施于延迟环的振动导致FOCT误差的研究  

Investigation of FOCT measurement error induced by vibration on delay line ring

作　　者：刘勇 刘彬 黄俊昌 黄咏喜 胡坤芳 卢树峰 柳嘉 吴重庆 LIU Yong;LIU Bin;HUANG Junchang;HUANG Yongxi;HU Kunfang;LU Shufeng;LIU Jia;WU Chongqing(China Electric Power Research Institute Wuhan branch,Wuhan 430074,China;Huazhong University of Science and Technology,Wuhan 430074,China;State Grid Jiangsu Electric Power Co.Ltd.,Nanjing 210000,China;Nanjing Henggao photoelectric Research Institute Co.,LTD,Nanjing 210046,China;Beijing Jiaotong University Tangshan Research Institute,Tangshan Hebei 063004,China)

机构地区：[1]中国电力科学研究院有限公司,武汉430074 [2]华中科技大学,武汉430074 [3]国网江苏省电力有限公司,南京210000 [4]南京恒高光电研究院有限公司,南京210046 [5]北京交通大学唐山研究院,河北唐山063004

出　　处：《激光杂志》2024年第12期200-207,共8页Laser Journal

基　　金：国家电网公司科技项目资助(No.5500-202155473A-0-5-ZN)。

摘　　要：全光纤电流互感器(fiber-opticcurrent transformer,FOCT)是特高压直流输电系统中重要的一次设备,基于压电陶瓷调制的FOCT是一种广泛使用的调制方式。它的耐振动性能是其耐候性的重要指标,其中的保偏光纤延迟环对振动最敏感,是造成振动导致的FOCT的主要误差源之一。从力学特性和光学特性两方面分析了振动对FOCT误差的影响,指出外界振动的作用,会产生一个附加的调制叠加在PZT调制上,从而改变输出信号的谐波比,形成误差。理论分析和实验结果均表明,光纤延迟环的机械谐振特性对于误差有明显的影响,得到了多谐振点时的谐振曲线和计算公式,给出了不同频率、不同加速度以及不同被测电流时的误差,理论分析与实验基本一致。Fiber-optic current transformer(FOCT)is an important primary equipment in UHVDC transmission system.FOCT based on PZT modulation is a widely used modulation mode,in which the polarization-maintaining fiber delay ring is the most sensitive to vibration,that is one of the main errors of FOCT under vibration.In this paper,the influence of vibration on FOCT error is analyzed on mechanical and optical characteristics.It is pointed out that the external vibration will produce an additional modulation superimposed on PZT modulation,which will change the harmonic ratio of the output signal and introducing an error.Both theoretical analysis and experimental results show that the mechanical resonance characteristics of the fiber delay ring have a significant influence on the error.The resonance curve and calculation formula for multiple resonant points are obtained,and the error for different frequencies,different accelerations and different measured currents are given.The theoretical analysis is basically consistent with the experiment.

关 键 词：光纤电流互感器(FOCT) 振动误差 光纤延迟环 

分 类 号：TN248[电子电信—物理电子学]