1.4. Find out the fault current and generator terminal voltage in p.u. for (a) phasea to ground fault and (b) phase b-to-c short circuit at bus 1 in circuits shownbelow.+381,슝wadGD가G1: Xa" = 0.1pu, z_ = j0.1pu, z_0 = j0.05puT1: X = 0.12pu3슨1검load

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Answered: 1.4. Find out the fault current and…

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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A three-phase fault with a fault impedance Zf = j0.16 per unit occurs at bus 3 in the Figure beside, Using the bus impedance matrix method, compute the fault current, the bus voltages, and the line currents during the fault. the bus impedance matrix is obtained the bus impedance matrix for this system is 30.16 j0.08 j0.12 Z = 30.08 j0.24 j0.16 j0.12 j0.16 j0.34 elark -j2.5 -1.25 -12.5 -12.5 Va = Va(0) a(F) 2,- j0.16 The fault current in p.u is: Answer:
T 2 (3 T₂ (4) Machine 1 FLY Machine 2 Krossy 147 YA For the three-phase power system with single-line diagram, equipment ratings and per-unit reactances are given as follows: Machines 1 and 2: 120 MVA, 10.5 kV, X = X2 = 0.2, X₁ = 0.03, X = 0.03; Transformers 1 and 2: 120 MVA, 11D/115Y kV, X₁= X2 = X0 = 0.05. Select a base of 120 MVA, 115 kV for the transmission line. On that base, the series reactances of the line are X1 X2 = 0.3 and Xo = 2X1 per unit. With a nominal system voltage of 115 kV at bus 3, machine 2 is operating as a motor drawing 40 MVA at 0.8 power factor lagging. Compute the fault current for single-line-to-ground fault at bus 3
A synchronous generator and motor are rated for 30,000 kVA, 13.2kV and both have sub-transient reactance of 20%. The line connecting them has a reactance of 10% on the base of machine ratings. The motor is drawing 20,000kW at 0.8 pf leading. The terminal voltage of the motor is 12.8kV. When a symmetrical three-phase fault occurs at motor terminals, find the sub transient current in generator, motor and at the fault point.
Q2) The single-line diagram of a three-phase power system is shown in the figure below. The inductor connected to Generator 3 neutral has a reactance of 0.05 per unit using generator 3 ratings as base. Use a 1000-MVA, 765-kV base in the zone of line 1-2. Equipment ratings are given as follows: Synchronous generators: G1 1000 MVA 15 kV G2 1000 MVA 15 kV G3 500 MVA 13.8 kV G4 750 MVA 13.8 kV Transformers: T1 1000 MVA T2 1000 MVA T3 500 MVA T4 750 MVA Transmission lines: 1-2 765 kV 1-3 765 kV 2-3 765 kV 15 kV A/765 kV Y 15 kV A/765 kV Y 15 kV Y/765 kV Y 15 kV Y/765 kV Y X = X₂ = 0.18, Xo = 0.07 per unit X=X₂=0.20, Xo = 0.10 per unit X=X₂ = 0.15, Xo = 0.05 per unit X=0.30, X₂ = 0.40, Xo = 0.10 per unit X₁ = 50 2, Xo = 150 2 X₁ = 40 2, Xo = 100 2 X₁ = 40 2, Xo = 100 2 at Line 1-3 Line 1-2 2 X = 0.10 per unit X = 0.10 per unit X = 0.12 per unit X = 0.11 per unit Line 2-3 3 youtly
A three-phase fault with a fault impedance Zf = jo.16 per unit occurs at bus 3 in the Figure beside, Using the bus impedance matrix method, the bus impedance matrix for this system is: j0.16 j0.08 j0.12 Zu =| j0.08 j0.24 j0.16 30.12 j0.16 j0.34 ーブ5 ー2.5 ー1.25 ープ2.5 -j2.5 Ve = V3(0) Is(F) [X || Z, = j0.16 The bus voltage of Bus1 (V,(F) in p.u is: Answer: 0.76 p.u
Q4/A:For the given tie-bar system, a three phase fault occurs at the feeder supplied by the three generators shown. The feeder has an impedance Zf = j0.12 22/phase on a base of 6.6 kV and suitable MVA base. Estimate the maximum MVA that can be fed into this symmetrical fault. All values are in p.u. (15 M) 50 MVA Feeder A Jx=10% jx=12% 50MVA B jx-12% jx= 10% 50 MVA C jx-12% jx=10% Tie bar
j0.2 For the following power system the impedance matrix is given below. Initially all bus voltages are 1 pu. Then a three-phase fault occurs at bus (2). j0.25 j0.2 (3) (1) j0.1 : (a) What is the fault current? (2) j0.125 j0.1 (b) What are the post-fault bus voltages? 3. 0.0625 0.02083 0.02083' Zbus 0.02083 0.07044 0.02282 0.02083 0.02282 0.06091
8
In a three-phase system the per-unit phase voltages are 100° , Vôn = 0.8Z180° Van 0.920° , Von = 0.92 - а What are the per-unit symmetrical components V0) and V)? Express in polar notation.
A hydro powered 50 MVA generator, with a synchronous reactance 0.33 p.u., delivers 40 MW over a transmission line of 0.15 p.u. reactance to an infinite system. A 3-phase short circuit transient fault occurs on the busbar between the generator and transmission line. Given that the generator emf is 1.4 p.u. prior to and during the fault and all reactances are to a 50 MVA base: Sketch the single line schematic diagram of the system. Determine the maximum load angle the generator can swing to without losing stability. i) ii) iii) iv) Sketch the corresponding power-angle curve for the system showing the accelerating and decelerating areas. Calculate the critical clearing angle of the system to keep its stability.
The bus impedance matrix for a three-bus power system has per-unit elements as: Z11 = 0.5 Z12 = 0.4 Z13 = 0.8 Z21 = 1 Z22 = 0.5 Z23 = 0.6 Z31 = 0.5 Z32 = 1.2 Z33 = 1 Prefault voltage is 1 per unit and prefault current is neglected. A three-phase short circuit occurs at bus 3. Determine the subtransient fault current. Round your answer to 2 decimal places.
Refer to the 5-bus data given below. Sbase = 400 MVA, the base voltage is 15.0 kV for buses 1 and 3, and 345 kV for buses 2, 4, 5. Note that 1-5 and 3-4 are 15/345 kV transformers.a) Draw a one-line diagram of the power system.b) Find the elements Y23, Y43, Y11 Y33 of the system bus admittance matrix.

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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. @+-35 뮤 높게 7 흉 wad G1: Xa" = 0.1pu, z_ = j0.1pu, z_0 = j0.05pu +36 ² 검 load