Multi-field Coupling Simulation and Experimental Study on Transformer Vibration Caused by DC Bias

Wang, Jingang; Gao, Can; Xu, Duan; Mao, K. F.

doi:10.5370/jeet.2015.10.1.176

Cited by 16 publications

(15 citation statements)

References 11 publications

(10 reference statements)

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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: Structure-borne Sound Control Methodsmentioning

confidence: 99%

“…T xx T xy T xz T yx T yy T yz T zx T zy T zz (3) where T xx represents the stress acting on the x-plane and pointing to the x-axis, T xy represents the stress acting on the x-plane and pointing to the y-axis, and the other quantities are similarly labeled. T ij (i, j = x, y, z) represents the stress in all directions.…”

Section: Acoustic Equation In Solidmentioning

confidence: 99%

“…Although there has been a development of methods of prediction and measurement of structureborne sound, there still remains a shortfall in methods of predicting noise from vibrating machines in contact with building elements, which transmit vibrations and radiate sound [3], especially the specific study on the distribution transformer's vibration and noise in the building. This paper focuses on frame structure, and builds simulation models of the indoor distribution transformer's vibration in the structure field.…”

Section: Introductionmentioning

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%

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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: Structure-borne Sound Control Methodsmentioning

confidence: 99%

Section: Acoustic Equation In Solidmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Hitherto, some efforts have been devoted to investigate the vibration and noise characteristics of power transformers under DC bias conditions [15][16][17][18][19][20][21][22]. In these studies, the time-and frequency-domain characteristics of transformer noise and vibration in DC bias condition are tested, but only amplitude variation is not enough to recognize DC bias because of the inexplicit features and recognition methods [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of DC Bias in Power Transformers Using Vibration Feature Extraction and a Pattern Recognition Method

Zhou

et al. 2018

Energies

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DC bias is a great threat to the safe operation of power transformers. This paper deals with a new vibration-based technique to diagnose DC bias in power transformers. With this technique, the DC bias status of power transformers can be automatically recognized. The vibration variation process of a 500 kV autotransformer is tested under the influence of DC bias in the monopole trail operation stage of a ±800 kV HVDC transmission system. Comparison of transformer vibration under normal and DC-biased conditions is conducted. Three features are proposed and are validated by sensitivity analysis. The principal component analysis method is employed for feature de-correlation and dimensionality reduction. The least square support vector machine algorithm is used and verified successful in DC bias recognition. A remote on-line monitoring device based on the proposed algorithm is designed and applied in field DC bias diagnosis of power transformers. The suggested diagnostic algorithm and monitoring device could be useful in targeted DC bias control and improving the safe operation level of power transformers.

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In Situ Adjustable Nanogaps and In‐Plane Break Junctions

et al. 2023

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The ability to precisely regulate the size of a nanogap is essential for establishing high‐yield molecular junctions, and it is crucial for the control of optical signals in extreme optics. Although remarkable strategies for the fabrication of nanogaps are proposed, wafer‐compatible nanogaps with freely adjustable gap sizes are not yet available. Herein, two approaches for constructing in situ adjustable metal gaps are proposed which allow Ångstrom modulation resolution by employing either a lateral expandable piezoelectric sheet or a stretchable membrane. These in situ adjustable nanogaps are further developed into in‐plane molecular break junctions, in which the gaps can be repeatedly closed and opened thousands of times with self‐assembled molecules. The conductance of the single 1,4‐benzenediamine (BDA) and the BDA molecular dimer is successfully determined using the proposed strategy. The measured conductance agreeing well with the data by employing another well‐established scanning tunneling microscopy break junction technique provides insight into the formation of molecule dimer via hydrogen bond at single molecule level. The wafer‐compatible nanogaps and in‐plane dynamical break‐junctions provide a potential approach to fabricate highly compacted devices using a single molecule as a building block and supply a promising in‐plane technique to address the dynamical properties of single molecules.

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Multi-field Coupling Simulation and Experimental Study on Transformer Vibration Caused by DC Bias

Cited by 16 publications

References 11 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

Diagnosis of DC Bias in Power Transformers Using Vibration Feature Extraction and a Pattern Recognition Method

In Situ Adjustable Nanogaps and In‐Plane Break Junctions

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