变压器内单一局放PRPD谱图统计参量的主成分分析

设计了4类由变压器油纸绝缘缺陷引起的"单一局放模式"模型:气隙放电模型、针板放电模型、介质表面金属杂质放电模型、油隙放电模型。通过标准化试验方法得到了不同模型局部放电相位分布模式(phase resolved partial discharge,PRPD模式)的二维谱图,并对谱图进行分析得到25个局部放电统计参量。采用主成分分析对统计参量的有效性进行了分析,得到了25个统计参量对不同类型放电信息表达的新特征参量组,以及对不同放电类型识别的贡献率。

Principal Component Analysis for Statistical Parameters of Phase Resolved Partial Discharge Spectra of Single Partial Discharge Pattern in Power Transformers

Four types of the single partial discharge (PD) pattern model led by the transformer's oil paper insulation defects are designed: air gap discharge model, needle plate discharge model, floating potential discharge model, and oil gap discharge model By the standard test methods, two dimension spectra for the four different models of phase resolved partial discharge (PRPD) patterns are obtained, and 25 statistical parameters of partial discharge are acquired by the spectrum analysis Then using principal component analysis (PCA) for the validity of the statistical parameters, new characteristic parameters groups are obtained on the expression of different types of discharge information from the 25 statistical parameters, as well as recognition of the contribution rate of the different discharges.