(a) A four-pole synchronous generator rated at 300 MVA 11 kV, 50 Hz has an inertia constant of H = 6 MJ/MVA. (1) Determine the stored energy in the rotor at synchronous speed. (ii) When the generator is supplying a load of 200 MW, the input increased by 15 MW. Determine the rotor acceleration when losses can be neglected. (iii) If the rotor acceleration in Q.4(a)(ii) is maintained for 10 cycles, find the change in rotor angle and the rotor speed in rpm at the end of 10 cycles.

Question
(a) A four-pole synchronous generator rated at 300 MVA 11 kV, 50 Hz has an inertia
constant of H = 6 MJ/MVA.
(1) Determine the stored energy in the rotor at synchronous speed.
(ii) When the generator is supplying a load of 200 MW, the input increased by
15 MW. Determine the rotor acceleration when losses can be neglected.
(iii) If the rotor acceleration in Q.4(a)(ii) is maintained for 10 cycles, find the
change in rotor angle and the rotor speed in rpm at the end of 10 cycles.

Image Transcription

(a) A four-pole synchronous generator rated at 300 MVA 11 kV, 50 Hz has an inertia constant of H = 6 MJ/MVA. (1) Determine the stored energy in the rotor at synchronous speed. (ii) When the generator is supplying a load of 200 MW, the input increased by 15 MW. Determine the rotor acceleration when losses can be neglected. (iii) If the rotor acceleration in Q.4(a)(ii) is maintained for 10 cycles, find the change in rotor angle and the rotor speed in rpm at the end of 10 cycles.

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