Q2. The single-line diagram of a simple three-bi is shown in Figure-2. Each generator is repres- behind the sub-transient reactance. All expressed in per unit on a common MVÀ base and shunt capacitances are neglected. The onoroting no lood ot thoir rotod voltogo

Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Q2. The single-line diagram of a simple three-bus power system
is shown in Figure-2. Each generator is represented by an emf
behind the sub-transient reactance. All impedances are
expressed in per unit on a common MVA base. All resistances
and shunt capacitances are neglected. The generators are
operating on no load at their rated voltage with their emfs in
phase. A three-phase fault occurs at bus 3 through a fault
impedance of Zf = j0.19 per unit.
(i) Using Th'evenin's theorem, obtain the impedance to the
point of fault and the fault current in
(ii) Determine the bus voltages
per
unit.
) j0.05
j0.075
j0.75
2
j0.30
j0.45
Figure-2: Single line diagram of the
power system network for Q2
3
Transcribed Image Text:Q2. The single-line diagram of a simple three-bus power system is shown in Figure-2. Each generator is represented by an emf behind the sub-transient reactance. All impedances are expressed in per unit on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. A three-phase fault occurs at bus 3 through a fault impedance of Zf = j0.19 per unit. (i) Using Th'evenin's theorem, obtain the impedance to the point of fault and the fault current in (ii) Determine the bus voltages per unit. ) j0.05 j0.075 j0.75 2 j0.30 j0.45 Figure-2: Single line diagram of the power system network for Q2 3
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