Gate EE-2015-1 Question Paper With Solutions

Q.64.A 50 Hz generating unit hasH-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 angleδis5c, 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 ofδin degrees, 0.02 second after the fault is______