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Vibro-acoustic signature treatment process in high-voltage electromechanical switching system

  • US 6,215,408 B1
  • Filed: 04/30/1999
  • Issued: 04/10/2001
  • Est. Priority Date: 01/22/1999
  • Status: Active Grant
First Claim
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1. A method of processing a vibro-acoustic signal emitted by a high-voltage switching system, comprising the steps of:

  • (a) converting the vibro-acoustic signal into a digital signal;

    (b) rectifying the digital signal to produce a rectified signal;

    (c) applying a convolutional filter with a spectral window on the rectified signal to produce a smoothed signal;

    (d) decimating the smoothed signal according to a predetermined decimation factor to produce a decimated signal representing an envelope of the vibro-acoustic signal;

    (e) carrying a time realignment of the decimated signal with respect to a reference signature to produce a realigned signal;

    (f) adding the realigned signal as a factor of a mean to produce the reference signature, the mean having a predetermined reference signal for initial factor;

    (g) adding the realigned signal as a factor of a mean to produce an actualized signature, the mean having the first realigned signal produced by the step (e) for initial factor;

    (h) calculating variances of the realigned signal with respect to the reference and actualized signatures; and

    (i) comparing the realigned signal with the actualized and reference signatures to detect a gradual behavior change or a sudden defect, taking the variances into consideration.

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