石乐贤,李燕青,王洋,葛嫚,晋宏飞.基于ICA的变压器局部放电超声信号直达波分离研究[J].电测与仪表,2012,49(3):11-14. SHI Le-xian , LI Yan-qing , WANG Yang , GE Man , JIN Hong-fei.Research on Direct Wave Separation of PD Ultrasonic Signal Based on ICA[J].Electrical Measurement & Instrumentation,2012,49(3):11-14.
基于ICA的变压器局部放电超声信号直达波分离研究
Research on Direct Wave Separation of PD Ultrasonic Signal Based on ICA
For Positioning accuracy problems existed in the partial discharge(PD) of transformer ultrasonic detection method,the main reason mostly due to the time delay selected error is analyzed,while the main reason for time delay selected error is due to the transformer PD ultrasonic signal propagation which is extremely complex,and the signals received by the ultrasonic sensor are the direct wave,non-direct wave and a mixture of all kinds of noise superimposed.So in order to improve positioning accuracy the correct separation of the direct wave’s time delay is important.This paper proposes a method of transformer PD direct wave ultrasonic signal separation based on independent component analysis(ICA),by a separate analysis of the direct wave signal,non-direct wave signal and noise characteristics of each principal component,with the use of ICA to separate from the mixed signal,extract the direct wave signal and select the time delay.Simulation and experimental results demonstrate the feasibility of the method.
