摘要
振动敏感性和温度漂移是基于法拉第效应的光纤电流互感器的两大缺点,限制了其在恶劣环境下的工程应用。为此设计并验证了一种消除振动敏感性与温度漂移的新型光纤电流互感器。采用双线绕法绕制光纤线圈;在线圈的传感光纤中点处耦合一个半波片;将位于传感线圈输入端口的一个1/4波片的耦合角度旋转90°。使用琼斯矩阵方法分析了新互感器对振动敏感性和温度漂移的消除。使用低频振动实验台和高低温箱的实验结果表明,新型的光纤电流互感器能够在外界振动频率10～400Hz、振动加速度0～20g(g为重力加速度)的环境下稳定测量100～1000A的电流,系统线性度良好,相对偏差不超过±0.2%;在-50°C～50°C温度范围内基本消除了温度漂移。该互感器结构简单、精度高、抗干扰能力强,为光纤电流互感器的设计提供了新思路。
The insensitivity to vibration and the temperature drift are two defects of the fiber-optic current transducer based on the Faraday effect,which restrict its harsh environment engineering applications. Therefore,a new scheme of fiber-optic current transducer insensible to vibration and temperature is designed and verified. Its sensing fiber coil is fabricated by the bifilar winding technique,which consists of one half-wave plate embedded in the middle of the sensing optical fiber and one quarter-wave plate rotated by 90 degrees in its input port. Theoretical analysis with Jones matrix shows that the new transducer is insensitive to vibration and temperature. Experimental results using low-frequency vibration test table and low/high temperature chamber suggest that,this new transducer can steadily measure the current from 100 to 1000 A under strong mechanical vibration at accelerations up to 20 g and frequencies from 10 to 400 Hz,with good linearity and a relative deviation of no higher than ± 0.2%. Furthermore,its temperature drift is eliminated in the temperature range of -50°C^50°C. This configuration,with simple structure,high accuracy and immunity to circumstance,is a new technique for fiber-optic current transducers design.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第4期980-986,共7页
High Voltage Engineering
基金
国家自然科学基金(60537060)~~
