To investigate this, I used a filter bank to obtain a set of signals locked to the incoming line frequency.

为了研究这一问题，我使用了一个滤波器组，来获得一系列固定在市电频率的信号。

The operating logics and processes of the automatic transfer of the incoming line breaker and the bus-tie switch are presented.

给出了进线断路器备自投和母联开关备自投的工作逻辑和投切过程。