Figure 1 shows a generating station feeding power to a system. This line is 200 km long.What is the total fault current when the system experiences three-phase symmetrical fault at the receiving end of the bus? Usethese base values: 126 MVA, 19 kV at the generator side, and 149 kV for the feeder sideGenerator 1 ratings:126 MVA, 19 kV, jo.19Generator 2 ratings:90 MVA, 19 kV, jo.12Transformer 1 ratings:126 MVA, 19/149 kV, jo.1Transformer 2 ratings:90 MVA, 19/149 kV, jo.09Transmission line 1 rating:0.2 ohm per phase per kmTransmission line 2 rating:0.7 ohm per phase per km ...T1XLT(GIXL2TzG23

Answered: Image /qna-images/answer/2c8690ca-03a1-46cb-840c-b204db9a1633.jpg

Answered: Figure 1 shows a generating station…

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter7: Symmetrical Faults

Section: Chapter Questions

Problem 7.7P

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Equipment ratings for the five-bus power system shown in Figure 7.15 are as follows: Generator G1:Â Â Â Â 50Â MVA,Â 12kV,Â X=0.2 per unit Generator G2: 100Â MVA, 15 kV, X=0.2 per unit Transformer T1: 50 MVA, 10 kV Y/138kVY,X=0.10 per unit Transformer T2: 100 MVA, 15 kV /138kVY,X=0.10 per unit Each 138-kV line: X1=40 A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV. Prefault load current is neglected. (a) Draw the positive-sequence reactance diagram in unit on a 100-MVA, 15-kV base in the zone of generator G2. Determine (b) the ThĂ©venin equivalent at the fault, (c) the subtransient fault current in per unit and in kA rms, and (d) contributions to the fault from generator G2 and from transformer T2.
Equipment ratings for the four-bus power system shown in Figure 7.14 are as follows: Generator G1: 500 MVA, 13.8 kV, X=0.20 per unit Generator G2: 750 MVA, 18 kV, X=0.18 per unit Generator G3: 1000 MVA, 20 kV, X=0.17 per unit Transformer T1: 500 MVA, 13.8/500YkV,X=0.12 per unit Transformer T2: 750 MVA, 18/500YkV,X=0.10 per unit Transformer T3: 1000Â MVA, 20/500YkV,X=0.10 per unit A three-phase short circuit occurs at bus 1, where the prefault voltage is 525 kV. Prefault load current is neglected. Draw the positive-sequence reactance diagram in per unit on a 1000-MVA, 20-kV base in the zone of generator G3. Determine (a) the ThĂ©venin reactance in per unit at the fault, (b) the subtransient fault current in per unit and in kA rms, and (c) contributions to the fault current from generator G1 and from line 1-2.
Consider the single-line diagram of a power system shown below. The transient reactance of cach part of the system is as shown in table and expressed in p.u. on a common 100 MVA base. A three-phase fault with impedance of 0.16 p. occurs at bus (5). Determine short- circuit capacity (fault level) and short circuit current? Assume the fault voltage at bus (5) equal 112 KV
Find the fault current in both generators and in the motor for a three-phase mid-line fault. Find stresses at nodes 1 and 2 during failure. Use the bus impedance matrix method Note: votage is 10000V
For the radial power system shown in Figure 3, calculate the line-to-ground fault current flowing in each of the circuit breakers for faults at bus 1, bus 2 and bus 3. Also determine the corresponding faulted phase voltage, assuming that the generator is ideal, with a terminal voltage of 1.0 pu. *positive sequence impedance = negative sequence impedance

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