由于电磁式电流互感器存在突然失效(如突发性爆炸)的危险及在短路故障状态下,铁心饱和,易引起继电保护误动作等一系列缺点。科学技术发达国家都在寻求把光学传感技术列用于超高压大电流的电力网络中。 所谓光学电流传感器(Optical Current Transducer),典型地是利用法拉弟效应的方法实现的,法拉弟磁光效应是指:一束线偏振光在磁场作用下通过磁光材料时,它的偏振面将发生旋转,旋转角θ正于磁场沿着偏振光通过材料路径的线积分,即 Due to the sudden failure of the electromagnetic current transformer (such as sudden explosion) and the short-circuit fault condition, the core saturation, easy to cause relay protection malfunction and a series of shortcomings. Science and technology developed countries are seeking to use optical sensing technology for high voltage and high current power network. The so-called optical current sensor (Optical Current Transducer), typically using Faraday effect method to achieve, Faraday magneto-optical effect refers to: a beam of linearly polarized light in the magnetic field through the magneto-optical material, its polarization will be Rotation occurs where the angle of rotation θ is integral with the line along the path of the polarized light through the material, ie