I have just run acrossed a system where we have a site fed with a 2-phase primary and an open delta to feed a 3-phase corner grounded 480 vac pump. I wonder how this affects things?
It seems that I should get 480 on 2 lines and something in the range of 800 volts on the 3rd leg, but there must be other ways to connect the transformers to the system for the report that I received was that:
L1-grd NL (no Load)=501 vac, FL (under load conditions)=489 vac
L2-grd = 0 volts
L3-grd NL=450 vac, FL=446 vac
With load currents of:
L1=28.6 amps
L2=13.9 amps
L3=24.1 amps
How would these tranformers be connected to give this? What effect does this have on the load? What would be the phase angle relationship?
Thanks, Shane
