真空斷路器遙測裝置中最重要的測量參數中最重要的是三相交流電參數，當電網頻率
波動時，必須采用交流同步采樣技術才能保證采樣計算精度，同步檢測和FFT 算法成為其核心技術，文章提出了如何使用硬件同步和軟件同步相結合，以提高三相同步交流采樣的精度和可靠性。
關鍵詞：電力系統交流同步采樣 FFT ARM LPC2138
Abstract: Three phase alternating current(AC) parameters are the main data which
will be inspected by vacuum breaker inspect equipments, AC synchronization sampling
technology must be adopted to ensure the sampling counting precision in inspect
equipments because of the undulation of electrical nets frequency. Synchronization
inspect and FFT algorithm are advanced in this paper to improve the precision and
dependability of three phase synchronization AC sampling through the connection of
software synchronization and hardware synchronization, the validity of this method
is proved in practice application.
Keywords: electric power system, vacuum breaker, AC synchronization sampling, FFT