1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Line Current for 30kW 3 phase motor

  1. Mar 3, 2012 #1
    1. The problem statement, all variables and given/known data
    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.

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

    P=Average Power
    Il=Line Current
    Vl=Line Voltage

    3. The attempt at a solution

    The answer given is 50.94A
  2. jcsd
  3. Mar 3, 2012 #2


    User Avatar

    Staff: Mentor

    http://img7.imageshack.us/img7/8738/p0813.gif [Broken]
    Last edited by a moderator: May 5, 2017
  4. Mar 4, 2012 #3
    That's what I thought. This book has plenty of errors. Although it hasn't stopped me from learning a lot.
    Last edited by a moderator: May 5, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook