The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

88.2%

11.8%

15%

85%

88.2%

11.8%

15%

85%

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Power Systems
In kaplan runner, the number of blades is generally of the order of

3 - 6.

12 - 16.

1 - 2.

16 - 24.

3 - 6.

12 - 16.

1 - 2.

16 - 24.

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Power Systems
For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to

V2.

V.

1 / V.

1 / V2.

V2.

V.

1 / V.

1 / V2.

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Power Systems
A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time?

0.56

-0.92

0.92

-0.56

0.56

-0.92

0.92

-0.56

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

9.936 pu

8.936 pu

7.936 pu

10.936 pu

9.936 pu

8.936 pu

7.936 pu

10.936 pu

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Power Systems
For n bus power system size of Y bus matrix is

(n-2)×(n-2)

(n-1)×(n-2)

(n-1)×(n-1)

n×n

(n-2)×(n-2)

(n-1)×(n-2)

(n-1)×(n-1)

n×n

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Power Systems

Power Systems The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

Power Systems In kaplan runner, the number of blades is generally of the order of

Power Systems For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to

Power Systems A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time?

Power Systems The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

Power Systems For n bus power system size of Y bus matrix is

Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

Power Systems
In kaplan runner, the number of blades is generally of the order of

Power Systems
For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to

Power Systems
A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time?

Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

Power Systems
For n bus power system size of Y bus matrix is