A lossless transmission line with 0.2 pu reactance per phase uniformly distributed along the length of the line, connecting a generator bus to a load bus, is protected up to 80 % of its length by a distance relay placed at the generator bus. The generator terminal voltage is 1 pu. There is no generation at the load bus. The threshold pu current for operation of the distance relay for a solid three phase-to-ground fault on the transmission line is closest to:

A lossless transmission line with 0.2 pu reactance per phase uniformly

1.	A lossless transmission line with 0.2 pu reactance per phase uniformly distributed along the length of the line, connecting a generator bus to a load bus, is protected up to 80 % of its length by a distance relay placed at the generator bus. The generator terminal voltage is 1 pu. There is no generation at the load bus. The threshold pu current for operation of the distance relay for a solid three phase-to-ground fault on the transmission line is closest to:
A.	1
B.	3.61
C.	5
D.	6.25
Answer» E.

Discussion

No Comment Found

Related MCQs

Five alternators, each of which is rated for 10 MVA, 11 KV with 25% reactance, operate in parallel order. What will be the short circuit level in the bus bar?
For a fault at the terminals of the synchronous generator, the fault current is maximum for a
A 50 Hz, 4 Pole, 500 MVA, 22 kV turbo generator is delivering rated MVA at a power factor of 0.8. Suddenly a fault occurs reducing the electric power output by 40%. Neglect the losses and assume constant power input to the shaft. The accelerating torque in the generator at the time of fault is
A lossless transmission line with 0.2 pu reactance per phase uniformly distributed along the length of the line, connecting a generator bus to a load bus, is protected up to 80 % of its length by a distance relay placed at the generator bus. The generator terminal voltage is 1 pu. There is no generation at the load bus. The threshold pu current for operation of the distance relay for a solid three phase-to-ground fault on the transmission line is closest to:
Line-to-ground fault occurs:
In case of single line to ground fault
A sustained three phase fault occurs in the power system shown in the figure. The current and voltage phasors during the fault (on a common reference), after the natural transients have died down, are also shown. Where is the fault located?
At the terminal of a 3ϕ, 6.6 kV, 10 MVA alternator, a load R = 200 Ω is connected between two phases, and other phase is kept open. The sequence impedance of the alternator is Z1 = Z2 = j 5Ω and Z0 = j2Ω. What is the current through the load resistance?

Discussion

No Comment Found

Related MCQs

Reply to Comment