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In this paper, we introduced a new type of partial discharge on-line monitoring by ultrasonic visualization system, which is based on ultrasonic diffusing technology. The system uses ultrasonic positioning and image processing method to achieve the partial discharge ultrasonic position visualization. System uses the array type of ultrasonic sensor and a corresponding signal processing device of ultrasonic signal, processes the synchronization acquisition signals of 32 calculation ultrasonic sensor, gets the partial discharge power plane coordinates, establish a mapping relationship between image coordinate data of partial discharge and the actual equipment through image processing technique and finally achieves the visualization of partial discharge intensity and location. The system can intuitively show the discharge location in the image and its status in the development and changes, timely find power equipment's failure and has extensive application value.

Partial discharge (PD) is one of the major causes of insulation degradation/ageing in power equipment, it is significant to detect PD accurately for guarantee equipment's safety and reliable operation. To achieve an accurate PD monitoring and PD location, a new type of PD on-line monitoring system was presented in this paper. The PD phenomena taking place of equipment's surface and/or interface was detected by 32∗32 ultrasonic array sensors, which is capable of collecting and processing multi-sensor synchronized ultrasonic signal came from PD taking place. Based on Acoustic Doppler theory, the measured sound intensity is decided by received the number of entire waves in unit time, which produced by PD. According to the measured sound intensity sequence, a mapping relationship in plane-coordinate between PD event and its location system could be established. Furthermore, 2D image of object is taken by HD camera in this system, the PD location visualization could be achieved by digital image fusion. The system can intuitively show the discharge location in the image and its status in the development and changes, timely find power equipment's failure and has extensive application value.