Have you ever tried to find a 50kVA unit with a 32V output? Talk about special equipment.
But that's a one time special order in the worst case. Try making special order power supplies that run on 277V for every computer, every network switch, every router, etc.
It's not practical to change out every piece of equipment to run on 277V. If it were, that's the direction I'd go. However, it is practical when building up a data center designed for around 240V L-N circuits to special order transformers needed to step the 277V down to around 240V.
What may be a useful question is weighing the cost of an off the shelf 277V to 240V isolation transformer at full capacity against the cost of a special order buck-boost transformer at the partial capacity buck-boost can work with. That's part of what I am pondering: could the buck boost approach be made practical. Several transformer manufacturers apparently will do a special order like that. The exact size would depend on the scale of the data center involved.
And there is the option to distribute 277V down to a group of rack cabinets and step it down to 240V or 244.5V on the scale that can utilize an off the shelf buck-boost transformer. One 7.5kVA buck boost transformer in 240:32 configuration could support 56.25kVA of load on that one phase (1/7.5 of the load is served by the 32V secondary in series on the 277V side, where the 1/7.5 is from the 240/32 ratio).
