A new detection method using ultrasonic sensor to detect generator stator windings partial discharge（PD） is proposed

aimed at the problem of traditional off-line test methods can not fully reflect the real generator operating status.According to analysis on the PD ultrasonic signals

the generator PD ultrasonic detection system was designed.The spread characteristics of PD ultrasonic signal from PD model in the generator and PD ultrasonic signal in generator were detected by using the system.The detection results of the different position of discharge sources in generator were analyzed and compared.Experimental results show that the proposed detection system is feasible and it has advantage of high sensitivity and stability.