Step-down Transformer

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We have a step-down transformer (415 / 380 V). It has 9 terminals on primary side (3 each of red, blue and yellow color) and 3 terminals on secondary side.

The connections to its primary side were like that the input supply (415V) was connected to middle wires of red, blue and yellow groups.
I mean that phase 1 was applied to second red wire, phase 2 was applied to second yellow wire. Likewise, phase 3 was applied to second blue wire.

Now what i want to ask is that, if i will apply the input on first wire of red, yellow and blue wires, then, what will be the output on the secondary side. I know it will be different. But, please help me by giving a brief explanation of this kind of transformer.
 
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