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Categories >> Engineering >> Electrical Engineering
 
 


 

 
Question What is the d/f between DOL & star delta starter & automatic
star delta starter?
 Question Asked At :: Indeco, What Is The Rating Of Fuse In Building?, Wipro, Ninl, Engineering AC Machines Assigment, Dalkia, Novotel, Rajendra Mallick, Star Delta Starter Used For?, RMH CONTROL SYSTEMS, Acc Cement
 Question Submitted By :: ravi
I also faced this Question!!     Rank Answer Posted By  
 
Answer
in induction motor the torque is propotional to squre of
supply voltage in case of dol the motor directly connected
to supply so torque is more while in star delta the motor
is firstly connected to star hence voltage is reduced
torque will be less and when motor reaches its 80% of speed
it connects with delta with the help of timer then full
voltage is supplied hence less rating motor should be
started with dol but for high rating it should be with star
delta

 
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