Published:2011/9/14 20:36:00 Author:nelly | Keyword: Electric relay, open phase, protection | From:SeekIC
Asshowninthepicture,whenthemotorisrunningnormally,thevoltageofthemiddlepoint”E”isnothighinthethree-phaseYconnectionbalancedcircuit,sotheVD1isnotConducted,andthemultiunittubes(VT1、VT22)arecutoff.TherelayKisinthestateofrelease;afterthefaulthashappened,thepoint“E”increasestowardsthezerolinevoltage.TherectificationoftheVD1makestheemitterofmultiunittubeconduct,Kactuate.Theconstantclosepointopens,andthecontactorKMloseselectricpower.MotorMstopsturningaround.
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