油纸绝缘气隙放电特征信息提取及其过程划分

Feature Information Extraction of Air-Gap Discharge in Oil-Paper Insulation and Its Process Partition

油纸绝缘是油浸式电气设备的常用的绝缘方法,其一旦发生局部放电会引起绝缘的老化和破坏,及时了解局部放电的产生与发展特性能判断运行设备的潜伏性故障及其发展。论文对油纸绝缘气隙放电进行了研究,采用核主成分分析的方法对其统计特征算子进行了降维处理,提取了新的特征因子。采集局部放电发展过程中不同时刻的信号样本,对新的特征因子进行了聚类分析,聚类结果结合局部放电发展的不同时刻的信息将局部放电发展过程分为初始放电阶段、放电发展阶段、放电稳定阶段和预击穿阶段。

Oil-paper insulation system is the most common insulation method of oil-immersed high voltage electrical equipment.And the event of partial discharge can lead to aging and disruption of the insulation,so understanding the emergence and development of partial discharge in time can find internal latent fault and judge its development of electrical equipments.The paper does research on the air-gap discharge in the oil-paper insulation,and use kernel principal component analysis method to reduce the dimension of statistical attribute parameters and extract the new characteristic parameters.The sample signals at different times during the development process of discharge are adopted to cluster the new characteristic parameters.According to the information generated at different periods of the process combined with the clustering results,the partial discharge development process can be divided into initial discharge stage,discharge development stage,discharge stabilization stage and pre-breakdown stage.