Reduce Subjective Annoyance from Transformer Noise by the Method of Sound Adjustment and Control

Li, Zhengguang; Di, Guoqing

doi:10.3813/aaa.918964

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…However, due to the limitations of the working characteristics of the transformer, this method does not meet the requirements for reduced operational noise; thus, a second transformer noise control method was developed in which the transmission of the noise generated by the operation of the transformer is controlled. [12][13][14] Aiming at different frequencies of transformer noise, Ramsis S. Girgis proposed a more accurate calculation method for transformer noise and guided the transformer design based on this method, which improves transformer noise from the design stage. 15 According to the noise characteristics of the cooling facilities supporting the transformer, a targeted noise reduction transformation plan is proposed.…”

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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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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“…Transformer noise falls in the category of low-intensity and low-frequency noise (8,9). The frequency of sound generated by transformers under normal operation is primarily concentrated in the 50–800 Hz range, while the intensity of the sound transmitted to surroundings is typically <70 dB (10,11).…”

Section: Introductionmentioning

confidence: 99%

Effect of transformer noise on the neurophysiology of SD rats

Zou

Zhang

et al. 2019

Exp Ther Med

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Transformer noise is a type of environmental sound that causes discomfort to individuals. The aim of the present study was to determine the effect of relatively long-term periods of transformer noise on the behavior and neurophysiology of SD rats. A total of 90 healthy SD rats with normal hearing were randomly divided into two experimental groups (65 and 60 dB group) and a control group. The experimental groups were exposed to recorded transformer noise for 8 weeks (sound level limits: 65 or 60 dB) and the control group was maintained under the same conditions without noise stimulation. Changes in physiological growth (weight tests), behavior (tail suspension and open field behavior tests) and neurophysiology (glutamate, γ-aminobutyric acid, dopamine, 5-hydroxytryptamine, the morphologies of hippocampi) following noise exposure were recorded and compared. The results revealed that rats exhibited normal physiological growth, with no significant difference between the experimental and control groups. Following noise exposure, no significant differences were observed in the results of behavioral experiments (tail suspension and open field behavior tests) between the experimental and control groups. In addition, there were no significant differences in glutamate, γ-aminobutyric acid, dopamine and 5-hydroxytryptamine levels or in the morphologies of hippocampi between groups. In conclusion, exposure to transformer noise with a sound level limit of 65 dB sound pressure level (SPL) or 60 dB SPL (spectral range, 100–800 Hz) for 8 weeks (10 h/day) had no significant impact on the behavior and neurophysiology of SD rats.

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“…1 However, with the acceleration of the urbanization process, new residential blocks gradually take shape around substations; due to the size reduction of the noise attenuation areas, power substation noise problems have emerged. Therefore, since the power transformer is the primary sound source inside a power substation, 2,3 analysis of the acoustic characteristics of the power transformer is necessary for substation noise suppression and soundscape planning for the surrounding residential blocks.…”

Section: Introductionmentioning

confidence: 99%

Acoustic characteristic analysis of power transformers in urban communities based on a combined finite and boundary element method

Ying

Wang

Wang³

et al. 2019

Indoor and Built Environment

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Power transformers in substations are common sources of noise in residential areas of neighbourhoods. A quantified and visualized analysis of the power transformer acoustic characteristics is a prerequisite for the suppression of audible noise from the corresponding substation. In this study, based on a combined finite and boundary element method, a full-sized 3D power transformer multiphysics coupling model, which is aimed at realizing high accuracy and improving the computational efficiency, was developed. After validation of the numerical method using comparative tests, profile analyses in the near-field and far-field in the extended planes and three-dimensional areas of a power transformer were conducted to characterize the external acoustic field. The calculation results included the distribution of the spatial sound pressure levels of the power transformer at multiple levels in the frequency domain. These spatial sound pressure levels can be used to guide the efficient measurement of the external acoustic field of a power transformer and the soundscape planning around a substation, and the differentiated design of the sound absorption structure inside a substation.

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Reduce Subjective Annoyance from Transformer Noise by the Method of Sound Adjustment and Control

Cited by 7 publications

References 22 publications

Analysis of the characteristics of noise from substations in buildings

Analysis of the characteristics of noise from substations in buildings

Effect of transformer noise on the neurophysiology of SD rats

Acoustic characteristic analysis of power transformers in urban communities based on a combined finite and boundary element method

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