油纸绝缘老化的超宽频带局部放电信号时频域特性逐步判别分析Stepwise Discriminant Analysis on Time-Domain and Frequency-Domain Characteristics of Ultra-Wideband Partial Discharge Signals for Oil-Paper Insulation Ageing
梁帅伟;廖瑞金;杨丽君;解兵;
摘要(Abstract):
传统局部放电检测方法测量和分析1MHz以下信号,测量频带窄、信息量少、易受干扰,不能全面反映局部放电本质特征。首先对多个试品进行电热联合老化试验,然后用超宽频带局部放电测试系统,将时域参数和频域参数相结合诊断油纸绝缘老化状态。通过逐步判别分析,先选取13个时频域特征参量中的8个重要特征参量,建立典型判别方程,描出对应的散点图。继而又推导出分别表征油纸绝缘5个老化阶段的Bayes线性判别方程。经原样本组内验证和Jackknife法交叉验证,所建方程组用于诊断油纸绝缘老化状态具有良好的效果。
关键词(KeyWords): 逐步判别法;局部放电;油纸绝缘;超宽频带;变压器
基金项目(Foundation): 国家杰出青年科学基金资助项目(50425722)。~~
作者(Author): 梁帅伟;廖瑞金;杨丽君;解兵;
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