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Q#1 Power System Stability GATE EE 2017 NAT +2 marks -0 marks

The figure shows the single line diagram of a power system with a double circuit transmission line. The expression for electrical power is 1.5 sin , where  is the rotor angle. The system is operating at the stable equilibrium point with mechanical power equal to 1 pu. If one of the transmission line circuits is removed, the maximum value of , as the rotor swings, is 1.221 radian. If the expression for electrical power with one transmission line circuit removed is , the value of , in pu is ____________. (Give the answer up to three decimal places)

D:\GATE 2017 FInal Files\EE 2017\EE 2017- Session 1 Diagram\Q 55..JPG

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