化工企业防晃电技术应用  

Application of voltage dips prevention technology in chemical enterprises

作　　者：庞忠 PANG Zhong(Levima Advanced Materials Co.,Ltd,Tengzhou,Shandong 277500)

机构地区：[1]联泓新材料科技股份有限公司,山东滕州277500

出　　处：《电气技术》2023年第3期77-80,92,共5页Electrical Engineering

摘　　要：企业外部电网或内部供电电网故障或异常时,会造成电网短时电压暂降(俗称“晃电”),可能导致化工企业部分电动机跳闸。研究发现,低压电动机防晃电技术从低压接触器的释放电压门槛值入手,选用释放电压较低的防晃电接触器或选用不间断电源、直流电源控制低压接触器,解决低压电动机因晃电而跳闸的问题;高压电动机主要通过投用低电压延时跳闸功能躲过晃电时间,解决高压电动机因晃电而跳闸的问题。110kV、35kV、10kV、6kV电源线路发生故障时,通过本级或上级线路安装的光差保护启动快切装置断开进线断路器、合上母联断路器,使跳闸线路恢复母线供电,解决了6kV以上电源线路因短路造成的母线失电问题。When the external power grid or the internal power supply network fails or is abnormal,it will cause voltage dips,which may lead some electric motors in chemical enterprises to trip.It is found that the voltage dips prevention technology of the low-voltage motor starts from the threshold value of the release voltage of the low-voltage contactor.The voltage dips prevention contactor with low release voltage is selected,or the low-voltage contactor is controlled by uninterruptible power supply(UPS)and DC power supply to solve the problem of low-voltage motor tripping due to voltage dips.The high-voltage motor mainly uses the low voltage delay tripping function to avoid the voltage dip time and solve the problem of high-voltage motor tripping due to voltage dips.When the 110kV,35kV,10kV and 6kV power lines fail,the incoming line circuit breaker is broken and the bus circuit breaker is closed through the light difference protection starting quick cutting device installed in the class or superior line,so as to restore the power supply of the bus for the tripping line,and solve the problem of bus power loss due to short circuit of the power line above 6kV.

关 键 词：短路 防晃电 电动机 快切装置 

分 类 号：TM712[电气工程—电力系统及自动化] TQ083.1[化学工程]