电子式电流互感器相位补偿设计

针对目前难以精确测量小电流这一难题,研制了一种适用于小电流测量的电子式电流互感器.根据其特点对各环节所产生的相位差进行分析计算,针对计算结果及以往相位补偿电路的特点与不足,提出基于全通滤波原理、采用2个1阶全通滤波电路串联来解决小范围内相位补偿问题,并给出相位补偿电路的仿真结果及系统试验结果.结果表明该设计方案具有良好的相位补偿效果,并且能够使该系统的精度达到国标0.2级标准.

Phase Compensation Design of Electronic Current Transducer

According to the difficulty of measuring low amplitude current accurately,an electronic current transducer applied to low amplitude current measurement is studied.On the base of system's characteristic,the phase error caused by system is analyzed and calculated,then according to the result and the characteristics and shortage of anciently phase compensation circuits,a new phase compensation circuit is designed,which based on all pass filter circuit,namely adopted two series one rank all pass filter circuits to compensate small phase error,and the imitation and examination result is given.The result indicates that this compensation project has well phase compensation effect,and also can make the system meet 0.2 level of international criterion.