Simultaneous Detection of Ultrasonic and Vibration Combined Signals for Transformers

Power transformer is a complex system in which the interaction between mechanical and electrical effect jointly affects the performance of the transformer. The mechanical vibrations during normal operation damage the oil-paper insulation, causing defects in the insulation and promoting the development of insulation deterioration. Based on ultrasonic vibration combined sensor, this paper sets a typical insulation defect model in the field to the transformer, and synchronously detects the vibration and ultrasonic signals, and obtains the time domain and frequency domain diagrams of the vibration and ultrasonic signals, so as to realize the synchronous analysis of the vibration and ultrasonic signals in the partial discharge of the transformer.