A fault occurring at the terminals of an unloaded synchronous generator operating at its rated voltage has resulted in the following values of currents and voltages. IR0 = j 2.37 pu IR1 = -j 3.05 pu IR2 = j 0.68 pu VR0 = VR1 = VR2 = 0.237 pu. Which of the following faults has occurred?

Power Systems
A fault occurring at the terminals of an unloaded synchronous generator operating at its rated voltage has resulted in the following values of currents and voltages. IR0 = j 2.37 pu IR1 = -j 3.05 pu IR2 = j 0.68 pu VR0 = VR1 = VR2 = 0.237 pu. Which of the following faults has occurred?

LLL

LL

LG

LLG

LLL

LL

LG

LLG

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Power Systems
Plug setting of a relay can be altered by varying

no. of ampere-turns.

none of these.

adjustable back up stop.

air gap of magnetic path.

no. of ampere-turns.

none of these.

adjustable back up stop.

air gap of magnetic path.

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Power Systems
A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

√(1 + Kcsh)/Zs

Zs*√(1 + Kcsh)

Zs/√(1 + Kcsh)

All of these

√(1 + Kcsh)/Zs

Zs*√(1 + Kcsh)

Zs/√(1 + Kcsh)

All of these

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Power Systems
A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator?

0.001

0.1

10

1000

0.001

0.1

10

1000

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Power Systems
If the inertia constant H = 8 MJ/MVA for a 50 MVA generator, the stored energy is

400 MJ

50 MJ

8 MJ

200 MJ

400 MJ

50 MJ

8 MJ

200 MJ

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Power Systems
Which of the following statement is/are true?Zn

both 1 and 2

The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit

The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit

nether 1 nor 2

both 1 and 2

The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit

The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit

nether 1 nor 2

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Power Systems

Power Systems Plug setting of a relay can be altered by varying

Power Systems A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

Power Systems A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator?

Power Systems If the inertia constant H = 8 MJ/MVA for a 50 MVA generator, the stored energy is

Power Systems Which of the following statement is/are true?Zn

Power Systems
Plug setting of a relay can be altered by varying

Power Systems
A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

Power Systems
A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator?

Power Systems
If the inertia constant H = 8 MJ/MVA for a 50 MVA generator, the stored energy is

Power Systems
Which of the following statement is/are true?Zn