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Isolation Transformer Earth Wiring

Discussion in 'Technical Discussion' started by T.K., Feb 1, 2014.

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  1. T.K., Feb 1, 2014
    #1
    T.K.

    T.K. Senior Member

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    Location:
    Cairo - Egypt
    Can anyone confirm whether the earth wiring sequence in the attached isolation transformer wiring diagram is correct or incorrect.

    Thanks.....

    Attached Files:

  2. Capt Ralph, Feb 1, 2014
    #2
    Capt Ralph

    Capt Ralph Senior Member

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    Yes.
    The grounding relay is a newer thought and future isolates the ship from the dock. Future inverter theories involve an open green wire also.

    IMO, a galvanic isolator would work here fine also. Pending on so many codes from around the world, you may not be able to do that.

    Why do you think there is a problem?
  3. T.K., Feb 2, 2014
    #3
    T.K.

    T.K. Senior Member

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    The shore cable earth wire connects with the earth wire from the isolation transformer on the same DIN rail which means that the isolation transformer has been bypassed and is not serving its purpose.
  4. Capt Ralph, Feb 2, 2014
    #4
    Capt Ralph

    Capt Ralph Senior Member

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    Green wire is still separate from the ship at point E (bottom left @ x-fmr). Then to Item E (by-pass box), then to transformer case and ships green wire system ( bottom & bottom left @ x-fmr). Pending action of the relay box, green wire should be isolated when needed open.

    (to many point Es.) You should have different d-rails for ships & shore green wire connects.

    Has your system already installed without a by-pass box?
  5. T.K., Feb 8, 2014
    #5
    T.K.

    T.K. Senior Member

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    Thanks rcrapps, the shoreline earth wire has been removed from the ship's earth DIN rail and connected directly to the earth stud on the isolation transformer. This has solved the problem. It was an installation error.

    Thanks again for your help.
  6. Capt Ralph, Feb 8, 2014
    #6
    Capt Ralph

    Capt Ralph Senior Member

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    Outstanding work. Thank you for the follow up.

    ,Ralph