一种新型光纤电流互感器

A new type optical fiber current transformer

提出了一种新的反射式偏振干涉电流互感器,建立了系统的结构模型,阐述了互感器的工作原理,给出了λ/4延迟器产生圆偏振光的方法和传感头的设计方案,最后给出了实验数据。其中经过λ/4延迟器的二束光除偏振方向互相交换外,它们都在同一根光纤中传输,周围环境产生的光纤伸缩等效应对互感器的输出几乎没有影响,因此可以排除外来的干扰。实验表明,全光纤电流互感器的误差基本满足0.2级精度,并且具有自动补偿功能,较好地消除了温度等环境影响,提高了互感器的信噪比。

A new reflect-polarization interferometric electronic current transformer was developed and tested. The system＇s structure model was established. The work theory was expatiated. A method to produce circular polarization light was proposed. The design method of transducer probe was presented. Tbereinto, by k/4 delayer, two bind lights not only exchange polarize aspect but also they transfers in a same fiber, the flex domino effect has not infection to transformer, so the extra disturbance around entironment bringing was dehared. The initial experiment research was carried out and the experiment data was gained. Testing results show that the new transformer＇s accurate degree is 0.2 levels. The new type optical fiber current transformer has automatism compensate function, preferably eliminates temperature＇s infection and increased signal-to-noise.