Three phase question

Discussion in 'Homework Help' started by rmanach, Jan 21, 2009.

  1. rmanach

    Thread Starter New Member

    Jan 21, 2009
    1
    0
    Hello, I'm thoroughly confused by three phase right now and am working on a homework for my power class.

    Is 480/277 always WYE? The 480 refers to phase to phase voltage, where as the 277 refers to phase to neutral, correct?

    So if I have a 480/277 4 wire setup, then it has to be wye?

    If it is wye, or if it is delta - what would be my line current if I had say a 10kW load?

    I'm just confused by the notation since there is no Y in the middle (480Y277) Is that all there is to it?

    Sorry if this is a dumb question, but I thought there was some sort of standard on this notation until I came across this.
     
  2. MareBear

    Member

    Oct 29, 2008
    22
    0
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Maybe it is wye because a delta connection does not have a neutral wire. Or maybe is a delta with a ground wire.

    I=P/(V*pf*sqrt3)

    I=line current (A)
    P=real power (W)
    V=line voltage (V)
    pf=power factor
     
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