光学电流互感器中微弱信号检测的仿真与分析  

Simulation and analysis of weak signal detection in OCT

作　　者：周浩[1] 李岩松[1] 刘君[1] 赵吴鹏[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《电力系统保护与控制》2009年第22期1-3,8,共4页Power System Protection and Control

基　　金：华北电力大学校内博士学位教师基金

摘　　要：根据光学电流互感器的结构和原理可知,通过缩短传感部分磁光材料的长度可以提高OCT的长期运行稳定性,但在这种情况下,反映电流信息的微弱光电信号将会淹没在强噪声背景中,降低了光学电流互感器的测量精度。针对该问题,提出了采用数字式锁定放大器在该光学电流互感器中进行微弱电流信号的检测,并在Labview平台的基础上进行了仿真,仿真结果证明,本论文所提出的方法极大地提高了OCT的测量精度。According to the structure and principle of Optical Current Transformer, we can improve stability of OCT by shortening the length of magneto-optical materials of sensor parts.But in this situation,slight photo-electric signal reflecting the current information will be submerged in background noise in serious instances,measurement precision of OCT will be reduced.Aiming at this problem, this paper proposes using lock-in amplifier to detect weak signal in this kind of OCT,meanwile simulates the lock-in amplifier detecting weak signal based on the platform of LABVIEW and analyzes the simulation results. The results of simulation indicate that the metering accuracy of OCT can be improved immensely.

关 键 词：光学电流互感器 数字式锁定放大器 信号 LABVIEW 

分 类 号：TM452[电气工程—电器]