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Hi all, thanks for your comments. I also think that there is some cofusion. Having in mind that we are talking about a 3 leg distribution transformer 400 kVA 33/0.4 kV ZNyn11 to supply the auxiliaries of an offshore substation (various UPS rectifiers are part of the substation auxiliaries)...

Replying to Bill's questions: It is a 400 kVA 33/0.4 kV ZNyn11 distribution transformer to supply the auxiliaries of an offshore substation (various UPS rectifiers are part of the substation auxiliaries). See below: On the primary side we have 3 cables from the 33 kV bus and on the secondary...

Hi all, To sum up what I have understood: - As in my case we have a ZNyn transformer -> no need of stabilization delta. - Zero sequence currents will appear when having unbalance load or in case of earth fault and will circulate through both neutral points and the ground. Then 2 questions...

Thanks for your reply. I think I am starting to better understand the behaviour of the Y-Y transformers. Let's see if I am able to elaborate a good technical justification to convince the client that a ZNyn11 transformer is the best choice for our application and not ZNyn(d)11.

Hi RRaghunath, Thanks for your reply. You are right that my question was not very clear. Why tertiary winding is not relevant on ZYyn transformers?

Dear all, Is it mandatory on Y-Y transformers to install a tertiary stabilizing winding? For example in an application of earthing auxiliary transformer ZNyn11 33/0.4 kV 400 kVA is there any way to omite and save the tertiary winding? Best regards.