Buck Boost Transformer Question

[LarryFine]

1. Since the three buck/boost transformers are all connected L-L, there is no reason for a neutral connection on the line side for the resulting autotransformers to work properly.

If the autotransformers were wired L-N, then a neutral would definitely be required, although a floating wye point would tend to float near ground.

The units in the OP are clearly wired L-N, not L-L.

 

[GoldDigger]

The units in the OP are clearly wired L-N, not L-L.

You are right, I misread the diagram badly. Thank you.

 

[LarryFine]

You are right, I misread the diagram badly. Thank you.

So, would you agree that the transformer bank's neutral should connect to the source neutral?

 

[GoldDigger]

So, would you agree that the transformer bank's neutral should connect to the source neutral?

Yes.