Three Phase Generation and transformer

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hello All,

I am nearing completion of my 3 phase 20KVA Diesel powered generator. 
Yup, Portable power! The generator is currently wired 277/480V Wye. I 
have a 480v delta to wye step down transformer which would then be 
208/120 (with neutral). My HV supply wants to see 208v 3 phase and a 
neutral which in turn supplies 28KVDC.

   * is it ok to connect the generator 480v wye (sans neutral) to 
the Delta Primary of the step down transformer?
   * If so, how should the wye generator, delta-wye step down 
transformer, and wye HV step up transformer be grounded?

Does anyone know?

Thanks,
Jim Mora