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

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

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

(OP)
what is the minimum kilowatt to use star delta connection for motors ?

RE: 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 - http://www.flaminsystems.com

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

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.

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


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.
   
 

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

Yeah davidbeach!  I just never see closed transition ones.  I would certainly agree.

Keith Cress
kcress - http://www.flaminsystems.com

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