Power cable failure discharging sound waveform starting point calibration method
The invention discloses a power cable failure discharging sound waveform starting point calibration method, and belongs to the field of power cable failure detection. The calibration method includes the steps: 1 acquiring a sound signal by a sound-magnetic synchronization method and performing analo...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention discloses a power cable failure discharging sound waveform starting point calibration method, and belongs to the field of power cable failure detection. The calibration method includes the steps: 1 acquiring a sound signal by a sound-magnetic synchronization method and performing analog-digital conversion; 2 performing binary wavelet transformation on the sound signal; 3 performing soft threshold processing on the sound signal and eliminating noise in the sound signal; 4 performing inverse wavelet transformation and transforming the sound signal from a wavelet domain to a time domain; 5 searching a first data extreme point by the aid of a 3 standard deviation criterion; 6 calibrating a sound signal starting point. According to the power cable failure discharging sound waveform starting point calibration method, by the aid of a wavelet soft threshold noise eliminating technology and a waveform analysis technology based on signal features, the failure discharging sound waveform starting point can |
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