What Are Anti-interference Technologies For PD Detection Of HV Switchgear?

During the partial discharge detection process of the high voltage switchgear, it is often affected by various interference factors such as thermal noise, system white noise, corona, etc., resulting in a decrease in the accuracy of the partial discharge detection results. Therefore, anti-interference is very important. The following GDZX introduces two anti-interference technologies for partial discharge detection of high-voltage switchgear. 

I Analysis of Wavelet Transform Technology 

In the process of detecting the partial discharge phenomenon of the high-voltage switchgear, it is often affected by various interference factors such as thermal noise, system white noise, corona, etc., resulting in a decrease in the accuracy of the partial discharge detection result. In order to prevent these problems, it is necessary to use the anti-interference technology during the detection of partial discharge of the high voltage switchgear to effectively deal with the interference source. As a very important anti-interference technology, wavelet transform has higher maturity than other technologies, and it has become an effective method to remove the influence of noise factors during the detection of partial discharge problems of high voltage switchgear. At this stage, the wavelet transform denoising method is mainly used, including the modulus maxima method. The devaluation method is simpler to apply, and has strong adaptability in the noise extraction work, which makes the partial discharge problem detection of the high voltage switchgear more smooth and accurate; because the program of the modulus maxima method is more complicated in the actual application process, Therefore, this method itself has a large signal reconstruction error, which is not commonly used. 

II FFT Transformation and Mathematical Morphological Analysis 

Under normal circumstances, this method is mainly suitable for the solution of the periodic narrow-band interference problem in the partial discharge phenomenon of the high-voltage switchgear, in view of its own high detection effect. Therefore, in the process of detecting the partial discharge of the high-voltage switchgear, the inspector needs to first expand the FET on the signal to obtain the actual distribution information of the signal spectrum, and then set a certain threshold value on each signal spectrum, which will exceed. The threshold is zeroed to eliminate narrowband interference problems. Because the FFT transform itself can only obtain the frequency domain features, the related information of the time domain features cannot be obtained, so that the relevant information of the partial discharge frequency of the high voltage switchgear cannot be fully reflected in the actual detection, which makes it unable to effectively process the non-stationary signal. At the same time, setting the threshold is a technical difficulty during the application of this method, especially in the partial discharge site of the high voltage switchgear. The technical method has a wide range of applications in the detection of partial discharge problems in high voltage switchgear.

During the detection of partial discharge of the high voltage switchgear, it is necessary to use the functional anti-jamming technology to effectively deal with the interference source. GDZX specializes in the production of high-voltage switchgear partial discharge tester, many types, different models, welcome to buy!