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电网技术  2007 

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

, PP. 38-43

Keywords: 逐步判别法,局部放电,油纸绝缘,超宽频带,变压器

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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。

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