Advanced Power Systems-Tutorial-4.pdf - EEET2403 Advanced Power Systems Tutorial 4 Transient Stability-1 Question 1 A 50 Hz 200 MVA 4-pole generator has

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1 AV /2018 EEET2 403 Advanced Power Systems Tutorial 4 : Transient Stability-1 Question 1: A 50 Hz, 200 MVA, 4-pole generator has an inertia constant H of 4 seconds. (a) What is the synchronous speed of the generator? (Ans. 1500 rpm) (b) What is the KE of the rotor at synchronous speed? (Ans. 800 MJ) (c) What is the moment of inertia of the rotor? (Ans. 64846 kg m 2 ) Question 2: A 50 Hz, 100 MVA generator is connected to a busbar at a voltage of 1.02 5.2 o pu. The generator has a transient reactance of 0.5 pu. What is the internal voltage of the generator when it delivers (80 MW + j 40 MVAR) to the busbar? (Ans. 1.2777 23.07 o pu) Question 3: A 50 Hz, 500 MVA, 2-pole, generator has an inertia constant of 4.8 s based on its own rating. When the generator is supplying a 400 MW load, a sudden short circuit occurs on the terminals of the generator. (a) What is the KE stored in the rotor before the fault? (Ans. 2400 MJ) (b) What is the KE of the rotor 200 ms after the fault occurs? (Ans. 2480 MJ) (c) What is the speed of the generator at this time? (Ans. 319.4 rad/s) (d)

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