Q3 In the system shown in figure 3, calculate the fault current and the short circuit MVA. (Assume SB = 50 MVA and VB = 11 kV). 30MVA 15% G₁ FZ 10 MVA 10% -00000 20 N VA 10% G لی ( ۷۶ در ۵۱۶۰) 10 MUA 12% -00000 X2 40 MVA 18% G3 Fig. 3

Q3 In the system shown in figure 3, calculate the fault current and the short circuit MVA. (Assume SB = 50 MVA and VB = 11 kV). 30MVA 15% G₁ FZ 10 MVA 10% -00000 20 N VA 10% G لی ( ۷۶ در ۵۱۶۰) 10 MUA 12% -00000 X2 40 MVA 18% G3 Fig. 3

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter7: Alternating Current, Power Distribution, And Voltage Systems

Section: Chapter Questions

Problem 22RQ

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Concept explainers

Fault Analysis

In an electrical engineering system, a fault is an abnormal electric current flowing through the system, and fault analysis is the study of these faults. For instance, a short-circuit is a fault where the live wire touches the ground or neutral wire. If a circuit is interrupted by a failure of a current-carrying wire then an open circuit fault occurs. The open-circuit faults are also called series faults. One or more phases or ground may be involved in a three-phase fault or may occur only between two phases. Current flows into the earth in case of a ground fault or earth fault. For most situations, the prospective short circuit current of a fault that is predictable can be calculated. To limit the loss of service because of a failure, the protective devices can detect fault conditions and operate circuit breakers and also other devices. All phases equally can be affected in a poly-phase system which is known as symmetric electrical fault. The asymmetric fault becomes more complicated to analyze if only some phases are affected. By using methods such as symmetrical components, the power system analysis of these types of faults is often simplified. The main objective of power system protection is to design, detect, and interrupt power system faults.

Question

Q3 In the system shown in figure 3, calculate the fault current and the short
circuit MVA. (Assume SB = 50 MVA and VB = 11 kV).
30MVA
15%
G₁
FZ
10 MVA
10%
00000
(0.15+)
20NVA
10%
(OMUA
12%
-00000
X2
40 MVA
18%
G₂
Fig. 3

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