Question

3. (30) A simple power system, shown below, is made up of a synchronous generatcr connected to a synchronous motor through a couple of transformers and a transmission line. The reactances of the different elements of the system are all given in pu as: Xsg-0.5 X of each transformer-10 % Xsm-0.5 X transmission line 0.3 The synchronous motor is connected to an infinite bus Hint: The great advantage of an infinite bus is that it always remains constant and our reference. That way, you can analyze the two sides of the infinite bus independently of each other, except for the current that has to be the same on both sides. If the generator is delivering rated load at 0.8 pf lagging, find: ii) The internal voltage of the generator Efg (EA) and the torque angle vi a) The terminal voltage of the generator The real and reactive powers at the generator terminal. The internal voltage ofthe motor Elin CEA) and the torque angle. The real and reactive powers at the motor terminal (infinite bus). Draw two phasor diagrams demonstrating the operating conditions of the motor and generator. Briefly explain your phasor diagrams

Answer 1

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