利用数字式全光纤电流检测系统抗干扰能力强、完全电气隔离等优点, 在光纤电流传感器原理的基础上, 研究了一种小巧的、适用于高压端大电流检测的基于法拉第磁光效应偏振态调制的数字式全光纤电流检测系统, 改进了目前电力系统中使用的传统电磁式电流互感器。该研究应用保偏光纤有效抑制光纤中固有的线性双折射, 使用琼斯矩阵对光纤系统进行分析, 利用MATLAB仿真软件进行系统仿真, 通过理论分析和系统仿真验证了由数字式全光纤电流互感器测得的电流值与电流的实际大小一致, 所建立的系统数学模型和仿真模型正确可行。

A small suitable digital all-optical current measurement system is studied which is presented under the principle of the optic-fiber current sensors, is used by the advantage of the strong anti-interference ability and the complete electrical isolation, aimed to solve the actual technical problems of the existing power system high voltage side current detection system, such as the strong electromagnetic interference, the complicated insulation system and the high cost of the maintenance and so on. This paper will improve the traditional electromagnetic current transformer in the power system. It used polarization maintaining fiber to inhibit the inherent linear birefringence in the fiber effectively, used Jones matrix to analysis of the fiber-optic system and used MATLAB simulation software to simulate the system. The theoretical analysis and system simulation have verified that the digital all-fiber current transformer measured current and the actual current is consistent. Shows that the system established mathematical model and simulation model is correct and feasible.