Figure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and the motors are as shown in the figure. The reactance of lines 1 and 2 are 40 ohms and 50 ohms respectively. Assume that system is unloaded, and the generators are generating their rated voltage. Select the generator G₁ ratings as base values. Choose the fault location in bus 3. And give the bellow answer For a symmetrical three phase fault on the bus 3 1.Draw the reactance diagram for the fault with all the reactances marked in per unit. 2.Determine the Thevenin's equivalent circuit which can be used to calculate the fault current. (3) Calculate the fault current in ampere and fault power in MVA and the fault current contribution from the generator connected to the bus 3.
Figure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and the motors are as shown in the figure. The reactance of lines 1 and 2 are 40 ohms and 50 ohms respectively. Assume that system is unloaded, and the generators are generating their rated voltage. Select the generator G₁ ratings as base values. Choose the fault location in bus 3. And give the bellow answer For a symmetrical three phase fault on the bus 3 1.Draw the reactance diagram for the fault with all the reactances marked in per unit. 2.Determine the Thevenin's equivalent circuit which can be used to calculate the fault current. (3) Calculate the fault current in ampere and fault power in MVA and the fault current contribution from the generator connected to the bus 3.
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
Chapter9: Unsymmetrical Faults
Section: Chapter Questions
Problem 9.13P: Consider the oneline diagram of a simple power system shown in Figure 9.20. System data in per-unit...
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Question
Figure 2 shows the circuit of a simple power system. The ratings of the generators,
transformers and the motors are as shown in the figure. The reactance of lines 1 and 2
are 40 ohms and 50 ohms respectively. Assume that system is unloaded, and the generators
are generating their rated voltage. Select the generator G₁ ratings as base values.
Choose the fault location in bus 3.
And give the bellow answer
For a symmetrical three phase fault on the bus 3
1.Draw the reactance diagram for the fault with all the reactances marked in per unit.
2.Determine the Thevenin's equivalent circuit which can be used to calculate the fault current.
(3) Calculate the fault current in ampere and fault power in MVA and the fault current contribution from the generator connected to the bus 3.
![Figure 2 shows the circuit of a simple power system. The ratings of the generators,
transformers and the motors are as shown in the figure. The reactance of lines 1 and 2
are 40 Q and 50 2 respectively. Assume that system is unloaded, and the generators
are generating their rated voltage. Select the generator G, ratings as base values.
Choose the fault location
bus 3
200 MVA
150 MVA
20KV
G1
Bus- 2
13.8kV
X =17%
200 MVA
X = 20%
250 MVA
T2
240Y / 20Δ k
X =10%
T1 m 13.8A/240Y kV
Bus-3
X=11%
Bus - 1
j 40 2
Linel
50 2
Line2
50 MVA
m T,
120 MVA
T3
240 A/11Y kV
240 Y /18A kV
X = 10%
X = 10%
120 MVA
50 MVA
G3
M
18KV
11 kV
X=19%
X= 20%
Figure 2
For a symmetrical three phase fault on the bus
(i)
Draw the reactance diagram for the fault with all the reactances marked in
per unit.
(ii)
Determine the Thevenin's equivalent circuit which can be used to calculate
the fault current.
(ii)
Calculate the fault current in ampere and fault power in MVA.
Calculate the fault current contribution from the generator connected to the
bus on which you have selected for fault calculation.
(iv)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F46af058d-be1f-4432-92f6-bec5aa95c85e%2F4eb45b62-ddb6-499c-ac48-a0219f5caf8e%2F95eiit4_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Figure 2 shows the circuit of a simple power system. The ratings of the generators,
transformers and the motors are as shown in the figure. The reactance of lines 1 and 2
are 40 Q and 50 2 respectively. Assume that system is unloaded, and the generators
are generating their rated voltage. Select the generator G, ratings as base values.
Choose the fault location
bus 3
200 MVA
150 MVA
20KV
G1
Bus- 2
13.8kV
X =17%
200 MVA
X = 20%
250 MVA
T2
240Y / 20Δ k
X =10%
T1 m 13.8A/240Y kV
Bus-3
X=11%
Bus - 1
j 40 2
Linel
50 2
Line2
50 MVA
m T,
120 MVA
T3
240 A/11Y kV
240 Y /18A kV
X = 10%
X = 10%
120 MVA
50 MVA
G3
M
18KV
11 kV
X=19%
X= 20%
Figure 2
For a symmetrical three phase fault on the bus
(i)
Draw the reactance diagram for the fault with all the reactances marked in
per unit.
(ii)
Determine the Thevenin's equivalent circuit which can be used to calculate
the fault current.
(ii)
Calculate the fault current in ampere and fault power in MVA.
Calculate the fault current contribution from the generator connected to the
bus on which you have selected for fault calculation.
(iv)
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