrictive and electrodynamic forces play a major role in exciting the vibration noise. At the same time, some rib-reinforcements were welded on the upper bracket and tank surfaces to lessen the vibration energy, which reduced the noise. Keywords：distribution transformer； magnetostriction；electrodynamic force；amorphous metal core；vibra-tion； noise transmission Considering the fact that developing countries with huge population are consuming electrical power at everincreasing rates, the role of amorphous metal core distribution transformers(AMACDTs)on energy efficiency and reduction of CO 2 emissions is becoming significant [1] . As AMACDTs have the advantage of low no-load losses compared with orientation silicon-steel distribution transformers(OSDTs), their wide use can have a considerable impact on global energy-saving efforts [2] . However, a high noise level for AMACDTs is inevitable，which is generated mainly in transformer cores and coils by magnetostrictive and electromagnetic forces [3] .The primary source of noise in a transformer is the periodic mechanical deformation of transformer cores and coils under the influence of fluctuating electromagnetic flux [4] . The vibration of a transformer core is a result of its varying magnetostrictive strain by two times alternating frequency [5] . The periodic magneto motive force may cause the core laminations to strike against each other and produce noise. Moreover, the periodic mutual force can cause the current-carrying coils to vibrate if there are any loose turns therein [6] .During operation, cores and coils transmit vibrations to the transformer bracket surface through structureborne. The vibrations can also reach the tank surface, at positions where the cores and coils are attached and the space between the AMACDT body and tank, respectively. The vibration on the tank surface eventually radiates the noise into the exterior air. Yang [4] gave a review of the generation and transmission of vibration and noise in a transformer.Previous researchers [7] have investigated how to reduce the noise resulting from cores. Yao et al [8] and Somkun et al [9] show that vibration analysis of transTrans. Tianjin Univ. Vol.21 No.4 2015 -...

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Section: Vibration Of Coils Caused By Load Currentsupporting

confidence: 89%

mentioning

confidence: 99%

Reduction of vibration noise for amorphous metal alloy core distribution transformer

Liu

Zhang

et al. 2015

Trans. Tianjin Univ.

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“…The latter is caused by core vibrations which are more complex resulting from many phenomena. Up to now, several factors have been claimed to have relevance to the flux distribution and core vibrations, such as bolt holes [11], core clamping [12] and core structures [2]. Many works have been done at several levels:…”

Section: Sheet 'I'mentioning

confidence: 99%

“…iron-cobalt) could be a solution to reduce this supplementary mass of 3-phases transformers. Such prototypes generate unfortunately a loud noise in operation caused by the interaction between the transformer's magnetic stray field and the current-carrying winding loops [1] and also by periodic deformations of sheets linked with the structure of the transformer core [2] [3]. This deformation has two origins: i) elastic strain associated to magnetic forces appearing on the free surface and volume; ii) spontaneous magnetostriction depending on the local magnetic state of the material [4].…”

Section: Introductionmentioning

confidence: 99%

Homogenized Magnetoelastic Behavior Model for the Computation of Strain Due to Magnetostriction in Transformers

et al. 2016

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This paper deals with the prediction of the deformation of a multi-layer transformer core made of an assembly of anisotropic 'E-shaped' and 'I-shaped' sheets. This magneto-mechanical coupled problem is solved by a stepping finite element method sequential approach: magnetic resolution is followed by mechanical resolution. A 3D Simplified Multi-Scale Model (SMSM) describing both magnetic and magnetostrictive anisotropies is used as the constitutive law of the material. The transformer core structure is modeled in 2D and an homogenization technique is implemented to take the anisotropic behavior of each layer into consideration and define an average behavior at each element of the finite element mesh. A three-layers transformer prototype is fabricated with Hi-B grain-oriented iron-silicon alloy. Experimental measurements are carried out and compared to the modeling results. Small discrepancies are observed and discussed.

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“…A magnetic-mechanical strong coupling finite element model to simulate the magnetostrictive vibration effect is proposed in [14][15][16]. Meanwhile, the stress caused by bending and cutting will affect the magnetostrictive properties, which leads to the magnetic flux concentrated and vibration and noise of the core more severely in this area [17][18][19]. However, the Maxwell electromagnetic force is not considered in this model.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Vibration Analysis of Magnetically Controlled Reactor Considering DC Magnetic Flux

Ben

Chen

et al. 2020

IEEE Access

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The main factors of stress distribution in MCRs are the magnetostriction effect of the core materials and the magnetic force between gaps under DC bias excitation. This paper developed a coupling model for MCRs considering Maxwell magnetic force and magnetostriction under DC flux density biases. The constitutive equations of the magnetic field and strain field are constructed based on the magnetic property curves with a new measured and analyzed method to consider DC magnetic flux biases, which is the key contributions of this study. Then, the electromagnetic vibration properties of the MCR model are calculated and analyzed. To prove the validity of the proposed method, the vibration of a 4.4 kVar-220 V MCR is tested and analyzed. INDEX TERMS Magnetically controlled reactors, finite element analysis, electromagnetic vibration, magnetostriction.

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Magnetomechanical Vibrations of Three-Phase Three-Leg Transformer With Different Amorphous-Cored Structures

Cited by 54 publications

References 12 publications

Reduction of vibration noise for amorphous metal alloy core distribution transformer

Reduction of vibration noise for amorphous metal alloy core distribution transformer

Homogenized Magnetoelastic Behavior Model for the Computation of Strain Due to Magnetostriction in Transformers

Electromagnetic Vibration Analysis of Magnetically Controlled Reactor Considering DC Magnetic Flux

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