Method for ultrasonically positioning multiple discharging sources in large transformer

The invention discloses a new method for simultaneously positioning multiple discharging sources in a transformer by using a spatial spectrum estimation theory in array signal processing technology. According to the method, two ultrasonic sensor arrays are installed on the inner wall of the transformer and are used for receiving an ultrasonic signal radiated from a target space. By means of the spatial spectrum estimation theory in array signal processing technology, the characteristic information, such as the number of signal sources, the direction of propagation or the like, of the ultrasonic signal received by the ultrasonic sensor arrays is analyzed, the number of discharging sources and the direction of the discharging sources are estimated, and discharging distance is computed in order that multiple targets with partial discharge are positioned. A simulated result manifests that the method has good resolution and estimation precision and may effectively estimate the spatial positions of multiple discharging sources in the transformer.