What most people don’t realize is that the worlds powers systems are not all alike. I’m not sure what Japans current is but in the UK its 50hz 220v, and the 3 phase is even different. I actually have a 25kw military powerplant that was made for either European 50 cycle or US 60hz cycle.
Yup. And even then there are differences here - 110v or 120v base, and the 2xx volt group has 208v, 220v, or 240v - both single phase or three phase. You want that in wye or delta? ;^)