一种电子式电流互感器的研制

针对传统电流互感器绝缘复杂、易饱和等缺点，研制了一套电子式电流互感器。利用Rogowski线圈作为传感头，经过A/D转换、电光转换，由光纤将一次电流信息传输到低电位端进行信号处理。数据采集采用多路数据采集系统，可以将Rogowski线圈测量通道信号、保护通道信号、传感头温度值以及供电系统电压值进行分时传输。整套装置测量准确度达到0.5%，并具有绝缘简单、动态范围广以及不会产生磁饱和等优点。

DEVELOPMENT OF AN ELECTRONIC CURRENT TRANSFORMER

An electronic current transformer is developed to overcome the disadvantage of traditional current transformer such as complexity of insulation, saturation of coils and so on. With a Rogowski coil as sensor, the information of primary side current can be transferred to secondary side for signal processing by analog digital conversion and electric optic conversion. Derivative signals of current for measurement and relay produced with Rogowski coils, temperature signal and the value of supply voltage at primary side can be transferred with time division multiplexing data acquisition system (TDMDAS). The accuracy of electronic current transformer is better than class 0.5. And it is very easy to insulate and has wide dynamic range and no magnetic saturation.