Trouble understanding specs of 3fase transformers.

[TheUnnamedNewbie]

So I have an assignment I'm trying to do. It regards 3 phase transformers (not going to copy the assignment because I want to solve it myself). I do have a question about the specsheets tho.
I'm given that I have a transformer with following specs:

• Wired Yy0,  36kV/400V
• Snom (in KVA) = 4000
• Po (kW) is 5.5
• Pk (kW) is 33
• And uk is 6.0%

Now my question is regarding the voltages. The rated 36kV/400V are those line or phase voltages? Or is it impossible to know? (the assignment mentions it will not provide you with all the necessary information and I will have to make assumptions). It would make sense if it were linevoltages as the line voltages in Belgian domestic circuits are 400V, but I would rather double check since is the first step in a long assignment and I'd rather not go wrong now.

EDIT: corrected the use of "fase" to "phase"

[T3sl4co1l]

Somewhere in the textbook, it should say the customary measurement is line-to-line.

Also, it's "phase".

Tim

[TheUnnamedNewbie]

Thanks! I went through the book 2ce and didn't really find any mention of it... Probably some footnote somewhere I read over.

And I feel stupid for writing fase instead of phase,I should've known... 

[tautech]

Somewhere in the textbook, it should say the customary measurement is line-to-line.

Also, it's "phase".

Tim

+1
Here 3 phase is 415VAC between phases and 230VAC to mains neutral/GND

[TheUnnamedNewbie]

Somewhere in the textbook, it should say the customary measurement is line-to-line.

I think I somewhat found it: In the textbook, it is mentioned that in all equivalent circuits for power/voltage/current/whatnot calculations, it will be assumed that the transformers are actually Yy0, no matter what their actual internal wiring scheme is.

Now I'm just stuck on some other stuff but I'm gonna spend some more time looking at it and reading through the literature - our lecturer isn't consistent in his use of symbols, one subsection Ikn=Nominal short circuit current, next subsection he uses Ik for the same thing... But never does he explicitly mention what he will be using from this point on, so you just have to connect the symbols yourself and hope you did it right... Sure it might be obvious once I'm familiar with the subject and concepts, but for now it's really quite confusing...  /endrant