A three-phase, 60-Hz, untransposed transmission line runs in parallel with a telephone line for 20 km. The power line carries a balanced three-phase rms current of Ia = 32020°A, I, = 3202-120°A, and = 3202 – 240°A. The line configuration is as shown in figure. Assume zero current flows in the ungrounded telephone wires. Find the magnitude of the voltage induced in the telephone line. a b. 4 m 4 m 5 m d G2 m-O

A three-phase, 60-Hz, untransposed transmission line runs in parallel with a telephone line for 20 km. The power line carries a balanced three-phase rms current of Ia = 32020°A, I, = 3202-120°A, and = 3202 – 240°A. The line configuration is as shown in figure. Assume zero current flows in the ungrounded telephone wires. Find the magnitude of the voltage induced in the telephone line. a b. 4 m 4 m 5 m d G2 m-O

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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Shown are two buses connected via a transmission line. Connected to Bus 1 is a generator(modelled as a voltage source V1), and to Bus 2 is a generator( with Voltage V2) and a load. The line impedance Z = R + jX is not known. Three-phase load is forecasted as 100MW + 60MVar. Generator at Bus 2 is scheduled to deliver 40MW and its excitation is adjusted for the machine to deliver 55 MVar. Voltage at Bus 1 is 241 KV angle 10 deg, while voltage at bus is 230 kV; use V2 as the reference for all angles. 1. What is the current (RMS) in amperes drawn by the load connected to Bus 2? 2. How much real power (in MW) is delivered by the generator connected to Bus 1? 3. What is the total real power loss along the line, in percent of the load? 4. What is the X/R Ratio of the line impedance?
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For a single phase ac voltage controller/chopper, which is designed by using thyristors, with the series R (=18[Ohm]) and L(=30 [mH]) load, if the rms value of the current flowing through each thyristor in the chopper circuit is equal to 1.83[A], then calculate average power absorbed by the load.
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Discuss the role of FACTS (Flexible AC Transmission Systems) devices in enhancing power system stability and control.
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 a contingency analysis. The initial flows calculated with the DC power flow give the following information: f°2-4 = - 65.3 MW and fº4-5 = 13.6 MW. The following values of LODF and PTDF factors are given: PTDF54,2-4 = -0.2609, LODF2-4,4-5 = -0.6087. Calculate the contingency flow on line 2-4 due to outage of line 4-5. Select one: O a. -75.5MW O b. None of these O c. -68.85MW O d. -73.58MW O e. 75.5MW O f. -61.75MW
For the system shown in figure, voltages V2, V3 and angles 82, 83 are calculated using Newton-Raphson method. shunt line charging admittances are neglected. All the values are given in per unit on 100MVA base. Calculate the complex power flows S12 and S32 in actual units. 1) Z12 = 0.01+ j0.02 Z3 = 0.02+ j0.04 PL G QL Slack bus V2 = 0.96L -1.67° V3 = 0.884 - 5.48° Vi=1.0/0° (estimated time to answer this question: 13 minutes)
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3. A circuit consists of two impedances. Z1 =20230° and Z2 =25260° 2, in parallel, supplied by a source voltage V=1002600 volts. Determine the power triangle for each of the impedances and for the source.
A three-phase transmission line and a telephone line are supported on the same towers a shown in the figure. The power line carries a 60-Hz balanced current of 200-A per phase . the telephone line is located directly below phase b. assuming balanced three-phase currents in the power line, find the voltage per kilometer induced in the telephone line. 3.6 m 3.6 m Dal Da2 Del De 4 m 11.2 m-