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Grounded Y û Y MV transformers compare to ? û Y gounded Tr

Grounded Y û Y MV transformers compare to ? û Y gounded Tr

Grounded Y û Y MV transformers compare to ? û Y gounded Tr

(OP)
Would any body tell me what are the benefits of both grounded Y – Y medium voltage transformers compare to generally used Δ – Y grounded transformer?  

RE: Grounded Y û Y MV transformers compare to ? û Y gounded Tr

Less chance of ferro-resonance.

Grounded wye winding can have graded insulation and insulated for line-ground voltage which may make it less expensive.

 

David Castor
www.cvoes.com

RE: Grounded Y û Y MV transformers compare to ? û Y gounded Tr

The grounded wye-grounded wye provides a zero sequence connection between primary and secondary while the delta-grounded wye does not.  The delta-grounded wye provides a ground source on the wye side while the grounded wye-grounded wye does not (presence of a delta tertiary changes things).  For some applications one set of characteristics is more desirable than the other.

RE: Grounded Y û Y MV transformers compare to ? û Y gounded Tr

(OP)
Hi Dpc, and David, thank you very mach for your response. Now I believe that in my case where the voltage levels are 13.8 KV and 4.16 KV with transformers power at 5 MVA levels, DRY types the transformer dimension would be the ONLY ADVANTAGE for Y – Y transformers selection.

RE: Grounded Y û Y MV transformers compare to ? û Y gounded Tr

Hi.
Is depend on your application.
What is a 13.8kV grid.
You have check, if you can use ground wye, it will be second ground point in the sistem, not always possible.
Best Regards.
Slava

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