3 Consider the one-line diagram of power system shown below; if a bolted three-phase fault (F1) occurs at the receiving end of the transmission line as shown: Gi 1 100 MVA, 11/132 kV 10% Reactance 100 MVA, 11 kV 15% Reactance Ti X-0.2 olm/phase/km G2 T2 200 km 50 MVA, 11 kV 10% Reactance 3 ph F1 faui F2 50 MVA, 11/132 kV 8% Reactance a) Develop equivalent circuit expressing all parameters in per unit values select Sbase= 100MVA b) Apply circuit reduction techniques and then find the net impedance(Zeg) at point of fault F1 c) Calculate fault level and fault current

3 Consider the one-line diagram of power system shown below; if a bolted three-phase fault (F1) occurs at the receiving end of the transmission line as shown: Gi 1 100 MVA, 11/132 kV 10% Reactance 100 MVA, 11 kV 15% Reactance Ti X-0.2 olm/phase/km G2 T2 200 km 50 MVA, 11 kV 10% Reactance 3 ph F1 faui F2 50 MVA, 11/132 kV 8% Reactance a) Develop equivalent circuit expressing all parameters in per unit values select Sbase= 100MVA b) Apply circuit reduction techniques and then find the net impedance(Zeg) at point of fault F1 c) Calculate fault level and fault current

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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X 0.1j Z12 = 0.1 j Z23 = 0.1 j 0.2 j KAY 02) 0.1j Load 1 Load 2 Load 3 Consider the single line diagram shown in the figure. All impedances are expressed in per unit on a common 100 MVA base. The generator transient reactance =0.5 j. The Bus 1 prefault voltage (1 + 0.0 j). If a bolted three phase fault occur at bus 1. The magnitude of fault current is: Select one O a. 5.8 pu b. 7.5 pu c. less than 5.8 pu O d. 11.6667 pu e. greater than 12.0 pu
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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
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2) The power system consists of generators, motors, transformers, and transmission lines. The ratings are as follows: G1: 3-phase generator 25 MVA, 11 KV, X = 20% M1: 3-phase motor M2: 3-phase motor T1:3 single phase transformers T2: 3-phase transformer Line: 15 MVA, 13 KV, X = 25% 7.5 MVA, 13 KV, X = 25% Single phase transformer rating 30 MVA, 6.9/69 KV X = 10% Three phase transformer rating 30 MVA, 13.8/69 KV X = 10% Χ - 50 Ω = Τι G₁ 2. Line Figure 1. 3 T2 Σ M₁ Δι M2 Find the reactance (X) in p.u. units, given the base value of 25 MVA, 11 KV.
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
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Q1. The following figure shows the differential protection of power transformers with specifications of 20 MVA, 66/11 KV.Trans is No load.If a two-phase short circuit occurs between phases b and ¢ It is desirable to calculate the currents passing through the CTs and relays R, Y, B. If these relays are three overcurrent relays with inverse characteristics as T=0.63 / log (I / Iset) and Iset =0.5A.Will this work for short circuit relays? If yes, which relay works faster and at what time?
1.4. Find out the fault current and generator terminal voltage in p.u. for (a) phase a to ground fault and (b) phase b-to-c short circuit at bus 1 in circuits shown below. +38 1, 슝 wad GD 가 G1: Xa" = 0.1pu, z_ = j0.1pu, z_0 = j0.05pu T1: X = 0.12pu 3슨 1 검 load
Q.4 A 3-phase transmission line operating at 10 KV and having a resistance of 1 Q and reactance of 4 0 is connected to the generating station bus-bars through 5 MVA step-up transformer having a reactance of 5%. The bus bars are supplied by a 10 MVA alternator having 10% reactance. Calculate the short-circuit KVA fed to symmetrical fault between phases if it occurs (i) at the load end of transmission line. (ii) at the high voltage terminals of the transformer.
(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