Abstract
The objective of the project was to assess the severity of load-generated transformer noise in neighborhoods of the substation by performing the acoustic noise level dBA measurements around power transformer at different loads and distances. The results showed that 125 Hz frequency noise becomes dominant at ≈80% of the full-load with fans out of operation and varies linearly with the load. The regression equations between MVA loading and the average sound pressure level at 2 and 70 m away from the transformer were established. The increase in the average sound pressure level from no-load to full-load was found to be ≈3.60 dBA. When the fans were on, the increase in the average sound pressure level due to the load was negligible, as the fans' noise was the dominant noise source. It was determined if the fans operate in night, it may cause some complaints from people living near the substation. Copyright © 2010 John Wiley & Sons, Ltd.
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