磁光式电流互感器模型与测量性能分析

Analysis on the model and measuring performance of MOCT

对应用于智能变电站电能质量电流数据测量的磁光式电流互感器进行研究。实际情况下,工作波长波动、起偏器与检偏器透光轴交角误差对磁光式电流互感器测量造成影响,详细地论述了磁光式电流互感器数学模型构建的过程,建立了磁光式电流互感器传感头的琼斯矩阵,基于改进型双光路检测法建立了实际情况和理想条件下的磁光式电流互感器的整体模型。基于理想条件和实际情况,讨论了互感器对谐波电流扰动信号的测量性能。

The MOCT（magneto-optical current transformer） is analyzed, which is used in smart substation for power quality current data measurements. It is found that the output signals of the MOCTs are influenced by both the fluctua- tion of operating wavelength and the intersecting angle error of optical axes of polarizer and analyzer. The building process of a mathematical model of magneto-optical current transformer is discussed in detail. Firstly, magneto-optical current transfdrmer sensor head Jones matrix is established, then, an overall model is established under ideal condi- tions and the actual conditions based on an improved dual optical paths detection method. At last, the measurement performance of harmonic current transformer signal disturbance is discussed based on the ideal conditions and the actu- al situation.