Currently have a 277/480v, Wye 3 Phase, 4 wire service. Would like to use a transformer to step down to a 220/480v, Delta 3 Phase service.
Has anyone had a similar need or has a best practice solution to supply each leg of a 3 phase wye at 277 step down to a 3 phase 220v each leg.
Application...some machines are running on 277 / 3 phase...other heaters and units need to run on 220 / 3 phase.
Don't necessarily want to run another service to the building...would like to know if there is a best solution transformer unit that would provide the step down....Thank you...

 

There is a buck-boost transformer for each phase but may be large if the Kva requirement is high.
Max.