(b) An unbalanced delta connected load consisting of the phase impedances ZRY (10+j3) N, ZYB (12+j0) Q and ZBr (8+j3) 2 is connected to a 3-phase, 440 V, 50 Hz supply. Draw the circuit diagram including the implementation of a 2 wattmeter power measurement. Using the information above: Calculate the 3 load phase currents (IRY, IYB and IBR). Draw a scaled phasor diagram indicating all phase and line voltages and the three load phase currents. Using the scaled phasor diagram or otherwise determine the 3 line currents (IR, ly and /B). (i) (ii) (iii)

(b) An unbalanced delta connected load consisting of the phase impedances ZRY (10+j3) N, ZYB (12+j0) Q and ZBr (8+j3) 2 is connected to a 3-phase, 440 V, 50 Hz supply. Draw the circuit diagram including the implementation of a 2 wattmeter power measurement. Using the information above: Calculate the 3 load phase currents (IRY, IYB and IBR). Draw a scaled phasor diagram indicating all phase and line voltages and the three load phase currents. Using the scaled phasor diagram or otherwise determine the 3 line currents (IR, ly and /B). (i) (ii) (iii)

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...

See similar textbooks

Similar questions

single circuit three-phase line, 60 Hz, 18 km has a total resistance and inductive reactance of 4.242 ohm and7.451 ohm per phase respectively. The line delivers 2500 kW to a balanced load at 11 kV. (1) determine the sending-end voltage when the power factor is (i) 80% lagging, (i) unity, and (ii) 90 % leading, (2) draw the phasor diagrams of the line at the above (3) determine the voltage regulation of the line at the above power factors.
A three-phase overhead line has a load of 30MW, the line voltage is 33kV and power factor is 0.85 lagging. The receiving end has a synchronous compensator, 33kV is maintained at both ends of the line. (i)Calculate the MVAr of the compensator given that the line resistance is 6.5Ω per phase and inductance reactance is 39Ωper phase. (ii)Repeat your calculation using the short-circuit current at node method. Compare and explain the difference between the results.
1. A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase series impedance of 0.125+j0.4375 Ω per km. Determine the sending end voltage, voltage regulation, the sending end power, and the transmission efficiency when the line delivers (a) 70 MVA, 0.8 lagging power factor at 64 kV. (b) 120 MW, unity power factor at 64 kV. Use lineperf program to verify your results. 2. A three-phase, 765-kV, 60-Hz transposed line is composed of four ACSR, l,431,000-cmil, 45/7 Bobolink conductors per phase with flat horizontal spacing of 14 m. The conductors have a diameter of 3.625 cm and a GMR of 1.439 cm. The bundle spacing is 45 cm. The line is 400 km long, and for the purpose of this problem, a lossless line is assumed. (a) Determine the transmission line surge impedance Zc, phase constant ß, Wavelength, the surge impedance loading SIL, and the ABCD constant. b) The line delivers 2000 MVA at 0.8 lagging power factor at 735 kV. Determine the sending end quantities and…
An Alternator having three-phase, 3-wire ABC system supplying an effective line voltage of 120 V, has an a three-impedances of 50 / 45 ohms in Delta connection. Assume that Vbc is the reference vector. In problem above, assuming that it is Wye connected load and VAN is the reference vector. Determine the total true power, reactive power, apparent power of the connected load. What is the capacity in Kva of synchronous generator if the connected load is 85%
S.4) the length of a three-phase power transmission line with a Nominal operating voltage of 69 kV is 16km. The impedance of the transmission line per unit length is 0.125 + j0.4375 ohm/km. From the end of the line, a 56 MW star connected load is fed with a power coefficient of 0.8 back under a 64 kV interphase voltage. If the line head voltage of the transmission line is 69 kV, calculate the capacity and power of the star-connected capacitor to be shunted into the load connected to the end of the line.
The length of a three-phase power transmission line with a nominal operating voltage of 69 kV is 16km. The impedance of the transmission line per unit length is 0.125 + j0.4375 ohm/ km. At the end of the line, a 70 MVA star connected load with a power factor of 0.8 back under 69 kV interphase voltage is fed. Capacitive circuit element with a capacitance of 19.14 mikro F / phase is placed as shunt at the end of the transmission line. According to these given; a) Line head voltage and current, b) Calculate the active and reactive power per line.
A balanced, three-phase, positive sequence source, supplies power to a balanced delta-connected load. Additional information given for this system are as follows: Ic = 10.5 cis 98 degrees amps; and total reactive power is = 2623 vars, with 0.89 power factor lagging For the system, determine the magnitude of Vca in volts.
A three-phase, four wire, ABC system with a line voltage of 380 Volt, has three impedances of Z =10 /45ᴼ in aWye connection, assumed that VAB is the reference vector. Determine the line current and draw thevoltage-current phasor diagram.
165 km three-phase walking line 55 MVA transmits power at 132 kV voltage (in-phase) to the load with 0.8 reverse power factor. The series impedance of the line is (0.078 + j0.441) ohm/km and the shunt acceptance is 5.83x10^4∟900 S.(a) Calculate the generalized line constants A, B, C, and D.(b) Calculate the sender voltage and current.(c) Calculate the sending end active power, consumption power and power factor.
A 4200-V, three-phase transmission line has an impedance of 4+j ohms per phase. If it supplies a load of 1 MVA at 0.75 power factor, find: (a) the complex power (b) the power loss in the line (c) the voltage at the sending end. *Ans. S=0.75+j0.66 MVA, PL=25.14 kW and VS=4.492∠ − 1.912°kV Use four decimal places.
A short 3-phase transmission line connected to a 33kV, 50 Hz generating station at the sending end is required to supply a load of 10 MW at 0·8 lagging power factor at 30 kV at the receiving end. If the minimum transmission efficiency is to be limited to 96%, estimate the per phase value of resistance and inductance of the line. [2·4 Ω; 0·028 H]
A balanced, positive-sequence, Y-connected voltage source with Eab = 480∠0o volts is applied to abalanced-∆ load with Z∆ = 30 ∠40o Ω. The line impedance between the source and load is ZL = 1 ∠850 Ω.for each phase. Calculate the line currents, the ∆ -load currents, and the voltages at the load terminals.Recall that ZY = Z∆/3