Abstract
Investigation of audible noise characteristics of the main power apparatus in UHV GIS substations provides essential statistics for the noise prediction and control. Noise pressure level, spectrum and attenuation characteristics of the main transformers and high voltage (HV) reactors are measured and analyzed in this paper. The result shows that the main transformer and HV reactor have identical A-weighted equivalent sound pressure level. The medium- and low-frequency noises are the primary components in the spectral. More attention should be paid to the low-frequency bands in the noise control process. The noise of cooling fan has a large influence on that of the main transformer. Without the consideration of corona noise, the average A-weighted sound pressure level shows an overall decreasing trend with the increase of the propagation distance. Obvious interference phenomenon of the noises at 100 and 200Hz exists in the noise propagation process.
Highlights
Audible noise has become the attention focus of the inhabitants around the substations
Because no noise sources are in the northern open-space of the main transformer and the only single cooling fan is shut down when the measurement is conducted, the minimum LAeq of each transformer appears in the northern direction
As the northern and southern side of the main transformer is relatively open, the sound pressure level is not affected by the corona noise generated on the power transmission structures
Summary
Audible noise has become the attention focus of the inhabitants around the substations. The research on the characteristic of UHV substation noise is important and has practical significance in UHV power transmission project [1,2,3]. GIS equipment has numerous advantages, such as high reliability, less environmental impact and anti-electromagnetic interference. Another significant advantage of GIS lies in that it has no audible corona noise, which reduces the noise emission level of substations [4]. The noise characteristics of UHV substations are studied by some researchers [5]. Few research reports are observed about the noise characteristics of UHV GIS substations. The audible noise characteristics of 1000 kV GIS substation in Anhui province of China has been investigated. The spectrum distribution and attenuation characteristics generated by transformers and reactors were analyzed in detail, which can provide reference to the acoustic environment impact prediction and assessment of different types of UHV substation
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