Transformer Connections

1. The transformer at its base (if you want to call it) creates voltage as per primary. Try to visualise the equivalent circuit of the system.

Assume the input grid to be large enough to be infinite. So the unbalanced load (drawing unbalanced current in the phases) will have the unequal voltage drop through the equivalent impedances. Only way too balance these may be to go for unbalance primary voltage to compensate and that may not be practical.

2. Think again from equivalent circuit- for neutral to ground resistance to come in picture there must be a curent flow through to ground. Whether your unbalanced load will generate a current through it (and complete the circuit?)

I also ask you of something else, if in a solidly grounded wye system happens a ground(phase to earth) what happens to the neutral point with reference to earth? for example a bolted fault and the voltage that drops in earth electrode will cause the neutral to shift but in some books it shows no shift on vector diagrams, so pls tell me what happens to neutral if a ground fault occurs?