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Figure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and the motors

Figure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and the motors

Introductory Circuit Analysis (13th Edition)
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...
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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 1, bus 2, or bus 3.( Only one bus location) And give this answer For a symmetrical three phase fault on the bus 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. (4) Calculate the fault current contribution from the generator connected to the bus for fault calculation.
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 200 MVA 150 MVA G2 20kV Bus- 2 13.8 kV G1 X=17% 200 MVA X = 20% 250 MVA 240Υ / 20Δ kV' T2 T1 m 13.8A/240Y kV X =10% Bus- 3 X=11% Bus - 1 j 40 2 Linel 50 N 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 11kV 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. (iv) Calculate the fault current contribution from the generator connected to the bus on which you have selected for fault calculation.
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 200 MVA 150 MVA G2 20kV Bus- 2 13.8 kV G1 X=17% 200 MVA X = 20% 250 MVA 240Υ / 20Δ kV' T2 T1 m 13.8A/240Y kV X =10% Bus- 3 X=11% Bus - 1 j 40 2 Linel 50 N 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 11kV 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. (iv) Calculate the fault current contribution from the generator connected to the bus on which you have selected for fault calculation.
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