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Thread: Neutral Currents in a Wye:g Transformer

  1. #1
    Join Date
    Oct 2012
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    Ontario
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    11

    Neutral Currents in a Wye:g Transformer

    I have an incoming service to a building at 347/600V Wye:g, 600A. A contractor has installed a step down transformer 347/600V to 480V Delta, the inspector passed the installation but now the transformer is overheating and there are both Neutral and Ground currents. I read through 'The Wyes of Wyes' but I can't get a clear answer on the issue - to make matters worse the transformer mfg doesn't 'necessarily see a problem with the connection as it has been completed'.... please help

  2. #2
    Join Date
    Feb 2003
    Location
    Connecticut
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    2,138
    Remove the neutral conductor from the primary side of the transformer.

  3. #3
    Join Date
    Feb 2003
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    Connecticut
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    2,138
    Oh, and also remove the neutral point to transformer enclosure bond on the primary.

  4. #4
    Join Date
    Feb 2013
    Location
    India
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    818
    I think your idea is to break the path for stray current through the transformer. But disconnecting primary neutral ground connection will give rise to unsymmetrical secondary voltages for unbalanced loads on a wye wye transformer.

  5. #5
    Join Date
    Jan 2008
    Posts
    7,422
    Quote Originally Posted by david luchini View Post
    Remove the neutral conductor from the primary side of the transformer.
    I agree it is acting like a grounding bank.
    BB+/BB=?

  6. #6
    Join Date
    Jan 2008
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    7,422
    Quote Originally Posted by Sahib View Post
    But disconnecting primary neutral ground connection will give rise to unsymmetrical secondary voltages for unbalanced loads on a wye wye transformer.
    Then it is a good thing that is not a concern for the OP since that is not what the OP has.
    BB+/BB=?

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