Phase a of a three-phase 4.16 kV ungrounded system is solidly grounded. For this fault, calculate the magnitude of the positive-, negative-, and zero-sequence volt- ages at the fault. Explain your answers with reference to the sequence networks and interconnections used to calculate line-to-ground faults on three-phase systems.

Phase a of a three-phase 4.16 kV ungrounded system is solidly grounded. For this fault, calculate the magnitude of the positive-, negative-, and zero-sequence volt- ages at the fault. Explain your answers with reference to the sequence networks and interconnections used to calculate line-to-ground faults on three-phase systems.

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 9.6MCQ

See similar textbooks

Similar questions

A three-phase circuit breaker has a 15.5-kV rated maximum voltage, 9.0-kA rated short-circuit current, and a 2.50-rated voltage range factor. (a) Determine the symmetrical interrupting capability at 10-kV and 5-kV operating voltages. (b) Can this breaker be safely installed at a three-phase bus where the symmetrical fault current is 10 kA, the operating voltage is 13.8 k V, and the (X/R) ratio is 12?
i) An equation for the fault current when a single-line-to-ground fault occurs ii) derive an equation for voltage under a single-line-to- ground fault condition.
Describe the concept of fault current analysis in power systems and its role in protecting electrical equipment.
Thévenin equivalent sequence networks looking into the faulted bus of a power system are given with ?1=?0.15 , ?2=?0.15 , ?0=?0.2and ?1=1∠0°per unit. Compute the fault currents and voltages for the followingfaults occurring at the faulted bus: (a) Balanced three-phase fault (b) Single line-to-ground fault (c) Line-line fault (d) Double line-to-ground fault Which is the worst fault from the viewpoint of the fault current?
Derive an expression for fault current for single line-to-ground fault by symmetrical components method.Derive an expression for fault current for line-to-line fault by symmetrical components method.Derive an expression for fault current for doube line-to-ground fault by symmetrical components method.
A 3-phase, 13.8 kV, 10 MVA alternator has positive,negative and zero sequence reactances of 0.20, 0.020 and0.10 pu. Determine the fault current if a double line toground fault occurs.
circuit diagram for electrical fault detector system for a three-phase transmission line
For the circuit shown, if a symmetrical three-phase fault occurs in node 2, determinea. The short-circuit current in all three phases. b. The voltage at node 1 during the fault.c. The current in generator 1 during the fault. Neglect the prefault currents and consider the reference voltage of the system at 10√3 ??.
For the radial power system shown in Figure 3, calculate the line-to-ground fault current flowing in each of the circuit breakers for faults at bus 1, bus 2 and bus 3. Also determine the corresponding faulted phase voltage, assuming that the generator is ideal, with a terminal voltage of 1.0 pu. *positive sequence impedance = negative sequence impedance
What is the significance of sub-transient reactance in the short circuit studies and what relation the maximum momentary short circuit current have with initial fault current?