An Ultrahigh Voltage Shunt Reactor Acoustic Signal Separation Method Based on Masking Beamforming and Underdetermined Blind Source Separation

There are many types of acoustic sources in the ultrahigh voltage (UHV) substation. The acoustic signals of UHV shunt reactors obtained by direct measurement include many other phase reactor acoustic signals that are very similar to the subjected reactors in frequency domain characteristics, as well as cooling fans and random noise. An UHV shunt reactor acoustic signal separation method based on beamforming and undetermined blind source separation was proposed. In this method, the existing beamforming is improved to masking beamforming, which can separate those acoustic components differing from the spatial characteristics of the subjected reactor. Then, undetermined blind source separation was adopted to remove the acoustic components which are different from the frequency domain characteristics of the subjected reactor. Laboratory and substation tests were conducted, respectively. The results show that the method proposed in this research can obtain the acoustic signal with a power spectrum similarity of 0.924 from the original mixed acoustic signal with the power spectrum similarity of 0.617, which can verify the feasibility of the method.