采用牛顿环光栅的光学电压互感器相位延迟检测方法  

Phase Delay Detection Method for Optical Voltage Transformer Based on Newton Ring Grating

作　　者：谢楠[1] 徐启峰[1] 谭巧 XIE Nan;XU Qifeng;TAN Qiao(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China;College of Computer and Control Engineering,Minjiang University,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院,福建省福州市350108 [2]闽江学院计算机与控制工程学院,福建省福州市350108

出　　处：《电力系统自动化》2020年第8期185-191,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51807030)。

摘　　要：基于非线性解调模式的光学电压互感器存在测量结果与光功率相关、电压测量范围受半波电压限制等问题。文中提出一种基于牛顿环亚波长光栅实现的线性光学电压互感器。与径向检偏光栅相比,牛顿环光栅的消光比沿径向均匀分布,可将电光相位延迟转换为光斑图像的同步旋转。四象限探测器用于对光斑图像进行定位,实现电压信号的实时线性测量。实验结果表明:该光学电压互感器的测量结果与光功率无关,对电光相位延迟的测量范围可以达到±80°,在实验室条件下准确级为0.2级。The measurement results of the optical voltage transducer based on the nonlinear demodulation mode are related to the optical power,and the half-wave voltage limits its voltage measurement range.To solve the above problems,this paper proposes a linear optical voltage transformer based on Newton ring sub-wavelength grating.Compared with the radial analyzer grating,the extinction ratio of the Newton ring grating is evenly distributed in the radial direction.It converts the electro-optic phase delay into the synchronous rotation of the spot image.The four-quadrant detector is used to locate the spot image for real-time linear measurement of the voltage signal.The experimental results show that the measurement result of the optical voltage transformer is independent on the optical power,and the measurement range of the electro-optic phase delay can reach±80°,and the accuracy level is 0.2 in laboratory conditions.

关 键 词：光学电压互感器 泡克尔斯效应 牛顿环光栅 线性测量 

分 类 号：TM451[电气工程—电器]