1. Not finding help here? Sign up for a free 30min 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!

Two wattmeter method question

  1. Aug 20, 2011 #1
    1. The problem statement, all variables and given/known data
    Wattmeters are in the lines B and C of a three-wire, 173.2 volt, CBA system which supplies a balanced load. Find the wattmeter readings if line current Ia= 32.7 angle of (-41.9). Answer: 1170, 5370 w


    2. Relevant equations
    Wb= Vba Ib cos ( angle between Vba and Ib)
    Wc= Vca Ic cos (angle between Vca and Ic)
    Wb+Wc = 3 phase power
    Wc-Wb = 3 phase reactive power


    3. The attempt at a solution
    I have solve for Vba , Vca Ic and Ib by phasor method..
    Wb = (173.2 ) (32.7) cos ( 180- 78.1)
    Wb= - 1167.87 w
    Wc= (173.2) (32.7) cos (161.9 - 120)
    Wc= 4215.5 w
    my problem is when i checked my answer on the book my answers are not like in the book..
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?



Similar Discussions: Two wattmeter method question
  1. Measurement Method (Replies: 0)

  2. Euler's Method (Replies: 0)

Loading...