TOPIC: Transmission Lines, Power Systems, and Powerplants: INSTRUCTIONS: - Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer. - Step-by-step solution, do not skip even simple calculations to avoid confusion. - If answered in written form, make sure it is readable. PROBLEM: The per-phase constants of a 345-kV, three-phase, 150-km-long transmission line are resistance = 0.112/km, inductance-1.1 mH/km, and capacitance = 0.02 uF/km. The line supplies a 180-MW load at 0.9 power factor lagging. Using the nominal-m circuit, determine the sending-end voltage in kV. 351.2 349.3 348.7 350.8

TOPIC: Transmission Lines, Power Systems, and Powerplants: INSTRUCTIONS: - Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer. - Step-by-step solution, do not skip even simple calculations to avoid confusion. - If answered in written form, make sure it is readable. PROBLEM: The per-phase constants of a 345-kV, three-phase, 150-km-long transmission line are resistance = 0.112/km, inductance-1.1 mH/km, and capacitance = 0.02 uF/km. The line supplies a 180-MW load at 0.9 power factor lagging. Using the nominal-m circuit, determine the sending-end voltage in kV. 351.2 349.3 348.7 350.8

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.48P: The capacitance of a single-circuit, three-phase transposed line with the configuration shown in...

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1. FIGURE 52 shows the one-line diagram of a simple three-bus power system with generation at bus I. The voltage at bus l is V1 = 1.0L0° per unit. The scheduled loads on buses 2 and 3 are marked on the diagram. Line impedances are marked in per unit on a 100 MVA base. For the purpose of hand calculations, line resistances and line charging susceptances are neglected a) Using Gauss-Seidel method and initial estimates of Va 0)-1.0+)0 and V o)- ( 1.0 +j0, determine V2 and V3. Perform two iterations (b) If after several iterations the bus voltages converge to V20.90-j0.10 pu 0.95-70.05 pu determine the line flows and line losses and the slack bus real and reactive power. 2 400 MW 320 Mvar Slack 0.0125 0.05 300 MW 270 Mvar FIGURE 52
TOPIC: Transmission Lines, Power Systems, and Powerplants:INSTRUCTIONS:- Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer.- Step-by-step solution, do not skip even simple calculations to avoid confusion.- If answered in written form, make sure it is readable.PROBLEM:The per-unit impedance of a system is 0.7 pu. The base KVA is 300 kVA, and the base voltage is 11 kV. What is the per-unit impedance referred to as the 400-KVA and 38-KV base values? 0.0782 0.0735 0.0674 0.0691
TOPIC: Transmission Lines, Power Systems, and Powerplants:INSTRUCTIONS:- Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer.- Step-by-step solution, do not skip even simple calculations to avoid confusion.- If answered in written form, make sure it is readable.PROBLEM:A 138-kV, three-phase short transmission line has a per-phase impedance of (2 + 14) 2. If the line supplies a 25-MW load at 0.8 power factor lagging, calculate the sending-end voltage in kV. 139.8 137.9 139.5 138.6
Problem #1 • An overhead line has span of 260m. The tension in the line is 1200kg while the conductor weighs 650 kg per 100 meters. Calculate the maximum SAG in the conductor. If the height of the tower is 13 meters, estimate the clearance of conductor to the ground. Draw a figure and mark values of sag, clearance, span, height of conductor etc.
An overhead line has span of 260m. The tension in the line is 1200kg while the conductor weighs 650 kg per 100 meters. Calculate the maximum SAG in the conductor. If the height of the tower is 13 meters, estimate the clearance of conductor to the ground. Draw a figure and mark values of sag, clearance, span, height of conductor etc.
Q3: A synchronous generator with peak generated voltage Vg which is connected to a lighting arrester through a transmission line with characteristics impedance ZL and the lighting arrester equal to the one half of ZL. Let the generator characteristic impedance be one third of ZL. Determine:(i) Calculate the current in the lighting arrester, (ii) Calculate the voltage in lighting arrester, and (iii) the value of lighting arrester resistance must be connected to transfer maximum power?
The symmetrical short circuit current is ______________________ quantity in nature. a-Exponential b-Ramp c-Alternating d-Direct
Figure Q2 (a) shows the spacing of a double circuit 3-phase overhead line. The phase sequence is RYB and the line is completely transposed. i) Critically assess the significance of transposition in a 3-phase overhead line. ii) Calculate the inductance per phase for 500 meter length of line using Table 2(a) data for the Figure Q2(a). Table 2(a) GMR of the line Distance a-b' 0.01m 6.6m Distance a-a' 8.5m Figure Q2(a)
(b) Given the two-machine system of Figure Q2 (b), a base voltage of 132 kV for the transmission line and a base volt-ampere of 25MVA is selected for the system. The line impedance is 20+j60 Q. The apparatus has ratings as given in Table Q2 (a). (i) Calculate the per unit impedances of all components referred to the base. (ii) Draw the system equivalent circuit. Table Q2 (a) Item Apparent power Voltage rating Reactance Generator 15 MVA 13.8 kV x = 0.15 pu Motor 10 MVA 13.2 kV x = 0.15 pu T1 25 MVA 13.2/ 132 kVx = 0.10 pu T2 15 MVA 13.8/132 kV x =0.10 pu T Line Generator T2 Motor (M Transformer 1 Transformer 2 Figure Q2 (b)
Q2(a) Figure Q2(a) shows the spacing of a double circuit 3-phase overhead line. The phase sequence is UVW and the line is completely transposed. i) Critically assess the advantages of double circuit line over single circuit line Calculate the inductance per phase for 500 meter length of line using Table 2(a) data for the Figure Q2(a). Table 2(a) GMR of the line 0.01m Distance a-b' 6.m Distance c-c' 8.3m a b Figure Q2(a)
Subject: Electrical & Electronics Engineering Course: Power Systems Question: What is GMR and GMD? Explain your answer in case of a composite conductor.
TOPIC: Transmission Lines, Power Systems, and Powerplants:INSTRUCTIONS:- Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer.- Step-by-step solution, do not skip even simple calculations to avoid confusion.- If answered in written form, make sure it is readable.PROBLEM:The conductors of a three-phase transmission line are arranged in the form of an equilateral triangle with sides 6m each. If the conductors are 500 mils in diameter and the line is 25km long, what is its inductance per phase in mH? 39.7 26.3 17.4 35.5