Optimal configuration for hybrid control of indoor transformer noise

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Conference Proceeding
INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, 2017, 2017-January
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© 2017 Institute of Noise Control Engineering. All rights reserved. The noise of the indoor transformers sometimes radiates through heat dissipation channels. Taking both ventilation and noise cancellation into consideration, a dissipative muffler with staggered opening is proposed in this paper. To reduce the low frequency components of the transformer noise, active noise control (ANC) technique is applied in the muffler to improve the performance. Several factors which affect the noise attenuation of the integrated active and passive control muffler, including arrangements of the error sensors and the control sources, are analyzed. Numerical simulation and experiment results show that the muffler can reduce the transformer noise by 8 - 20 dB without ANC, and an extra noise reduction of 9-15 dB at 100 Hz, 200 Hz and 300 Hz when the ANC system is on. This kind of muffler can be applied for the ventilation channels of the sound insulation doors for indoor transformers.
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