Vibro-acoustic signature treatment process in high-voltage electromechanical switching system
US6215408A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1999 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Apr 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2009/0061
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In the present method and apparatus for processing a vibro-acoustic signal emitted by a high-voltage switching system, the vibro-acoustic signal is converted into a digital signal. The digital signal is rectified and the resulting rectified signal is applied to a convolutional filter with a spectral window to produce a smoothed signal. The smoothed signal is decimated to produce a decimated signal representing an envelope of the vibro-acoustic signal. A time realignment of the decimated signal is carried out with respect to a reference signature to produce a realigned signal. Time deviation values generate an alarm if they exceed a limit threshold. The realigned signal is added as a factor of means providing a reference signature and an actualized signature. Variances of the realigned signal are calculated with respect to the reference and actualized signatures. The realigned signal is compared with the actualized and reference signatures to detect a gradual behavior change or a sudden defect, taking the variances into consideration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.