一种中频双级电子式电流互感器误差特性的研究

研究了一种基于低功率铁心线圈的中频双级电子式电流互感器.通过对中频双级电子式电流互感器等效电路的分析,得到了电流误差和相位误差的表达式.为验证双级电子式电流互感器的中频传感性能,构建了基于差值法的中频双级电子式电流互感器校验系统,该系统采用32位DSP浮点芯片TMS320F28335进行数据采集控制和运算处理.实验结果表明,该双级电子式电流互感器在50～1 000Hz频率范围内的误差准确度可达0.05级.

Research on the error characteristics of an intermediate frequency two-stage electronic current transformer

An LPCT-based intermediate frequency two-stage electronic current transformer was studied.The expressions of ratio errors and phase errors were obtained by analyzing the equivalent circuit of the intermediate frequency two-stage electronic current transformer.For verifying the intermediate frequency sensing characteristics,a difference measurement method-based test set for the LPCT-based intermediate frequency two-stage electronic current transformer was constructed.The test set made use of a 32-bit float DSP TMS320F28335 to realize the control of data acquisition and error calculation.The experimental results show that the accuracy of the intermediate frequency two-stage electronic current transformer can reach 0.05% in the frequency range from 50 Hz to 1,000 Hz.