Answer Posted / eduardo

In a delta connection you don´t have any access to the "mid
point" or if you prefer to the "neutral".
In a star connection you will have a four(th) terminal, that
you can connect to earth or use it as neutral conductor.
For example if you have a three phase power line at 15 kV,
and want 400 V and 230 V you can connect the primary in
delta (you don´t need the extra connection) and the
secondary at star. (delta- star)
Now you will have 400 V between any 2 phases and 230 V
between one phase and the star point of the transformer.

If you connect the secondary in delta you will not have 230
V, because you don´t have the 4th terminal. (delta-delta)

Please note that in star one winding of the transformer will
have 5,8 kV (10000V / sqrt(3)). In delta connection you will
have in one winding 10 kV. So verify the tension and the
connetction type of the transformer. (both primary and
secondary).

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