低功耗铁芯线圈型电子式电流互感器的非线性补偿技术研究

Research on Nonlinear Compensation Technology for Low Power Iron-core Coil Electronic Current Transformers

低功耗铁芯型电子式电流互感器通常连接测量用仪器仪表,但是作为一次传感器的低功耗铁芯线圈具有非线性的特点,磁化电流是它的主要误差源。因此提出了一种非线性补偿技术,该技术基于低成本线性电路和非线性数字控制律,能输出准确度高的电压模拟量,理论分析及实验验证了该技术方案的可行性。

The low power iron-core coil electronic current transformers are often connected with measuring instruments and meters. However, low power iron-core coils have nonlinear characteristics as primary current sensors and the main error source is the magnetizing current. Therefore, a nonlinear compensation approach is proposed. It can output high-accuracy voltage analog quantity based on a low-cost linear circuit and a nonlinear numeric control law. And the feasibility of the technical scheme is verified by theoretical analysis and experiments.