Power Systems T...

A 50 Hz four pole alternator rated 100 MVA, 11 kV has an inertia constant of 5 MJ/MVA. Calculate the stored KE in rotor at synchronous speed is in MJ ______. [System stability]

Reactive power compensation is applied at the midpoint of an EHV line of total reactance 0.2 pu to maintain the voltage there at 0.98 pu. The voltage at both ends of the line is 1∠0° pu. The steady-state power transfer limit, in pu is _______.

A 50 Hz generator having H = 6 MJ/MVA is connected to the synchronous motor having H = 4 MJ/MVA through a network of reactances. The generator is delivering power of 1.0 pu to the motor which reduces to 0.6 pu when the fault occurs. The angular acceleration in elec-degrees/sec² is ______

A 3-ϕ generator delivers 1.0 pu power to an infinite bus through a transmission network when a fault occurs. The maximum power which can be transferred during pre-fault, during fault and post fault condition is 1.75 pu, 0.4 pu, and 1.25 pu. The critical clearing angle is ______ degrees.

A round rotor generator with internal voltage E₁ = 2.0 p.u. and X = 1.1 p.u. is connected to a round rotor synchronous motor with internal voltage E₂ = 1.3 p.u. and X = 1.2 p.u. The reactance of the line connecting the generator to the motor is 0.5 p.u. When the generator supplies 0.5 p.u. power, the rotor angle difference between the machines will be

A 100 MVA generator operates on full-load of 50 Hz frequency. The load is suddenly reduced to 50 MW. The steam valve begins to close only after 0.4 s and if the value of the inertia constant H is 5 s, then the frequency at 0.4 s is nearly

The sending end and receiving end voltage of a transmission line are 220 kV. The line is delivering a load 200 MW. The per phase line impedance is (2 + j2) Ω. The maximum steady state power that can be transmitted over the line is_______(in MW)

A synchronous generator is connected to infinite bus through a loss – less line. It is delivering initially 0.5 pu power to infinite bus. The infinite bus voltage is 1.0. the maximum power transfer before fault is 1.0 pu. The inertia constant is 6 MJ/MVA. the critical clearing angle is 75°, then the critical clear time is _______(in sec)