星-三角降压启动控制线路演示幻灯片

1,三相异步电动机的降压启动控制线路,全压启动：启动时加在电动机定子绕组上的电压为电动机的额定电压。降压启动：利用启动设备将电压适当降低后，加到电动机的定子绕组上进行启动，待电动机启动运转后，再使其电压恢复到额定电压正常运转。电动机的直接启动条件：,2,电动机启动时，把电动机的定子绕组接成星形，电动机定子绕组电压低于电源电压起动，启动即将完毕时再恢复成三角形，电动机便在额定电压下正常运行。,Y降压启动控制线路,3,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,电路组成分析,KMY,KT,M3,KH,KH,时间继电器自动控制Y降压启动控制线路,4,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,合上电源开关QS,KMY,KT,M3,KH,KH,2.时间继电器自动控制Y降压启动控制线路,5,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,降压启动:按下SB1KT线圈得电KMY线圈得电,KMY,KT,M3,KH,KH,2.时间继电器自动控制Y降压启动控制线路,6,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,KMY主触头闭合KMY动合辅助触头闭合KMY动断辅助触头断开KM自锁触头闭合KM主触头闭合电动机降压启动,KMY,KT,M3,KH,KH,2.时间继电器自动控制Y降压启动控制线路,7,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,松开SB1电动机继续降压启动,KMY,KT,M3,KH,KH,2.时间继电器自动控制Y降压启动控制线路,8,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,KT延时断开的动断触头延时分断KMY线圈失电KMY主触头断开KMY动合辅助触头断开KMY动断辅助触头闭合KM主触头闭合KM动断辅助触头断开KT线圈失电电动机全压运行,KMY,KT,M3,KH,KH,2.时间继电器自动控制Y降压启动控制线路,9,L1L2L3,FU1,FU2,KM,KM,SB1,SB2,KM,U,V,W,QS,KMY,KM,KMY,KM,KMY,KT,KM,停:按下SB2,KMY,KT,M3,KH,KH,2.时间继电器自动控制Y降压启动控制线路,10,启动时，把定子三相绕组的一部分联接成三角形，另一部分联接成星形，每相绕组上所承受的电压，比三角形联接时的相电压要低，比星形联接时的相电压要高，电动机延边三角形降压启动，待电动机启动运转后，再将绕组联接三角形，全压运行。,四、延边降压启动控制线路,11,延边三角形降压启动电动机定子绕组的联接方式,原始状态,U1,U2,U3,W3,W1,W2,V2,V3,V1,12,延边三角形降压启动电动机定子绕组的联接方式,启动时,U1,U2,U3,W3,W1,W2,V2,V3,V1,13,延边三角形降压启动电动机定子绕组的联接方式,正常运转时,U1,U2,U3,W3,W1,W2,V2,V3,V1,14,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,延边三角形降压启动控制原理,L1L2L3,FU1,FU2,KH,KM1,KM2,U1,V1,W1,QS,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3,电路组成分析,M3,15,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FU1,FU2,KH,KM1,KM2,U1,V1,W1,QS,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3,合上电源开关QS,延边三角形降压启动控制原理,M3,16,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,KH,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3,按SB2KM3线圈得电,FU1,FU2,QS,延边三角形降压启动控制原理,M3,17,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,KH,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3,KM3联锁触头分断，对KM2联锁KM3主触头闭合联结成延边三角形KM动合辅助触头闭合,FU1,FU2,QS,延边三角形降压启动控制原理,M3,18,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,KH,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3,KM1线圈得电KM1自锁触头闭合,自锁,松开SB2KM1主触头闭合,电动机延边三角形降压启动,KT线圈得电,FU1,FU2,QS,延边三角形降压启动控制原理,M3,19,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,KH,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KT线圈得电KT延时断开的动断触头延时分断,KM3线圈失电KT延时闭合的动合触头延时闭合，KM2线圈得电,FU1,FU2,QS,延边三角形降压启动控制原理,M3,20,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,KH,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM3线圈失电KM3动合触头分断，KM3主触头分断，电动机失电惯性运行KM2线圈得电KM2自锁触头闭合，自锁,FU1,FU2,QS,延边三角形降压启动控制原理,M3,21,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,KH,KM1,KM2,U1,V1,W1,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,KT,KM3,KM2主触头闭合，电动机全电运行KM2联锁触头断开，KT线圈失电,KT触头复位,KM3,FU1,FU2,QS,延边三角形降压启动控制原理,M3,22,KT,KM2,SB2,KM3,KM1,KT,SB1,KM2,L1L2L3,FU1,FU2,KH,KM1,KM2,U1,V1,W1,QS,KM1,KM2,W3,U3,V3,W2,U2,V2,KM3,K