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what is the minimum kilowatt to use star delta connection for motors

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tarekmontaser

Electrical
Joined
Mar 1, 2009
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4
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EG
what is the minimum kilowatt to use star delta connection for motors ?
 
If you mean the reduced voltage wye-delta starting method there is no general answer. It depends on the what kind of voltage sag is allowed by the local power company or the tolerable one that will work in the immediate area.

In all cases wye-delta starters are inferior to any other reduced voltage starting method. It often causes many problems with no benefit at all.

Use a soft starter instead.

Keith Cress
kcress -
 
Keith, what you say applies to open transition wye-delta starters. I'm not sure I'd go that far in condemning closed transition wye-delta starters.
 

Way Out West, for motors operated at the facility service voltage, utilities generally have pat rules on this {like, say 40Hp} but for service at medium or high voltages, it’s subject to engineering review.

I have worked on EU-originated process equipment where Y-D starting was applied to as low as 3Hp.

 
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