局部放电超声信号监测及数字降噪

Partial Discharge Ultrasonic Signal Monitoring and Digital Noise Reduction

设计了基于超声法的局部放电监测系统,并对信号进行了数字降噪研究。系统的硬件设计主要包括超声传感器、放大电路、滤波电路和数字电路,其中放大电路设计为两级四档可调放大电路,滤波电路采用四阶高通滤波器和二阶低通滤波器级联而成。对采集的信号综合运用FIR滤波器、FFT降噪、小波包降噪等数字降噪方法进行降噪。实验和仿真表明,系统可以清晰地采集局放信号,数字降噪算法可以有效地抑制干扰。

This paper designs a partial discharge monitoring system based on ultrasonic method,and researches on digital noise reduction.Its hardwire consists of ultrasonic sensor,amplifier circuit,filter circuit and digital circuit.The amplifier is designed as four stage adjustable amplifier circuit,and the filter is made of the four order high-pass filter and the two order low-pass filter.FIR filter,FFT and wavelet packet are used for the digital noise reduction.Experiment and simulation results show that the system can be used to collect the signal clearly and the digital noise reduction algorithm can be used to control the noise effectively.