Petrochemical Plant acrylonitrile low-voltage lines into the control circuit adopts three-phase low voltage relay,single contact trigger control mode to realize the automatic switching action;time relay to cut off delay.In all when power is lost,there will be calls to tripping delay system,recovery time,influence the quality of power supply.This article is based on the low voltage line control system analysis,elaborated low voltage relay and time relay selection the significance,will enter line cabinet of three-phase low voltage relay replacement for three phase low voltage relay,time relay selection for energizing delay type.Through the improvement of control system,operation personnel system recovery time,improve the power system stability,reliability.%石化厂丙烯腈变低压进线控制回路采用三相低压继电器,单触点触发的控制方式来实现备自投动作;时间继电器为断电延时。在全所失电时,会出现来电跳闸的情况,延误系统恢复时间,影响供电质量。基于对低压进线控制系统的分析,阐述了低电压继电器及时间继电器选取的重要意义,将进线柜内的三相低电压继电器更换为三个单相低电压继电器,时间继电器选为通电延时型。通过对控制系统的改进,缩短操作人员的系统恢复时间,提高了供电系统的稳定、可靠性。
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