I was provided the data to model a 230/34.35 kV 3 winding transformer for a wind farm with the +/- 12.5 % regulation and +/- 8 taps. The primary-secondary impedance value for the transformer is 11.80% at nominal and 12.4% (8R tap position, 258.75 kV) and 11.81% (8L tap position, 201.25 kV) all...