Answer Question
Open-circuit test
The above figure is extracted from Cookbook Chapter 10 example. It states that, to achieve zero (negligible) current in the synchronous machine (SM) in steady-state, the voltage magnitude should be 13.8 kV, and angle should be -31.08 deg (to account for phase shift by the transformer and interface, Dt = 50 us). I understand the 30 deg phase shift of the delta-star winding. However, what is an interface time? How does an interface time affect phase shift?
Your advice is much appreciated. Thank you.