为了解决电解领域大电流测量难度大的问题, 在传统光纤电流互感器(FOCT)的基础上提出一种新型的便携式光纤电流互感器(P-FOCT)。由于在P-FOCT的设计和安装过程中, 柔性传感头光路不闭合和导体偏心会引起法拉第相移误差, 进而影响电流计精度, 因此对传感头闭合误差和导体偏心位置对P-FOCT的影响进行了理论分析和实验测试。结果显示, 法拉第相移相对误差随传感头不闭合角度线性增加,随导体到非闭合长度中心的距离增大而减小。另外, 增加传感头匝数能减小P-FOCT的法拉第相移误差, 提高其测量精度。

To deal with the problem of high current measurement in electrolytic aluminum industry, a portable fiber-optic current transformer (P-FOCT) is proposed on the basis of the traditional optical fiber current transformer (FOCT). Due to that the galvanometer accuracy is affected by the Faraday phase shift errors which are caused by the flexible sensing coil non-closed optical path and conductor eccentric position in the process of P-FOCT design and installation, the influence of sensing coil errors and conductor eccentric positions on P-FOCT are theoretically analyzed and experimentally tested. The results show that the Faraday phase shift relative error increases with the non-closed angle of sensing coil and decreases with the increase of the distance between conductor and the center of the non-closed length. Moreover, the Faraday phase shift relative error can be decreased by increasing the number of sensor head turns, and its accuracy can be improved.