The limitation of transformer noise

The paper describes a quantitative investigation into the subject of the noise emitted by transformers, and possible measures for its limitation. Permissible noise-levels for different situations are discussed and data for residential districts given. The generation of transformer noise is considered. Methods for limiting noise, applicable to a transformer as unit, are discussed, and results obtained with one based on the interception of vibration transmitted from core to tank are given. Methods applicable externally to a transformer are also discussed. The electromagnetic, thermal and economic considerations which arise in the employment of the various methods are discussed and examples are given.