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  #1  
Old 12-07-2007, 01:39 AM
geraray
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Exclamation CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

Hello,

Please help how do I calculate Current (Amps) in a 3 phase circuit with 6.4KW 400V supply.

Thanks
Ray
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  #2  
Old 12-07-2007, 08:18 PM
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Default Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

for a three phase circuit,
Current (3 phases):
I = P / √3 Vl×cos φ
or
I = P / 3 Vp×cos φ

P = power (watts), I = current (amperes), Vl = line voltage (volts), Vp = phase voltage (volts), φ = power factor angle between voltage and amperage

Translated:
Current = Watts / √3 Line Voltage × cos Power Factor Angle
Or
Current = Watts / 3 Phase Voltage × cos Power Factor Angle

don't ask me what all that greek means, I found it here: http://www.sengpielaudio.com/calculator-ohm.htm
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  #3  
Old 07-23-2010, 07:37 AM
bhujbalshivaji@yahoo.in
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Default Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

Please help how do I calculate Current (Amps) in a 3 phase circuit with 6.4KW 400V supply.

Thanks
Ray[/QUOTE]
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  #4  
Old 07-23-2010, 07:19 PM
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Default Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

Simplified answer,
P = V x I x √3
6,400 W (6.4kW) = 400 x I x 1.732
I = 9.2 A
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  #5  
Old 03-12-2011, 11:48 PM
RAJESH KUMAR
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Thumbs up Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

In case of 3 Phase calculation, We can use the formula,

I = W / ROOT-3 x V x PF

ie, W = WATTS, ROOT-3 = 1.732, V = VOLT, PF = 0.83

So,W = 6.4KW = 6400WATTS, V = 400

By Using the above formula,

I = 6400 / 1.732 x 380 x 0.83

= 6400 / 546.272

= 11.71A
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  #6  
Old 03-12-2011, 11:52 PM
RAJESH KUMAR
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Thumbs up Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

In case of 3 Phase calculation, We can use the formula,

I = W / ROOT-3 x V x PF

ie, W = WATTS, ROOT-3 = 1.732, V = VOLT, PF = 0.83

So,W = 6.4KW = 6400WATTS, V = 400

By Using the above formula,

I = 6400 / 1.732 x 380 x 0.83

= 6400 / 546.272

= 11.71A

Email : rajeshkumarbec@yahoo.com
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  #7  
Old 04-01-2012, 03:22 AM
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Default Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

Quote:
Originally Posted by RAJESH KUMAR View Post
In case of 3 Phase calculation, We can use the formula,

I = W / ROOT-3 x V x PF

ie, W = WATTS, ROOT-3 = 1.732, V = VOLT, PF = 0.83

So,W = 6.4KW = 6400WATTS, V = 400

By Using the above formula,

I = 6400 / 1.732 x 380 x 0.83

= 6400 / 546.272

= 11.71A

Email : rajeshkumarbec@yahoo.com
its not 380V for your information, the given voltage is 400V i know what you are trying to say but sorry to say it is 400V.
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  #8  
Old 04-03-2012, 06:54 AM
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Default Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

For a three phase

P = 1.73 * I * V * p.f

I = P / ( 1.73 * V * p.f)

I = 6400 / ( 1.73 * 400 * 0.8 )

I = 6400 / 553.6

I = 11.56 A
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  #9  
Old 06-23-2012, 11:39 PM
Navin
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Default Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

as we got I now if we wnt to calculate energy consumption can v use
E=V*I or sqrt3*V*I or sqrt3*V*I cos phy for three phase syatem
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  #10  
Old 08-08-2012, 10:20 PM
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Default Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

if Power is given in KW, then we don't need to use Power Factor (PF) because
kW = V x I P.F. x ÷ 1000 and
kVA = kW ÷ P.F. so you can calculate as below.

P= 6.4KW
V= 400V
I= ?
I (Amp) = P*1000/(√3*400) » 6400/(692.8) = 9.23
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