PATTERN RECOGNITION METHOD FOR PARTIAL DISCHARGE OF THREE-PHASE IN ONE ENCLOSURE TYPE ULTRAHIGH VOLTAGE GIS

摘要

A pattern recognition method for a partial discharge of a three-phase in one enclosure type ultrahigh voltage GIS. The method comprises the steps as follows: detecting a partial discharge of a three-phase in one enclosure type GIS using an ultrahigh frequency, and sampling a partial discharge signal using a UHF sensor; conducting noise elimination processing on the collected partial discharge signal using an improved wavelet threshold filtering method, so as to obtain a real partial discharge signal; extracting feature parameters of the sampled signal through an algorithm based on a phase analysis pattern; conducting dimension reduction processing on a feature space composed of the feature parameters using an improved kernel principal component analysis method, so as to obtain a feature parameter matrix subjected to the dimension reduction; and conducting pattern recognition on an insulation defect type of the GIS using a K-nearest neighbour classification algorithm based on a cluster idea. The pattern recognition method for a partial discharge of a three-phase in one enclosure type ultrahigh voltage GIS can overcome the defects of less functions, a small scope of application and poor accuracy in the prior art, thereby realizing the advantages of more functions, a wide scope of application and good accuracy.