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Abstract
Sound barriers are a type of measure most commonly used in the noise abatement of transformers. In the noise abatement project of substations, the design of sound barriers is restrained by the portal frames which are used to hold up outgoing lines from the main transformers, which impacts the noise reduction effect. If active sound barriers are utilized in these places, the noise diffraction of sound barriers can be effectively reduced. At a 110kV Substation, an experiment using a 15-channel active sound barrier has been carried out. The result of the experiment shows that the mean noise reduction value (MNRV) of the noise measuring points at the substation boundary are 1.5 dB (A). The effect of the active noise control system is impacted by the layout of the active noise control system, the acoustic environment on site and the spectral characteristic of the target area.
Highlights
Back in 1956, W.B.Convor from General ElectricCompany tried to utilize the active sound attenuation technology in controlling transformer noise
The result of the experiment shows that the mean noise reduction value (MNRV) of the noise measuring points at the substation boundary are 1.5
The effect of the active noise control system is impacted by the layout of the active noise control system, the acoustic environment on site and the spectral characteristic of the target area
Summary
Company tried to utilize the active sound attenuation technology in controlling transformer noise. Each active controller consists of reference sensor 5, error sensor 6, digital signal processing module 7 and secondary loudspeaker 8. When the primary sound source 1 radiates noises, reference sensor would collect the information of the primary sound field, and error sensor 6 would collect the information of the total sound field of the target controlling area, and the two signals. System control can be realized by operating the interface of control software in the computer
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