Rogowski线圈电子式电流互感器积分技术研究

积分环节是影响Rogowski线圈电子式电流互感器精度的关键因素.论述了模拟积分器的设计与实现,分析了模拟积分器的频率特性,理论分析和试验结果表明低频信号和温度对其精度有较大的影响.为进一步优化积分环节,设计了基于ARM的数字积分器,分别论述了其硬件结构和梯形积分算法,并且仿真了梯形积分算法对稳态电流和暂态电流的响应.仿真和试验结果表明,梯形积分算法能够很好的还原一次电流,同模拟积分器相比,数字积分器具有更高的精度和稳定性.

Study on Integration Technology of Rogowski Coil Based Electronic Current Transformer

Integration element is the key factor that influence the accuracy of Rogowski coil based electronic current transformer. The design and realization of analog integrator is discussed, frequency characteristics of the analog integrator is analyzed. Based on the theory analysis and test results it is found that the low frequency signal and temperature have magnificent influence on the accuracy of analog integrator. The digital integrator based on ARM is designed to optimize the integrator element furthermore. The hardware structure and trapezoidal integral algorithm are discussed, and responses of the trapezoidal integral algorithm to steady and transient currents are simulated. Simulation and test results show that the trapezoidal integral algorithm can restore the primary current perfectly and has higher accuracy and stability comparing with analog integrator.