直线型线圈电流传感器的研究

为了测量三相汇流排导体中的电流，该文提出一种采用直线型罗柯夫斯基(Rogowski)线圈作为电流传感单元的间接测量方法。根据电磁感应定律和毕奥-萨伐尔定律，运用数值积分算法，求解出汇流排导体矢量磁位，并推导了测量单相和三相汇流排导体电流时直线型线圈的输出表达式。对研制出的直线型线圈进行了实际测试和理论计算，得出了在存在垂直偏移误差、水平偏移误差以及转动误差等情况下，线圈的相对误差曲线，理论计算与实际测量基本吻合。基于该原理的电流传感器经过2年多的现场实际运行，验证了其实用性。

Study on Current Transducer Based on Planer Coil

For measuring current in three-phase plate-form busbars, this paper proposed an indirect method that used planar Rogowski coil as the current sensing part. Based on the electromagnetic induction law, Biot-Savart law and the numerical integration arithmetic, the vector potential of the busbar was calculated and the electromotive force of the planar coil for the single phase and three-phase busbar current was deduced. The relative error that was caused by vertical displacement, flat displacement and rotated displacement of coil was measured and calculated when the coil was used for the measurement of plate-form busbar current. The results of the theoretical calculation about the coil have good accordance with the experiments. More than two years of field testing shows that the current transducers based on the planar Rogowski coil proposed by this paper meets the requirement of practicality.