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#1




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 
#2




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/calculatorohm.htm
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#3




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] 
#4




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 
#5




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 / ROOT3 x V x PF ie, W = WATTS, ROOT3 = 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 
#6




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 / ROOT3 x V x PF ie, W = WATTS, ROOT3 = 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 
#7




Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply
Quote:

#8




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 
#9




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 
#10




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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