3. A 60 Hz generator having inertia constant H-5 MJ/MVA and a direct axis transient reactance X'=0.3 per unit is connect

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3 A 60 Hz Generator Having Inertia Constant H 5 Mj Mva And A Direct Axis Transient Reactance X 0 3 Per Unit Is Connect 1 (34.82 KiB) Viewed 32 times

3. A 60 Hz generator having inertia constant H-5 MJ/MVA and a direct axis transient reactance X'=0.3 per unit is connected to infinite bus through a transformer and 2 parallel transmission lines as depicted in Figure 9. The generator is delivering active power of 0.8 per unit and reactive power of 0.074 per unit when a temporary three phase fault occurs at Bus 1. When the fault is cleared, all lines are intact. X'=0.3 p.u. X,-0.2 p.u. Bus 1 Xu=0.3 p.u. XL-0.3 p.u. Figure 9. V=1.0 p.u. Bus 2 a) Draw an equivalent circuit of the system. b) Calculate the internal voltage of the generator. c) Formulate power angle equation and draw power angle curve. d) Determine the critical clearing angle 8c and critical clearing time 2H(8-8) NoP 8 (4 marks) (4 marks) (6 marks) (6 marks)