中文摘要：

提出一种新的局部放电模式——脉冲相位分布（PRPD）模式特征参数提取方法，用于油纸绝缘老化阶段的判定。通过对油纸绝缘内部气隙模型的加速老化试验，以及老化过程中局部放电信号的定期采集，采用主成分因子分析方法，从传统的PRPD图谱统计特征参量中提取出一组新的局部放电主成分因子向量。新的主成分因子不仅彼此之间完全独立，而且各自具备清晰的物理意义，并最大程度地概括了PRPD图谱所包含的信息。基于不同老化阶段的主成分因子向量聚类分析表明，它对油纸绝缘的老化状态判别结果可以为绝缘状态诊断提供具有重要参考价值的信息。

英文摘要：

A new statistical analysis method of phaseresolved partial discharge（PRPD） is proposed for the aging condition assessment of oil-paper. The accelerated aging test of a batch of oil-paper specimens with internal flat air gap is developed and the PD signal is measured periodically. Based on the conventional PRPD pattern, a group of new features are extracted by using the method of Principal Component and Factor Analysis. These features not only are independent with each other but also all have their own physical meaning. They represent the most information of PRPD pattern by limited number of variances. The clustering results of new features extracted at different aging stages suggest that the proposed method provide a powerful approach to identify the oil-paper＇s aging conditions.