In a 3-phase ac power transmission system using synchronous generator
1. The steady-state power limits of both round rotor and salient pole machines are reached at θ = π/2 of their respective power angle characteristics.
2. The steady-state power limit of round rotor machines occurs at a much smaller angle θ as compared to that of salient pole machine power angle characteristics.
3. The steady-state power limit of salient pole machines occurs at smaller angle θ as compared to that of round rotor machine power angle characteristics.
4. The transient state power limits of synchronous generators do not depend on initial load just before the large change in load or on 3-phase fault.