When does star/star transformers work satisfactorily?

When does star/star transformers work satisfactorily? Correct Answer Load is balanced only

With the unbalanced load connected to the neutral, the neutral point shifts thereby making the three line-to-neutral (i.e. phase) voltages unequal. The effect of unbalanced loads can be illustrated by placing a single load between phase (or coil) a and the neutral on the secondary side.
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