And the power switches are used to control the direction of power flow.
电能开关是控制能流方向的元件。
Reverse power relay a reverse power relay is a relay with a wattmeter movement that senses the direction of power flow.
逆功率继电器逆功率继电器是指带瓦特计的继电器，用来感知电流的方向。
The power switches is able to control the direction of power flow as long as the capacitor voltage is kept higher than the system voltage.
只要电容电压比系统电压高，则电能开关就能控制能流方向。
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