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
    3
    0
    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
    123
    4
    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: http://www.allaboutcircuits.com/vol_2/chpt_10/5.html
    If you are still having problems, post again and we'll work it out.

    Regards
     
  3. liberty

    Thread Starter New Member

    Feb 22, 2007
    3
    0
    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 :)
     
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