Partial Discharge Characteristics and Risk Assessment Method for Oil-paper
Ke Wang · Proceedings of the CSEE · 2011
Partial discharge(PD) characteristics are focused to study the flat cavity defect development rule and risk assessment method for oil-paper.Firstly,the equivalent time-frequency(TF) analysis method,combined with fuzzy clustering method(FCM),was introduced to perform signal separation from mixed PD sources.Secondly,dimension reduction of PD conventional statistical characteristics and new PD features extraction were performed by using the factor analysis method.According to the new PD features at different aging stages,the risk evaluation of oil-paper defect was carried out by ID3 decision tree.Finally,a set of scheme was proposed to evaluate the risk caused by local defects,which solved two problems: one is separation and recognition of mix PD source,the other is extracting method of PD features that closely related to paper aging degree and diagnostic method.