Joint detection method aiming to GIS (geographic information system) partial releasing defect identification and location
A defect identification and joint detection technology, applied in the detection field of GIS partial discharge defect identification and location, to achieve the effect of rapid and accurate analysis and judgment
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[0012] This method firstly measures the PD amount of GIS. Due to the various electromagnetic interferences existing in the GIS operation site, the collected signals are combined with time-frequency analysis and wavelet transform to remove noise interference, and then the collected PD spectrograms are modeled. Identification, to judge the nature, location and degree of insulation deterioration of the partial discharge of the defect; use the statistical feature method and the type feature method to extract the features of the partial discharge map to obtain the features that best reflect the nature of the classification, and then use the method of fuzzy identification. The extracted features are used to establish a feature database, and a membership degree discriminant function is established to realize fuzzy recognition. Finally, the X-ray detection technology is used to verify the location and properties of the defects detected by the PD spectrum. The digital subtraction method...
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