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iftikhar129
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Join Date: Dec 2011
Posts: 67

KW & PF

07/11/2012 1:04 AM

An alternator is designed at 1746KVA at unity power factor. what will be its Maximum rated KW rating at 0.9pf.

An alternator is designed at 1064kw at 0.8pf. What will be its maximum rated Kw at unity pf.

Thanks in advance.
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Tornado
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#1

Re: KW & pf

07/11/2012 1:30 AM

1746 KVA x 0.9 pf ≈ 1571 KW.

1064 KW ÷ 0.8 pf = 1330 KVA = 1330 KW (if pf = 1).

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PeterT
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#2

Re: KW & PF

07/11/2012 7:35 AM

Homework?

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pnaban
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#3

Re: KW & PF

07/12/2012 1:22 AM

You should consider the rating of the prime mover too.

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gajendrasingh01
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Join Date: Nov 2007
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#4

Re: KW & PF

07/14/2012 2:54 AM

formula is as follows

KW RATING = KVA RATING INTO PF

THANKS

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Tornado
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#5
In reply to #4

Re: KW & PF

07/14/2012 3:13 AM

Actually, KW = KVA × PF.

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