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POWER SYSTEMS

Power Systems
Isolator in sub station is open under ------------- condition?

 any of the above
 full load
 short circuit
 no load

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Power Systems
Earthing switch is used for

 protection of equipment from ground faults
 discharging residual energies
 measuring of safety voltage
All of these

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Power Systems
To protect the power transformer ( Y-Y with neutral grounded) against fault, which type of connection do the current transformers have?

 Y-Y connection
 Δ-Y connection
 Δ-Δ connection
 Y-Δ connection

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Power Systems
Which type of connection is employed for current transformers for the protection of star- delta connected 3-phase transformer?

 delta-star
 delta-delta
 star-star
 star-delta

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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?

 30.28 kV
 31.28 kV
 28.28 kV
 29.28 kV

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