Lighting arresters are used in power system to protect electrical equipment against a. Direct stokes of lightning b. Over-voltages due to indirect lightning stroke c. Power frequency over-voltages d. Over-currents due to lightning

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

A: We are authorized to answer three subparts at a time, since you have not mentioned which part you…

Q: Lightning stroke is most common cause of current impulsive transients in power system. True False

A: Impulsive transients : It is defined as a sudden change in the electrical quantities such as Current…

Q: A 500-MVA 20-kV, 60-Hz synchronous generator with reactances X, = 0.15, X: 0.24; X 1.1 per unit and…

A:

Q: Draw the circuit diagram and explain the operation of power factor improvement by using (i)…

A:

Q: Q5: A generator is connected through a transformer to a synchronous motor. Reduced to the same base,…

A:

Q: For the circuit shown, the normal operating values shown are known. If a symmetrical three-phase…

A: We can redraw the per-phase equivalent circuit as

Q: c) On 24th May 2021, there was a fault that caused wide power outage in Ghana from 7pm to 1am, the…

A: Solution : Factors affecting Transient Stability of generator are 1)Fault clearing time :- The…

Q: Factors in selecting service conductors. Factors in selecting generator

A: (a)There are number of factor sin choosing the service conductors that are mentioned below.

Q: For three phase motor control the type of wire used for control wiring Select one: O 2.5 mm square,…

A: This question is related to Control wire size of the three phase motor.

Q: 8.In a line-by-line failure we can expect Immersive reader A) Currents exist in the ground…

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Q: 9. Which grounding method is typically required of higher-voltage systems? A. Grounding through…

A: In this question,  We need to choose the correct options Which grounding method is typically…

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

A: As per the guidelines of Bartleby we supposed to answer 1st three subparts of the question. For…

Q: Full introduction of Flexible AC transmission System (FACT) devices with illustrations

A: AC transmission System (FACT) devices : AC transmission System (FACT) devices is a system which…

Q: Type of voltage control method which will reduce inductive reactance of the line is O booster…

A: In this question we will define which method reduce inductive reactance of line..

Q: Why oncoming generator’s frequency needs to be slightly higher than running system frequency in case…

A: Whenever the load on the system increases, one generator is insufficient to meet the demands and…

Q: 0 At which places the diesel power stations are finding favor? Why? g) How do voids in the…

A:

Q: What will be the voltage drop and regulation in resistive, inductive, capacitive load with the…

A: What will be the voltage drop and regulation in resistive, inductive, capacitive load with the…

Q: Explain the conditions of parallel connection of alternators and how these conditions are fulfilled.

A: If the value of the power demand is large then, it is not possible to provide the power by using a…

Q: Mention and discuss the uncertainties affecting the power system operation and planning indices.

A: Uncertainty  is associated with the massive power generation of the renewable energy. The renewable…

Q: three phase generator with constant terminal voltages gives the following currents when under fault:…

A: The solution can be achieved as follows.

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A: The voltage across electrical components at the time of switching is called switching over voltage.…

Q: 3. What are the classifications of Core Loss and Copper Loss?

A: Electrical machines can be either generator or motors and transformers. They can be either Ac…

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Q: sub-transient reactance of 8% and G3: 110 MVA, 30 KV, sub transient reactance of 12%. reactance of…

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A: In this question we will write in which feeder voltage fluctuations is there at consumers…

Q: 4. Why do you think this phase change took place.

A: IN THE MODULATION OF DOUBLE SIDEBAND SUPPRESSED CARRIER HAIR WE WILL USE SYNCHRONOUS DETECTOR AS A…

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

A:

Q: The reactance of a generator is given as 0.2 per unit based on the generator's nameplate rating of…

A:

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A: We are authorized to answer three subparts at a time, since you have not mentioned which part you…

Q: External effects causing short circuit include insulation failure due to lightning surges,…

A: The above statement is absolutely correct.

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A: 1.Booster Transformer:-It is used at the end of a power line or at the intermediate position to…

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

A: Base MVA =150MVA Base Kv=13.8kV Xnewpu=Xold×MVAnewMVAold×KvoldKvnew2…

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Q: 7. Which of the following are sometimes installed as an emergency system, legally required standby…

A: In this question,  Choose the correct option Which of the following are sometimes installed as an…

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A: Given s=33-MVAV=44-KVsubtransient reactance=7%=0.07P.U

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A: Note: Here line impedance as well as Z bus matrix impedance are given We are going to solve the…

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A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

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Q: Problem 4: Consider an interconnected 50-Hz power system that contains four turbine-generator units…

A: The solution can be achieved as follows.

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Q: In a 3-phase, 4 wire unbalanced system, the current in neutral wire is 18 A. The magnitude of zero…

A: Given a 3-phase, 4 wire unbalanced system having, The current in neutral wire, IN=18 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.