基于条形铝金属偏振光栅实现的线性光学电压互感器  

Linear Optical Voltage Transformer Based on Strip Aluminum Polarization Grating

作　　者：徐启峰[1] 黄奕钒 谢楠[1] 谭巧 许玉婷 XU Qifeng;HUANG Yifan;XIE Nan;TAN Qiao;XU Yuting(College of Electric Engineering and Automation,Fuzhou University,Fuzhou 350116,Fujian Province,China;College of Computer and Control Engineering,Minjiang University,Fuzhou 350116,Fujian Province,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350116 [2]闽江学院计算机与控制工程学院,福建省福州市350116

出　　处：《中国电机工程学报》2021年第7期2556-2564,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51807030,51977038,62005110)。

摘　　要：现有的光学电压互感器(optical voltage transducers,OVTs)存在3个原理性缺陷:1)测量模式具有光功率依赖性;2)非线性测量;3)晶体固有的半波电压对测量范围与测量灵敏度的限制。这些缺陷损害OVT长期运行的可靠性与准确性。解决上述问题的思路是实现电光相位延迟的直接线性测量。为此,该文提出一种基于条形铝金属偏振光栅实现的线性OVT,将电光相位延迟直接转换为光斑图像的同步平移,采用位置敏感探测器对光斑定位,实现对电压的线性测量。该方法克服了上述3个原理性的缺陷,并改善了温漂,对电光相位延迟的测量范围达到±100°,测量准确度达到0.2级。There are three big defects in the existing optical voltage transducers(OVTs).The first one is that the measurement mode had optical power dependence,the second one is a non-linear measurement,and the third one is that the inherent half-wave voltage of the crystal limits the measurement range and measurement sensitivity.These defects severely impair the reliability and accuracy of OVT’s longterm operation.The idea to solve the above problem is to achieve direct linear measurement of the electro-optic phase delay.To this end,this paper presented a linear OVT based on a strip aluminum polarization grating(SAPG).It was a synchronous translation that directly converts the electro-optical phase delay into a spot image,and used a position-sensitive detector to position the spot to achieve linear measurement of voltage.This method overcomes the above three principle defects,and improves temperature drift.The measurement range of the electro-optical phase delay reached±100 degrees,and the measurement accuracy reached 0.2 level.

关 键 词：光学电压互感器 线性测量 偏振光栅 电光相位延迟 

分 类 号：TM451[电气工程—电器]