一种微机保护电流传感器的设计及性能分析

Design and Performance of a Novel Current Sensor for Microprocessor-Based Relay Protection

对Rogowski空心线圈进行结构改进,提出一种微机保护用新型电流传感器.详细分析该传感器的基本结构与工作原理,给出其稳态和暂态时输入输出关系.模拟实验结果表明,该传感器对外界干扰磁场和相邻相干扰磁场同样具有很好的抗干扰能力;当(L0,R0)<R<Rf时,测量电流时的误差及相位移均可满足准确级的要求.此外,暂态特性分析表明,输出电压能够准确反映输入的直流分量电流.

A novel electric current sensor（ECS） prototype for microprocessor-based relay protection was proposed in the paper.The prototype makes some improvement on the structure of the rogowski coil.Both the fundamental structure and the principle of the ECS was analyzed in detail,then the static and transient input-output relationship of the ECS was given also.Simulated results verify that,the ECS has the same anti-interference capability for the adjacent magnetic field as to the outside magnetic field,and the error and phase shift can meet the accuracy requirements during the current measuring when（L0,R0）RRf.In addition,the transient characteristic analysis show that the output voltage can accurately reflect the input of the DC component current.