电网电压的监测电路

Monitorning Circuit of Voltage in Grid

本文分析了一种电网电压的监测电路的工作原理。该电路可对电网中的三相电压进行监测，且上、下限整定值可以单独调节，适用于各种用电设备的过压或欠压保护，线路简单可靠，制作容易，使用方便。

The paper makes principle analysis of monitoring Circuit of Voltage in Grid. The circuit can moitor three voltage in grid, and up and down limit alone adjusted. It can protect different kinds of electric equipments from overvoltage or lower voltage limit. The circuit is simple and reliable. It is small in size and conveniant in use.