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Topic Title: Star Delta Starter
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Created On: 03 February 2014 03:02 AM
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 03 February 2014 03:02 AM
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jackdaniel

Posts: 69
Joined: 29 November 2012

Let's say the LRA is 9A, Star Delta Starter will start the motor with 1/3 of the motor current, so the LRA for motor will be 3A with Star Delta Starter.Please correct me if I'm wrong
 03 February 2014 05:06 AM
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hktmah

Posts: 2
Joined: 14 August 2002

The main purpose of the starter is to reduce the starting current of the motor (not the running current). Let assume that the motor starting current is 60A. With the use of start-delta starter, the starting current can be reduced to 60/3A = 20A.
 06 February 2014 11:33 AM
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rjcomber

Posts: 34
Joined: 24 June 2002

As stated above, is for starting only as simple way of reducing starting current by reducing the voltage. Remember that it needs to be switched over to delta as soon as possible and not run star for more than 2-5 seconds. People set the changeover timers for to long, leaving motor running a a reduced speed and subsequently draw excees current for too long.
Time interval depends on the inertia of the whole system.
IET » Energy » Star Delta Starter

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