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Direct on-site measurement of individual noise sources in AC substations is challenging, since the measured audible noise is a mixed result of diverse noise sources in the substation. In this paper, the audible noise of substation is divided into three categories: body, cooling device and corona noises. According to the noise discrepancies in time and frequency domain, the pass- and stop-band comb filters are designed, respectively, to obtain the body noise and the mixed noise of the cooling device and corona, from which the corona noise is separated out with speech enhancement technique based on spectral subtraction for its short-time and impulsive characteristics. The methodology is validated by application in the noise separation of a 500 kV AC substation.

Separation Methodology Investigation of the Audible Noise in AC Substations