Abstract：Based on ultrasonic signals generated by partial discharge,the ultrasonic spectrum of the partial discharge is analyzed in this paper. According to the ultrasonic spectrum, the ultrasonic sensor SR40M with center frequency 40kHz is chosen. And considering the high output resistance and the weak output signals of the sensor, an amplifying circuit has been designed in this paper. In order to reduce noise, the active band-pass filter circuit is chosen to filter out the noise. The simulation model of ultrasonic shield is established by using finite element analysis software. The results show that ultrasonic shield can greatly reduce the influence of the interference signal, and improve the anti-interference ability of the sensor.
王庆华. 高压开关柜局部放电超声波传感器的研制及其抗干扰的研究[J]. 电气技术, 2017, 18(8): 21-26.
Wang Qinghua. Development of Ultrasonic Sensor and Anti-interference Research for Partial Discharge in High Voltage Switchgear. Electrical Engineering, 2017, 18(8): 21-26.
2017, Vol. 18 
