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basic 3-phase transformer question

Discussion in 'Electrical Engineering' started by Ryan Evans, Mar 7, 2007.

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  1. Ryan Evans

    Ryan Evans Guest

    If the secondary has a load on 2 phases but nothing on the third,
    Will one phase of the primary draw nothing?

    RE
     
  2. Guest

    | If the secondary has a load on 2 phases but nothing on the third,
    | Will one phase of the primary draw nothing?

    That depends on the transformer phase configuration. I would expect a
    WYE secondary for what you describe. But the primary could be WYE or
    DELTA. If the primary is also WYE, then the 2 corresponding phases of
    the primary will draw current, and the other will not. But if the
    primary is DELTA, two of the primary _windings_ will be drawing current
    with the phase in common between them having more current and the other
    two phases having less.
     
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