Investigate and Control of Power Transformer Noise

The importance and recent achievements in the field of noise control of power transformer are expounded in this paper. Oscillation is presented as the reason for the transformer and cooling system noise. The methods used in transformer noise research are summed up. Generally speaking, far-field radicalization noise can be analyzed by summing up statistic data and setting calculating model, and sound intensity method is more accurate in measuring noise level of a transformer compared with traditional sound pressure method. The measures for controlling the transformer noise are introduced in detail. High-quality silicon-steel is suggested to be used, as well as adopting some effective measures when design, machining and install transformers. Assuasive equipments, muffler, sound insulation board and isolation booth, which will result attenuation in noise transmission, are proposed in order to reducing noise. Lastly but not the least important, opinions on the trend of the transformer noise control are bring forward.