The single-line diagram of Figure 2 shows a generator connected through parallel transmission lines to a large system co

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The Single Line Diagram Of Figure 2 Shows A Generator Connected Through Parallel Transmission Lines To A Large System Co 1 (58.17 KiB) Viewed 17 times

The single-line diagram of Figure 2 shows a generator connected through parallel transmission lines to a large system considered as an infinite bus. The machine is delivering 1 per-unit power and both the terminal voltage and the infinite-bus voltage are 1 per-unit. Numbers on the diagram indicate the reactance values on a common system base. The transient reactance of the generator is 0.15 per-unit, and His 3 M/MVA. a) Determine the power angle equation for the given system operating conditions (pre-fault). b) If a three-phase fault (F1) takes place at a point on the transmission line that is far from the left busbar by a distance equal to one third of the total transmission line length, what would be the power angle equation of the system during fault, and what would it be after the fault is cleared by tripping the two circuit breakers on both sides of the faulted line? c) What is the power angle equation of the system during fault if a three-phase fault (F2) takes place right at the busbar? d) What is the critical clearing angle of the system when F2 takes place? X.2015 f system under study in Question 2.