Hello Electricpete, May I just ask how you arrived with the value Vgn= 72.4 Angle 9.6 degrees?
Because in my case, my line to ground voltages are 38V, 73.7V, and 92.1V. My line to line voltages are 54.4V, 53.2V, and 53.3V. The transformer is 4160/480 wye-delta. However, we injected...