Ungar, E. E., and Gordon, C. G., “Vibration Challenges in Microelectronics Manufacturing,” Shock and Vibration Bulletin, 53(I):51-58 (May 1983). [Elias Klein Memorial Lecture] Colin G. Gordon and Lennart A. Swenson, “Power Transformer Noise—Prediction and Control”, Proceedings of Inter-Noise 78, pp. 323-328.65ed834e9c80e78034a899e748f7f633
May 10, 1978
Power Transformer Noise—Prediction and Control
Power transformers located in outdoor substations can be a significant source of environmental noise disturbance, especially during nighttime hours. The dominant characteristic of transformer noise is the low frequency “hum” generated within the magnetic core as a result of the magnetostrictive properties of the core steel. The core-generated noise consists of the harmonics of the fundamental frequency, 120 Hz (twice line frequency). The noise of a transformer is virtually independent of the load carried. The paper reports observations and findings of an extensive survey carried out by BBN and additional data provided by BPA and ESEERCO.