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Electric relay open phase protection circuit

2016-09-21 03:06  
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Electric relay open phase protection circuit
Asshowninthepicture,whenthemotorisrunningnormally,thevoltageofthemiddlepoint”E”isnothighinthethree-phaseYconnectionbalancedcircuit,sotheVD1isnotConducted,andthemultiunittubes(VT1、VT22)arecutoff.TherelayKisinthestateofrelease;afterthefaulthashappened,thepoint“E”increasestowardsthezerolinevoltage.TherectificationoftheVD1makestheemitterofmultiunittubeconduct,Kactuate.Theconstantclosepointopens,andthecontactorKMloseselectricpower.MotorMstopsturningaround.