Transformers emit a distinctive hum which is continuous, of constant level and irrespective of load and which consists of discrete frequency components. Although over the years the noise produced by transformers of given rated power has been reduced, the problem has become severe owing to the increasing size and number of transformers and the tendency for these to be located closer to load centres. The result has been that the likelihood of annoyance to residents has become potentially greater and that more and more precautions now need to be taken at the planning stage. Complaints can to a large extent be forestalled provided suitable estimates are made at this stage and provided measures are taken to limit the noise.
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