Q2/The positive-sequence reactances for the power system shown in Figure are in per unit on a common MVA base. Resistances are neglected and the negative-sequence impedances are assumed to be the same as the positive-sequence impedances. A bolted line-to-line fault occurs between phases b and c at bus 2. Before the fault occurrence, all bus voltages are 1.0 per unit. Obtain the positive sequence bus impedance matrix. Find the fault current, the three-phase bus voltages during fault, and the line currents in each phase. X=j0.05 j0.15 (G₁) T₁ 1 TEO 3 11 j0.6 j0.3 2 T2 j0.05 X=j0.05 BIG 4

Q2/The positive-sequence reactances for the power system shown in Figure are in per unit on a common MVA base. Resistances are neglected and the negative-sequence impedances are assumed to be the same as the positive-sequence impedances. A bolted line-to-line fault occurs between phases b and c at bus 2. Before the fault occurrence, all bus voltages are 1.0 per unit. Obtain the positive sequence bus impedance matrix. Find the fault current, the three-phase bus voltages during fault, and the line currents in each phase. X=j0.05 j0.15 (G₁) T₁ 1 TEO 3 11 j0.6 j0.3 2 T2 j0.05 X=j0.05 BIG 4

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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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
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Electrical Engineering Design a power system network consists of the following: į, 2 generators ii. 2 transformers iii. 2 transmission lines iv. Suitable number of busbars Then, for the designed network, perform the following: j. Load flow analysis. You must clearly identify the bus type to perform this. ii. Fault analysis – Balanced and unbalanced faults Next, perform manual calculations for the following: i, Load flow analysis using either Gauss Seidel or Newton Raphson Method. ii. Fault analysis (balanced and unbalanced faults) on any one fault point.
Power flow analysis is used for __________________ in power system. a. Stability Analysis b. Future Expansion c. Fault Analysis d. Symmetrical fault analysis
Power system analysis
Suppose V-1.00°p.u., z = jo.50 p.u., z - z) - j0.25 p.u.; draw a sequence network connection in case of bolted (phase) line-to-line (phase) fault. Determine the fault current and the bus voltage at the fault point.
Figure below shows the single-line diagram of three-bus power system with generation at bus 1 and bus 3. The voltage at bus 1 is V₁ = 1.025/0° per unit. The voltage magnitude at bus 3 is fixed at 1.05 per unit with a real power generation of 250 MW. The scheduled load on bus 2 is marked on the diagram. Line impedances are marked in per unit on a 100 MVA base. Line resistances and line charging susceptances are neglected. By using Gauss-Seidel method and initial estimates of V₂(0) = 1.020° and V3(0) = 1.0520°, determine V₂ and V3. Perform calculation for one iteration. V₁ = 1.025/0° j0.1 Slack Bus j0.2 j0.4 j0.2 3 j0.1 250 MW 150 Mvar |V3|=1.05 P3 = 250 MW
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.
Given the network shown, for a solid three-phase fault on bus 2 (a) find the sub transient current in per unit from generator 1 and in line 1-2; (b) find the voltages at bus 1 and bus 3. Assume that no current is flowing prior to the fault and that the pre fault voltage at bus 2 is 1.0 per unit. Show your solution.
Q2\ The one-line diagram of a simple power system is shown in figure below. All impedances are expressed in per unit (pu) on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage. A three-phase fault occurs at bus 1 through a fault impedance of Zf = j0.08 per unit. Using Thevenin's theorem obtain the impedance to the point of fault and the fault current in per unit. Determine the bus voltages and line currents of generators during fault. X₁ = = 0.1 XT-0.1 3 1 to ojo XL=0.2 2 040 X₁ = 0.1
At a 220 kV substation of apowersystem, it is given that the three-phase fault level is 4000 MVA and single-line toground fault level is 5000 MVA. Neglecting the resistance and the shunt susceptances ofthe system The positive sequence driving pointeactance at the bus is:
The positive sequence reactance for the power system shown in Figure below are in per unit on a common MVA base. Resistances are neglected and the negative sequence impedances are assumed to be the same as the positive sequence impedances. A bolted line to line fault occurs between phase 'b' and phase 'c' at bus 2. Before the fault occurrence, all bus voltages are 1.0 per unit. (i) Obtain the positive sequence bus impedance matrix. (ii) Find the fault current, the three phase bus voltages during fault at all the buses. (iii) Find the three phase currents through the transformer T1 during the fault. 2 3 XL1 X= j0.05 (G1 X= j0.05 G2 XT1 XT2 XL2 4 XT1 XL1 X12 XT2 jo.15 jo.25 jo.5 jo.15