help .. stupid question on star delta power

Discussion in 'Homework Help' started by liberty, Feb 22, 2007.

  1. liberty

    Thread Starter New Member

    Feb 22, 2007
    hi guys sorry for appearing dumb, im only a first year student....
    as part of an assignment, my question reads as follows

    work out the calculated value of power for star and delta conditions

    i have the IP IL UP and UL values for an induction motor in both star and delta.
    do i simply multiply the phase voltage by the phase current in both conditions ?( this is meant to be a simple power calc with no impedance involved ) or do the line values get involved also ?
    please help i have been writing this assignment all night and my mind is melting
  2. subtech

    Senior Member

    Nov 21, 2006
    The only dumb question is the one that doesn't get asked.

    In a nutshell, the answer to your question is yes. The phase(winding) current multiplied by the phase (winding) voltage will yield the power in that winding.

    This site has a wonderful aid to understanding three phase circuits.
    Look here:
    If you are still having problems, post again and we'll work it out.

  3. liberty

    Thread Starter New Member

    Feb 22, 2007
    thanks very much for that. yes thats what it turns out i was being asked in my asignment, but i wasnt that clear on it at all .
    plus i was numbed out by hours of study ...
    cheers :)