A network consisting of a set of generator and load buses is to be modeled with a DC power flow, for the sake of conducting acontingency analysis. The initial flows calculated with the DC power flow give the following information: f°2-4 = - 65.3 MW and fº4-5 = 13.6MW. The following values of LODF and PTDF factors are given: PTDF54,2-4 = -0.2609, LODF2-4,4-5 = -0.6087. Calculate the contingency flowon line 2-4 due to outage of line 4-5.Select one:O a. -75.5MWO b. None of theseO c. -68.85MWO d. -73.58MWO e. 75.5MWO f. -61.75MW

Given PTDF5,42-4 =-0.2609 LODF2-4,4-5 =-0.6087 Base case flow on line 4-5 is F04-5=13.6 MW Base case…

Answered: A network consisting of a set of…

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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The VSWR on an 50-Ohm transmission line is 5. The distance between successive voltageminima is 80 cm while the distance from the load to the first minimum is 30 cm. What are thereflection coefficient and load impedance
How did they get Zc=j0.43 and Zl=j0.43? How did they get the diagram break down simply?
The load flow data for the sample power system are given below. The voltage magnitude at bus 2 is to be maintained at 1.04 p.u.Determine the set of load flow equations at the end of first iteration by using N-R method. Impedance for sample system Bus Code 1-2 1-3 2-3 Schedule of generation and loads: Impedances 0.08 + j0.24 line charging admittance 0.0 0.02 + j0.06 0.0 0.06 + j0.18 0.0 Bus Code Assured Voltages Generation Load MW MVAR MW MVAR 1 1.06 + j0.0 0 0 0 2 1.0 + j0.0 0.2 0.0 0.0 0.0 3 1.0 + j0.0 0 0 0.6 0.25
What are the basics of transmission lines? What is characteristic impedance? How can we derive the equation for characteristic impedance and velocity explain where got all symbols from? What is crosstalk and how do you calculate this? How is impedance measured?
he node (busbar) and branch (line) data of a power system are provided in Table Q1.1 and Table Q1.2 respectively. All values in the tables are stated in per unit (p.u.). Using node 1 (busbar 1) as the reference (slack bus), calculate the line flows using the DC power flow method.
4. A 4160V, three phase source, 4-wire supplying an unbalanced three phase load. The unbalanced connected load are: Zan = 150/53.13° ; Zbn = 150-53.13° ; Zen = 1500° Assuming positive sequence and the reference is the line voltage "a", determine: a. the line current "a" b. the line current “b” c. the line current "c". d. the total real power e. the total reactive power f. the total apparent power g. the overall power factor. h. the neutral current.
6. In figure below the rating of reactance and various components are shown. A load of 50MW at p.f. lagging is taking from the 33kv substation which is to be maintained at 30kv. Calculate the terminal voltage of the synchronous machine (Vs) in pu, also represent the line and transformer in series reactance. The system is three phase system V6 11 kV 132 kV 132 kV 33 kV 50 MW Line 0.8 p.f. lagging j1000 50 MVA X 10% 50 MVA X 12% 30 kV
What are FACTS (Flexible Alternating Current Transmission Systems) devices, and how do they enhance power system control?
The steady-state voltage drop between the load and the sending end of the line seen in (Figure 1) is excessive Suppose that V-4950/0° V (rms). A capacitor is placed in parallel with the 192 kVA load and is adjusted until the steady-state voltage at the sending end of the line has the same magnitude as the voltage at the load end, that is, 4950 V (rms). The 192 kVA load is operating at a power factor of 0.8 lag. Part A Calculate the size of the capacitor in microfarads if the circuit is operating at 60 Hz. In selecting the capacitance, use the value that results in the lowest possible power loss in the line. Express your answer in microfarads to three significant figures. ▸ View Available Hint(s) Figure 1 of 1 202 1100 192 kVA 0.8 lag ΜΕ ΑΣΦ. 11 vec C= 22.8 Submit Previous Answers Incorrect; Try Again; 5 attempts remaining Provide Feedback ? F
By comparing the principle of operation of a "three" phase generation system with a single-phase system, state what are the bendfits of three phase systems? In your own words, define the "skin effect" in transmission lines and discuss how can it be minimised? Name three advantages of AC transmission in comparison to DC transmission. What are the units of active, reactive and apparent power? The current in a single-phase motor lags 50° behind the voltage. What is the power factor of the motor?
Example 8.4 The one line diagram of a simple three-bus power system is shown in the figure. Each generator is j0.1 j0.2 represented by an emf behind the transient reactance. All impedances are expressed in per unit j0.1 j0.2 in a common 100 MVA base, and for simplicity, j0.8 resistances are neglected. The following assumption 2 are made: j0.4 j0.4 •shunt capacitances are neglected and the system is considered on no load. •all generators are running at their rated voltage 3 and rated frequency with their emf in phase Determine the fault current, the bus voltages and the line currents during the fault when a balanced three-phase fault with a fault impedance Z; = j0.16 %3D p.u. fault occurs on bus 3
How do FACTS (Flexible Alternating Current Transmission Systems) devices improve power system control and stability?

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