Lots of 3-phase generators are the 12-lead type. Form the hookup diagrams I have seen, these are basically pairs of 120 volt windings on each phase. Voltage regulation can then manage them between 100 and 140 volts. With that and several wiring configurations, most every 3 phase setup can be obtained, either wye (3-star) or delta.
What I am wondering about is doing a different setup. Running the voltage right at 120 per winding, I want to wire the two windings of each phase in series to get 240 volts, and wire the center point in to get an Edison style 240/120 volt system (120-0-120). And I want to do this on each of the three phases connecting that center point together between them. So there would be 7 wires plus a separate ground coming out.
Would this be possible to do?
The vector diagram would be like this:
- * \ / \ /
The idea is to get both 240 volts and 120 volts at full generator capacity and WITHOUT using funny phasing like this:
- / \ / \
- *-----*
which derates the capacity, anyway. Of course with the 7 wire system, it would require 3 separate single phase breaker panels (and/or 2 separate three phase breaker panels).