Transformer vector group can gives informations about the phase angle difference between the primary high voltage side winding and the low voltage side secondary winding.
Every time when synchronizing a generator electrical engineer must check transformer vector group because failing to do can cause severe damage to the transformer itself and the whole power system as well.
The most common configuration Yd11 tell us that there are plus 30 degree phase shift while Yd1 indicate that there are minus 30 degree phase shift between HV and LV side so it is not possible to parallel Yd1 and Yd11 if they are feed from the same source.
You can learn more about transformer in detail here including transformer vector group and different type of winding configurations.
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