Measurement and Separation of Equipment and Boundary Noise in Substations

The noise of substation comes from equipment vibration and boundary environment sound, which is mainly concentrated in the low frequency area. To control low frequency noise effectively, it is necessary to identify the noise source accurately and take corresponding measures. Taking Jingmen Substation as an example, this paper measures and analyzes the main transformer, reactor and boundary noise in the substation, and adopts a novel substation noise separation technology based on Conv-Tasnet to separate the substation multi-source noise. It is found that the influence of fan layout on noise control should be considered in the design of transformer cooling system to optimize the overall noise management strategy. For the reactor, the noise of the reactor is mainly propagated to both sides through the open edge, and the noise of the open edge without a firewall is about 10dB larger than that of the closed edge of the firewall. For the boundary, in the same position, the difference between the noise inside and outside the wall is large, because the sound insulation effect of the wall forms a sound shadow area below the wall. Therefore, when there is a sound environment sensitive building outside the wall, the noise measurement of the factory boundary must be based on the top of the wall. Finally, the multi-source separation test of substation noise based on Conv-Tasnet shows that Conv-Tasnet performs well in the separation of multi-source noise, ensuring the consistency of the separated noise and the target noise in the time domain and frequency domain.