多缺陷绝缘局部放电信号的识别与分类

Feature Extraction of Multi-defect Partial Discharge Patterns

绝缘设备中可能存在多种不同的缺陷,若其同时引发局部放电则给局放信号的检测判断增加了难度。作者介绍了国外用混合weibull函数法和小波分析法识别与分离多缺陷局放信号的技术,他们的实践表明:二者均有较好的识别与分类性能,采用于局放高度分布分析技术的混合,weibull函数法适用于处理两缺陷局放信号,采用多分辨信号分解技术的小波分析法则能更准确地处理多缺陷局放信号。

In practice, there may be various defects in an insulation system, and the partial discharge (PD) signals can be produced by these defects simultaneously. Two methods are introduced to identify and classify the multi-defect PD patterns, i.e. mixed Weibull function applied to PD height distribution (PDHD) analysis and wavelet analysis. It is shown that successful recognition and classification can be achieved by using these two methods.