Line Current for 30kW 3 phase motor

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  • #1
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Homework Statement


Calculate the line current required for a 30kW 3 phase motor having a power factor of 0.85 lagging if it is connected to a balanced source with a line voltage of 440V.


Homework Equations


P=√3Vl*IlCos ∅
Il=[itex]\frac{P}{√3VlCos ∅}[/itex]


P=Average Power
Il=Line Current
Vl=Line Voltage
∅=∅v-∅i=∅Z


The Attempt at a Solution


Il=[itex]\frac{30000}{440√3\times0.85}[/itex]=46.31A

The answer given is 50.94A
 

Answers and Replies

  • #2
NascentOxygen
Staff Emeritus
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Homework Statement


Calculate the line current required for a [strike]30kW[/strike] 33kW 3 phase motor
http://img7.imageshack.us/img7/8738/p0813.gif [Broken]
 
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  • #3
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http://img7.imageshack.us/img7/8738/p0813.gif [Broken]

That's what I thought. This book has plenty of errors. Although it hasn't stopped me from learning a lot.
 
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