Electric power transformers provide a link between the power transmission system and the distribution system. They transform the high voltage power (e.g. 138 kV) from the transmission system to the lower voltage (e.g. 25 kV) of the distribution system. These transformers are situated where electric power is used - frequently, close to people. Due to their hum and the noise of cooling fans they may cause intrusive noise levels. The noise emitted by transformers can be characterized as continuous noise.
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