Tank-type circuit breaker partial discharge ultrasonic signal denoising and time difference identification method
The invention discloses a tank-type circuit breaker partial discharge ultrasonic signal denoising and time difference identification method. The method comprises the following steps: 1) acquiring a tank-type circuit breaker partial discharge ultrasonic signal by using an ultrasonic sensor; 2) select...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention discloses a tank-type circuit breaker partial discharge ultrasonic signal denoising and time difference identification method. The method comprises the following steps: 1) acquiring a tank-type circuit breaker partial discharge ultrasonic signal by using an ultrasonic sensor; 2) selecting an optimal wavelet function for analyzing the partial discharge ultrasonic signal of the tank-type circuit breaker based on the cross correlation coefficient, and adopting signal decomposition, threshold processing and signal reconstruction based on discrete wavelet transform to realize ultrasonic signal denoising; 3) acquiring a typical defect partial discharge ultrasonic PRPD map of the tank circuit breaker by using the denoised signal; and 4) adopting an energy criterion method to automatically calculate ultrasonic signal energy and extract signal time difference. Db14 is selected as an optimal wavelet function for analyzing the partial discharge ultrasonic signal of the tank-type circuit breaker based on a |
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