Q2:- Two 50 MVA, 11kV synchronous generators are connected to common bus bar which supplies a feeder. The star point on one of the generators is grounded through resistance of 192, while that of the other generator is isolated. A line to ground fault occurs at the far end of the feeder, determine: a) The fault current. b) The line voltages. Generator 1 and 2: X₁ = j 0.2 pu, X₂ = 0.15 pu and Xo = 0.08 pu Feeder: X₁ X₂ = 0.4 0/phase and Xo = = 0.8 /phase Slove on paper

Q2:- Two 50 MVA, 11kV synchronous generators are connected to common bus bar which supplies a feeder. The star point on one of the generators is grounded through resistance of 192, while that of the other generator is isolated. A line to ground fault occurs at the far end of the feeder, determine: a) The fault current. b) The line voltages. Generator 1 and 2: X₁ = j 0.2 pu, X₂ = 0.15 pu and Xo = 0.08 pu Feeder: X₁ X₂ = 0.4 0/phase and Xo = = 0.8 /phase Slove on paper

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

Q-5-) 60 Hz generator supplies 0.50 Pmax power to a busbar with infinite power over a conveying line. When a fault occurs, the reactance value between the generator and the infinite bus becomes 400% times the value before the fault. When the fault is isolated, the maximum power that can be transferred generator to the endless bus is 75% of the original (initial) maximum value. Accordingly, using t area criterion method, calculate the critical clearance angle of the system. 00
13. A generator rated 30 MVA, 11 kV has a direct-axis subtransient reactance of 0.3 p.u. the negative and zero sequence reactances are 0.45 and 0.15 p.u. respectively. The neutral is solidly grounded. Determine the subtransient current in the generator when a line to ground fault occurs at the terminals of the generator with the generator running on no load at rated voltage. Ignore resistance. (
Q2:- Two 50 MVA, 11kV synchronous generators are connected to common bus bar which supplies a feeder. The star point on one of the generators is grounded through resistance of 192, while that of the other generator is isolated. A line to ground fault occurs at the far end of the feeder, determine: a) The fault current. b) The line voltages. Generator 1 and 2: X₁ = j 0.2 pu, X₂ = 0.15 pu and Xo = 0.08 pu Feeder: X₁ X₂ = 0.4 0/phase and X₁ = 0.8 n/phase
02. The 3-p generator is rated 20 MVA, 13.8 kV. The positive, negative & zero sequence reactances are respectively 0.25, 0.35 & 0.10 pu. The neutral of generator is grounded with reactance of 0.15 pu. Determine the sub-transient current & line to line voltages of the generator when a grievous fault occurs among the unsymmetrical faults at the generator terminals with the generator operating unloaded at rated voltage. Consider generator armature resistance is 0.2 Ω.
Description In the particular case of figure below derive both the critical clearing angle and the critical clearing time. P, = Pmaz sin d Pm A1 do der Smar A generator having H = 6.R MJ/MVA is delivering power of 1.0 per unit to an infinite bus through a purely reactive network when the occurrence of a fault reduces the generator output power to zero. The maximum power that could be delivered is 2.5S per unit. When the fault is cleared, the original network conditions again exist. Determine the critical clearing angle and critical clearing time. (Roll=PQRS)
Q2:- Two 50 MVA, 11kV synchronous generators are connected to common bus bar which supplies a feeder. The star point on one of the generators is grounded through resistance of 192, while that of the other generator is isolated. A line to ground fault occurs at the far end of the feeder, determine: a) The fault current. b) The line voltages. Slove in paper Generator 1 and 2: X₁ = j 0.2 pu, X₂ = 0.15 pu and Xo = 0.08 pu Feeder: X₁ X₂ = = 0.4 2/phase and Xo = 0.8 2/phase
Let the system of Figure 1 operating with mechanical input Pm at a steady angle ôo. A three phase fault occurs at the outgoing radial line and hereby the fault is cleared by opening the circuit breaker. Now, find the effect of clearing time on transient stability. Breaker Generator G XL Transformer Fault Pm
For the circuit shown, if a symmetrical three-phase fault occurs in node 2, determinea. The short-circuit current in all three phases. b. The voltage at node 1 during the fault.c. The current in generator 1 during the fault. Neglect the prefault currents and consider the reference voltage of the system at 10√3 ??.
estion 9 The fault current level of a circuit breaker used in a transmission line with phase voltage 2.2 kV and breaking capacity 50 MVA is yet ......kA. vered -ked out of Flag question estion 10 The voltage between lines in a transmission line is the maximum value of the sine waveform. yet vered Select one: -ked out of O True Flag question O False
QUESTION #2: A 50 MVA, 11 kV, 3 phase alternator has a direct subtransient reactances of 0.1 pu. The negative and zero sequences reactances are 0.15 and 0.25 pu respectively. The neutral of the generator is solidly earthed. Determine the subtransient current in the generator and the line to line voltages for subtransient conditions when a single line to ground fault occurs at the generator terminals with the generator operating unloaded at rated voltage.
A generator rated 100 MVA, 20 kV has X1=X2=20% and X0 =5% Its neutral is grounded through reactor of 0.32 ohms. The generator is operating at rated voltage with load and is disconnected from the system when a single line to ground fault occurs at its terminals. Find the subtransient current in the faulted phase and line to line voltage.
The severity of line-to-ground and 3-phase faults at the terminals of an unloaded star connected synchronous generator is to be same. If the terminal voltage is 1 p.u. and X, = X2 = j0.35 p.u., Xgo = j0.05 p.u., for the alternator, then the required inductive reactance for neutral grounding is (a) X = j0.1 p.u. (b) Xn =j0.015 p.u. (c) Xạ =j0.15 p.u (d) Xn =j02 p.u.