Patent
Vibro-acoustic signature treatment process in high-voltage electromechanical switching system
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TLDR
In this article, the authors present a method and apparatus for processing a vibro-acoustic signal (1) emitted by a highvoltage switching system, which is converted into a digital signal (3) and the resulting rectified signal (5) is applied to a convolutional filter with a spectral window to produce a smoothed signal (7).Abstract:
In the present method and apparatus for processing a vibro-acoustic signal (1) emitted by a high-voltage switching system, the vibro-acoustic signal (1) is converted into a digital signal (3). The digital signal (3) is rectified and the resulting rectified signal (5) is applied to a convolutional filter with a spectral window (6) to produce a smoothed signal (7). The smoothed signal (7) is decimated to produce a decimated signal (9) representing an envelope of the vibro-acoustic signal (1). A time realignment of the decimated signal (9) is carried out with respect to a reference signature (13A) to produce a realigned signal (11). Time deviation values generate an alarm if they exceed a limit threshold. The realigned signal (11) is added as a factor of means providing a reference signature (13A) and an actualized signature (13B). Variances (15A, 15B) of the realigned signal (11) are calculated with respect to the reference and actualized signatures (13A, 13B). The realigned signal (11) is compared with the actualized and reference signatures (13A, 13B) to detect a gradual behavior change or a sudden defect, taking the variances (15A, 15B) into consideration.read more
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References
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