poco

[domnic]

Are all poco substations y connected on the secondary of the transformer if not what reason they are not ?

 

[kwired]

Are all poco substations y connected on the secondary of the transformer if not what reason they are not ?

If only line to line voltage loads are supplied there is no need for a system with a neutral.

Transmission lines are probably more common to be from a delta system but local distribution is often (but not always) using line to neutral connections on a wye system.