The problems existing in manual synchronizationcircuit and back speedup function of CSL?100 series protective relays at line to line serial connection mode are analyzed.
The proposed method doesn't need hardware synchronizationcircuit and can perform the calculation of fundamental positive sequence component of the supply voltage in real time.
这种方法不需要硬件同步电路，能实时地计算电源电压中的基波正序分量。
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This paper presents a high speed PCM demodulation circuit through which the serial parallel converter plays a role of demodulating and the hardware realizes frame synchronization.