Question 2: A single-line diagram of the power system is shown in Figure 2, where negative- and zero-sequence reactances are also given. (a) Draw the per-unit zero-, positive-, and negative sequence networks. (b) For a fault at bus 7 find the sequence Thevenin equivalents. (c) Calculate the fault current in per-unit for a bolted double line-to-ground short circuit to ground at bus 7. Prefault load current and D-Y transformer phase shift are neglected. (d) Calculate the per-unit line-to-ground voltages at faulted bus 7 and bus 6 during the fault in C.

Q: fault location

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Q: the fault current for a

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A:

Q: b) A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout…

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Q: V, =1.025Z0°pu P=300MW j0.05 Bus 1 Bus 3 V = 1.03 Slack j0.025 j0.025 Bus 2 400MW 200MVAR

A: The given power system can be redrawn as shown below:

Q: Consider the single-line diagram of a power system shown below. The transient reactance of cach part…

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A:

Q: Q1a Voltage control – fault level • A load bus (bus-L) is suppling from two different buses A & B…

A:

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.