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!

Power factor correction with two loads

  1. Sep 5, 2012 #1
    1. The problem statement, all variables and given/known data

    http://i1226.photobucket.com/albums/ee410/jean28x/8b1ad092d9dd25a8f10f1672c0073d97.jpg

    Vs = 480<0 rms.
    P1 105 W; pf1 0.7 lagging; P2 5 × 104 W; pf2 0.95 leading.

    2. Relevant equations

    S = sqrt(P^2 + Q^2), = Vrms* Irms(conjugate)


    3. The attempt at a solution

    I know how to calculate the capacitance with one load, but how do I work with the two loads? Do I find the capacitance of both and then add them up?
     
  2. jcsd
  3. Sep 6, 2012 #2

    NascentOxygen

    User Avatar

    Staff: Mentor

    Where did you get the detail that one is lagging and the other leading?
    If they both needed added capacitance, then because the loads are in parallel you can add the two capacitances. But if you are correct in saying one load has leading pf, then that load doesn't require added parallel capacitance.

    First step: add the reactive currents of the two loads. Is it overall capacitive or inductive?
     
  4. Sep 7, 2012 #3

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Power factor is an even function of the phase angle, meaning the phase itself can be either + or -, requiring different reactive components to bring the phase to zero. So you need to have this defined for you first.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Power factor correction with two loads
  1. Power Factor correction (Replies: 13)

  2. Power factor correction (Replies: 16)

Loading...