Evaluation and different control methods of the transformer noise (Literature survey)

Boteva, Velichka; Tsvetkov, Hristo; Botev, Yordan

doi:10.1109/elma.2017.7955449

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…In this paper, we calculated the sound radiation efficiency of a typical distribution transformer by a validated BEM model. Through the analysis of the factors affecting the radiation efficiency of transformer structures, further understanding of its radiation features was concluded as: (1) The sound radiation efficiency of a typical distribution transformer at high frequency is obviously higher than that at low frequency, however, it does not increase monotonously with frequency. In the high-frequency band, the radiation efficiency fluctuates around the value of 1.0.…”

Section: Discussionmentioning

confidence: 99%

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Study on the Sound Radiation Efficiency of a Typical Distribution Transformer

Wang

Jin

Cai³

et al. 2021

IEEE Access

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In the realm of power grids environmental protection, low-frequency harmonic noise radiated from transformers has always been the focus of attention for decades. The existing noise control technologies, such as traditional noise barriers, sound insulation enclosures, and damping panels, not only occupying a large space but also causing difficulties in heat dissipation and daily maintenance of transformers. Therefore, explorations on the theory and design of low-noise power transformers become particularly necessary. In this paper, we started from the concept of acoustic radiation efficiency and discussed the radiation efficiency of a typical distribution transformer with radiators. It is found that the overall radiation efficiency is reduced below 230Hz (low-frequency band) due to radiator barriers compared with that of the flat transformer tank. Furthermore, the phase effect of vibration distribution was also studied with a validated BEM code, inspired by the "acoustic short circuit" phenomenon. It is verified that the acoustic short circuit phenomenon truly exists for a typical transformer enclosure and affects its sound radiation. These supporting results might lead to a promising noise reduction technology from the perspective of radiation control of transformer tanks, i.e. acoustic metamaterials for noise source phase control.

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Section: Discussionmentioning

confidence: 99%

“…Attempts to design low-noise transformers have been focused on the control of core and winding vibration [1] . Silicon steel sheets made of modern Hi-B materials were testified with lower MS level, which both reduced its core loss and noise emission [2] .…”

Section: Introductionmentioning

confidence: 99%

Study on the Sound Radiation Efficiency of a Typical Distribution Transformer

Wang

Jin

Cai³

et al. 2021

IEEE Access

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“…The low-frequency noise emitted by a transformer can spread very far and is difficult to eliminate. 5,6 Although the noise generated by fans and other equipment is mainly highfrequency noise, it is relatively easy to manage because it attenuates very quickly. Compared with other forms of noise, low-frequency noise causes more intense discomfort which can result in physiological and psychological damage.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the characteristics of noise from substations in buildings

Liu

et al. 2021

Building Services Engineering Research and Technology

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The urbanization has resulted in an increasing number of transformer stations, which has resulted insignificant building noise problems. However, noise problems persist because of inadequate noise characterization and the use of imperfect noise evaluation indexes for centralized substations. Based on this problem, a transformer vibration noise coupling analysis method based on empirical mode decomposition (EMD) and spectrum analysis is proposed in this study. The proposed method accurately and effectively screens and characterizes transformer noise and provides a theoretical basis for transformer noise reduction. To verify the effectiveness of the proposed method, a transformer was reconstructed as an example. It was found that the low-frequency noise from the transformer was mainly caused by vibrations with a frequency below 500 Hz, particularly frequencies of 300 Hz and 100 Hz and 50 Hz. Through the calculation and analysis of eigenvalues, the noise reduction measures focusing on vibration reduction were proposed. In the end, a noise reduction of 10 dB was achieved, which meets the comfort requirements. This method can accurately and effectively identify the characteristics of transformer noise, which makes up for the insufficiency of transformer characteristics analysis in the past. Provide guidance for perfecting transformer noise evaluation index. Practical implication: The noise problem caused by substations is getting more and more serious. Conventional noise detection and noise reduction methods can no longer meet people’s requirements for sound comfort. The coupling analysis method of vibration and noise based on EMD and spectrum analysis proposed in this study can effectively extract the characteristics of transformer noise. It provides theoretical support for the noise reduction transformation of transformers, and solves the problem that the current engineering noise reduction transformation has no theoretical basis. Noise characteristic analysis can make up for the shortcomings of existing acoustic comfort indicators that only use sound pressure level as the evaluation indicator.

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