Calculate the fault current in each phase for a L-G faultoccurs at bus at machine-2 for the system shown in belowfig.All the reactaces are given in p.u on 100 MVA baseE =x4 = j0.2X2 = 10.2*0 = J0. 25LineX1 = x = j0.11Xp = j0.33Xa " j0.16X2 = J0.16Xo = j0.06%3DNA%3!%3DX, = x2 = j0.10X1 = x2 = Xo = 0.10None-j1.7747p.u-j1.4487p.u-j1.8847p.u

Sequence networks of the given system From the above sequence networks Positive sequence equivalent…

Calculate the fault current in each phase for a L-G fault occurs at bus at machine-2 for the system shown in below fig.All the reactaces are given in p.u on 100 MVA base E = 16º x = j0.2 Line X1 = x = j0.11 Xp = j0.33 X2 = 10.2 Xe = J0. 25 Xa* j0.16 X2 = J0.16 Xo = j0.06 X, = X2 = j0.10 X1 =X2 = Xg = 0.10 None -j1.7747p.u -j1.4487p.u -j1.8847p.u

Calculate the fault current in each phase for a L-G fault occurs at bus at machine-2 for the system shown in below fig.All the reactaces are given in p.u on 100 MVA base E = 16º x = j0.2 Line X1 = x = j0.11 Xp = j0.33 X2 = 10.2 Xe = J0. 25 Xa* j0.16 X2 = J0.16 Xo = j0.06 X, = X2 = j0.10 X1 =X2 = Xg = 0.10 None -j1.7747p.u -j1.4487p.u -j1.8847p.u

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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Calculate the fault current in each phase for a L-G fault occurs at bus at machine-2 for the system shown in below fig.All the reactaces are given in p.u on 100 MVA base E = 16º. Line x4 = j0.2 X1 = x2 = j0.11 Xp = j0.33 X2 = J0.2 X4 - j0.16 X = 30. 25 X2 = J0.16 Xo = j0.06 X1 = X2 = j0.10 X1 =X2 = Xo = 0.10 j1.8847p.u None -j1.7747p.u -j1.4487p.u
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(Q.2) For the following network, calculate the fault currents (IF1, IF2, IF3 and IF.) in pu and in kA, and fault MVA (ie. short-circuit level) at the indicated locations. Internal reactance of generators are j0.9 pu. Base quantities: 11 kV, 400 MVA on the generator side. 113.3 kV 4 MVA, 7% j0.5 2 j0.4 2 300 A 200 A 11 KV 250 MVA
33
Calculate the fault current in each phase for a L-G fault occurs at primary of transformer-2 for the system shown in below fig.All the reactaces are given in p.u on 100 MVA base E= 1/0º x = j0.2 Line X =x, = j0.11 Xp = j0.33 X2 = ]0.22 xe = 30.15 - j0.16 X2 = J0.17 Xo = j0.06 X, = x2 = j0.10 X1 =x2 = xg = 0.10 -j2.7831 -j2.3781p.u None -j2.2668 p.u ele
B1
The negative sequence current of a solidly grounded generator for single line to ground fault is j 2.5 p.u. Then the positive sequence current during the fault is equal to o j7.5 pu o jo.75 pu o j2.5 pu o jo.25p.u
True or false 1. Three phase fault is the most commonly occurring fault than other types of faults. 2. The range of generator rotor angle for stable operation is 0°< s < 180°. 3. The infinite bus in power system is a large system with infinite voltage. 4. At value of (s= 90°) the maximum power transfer takes place. 5. Per unit system (PU) is a ratio of actual value in any units to the base or reference value in the same units.
[3 2 11 BUS ZBus=j|2 4 2 Ω L1 2 3]
(b) A 30000 kVA, 13.8 kV generator with X = 18% is connected to a bus which supplies two identical motors as shown in the Figure 2. The subtransient reactance X of each motor is 25% on a base of 6000 kVA, 7 kV. The bus voltage at the motors is 7 kV when a three phase fault occurs at the point P. For the fault specified, determine (a) the subtransient current in the fault (b) the subtransient current in breaker A and (c) the symmetrical short circuit interrupting current in the fault and in breaker A. юю DO A P 0-0 Gen. Figure 2 Motors
Line to line to line fault is an asymmetrical type of fault in power system which occurs very frequently true false