Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN: 9781305632134
Author: J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher: Cengage Learning
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3.On a double line-to-ground faultImmersive reader
A) The short-circuit currents in the faulted phases are equal.
B) The voltages at the fault point on the faulted phases are zero.
C) The phase not involved in the fault has a zero voltage at the fault point.
D) There are no circulating currents through the neutrals to ground.
E) N. A.
Q.3
When a line-to-ground fault occurs, the
current in faulted phase 'a' is 100A. The
zero-sequence current in phase 'c' is
Q.3
When a line-to-ground fault occurs, the
current in faulted phase 'a' is 100A. The
zero-sequence current in phase 'c' is
r
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- 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.arrow_forwardThe DC Components components initially average about ______ of the fault current. a. 0.50 to 0.60 times b. infinity c. 20 to 45 percentage d. 50 percentagearrow_forwardA three phase fault is applied at the point P as shown in the figure. Find the criticalclearing angle for clearing the fault with simultaneous openings of the breakers 1 and 2. Thegenerator is delivering 1.0 pu at the instant preceding the faultarrow_forward
- The per unit values of positive, negative and zero sequence reactances of a network at fault are 0-08, 0-07 and 0-05 respectively. Determine the fault current if fault is line-to-line-to-ground.arrow_forward1 Xine = j0.30 %3D G M X" = j0.15 X" = j0.20 Xiine = j0.30 Xiine = j0.30 %3D 1. Find the Thévenin equivalent looking into bus 3. 2. Calculate the subtransient fault current for a bolted three-phase fault at bus 3. Pre-fault voltage is VF 1Z°, and pre-fault current is neglected. 3. Distribute the fault current between the motor and generator.arrow_forwardcomplet The equivalent reactance of the double circuit line under post fault condition is................than fault condition.arrow_forward
- Even though the fault current is not symmetrical and not strictly periodic, the rms asymmetrical fault current is computed as the rms ac fault current times an asymmetry factor, which is a function of _______.arrow_forwardFor the system of Problem 9.13, compute the fault current for the following faults at bus 3: (a) a single line-to-ground fault through a fault impedance ZF=j0.1 per unit, (b) a line-to-line fault through a fault impedance ZF=j0.1 per unit, (c) a double line-to-ground fault through a common fault impedance to ground ZF=j0.1 per unit.arrow_forwardi) 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.arrow_forward
- Due to the fault in all the phases at bus -5 the positive sequence fault current of -j1.125 flows to the ground without fault impedance to ground at bus-5. If pre-fault voltage is 1.04 p.u. and the positive sequence impedance at bus-5 is jo.25. As per fault analysis which one of the following values will be the positive sequence voltage at bus 5? Select one: O a. 0.71875 O b. 0.75875 O c. jo.75875 O d. -jo.75875arrow_forwarda) In Three Phase Faults that will occur separately on A, B, C and D Busbars, Calculate the currents. b) Maximum fault currents to pass through KA, KB, KC1, KC and KD Protection devices determine. Help me please... Thank you so much.arrow_forwardApproximately 75 percentage of the fault are either _____ or permanent LG Faults. a. LLG b. Transient c. Simple d. LLarrow_forward
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Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning
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