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BVREDDY
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Motor Current

06/24/2013 5:48 AM

Dear Friends.Please answer:What is the current of an 647kW, 577V three-phase load with cosFI=0,91 ? Round result to WHOLE number (without -A- or -Amps-).
RegardsBVReddy.

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PWSlack
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#1

Re: Motor Current

06/24/2013 5:53 AM

So obviously: homework.

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rogerggbr
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#2

Re: Motor Current

06/24/2013 7:17 AM

If you know the kW, presumably you already measured the Amps?

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TonyS
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#3

Re: Motor Current

06/24/2013 10:11 AM

Going to be a bit difficult to give a figure without A or Amps in it.

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JRaef
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#4
In reply to #3

Re: Motor Current

06/24/2013 11:05 PM

Going to be a bit difficult to give a figure without A or Amps in it.

He could use I. As in "I = 34"

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TonyS
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#6
In reply to #4

Re: Motor Current

06/26/2013 10:07 AM

True

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Pattabhiraman
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#5

Re: Motor Current

06/25/2013 5:06 AM

You can go with either 711 or 712 if you have a fetish for whole nos. Please note that I have not added "A" or "Amps" as instructed, but if you have any other terms of endearment addressing electrical current, you are free to do so.
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7anoter4
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#7

Re: Motor Current

06/30/2013 1:11 PM

I agree, it is funny, a bit.But also.. inefficently!

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dhayanandhan
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#8

Re: Motor Current

02/04/2014 3:50 AM

Deatr Mr BVREDDY,

Use the Formula Sq.Root3 x V x I x Cos Fhi = Power in KW X 1000

i.e 1.732 x 577 x I x (0.91) = 647 x 1000.

The Un-Known in the above equation is the Current, I which you can calculate.

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7anoter4 (1); dhayanandhan (1); JRaef (1); Pattabhiraman (1); PWSlack (1); rogerggbr (1); TonyS (2)

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