求翻译：低频减负荷是当电力系统有功功率严重不足导致系统频率急剧下降时，保持系统稳定运行的一种自动控制装置。备用电源自投装置是保证配电系统连续可靠供电，具有串行通信功能的安全自动装置。是什么意思？

When low-frequency load shedding is a serious shortage of power system led to a sharp decline in the active power system frequency , an automatic control system to keep the system stable operation .

Low-frequency the load is the power system active power low causes the system frequency declined sharply, to keep the system running in a control unit. standby power from the unit is to ensure that power distribution system is in continuous reliable supply of electricity, with a serial communication

Low frequency reduces the load is when the electrical power system active power serious causes insufficient the system frequency drops suddenly, maintenance system stable movement one kind of automatic control device.The emergency power supply turns oneself in the installment is guaranteed the elect

Under frequency load shedding is when the serious shortage of power system in power system frequency declined drastically, keeping the system stable operation of an automatic control device. Standby power source automatic put in device is to ensure continuous reliable power supply distribution syste

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