# The three-phase synchronous generator described in Example 3.4 is now operated, on a 25.2-kV… 1 answer below »

The three-phase synchronous generator described in Example 3.4 is now operated, on a 25.2-kV infinite bus. It is found that the internal voltage magnitude 14 = 49.5 kV and that the power angle S = 38.5°. Using the loading capability diagram of Fig. 3.14, determine graphically the real and reactive power delivered to the system by the machine. Verify your answers using Eqs. (3.38). Example 3.4. A 60-Hz three-phase generator rated at 635 MVA, 0.90 power factor, 24 kV, 3 600 rpm has the operating chart shown in Fig. 3 . 14. The generator is delivering 458.47 MW and 1 14.62 Mvar at 22.8 kV to an infinite bus. Calculate the excitation voltage E; using (a) the equivalent circuit of Fig. 3.8(a) and loading diagram of Fig. 3.14. The synchronous reactance is Xd = 1 .7241 per unit on the machine base and resistance is negligible. (b) the