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Power Systems

Power Systems
If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400 : 5, then plug setting multiplier will be

 15.
 25.
 50.
 10.

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Power Systems
Maximum power transfer capability of transmission line can be increased by

All of these
 Using series capacitance
 Using bundled conductors
 Parallel transmission lines

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Power Systems
String efficiency depends upon

 voltage rating of whole string.
 voltage rating of one SCR.
 no. of SCR in the string.
  all of these.

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Power Systems
A 10 MVA generator has reactance of 0.2 pu. Find the new reactance value for 50 MVA base?

 0.2 pu
 0.25 pu
 5 pu
 1 pu

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Power Systems
The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

 125 electrical degrees/s²
 225 electrical degrees/s²
 22.5 electrical degrees/s²
 12.5 electrical degrees/s²

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Power Systems
A 50 Hz, 17.32 kV generator is connected to a power system. The system reactance and capacitance per phase are 10 mH and 0.2 mF respectively. What is the maximum voltage across the contacts of the circuit breaker at an instant when it passes through zero?

 28.28 kV
 31.28 kV
 30.28 kV
 29.28 kV

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