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Zig Zag gounding xfmr for 100KW ground mount array

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    Zig Zag gounding xfmr for 100KW ground mount array

    The utility is requiring a zig zag grounding xfmr for a 100kw ground mounted array. I have xfmr sizing from them. I know there is a protective relay required to make this setup work. I imagine there are a variety for ways to accomplish this. In hopes of not reinventing the wheel does anyone have a preferred method/ components that work? Thanks, John

    #2
    Originally posted by Giark View Post
    The utility is requiring a zig zag grounding xfmr for a 100kw ground mounted array. I have xfmr sizing from them. I know there is a protective relay required to make this setup work. I imagine there are a variety for ways to accomplish this. In hopes of not reinventing the wheel does anyone have a preferred method/ components that work? Thanks, John
    Interesting. I dont quite follow though. Where is the zig zag to go? Is there already an ungrounded service supplying the site that this will be tied into?
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

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      #3
      There is another thread about a POCO which is requiring a zig-zag grounding transformer even though the service itself is a grounded wye. There was never a good engineering explanation for that requirement.

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        #4
        Originally posted by GoldDigger View Post
        There is another thread about a POCO which is requiring a zig-zag grounding transformer even though the service itself is a grounded wye. There was never a good engineering explanation for that requirement.
        Most of the time, the issue involves the 'distributed generator' becoming 'islanded' from the utility grounded-wye system.


        Generically the term is 'artificial neutral'. A Zig-Zag is simply one style of 'grounding transformer',another common one is often called a 'wye-delta'.
        Impedance grounding, like HRG, is a separate issue from providing a ground reference.
        Just because you can, doesn't mean you should.

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          #5
          Originally posted by jim dungar View Post
          Most of the time, the issue involves the 'distributed generator' becoming 'islanded' from the utility grounded-wye system.
          Which was somewhat odd given that the distributed generation in question was a grid tie inverter array which automatically shuts down when islanded.

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            #6
            Originally posted by GoldDigger View Post
            Which was somewhat odd given that the distributed generation in question was a grid tie inverter array which automatically shuts down when islanded.
            Are you saying someone didn't look at all the details before making a judgement?
            Just because you can, doesn't mean you should.

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              #7
              Originally posted by jim dungar View Post
              Are you saying someone didn't look at all the details before making a judgement?
              I think that I am saying that once the rule was written it was no longer anybody's job to see whether it made sense.

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                #8
                Originally posted by GoldDigger View Post
                I think that I am saying that once the rule was written it was no longer anybody's job to see whether it made sense.

                Just because you can, doesn't mean you should.

                Comment


                  #9
                  Solution for Effective Grounding

                  Originally posted by Giark View Post
                  The utility is requiring a zig zag grounding xfmr for a 100kw ground mounted array. I have xfmr sizing from them. I know there is a protective relay required to make this setup work. I imagine there are a variety for ways to accomplish this. In hopes of not reinventing the wheel does anyone have a preferred method/ components that work? Thanks, John
                  Hello Giark, I have a following solution which you might like to use for this application.
                  See if it make sense for you.

                  Click image for larger version

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