Problem 3. A 22-kV, three-phase transmission line is 16 km long. The line has a per phase impedance of0.125 + j0.475 Q/km. The transmission line is delivering 70 MVA, 0.8 power factor lagging at 64 kV.a) Draw the equivalent circuit;b) Determine the parameter of two-port network model;c) Determine the voltage, current at the sending end;d) Determine the voltage regulation and the transmission efficiency.

Answered: Image /qna-images/answer/a274dbaf-478b-431b-8946-1109976c9c6f.jpg

Answered: Problem 3. A 22-kV, three-phase…

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 transmission line has a per unit impedance of 0.5 pu at 500 MVA and 132 kV base. The per unit impedance on the base of 200 MVA will be
A 3-phase, overhead transmission line has a total series impedance per phase of 200 ohms and a total shunt admittance of 0.0013 siemens per phase. The line delivers a load of 80 MW at a 0.8 pf lagging and a 220 kV between the lines. Determine the sending end line voltage and current by Rigorous method.
2. A balanced load of 30 MW is supplied at 132 kV, 50 Hz and 0-85 p.f. lagging by means of a transmission line. The series impedance of a single conductor is (20 + j52) ohms and the total phases-neutral admit- tance is 315 microsiemens. Shunt leakage may be neglected. Using the nominalT approximation, calculate the line voltage at the sending end of the line. If the load is removed and the sending end voltage remains constant, find the percentage rise in voltage at the receiving end.
If value of voltage Vs is 20kv and VR is 15 kv with load angle of 20 degrees. Value of line reactance is 5(ohm) Find value of active power and reactive power at receiving end of line.
2. A 200-km, 230-kV, 60-Hz three-phase line has a positive-sequence series impedance z = 0.07 + j0.58 ohms/km and a positive-sequence shunt admittance y = j4.33 x 10^-6 S/ km. At full load, the line delivers 350 MW at 0.95 pf lagging and at 220 kV. Using the nominal pi circuit, calculate: (a) the ABCD parameters (b) the sending-end voltage and current, and (c) the percent voltage regulation.
d) Calculate the per unit voltage drop on the transmission line e) Calculate also the sending end voltage Use an overall base of 100 MVA.
The parameters of a three-phase line 200 km long are resistance/km =0.15 , inductive/km=0.5 and capacitive susceptance/km 2 x 10^6 ohm. The transmission line is delivering 50 MVA at 132 kV with power factor 0.85 lagging. Use nominal T method to determine; 1) sending end voltage 2) sending end current 3) sending end power factor 4) transmission efficiency and 5) voltage regulation.
A single circuit 60 Hz transmission line. the conductors are Linnet type with flat horizontal spacing of 17.46 feet between conductors. Determine: (a) Assume that the line is short with a length of 50 miles, calculate the parameters of the line and draw the equivalent circuit. (b) Assume that the line is average with length of 150 miles (Pi-nominal model). draw the pi-nominal circuit for the transmission line and calculate its parameters (Z and Y/2 values, where Z is the series impedance of the transmission line and Y is the shunt admittance).
1. Following are types of Transmission Lines EXCEPT A. Medium Line B. Long Line C. Capavitive Line D. Short Line 2. What is the theory used to express the voltage and current relations? A. Per-Phase B. Equavalent Transmission Line Model C. Two Ports Network 3. A 300km transmission line is considered as A. Long Line B. Medium Line C. Short Line 4. For a short transmission line, values for element A B C and D are A. A=1, B=0, C=Z, D=1 B. A=1, B=Z, C=0, D=1 C. A=0, B=Z, C=1, D=1
Assuming the voltage at the utility bus is 13.5 kV and the PV plant supplies 4.8 MW of power at 0.95 power factor lagging. Draw the diagram of the system and determine i) the per-phase voltage and current at the POI at the PV plant ii) the reactive power delivered and that which is lost in the line. Assume the line is modelled as a short line.

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