5. The zero-, positive-, and negative-sequence bus impedance matrices for a three-buspower system are given below[0.10 0.15 0.12]Zus =j 0.15 0.10 0.08%3DpuL0.12 0.08 0.35][0.16 0.10 0.15]ZBus = ZBus =j0.10 0.20 0.14 puLo.15 0.14 0.30]%3DDetermine the per unit fault current and the bus voltages during fault for(a) A bolted three-phase fault at bus 2.(b) A bolted single line-to-ground fault at bus 2.(c) A bolted line-to-line fault at bus 2.(d) A bolted double line-to-ground fault at bus 2.

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5. The zero-, positive-, and negative-sequence bus impedance matrices for a three-bus power system are given below [0.10 0.15 0.12] Zu =j 0.15 0.10 0.08 pu L0.12 0.08 0.35] [0.16 0.10 0.15] ZBu = ZBus =j0.10 0.20 0.14 pu Lo.15 0.14 0.30] Bus %3D Determine the per unit fault current and the bus voltages during fault for (a) A bolted three-phase fault at bus 2. (b) A bolted single line-to-ground fault at bus 2. (c) A bolted line-to-line fault at bus 2. (d) A bolted double line-to-ground fault at bus 2.

5. The zero-, positive-, and negative-sequence bus impedance matrices for a three-bus power system are given below [0.10 0.15 0.12] Zu =j 0.15 0.10 0.08 pu L0.12 0.08 0.35] [0.16 0.10 0.15] ZBu = ZBus =j0.10 0.20 0.14 pu Lo.15 0.14 0.30] Bus %3D Determine the per unit fault current and the bus voltages during fault for (a) A bolted three-phase fault at bus 2. (b) A bolted single line-to-ground fault at bus 2. (c) A bolted line-to-line fault at bus 2. (d) A bolted double line-to-ground fault at bus 2.

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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True or false 1. The size of Y bus matrix for 6 bus power system is (6)*(5). 2. PV buses constitute the maximum number in a power system. 3. A balanced three phase system consists of positive sequence currents only. 4. Sub transient reactance of generator have a greater value than synchronous reactance and transient reactance for generator 5. Newton Raphson method is high accurate among the other power flow methods.
For different types of buses/nodes in load flow analysis, explain their definitions and possible numbers in a power system.
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A load flow analysis is to be performed on a four bus power system, the per unit admittance matrix of which is given below: [ (3.0- j9.0) (-2.0+ j6.0) (-1.0+ j3.0) (0.0+ jo.0) [Y]= |(-2.0+ j6.0) (3.5- j10.5) (-0.5+ j1.5) (-1.0+ j3.0) (-1.0+ j3.0) (-0.5+ jl.5) (3.5– j10.5) (-2.0+ j6.0) bus (0.0 + j0.0) (-1.0+ j3.0) (-2.0+ j6.0) (3.0- j9.0) | Bus number I is the swing bus, buses numbers 2 and 4 are load buses and bus number 3 is a generator bus. The system base is 100 MVA. a) Draw and label carefully an appropriate single line diagram of the power system, showing the actual values of both admittance and impedance. Outline how the bus admittance matrix is derived from the system single line diagram and explain the physical significance of the values of elements Y,, and Y, of Y above. bus b) If the loads at buses 2 and 4 are S, = (1.0+ j0.75) pu and S, = (0.5+ j0.3) pu. determine the value of the voltage V, at bus 2 that is produced by the first iteration of the Gauss-Seidel load flow…
Explain the concept of dynamic line rating (DLR) and its significance in optimizing power transmission capacity.
Determine the bus admittance matrix, Ybus for the following system. Assume a three phase 100 MVA per unit base. 2 GEN GEN 3 Bus to Bus R (pu) 1-2 1-3 2-3 2-4 2-5 3-4 4-5 .02 .08 .06 .08 .02 .01 .03 5 X (pu) B (pu) .06 .06 .24 .05 .18 .04 .24 .05 .06 .02 .04 .01 .10 .04
The one-line diagram of a 6-bus power system is shown below with per unit impedances on common base. Determine the YBus.
A single-line diagram of a four-bus system is shown in Figure 3: BUS 3 b- Assume that: 0.25 /0,25 ww m 10.1 j0.2 Zbus- j* Let a three-phase fault occur at bus 2 of the network. a- Determine Ybus of this system. BUS 2 0.125 BUS 1 10.2 j0,4 (ground is the reference node) Figure 3: Four-bus system. BUS 4 www m 10.1 0.2437 0.1939 0.1545 0.1457 0.1939 0.2295 0.1495 0.1507 0.1545 0.1495 0.1956 0.1046 0.1457 0.1507 0.1046 0.1955 10.2 c- Using Zbus, calculate the initial symmetrical RMS current in the fault, Assume the prefault voltage Vf at bus 2 to be 10°, and neglect all prefault currents. d- Determine the voltages during the fault at buses 1, 3, and 4. e- Compute the fault currents contributed to bus 2 by the adjacent unfaulted buses 1, 3, and 4. f Find the current flow in the line from bus 3 to bus 1.
Power System analysis subject
A three-bus power system has generators at buses 1 and 2 with per unit subtransient reac- tances G1X"=0.1 and G2X"=0.08. The per unit branch reactances are X12=0.05, X13=0.10, X23=0.05, with 0.0540 0.0368 0.0425 Zbus = j 0.0368 0.0506 0.0460 0.0425 0.0460 0.0782 The pre-fault voltage magnitude is 1.02 per unit and the system is unloaded. Suppose a three-phase fault occurs at bus 3. (a) Calculate the fault current I" at the faulted bus. (b) Calculate the per unit generator terminal voltages (V1, V½) during the fault. (c) Calculate the per unit line currents feeding bus 3 (I13, I23) during the fault.
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Why are resistors and inductors considered to be series impedance and capacitors considered as shunt impedance in transmission line modeling?