光纤大电流传感器研究

Study on Fiber-optic Big Current Sensor

以法拉第磁光效应为原理的光纤电流传感器因其无爆炸,抗电磁干扰,绝缘性好,价格便宜等优点,将成为传统电流互感器的替代品。在此设计一种光纤大电流传感器,介绍该器件的工作原理、传感头的结构、光路的设计、调整、两偏振片夹角的选取。搭建实验系统并进行测试,实验结果表明,光纤电流传感器在3 kV工作电压下可准确实现32 kA连续或脉冲电流的测量,并有0-32 kA的动态范围,而且重复性和线性度良好,响应时间小于10μs。

The fiber- optic current sensor that is based on the principle of Faraday effect has many good characters, such as high resistance of EMI, strong insulation,low price, simple configuration, little weight, convenience for fix and so on, so it is becoming the substitute of the traditional CT. A kind of fiber - optic sensor of big current is designed. It＇s principle, adjustment, design of optical path and selecting two polarimeter＇s angle are described particularly. The experimental system of sensor is constructed. The experimental result is analyzed. It indicates that sensor can measure the pulse or continuous current of 32 kA with the voltage 3 kV accurately, and it has a dynamic range 0-32 kA current. It has good stability and linearity, response time is less than 10μs.