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drofamps
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Join Date: Jan 2009
Location: Philadelphea area
Posts: 4

KVA Rating of Alternator Winding

01/24/2009 11:48 PM

Each phase of a three phase alternator is rated at 42 KVA and 120 volts. It is wye connected, find (a) the line current and (b) the line voltage.

I do not understand if 42 KVA is the rating of the alternator or just one winding ?

Need some help

Thanks

drofamps
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sb
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Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#1

Re: kva rating of alternator winding

01/25/2009 2:29 AM

Ring up your professor and get clarification,

This has happened a lot of times with my son, you assume and answer wrong and get a D (and if lucky C - depending on your professor)

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drofamps
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Join Date: Jan 2009
Location: Philadelphea area
Posts: 4
#2
In reply to #1

Re: kva rating of alternator winding

01/25/2009 9:26 AM

Thanks for the reply.

So if the alternator has a 42KVA rating.

Does each winding have a rating of 42 KVA or 42/3 KVA?
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wareagle
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United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#3
In reply to #2

Re: kva rating of alternator winding

01/25/2009 4:14 PM

Quote "Each phase of a three phase alternator is rated at 42 KVA and 120 volts. It is wye connected, find (a) the line current and (b) the line voltage."

Alternators, generators, transformers are rated in kva. That's the total rating. These devices are not rated by phase. So you need to calculated the line current and line voltage based on the 42 kva. Show us you work and we will comment on it.
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Anonymous Poster
#4
In reply to #3

Re: kva rating of alternator winding

01/25/2009 5:40 PM

Thanks

That explains a lot. Now I can figure it out.

Thanks again

drofamps
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HoleInTheSnow
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Join Date: May 2008
Location: Europe
Posts: 285
Good Answers: 9
#5
In reply to #3

Re: kva rating of alternator winding

01/26/2009 4:52 AM

wareagle,

GA. Straight to the point and no BS.

Regards

Mr. W.A Snow
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