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three phase xmfr question

Discussion in 'Electronic Basics' started by Eric R Snow, Dec 2, 2003.

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  1. Eric R Snow

    Eric R Snow Guest

    Greetings All,
    I have a three phase xmfr with nine secondary windings. On each of the
    three "legs" of the core are three windings. Each winding on the first
    "leg ' is connected to a winding on the next "leg" and so on in the
    delta configuration. So there are three sets of windings with each set
    connected delta. I need to connect all sets parallel to get the needed
    power. These will then be connected to a three phase rectifier. Can
    the windings on each "leg" just be connected together? All the
    windings are rated the same for voltage and current.
    Eric R Snow
  2. Don Kelly

    Don Kelly Guest

    They can be connected in parallel. However you must be sure that the
    polarities are correct. One way is to connect the windings together at a
    corresponding corner of each delta (i.e. one common point), energise and
    check the voltages between deltas at the other corresponding corners. These
    should be 0 or very near 0. This is likely the case that will occur. If not
    then a delta may be reversed with respect to the first- you don't want that.
  3. als

    als Guest

    Seems to me, the better option would be to run each
    separate set to its own bridge, and then connect them
    in parallel. Less concern about winding imbalances.
    Smaller (less expensive) rectifiers.
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