basic 3-phase transformer question

If the secondary has a load on 2 phases but nothing on the third, Will one phase of the primary draw nothing?
RE

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Could you tell us what the primary and secondary vectors (connections) are for this transformer?
Steve Lockridge Alfa Transformer
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| If the secondary has a load on 2 phases but nothing on the third, | Will one phase of the primary draw nothing?
That depends on the transformer phase configuration. I would expect a WYE secondary for what you describe. But the primary could be WYE or DELTA. If the primary is also WYE, then the 2 corresponding phases of the primary will draw current, and the other will not. But if the primary is DELTA, two of the primary _windings_ will be drawing current with the phase in common between them having more current and the other two phases having less.
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