System for accurately controlling voltage through digital display voltage meter

The invention provides a system for accurately controlling voltage through a digital display voltage meter. The system comprises the three-phase digital display voltage meter, a set of load contacts and a set of air switches. The voltage meter is provided with a normally opened alarm output point and a normally closed alarm output point, and an upper limit voltage and a lower limit voltage are set on the voltage meter. The system is characterized by further comprising a load contact or an air switch release. A load is controlled to stop working through the upper limit alarm normally closed point and the upper limit alarm normally opened point of the three-phase digital display voltage meter and the movement of the load contacts or the air switch release. The system which can accurately control the magnitude of the voltage on a circuit is utilized to control the voltage required by the load and guarantee electrical normal operation. The system for accurately controlling the voltage has the ...