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b) A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the network are of 1 + j0 p.u, and the impedance of the electric arc is neglected (Zf = 0 + j0 p.u.). The positive, negative and zero sequence impedance parameters of the generator, transmission lines and transformer are given in Figure Q3.   (i) Determine the positive sequence fault current for the case when a three-phase-to-ground fault occurs at bus 4 of the network   (ii) Determine the short-circuit fault current for the case when a one-phase- to-ground fault occurs at bus 4. Recall that phasors can be expressed in terms of their symmetrical components as shown in the picture attached. where F stands for any three-phase quantity (e.g., current, voltage)   (iii) Determine the short-circuit fault current for the case when a phase-to-phase fault occurs at bus 4

b) A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the network are of 1 + j0 p.u, and the impedance of the electric arc is neglected (Zf = 0 + j0 p.u.). The positive, negative and zero sequence impedance parameters of the generator, transmission lines and transformer are given in Figure Q3.   (i) Determine the positive sequence fault current for the case when a three-phase-to-ground fault occurs at bus 4 of the network   (ii) Determine the short-circuit fault current for the case when a one-phase- to-ground fault occurs at bus 4. Recall that phasors can be expressed in terms of their symmetrical components as shown in the picture attached. where F stands for any three-phase quantity (e.g., current, voltage)   (iii) Determine the short-circuit fault current for the case when a phase-to-phase fault occurs at bus 4

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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b) A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the network are of 1 + j0 p.u, and the impedance of the electric arc is neglected (Zf = 0 + j0 p.u.). The positive, negative and zero
sequence impedance parameters of the generator, transmission lines and transformer are given in Figure Q3.
 
(i) Determine the positive sequence fault current for the case when a three-phase-to-ground fault occurs at bus 4 of the network
 
(ii) Determine the short-circuit fault current for the case when a one-phase- to-ground fault occurs at bus 4. Recall that phasors can be expressed in terms of their symmetrical components as shown in the picture attached. where F stands for any three-phase quantity (e.g., current, voltage)
 
(iii) Determine the short-circuit fault current for the case when a phase-to-phase fault occurs at bus 4
 
 
 
 
 
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V₁ = 120° p.u. jXan)= j0.1 p.u. jX(2) j0.15 p.u. jXdo) = j0.2 p.u. = V₂= = 120° p.u. V3= 120° p.u. V₁ = 120° p.u. jX1(1) = j0.15 p.u. jX2(1) = j0.2 p.u. 1 jx(2) j0.15 p.u. 2 A 3 X2(2) 10.2 p.u. 4 jX11(0) = j0.2 p.u. jX(2(0) = j0.25 p.u. jXT(1) = j0.15 p.u. jXT(2) = j0.15 p.u. jXT(0) = j0.15 p.u. Figure Q3. Circuit for problem 3b). 0
Transcribed Image Text:V₁ = 120° p.u. jXan)= j0.1 p.u. jX(2) j0.15 p.u. jXdo) = j0.2 p.u. = V₂= = 120° p.u. V3= 120° p.u. V₁ = 120° p.u. jX1(1) = j0.15 p.u. jX2(1) = j0.2 p.u. 1 jx(2) j0.15 p.u. 2 A 3 X2(2) 10.2 p.u. 4 jX11(0) = j0.2 p.u. jX(2(0) = j0.25 p.u. jXT(1) = j0.15 p.u. jXT(2) = j0.15 p.u. jXT(0) = j0.15 p.u. Figure Q3. Circuit for problem 3b). 0
1-6 Fa [1 1 1 Fb = a² a C Fao 1 a a² F Fal a1 a2-
Transcribed Image Text:1-6 Fa [1 1 1 Fb = a² a C Fao 1 a a² F Fal a1 a2-
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