Preliminary study on the methods for suppressing background interference in ultra-wideband partial discharge detection

The interferences often appear in partial discharge detection. Many methods have been developed to suppress interference. In order to decrease the influence of background signal on the frequency-domain analysis and to observe the characteristic peaks of the measured signal easier, we have studied some simple practical methods to suppress the background signals in ultra-wideband partial discharge detection. Mostly, the sampled signals include discharge signal and background noise, so a method to extract the discharge signal for frequency spectrum analysis was designed. And a D-value Method is also designed to process the signal data before and after discharge respectively. After data processing, a frequency spectrum of the discharge signal is available. It is obvious in practical use that these methods can suppress background interference effectively.