新型PCB空心线圈电流互感器的设计与研究

为了进一步提高传统空心线圈的互感系数及其稳定性,以获得高精度的测量结果,提出一种新型PCB板空心线圈电流互感器。它具有全新的物理结构,通过其自身采取的抗干扰措施能够有效的抵抗外界的电磁干扰;并且,经过简单的组合即能有效地提高其互感系数。分析了新型PCB板空心线圈电流互感器的传感原理及抗干扰机理,给出了在不同电流级别下PCB空心线圈的结构以及一次导线的摆放特点,并针对其中一种设计结构制作了实际模型,进行了线性度与抗干扰能力测试,结果表明:额定电流为100A时,其测量准确度达到了0.2级,且具有较强的抵抗外界电磁场干扰的能力。

Design and Research on New PCB Air-Core Coil Current Transducer

To further improve mutual inductance and stability of conventional air-core coil,a new PCB air-core coil current transducer was proposed,to achieve high fidelity measurement.The new PCB air-core coil current transducer with completely new physical structure can efficiently repel outside electromagnetic interference by its special anti-interference ability,and can significantly improve transducer's mutual inductance by simple combination of PCBs.The basic inductive principle and anti-electromagnetic interference mechanism of the new transducer were analyzed;the PCB structure designs for different current levels and the location of primary coil were presented.A prototype of one design was made,and its linearity and anti-interference ability were tested.The experiment indicates that the accuracy of the PCB air-core coil current transducer can reach 0.2 class under the rated current of 100A with enhanced anti-electromagnetic interference ability.