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  

Development of Ultrasonic Sensor and Anti-interference Research for Partial Discharge in High Voltage Switchgear

作　　者：王庆华 

机构地区：[1]国网福建省电力有限公司,福州350003

出　　处：《电气技术》2017年第8期21-26,共6页Electrical Engineering

摘　　要：本文以局部放电产生的超声波信号为依据,通过对局部放电产生的超声波进行频谱分析,得知低频段所包含的分量较为丰富,因此选取了中心频率为40kHz的SR40M型压电转换装置作为该局部放电测量系统的超声传感器。基于该传感器输出阻抗大、输出信号非常微弱的特点,设计了放大电路;同时为了降低噪声,设计了相应的有源带通滤波电路,信号经过放大滤波后得到了比较满意的结果。利用有限元分析软件建立了超声波屏蔽罩的仿真模型。仿真结果表明,超声波屏蔽罩能降低外界干扰信号对测量的影响,提高了传感器的抗干扰能力。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.

关 键 词：高压开关柜 超声波传感器 抗干扰 有源滤波器 超声屏蔽罩 

分 类 号：TM855[电气工程—高电压与绝缘技术]