Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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What type of fault is three phase to earth fault in power system.(Symmetrical or Unsymmetrical).
Discuss about the chance of occurrence of the above mentioned type of fault.
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- 1. The subscript d in the generator subtransient reactance refers to: 1. Generator impedance 2. If the available fault current slightly exceeds the breaker published 2. Generator 3. Direct axis 4. 1 and 2 reactance interrupting rating, then it is safe to use the breaker. 1. True | 2. False 3. Maybe 3. The rms symmetrical fault current times an asymmetry factor K, is equal to the ac fault current. | 2. False 4. The most common fault on a 3-phase power system is: 1. True 3. Maybe | 2. DLG 3. L-L 1. SLG 5. All rotating and non-rotating load impedances are usually included in a power system fault study 1. True 2. False 3. Мaybearrow_forwardPlease solve Q1(B) ONLY. Q1(A) is for reference.arrow_forwardExplain the concept of a circuit breaker in electrical power systems and its role in protecting against overcurrent faults.arrow_forward
- 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 rarrow_forwardWhich 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 samearrow_forwardFigure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and the motors are as shown in the figure. The reactance of lines 1 and 2 are 40 ohms and 50 ohms respectively. Assume that system is unloaded, and the generators are generating their rated voltage. Select the generator G₁ ratings as base values. Choose the fault location in bus 3. And give the bellow answer For a symmetrical three phase fault on the bus 3 1. Calculate the fault current in ampere and fault power in MVA and the fault current contribution from the generator connected to the bus 3.arrow_forward
- A 50 MVA, 11 KV three-phase alternator was subjected to a different types of faults. The fault current REN Art (1) 1870 A. for three-phase fault. (ii) 2590 A. for L-L fault. *VE ve. -Ve AV19 (iii)4130 A. for L-G fault. The alternator neutral is solidly grounded. Find the three sequence reactance's of the alternator. X., X., X +V., -ve, vearrow_forward13. _______ current attempts to return to the source over any available conductive path.A. DirectB. AlternatingC. Ground-faultD. Arc-faultarrow_forwardDescribe the process of fault current analysis in power systems and its significance in protecting electrical equipment from damage.arrow_forward
- A 3-phase, 33-MVA, 44-kV alternator has a substransient reactance of 7%. A 3-phase short circuit occurs at its terminals. Determine the fault current. Use the alternator rating as base values. Round your answer to 2 decimal places.arrow_forwardIf an unsymmetrical fault occurs on phase C of a transmission line, what would make the fault symmetrical? A. if phase C of the transmission line opens B. If phases A and B become faulted C. If two different faults occur on phas a and barrow_forwardWhat are electrical techniques used for failure analysisarrow_forward
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