Based on the prime radix DFT and number theory, an algorithm using the second order recursive filter and the zero factor prime radix Fourier Transform (ZFT) is presented.

从素基数DFT出发，应用数论理论讨论了一种应用二阶递归滤波结构的算法及零因子转换算法(ZFT)。

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Using a recursive algorithm of DFT, this thesis can locate fault time exactly, thus solved a tickler which had existed many years.

本文采用了DFT递推算法，能准确确定故障时刻，解决了存在多年的难题。

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