Zig Zag gounding xfmr for 100KW ground mount array

Giark

Member
Location
Eugene, Oregon
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
 
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?
 

GoldDigger

Moderator
Staff member
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.
 

jim dungar

Moderator
Staff member
Location
Wisconsin
Occupation
Engineer
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.
 

excel

New member
Solution for Effective Grounding

Solution for Effective Grounding

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.

Image 1.jpg image 2.jpg
 
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