Which of the following correctly orders how frequently each type of fault occurs?- a. balanced three-phase. single line to ground, Line to line , double line to ground, b. single line to ground, Line to line , double line to ground, balanced three-phase c. All the same

Which of the following correctly orders how frequently each type of fault occurs?- a. balanced three-phase. single line to ground, Line to line , double line to ground, b. single line to ground, Line to line , double line to ground, balanced three-phase c. All the same

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 9.19P

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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

Which of the following correctly orders how frequently each type of fault occurs?-

a. balanced three-phase. single line to ground, Line to line , double line to ground,

b. single line to ground, Line to line , double line to ground, balanced three-phase

c. All the same

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5.The most frequently occurring fault in electrical power systems is Immersive reader. A) Symmetrical three-phase fault B) Line to ground fault C) Line to Line Fault D) Double Line to Ground Fault E) N. A.
7.In a line-to-ground fault we can expect that A) There are no currents to ground. B) The voltages at the fault point with respect to ground are zero in all three phases. C) The current in the faulted phase flows to ground. D) There are short circuit currents in all three phases. E) N. A.
FROM THE DIAGRAM ATTACHED SOLVE FOR i) An equation for the fault current when a single-line-to-ground fault occurs. ii) An equation for the fault current when a line-to-line fault occurs. iii) An equation for the fault current when a line-to-line-to-earth fault occurs.
answer both i will rate.... a. In sequence networks of power system, why does voltage sources appear only in the positive sequence? b. Describe the main differences in fault protection objectives when dealing with a temporary fault vs a permanent fault.
d) Discuss the procedure for computation of fault current in power system when a double line to ground fault occurs. OR
What type of fault is Single phase to ground fault in power system.(Symmetrical or Unsymmetrical). Discuss the chance of occurrence of the above-mentioned type of fault.
1. component of current equal to zero. The nature of fault is a.Three phase fault b.Double line to ground fault c.Single line to ground fault d.Line to line fault 2.if all the three sequence currents at the fault point in a power system are equal, then the type of the fault is a.Line to line fault b.Three phase fault c.Double line to ground fault d.Single line to ground fault 3- Voltage at Slack bus a. Remains same in all the iterations b. Varies in each iteration c. Changes in each iteration d. Will not remain constant 4-The information cannot be obtained from power flow study is a.Fault voltage at slack bus b.fault current at generator buses c.Phase angles of load bus voltages d.Stability of generator i uploded the houndots (book )here :https://seomidea.com/hct/nu.pdf
b) A fault occurs at bus 3 of the network shown in Figure Q4. Pre-fault nodal voltages throughout the network are of 1 p.u. and the impedance of the electric arc is neglected. Sequence impedance parameters of the generator, transmission lines, transformer and load are given in Figure Q4. V₁ = 120° p.u. V₂ = 120° p.u. V₂ = 1/0° p.u. V₂= 120° p.u. jXj0.1 p.u. JX2) 0.1 p.u. jX0j0.15 p.u. jXn-j0.2 p.u. 1 JX(2)-j0.2 p.u. 2 jX)=j0.25 p.u. JX20-10.15 p.u. jXa(z)-j0.2 p.u. 4 jX2(0)=j0.2 p.u. jXT(1) j0.1 p.u. jXT(2)=j0.15 p.u. jXT(0)=j0.1 p.u. Figure Q4. Circuit for problem 4b). = jXj0.1 p.u. j0.1 p.u. - JX(2) JXL(0) 10.1 p.u. = (i) Assuming a balanced excitation, draw the positive, negative and zero sequence Thévenin equivalent circuits as seen from bus 3. (ii) Determine the positive sequence fault current for the case when a three- phase-to-ground fault occurs at bus 3 of the network. (iii) Determine the short-circuit fault current for the case when a one-phase- to-ground fault occurs at bus…
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Explain the concept of fault analysis in power systems. What are the different types of faults, and how are they analyzed and mitigated?
An equation for the fault current when a line-to-line fault occurs , An equation for the fault current when a line-to-line-to-earth fault occurs
Discuss the concept of fault analysis in power systems. What are the types of faults and their effects?