适用于配电网故障指示器的PCB型罗氏线圈电流互感器设计

针对传统的故障指示器使用铁芯式电流互感器体积较大、高频特性不佳,不能满足配网故障电流检测需要的问题,基于罗氏线圈的工作原理,设计了多片组合式PCB型罗氏线圈及后端积分放大电路,建立了PCB型罗氏线圈电流互感器传递函数模型并通过Matlab进行仿真,制作了PCB型罗氏线圈电流互感器实物并进行试验测试其性能。结果表明,PCB型罗氏线圈电流互感器不仅可准确反映工频电流大小,同时还具备良好的高频特性,能够满足配电网故障定位的测量需求。

Design of PCB Rogowski Coil Current Transformer for Fault Indicators in Distribution Networks

Due to the drawbacks of large volume and inferior performance on high frequency, the core-type current transformer applied in traditional fault indicator can not meet the needs of fault current detection in the distribution network. To solve this problem, a multichip knockdown PCB Rogowski coil as well as its back-end integration amplifier circuit is designed based on the operating principle of Rogowski coil. The transfer function model of the PCB Rogowski coil current transformer is built and simulated via Matlab. The results show that the current transformer can not only reflect the amplitude of power-frequency current accurately, but also has an excellent high-frequency characteristics. Therefore, it can satisfy the measure demand of distribution network fault location.