A 50 Hz synchronous generator having inertia constant H=5 and transient reactance Xd 1 = 0.3 p.u is connected

A 50 Hz synchronous generator having inertia constant H=5 and transient reactance Xd 1 = 0.3 p.u is connected an infinite bus through a transformer and double circuit line. The network is purely reactive. The synchronous generator is delivering a real power P=0.8 p.u and reactive power Q=0.6 p.u to the infinite bus of 1.0 p.u in steady state. Draw the power angle curve when system is healthy, fault occurs in the starting end of the transmission line and after clearing the fault at one line is opened.


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