GATE Electrical Engineering (EE) 2015 Shift 1 Solved Paper

A 50 Hz generating unit has H – constant of 2 MJ/MVA. The machine is initially operating in steady-state at synchronous speed and producing 1 pu of real power. The initial value of the rotor angle δ is 5° when a bolted three-phase to ground short circuit fault occurs at the terminal of the generator. Assuming the input mechanical power to remain at 1 pu, the value of δ in degrees, 0.02 second after the fault is_________