小电流接地选线中交流信号的采集与处理

Collection and processing AC signals on small currents grounded fault system

由于系统需要采集多达40路的零序电压电流信号,在计算零序电压和零序电流相位差时产生很大的硬件误差,提出了用软件相位补偿方法来消除硬件误差。在信号处理上采用12点采样的差分傅立叶算法,最后利用泰勒级数计算特殊角的三角函数值,很好地解决了交流信号采集与处理问题。

Because the system is to collect as many as 40 roads zero sequence voltage and zero sequence current signals,so there will he caused greatly hardware delay in calculation zero sequence voltage and zero sequence currents. A software phase compensation methods to eliminate hardware delay was presented. In signal processing, the differential Fourier of 12 samples algorithm was used, the final stages of the special use Taylor to calculate the trigonometrical values. A very good exchange of signals collection and processing solution.