Q2. A three-phase line has an impedance of 3 + j4 N as shown in fig. 2. The line feeds a Y-connected balanced load with an 3+ j4N a A impedance of 60 + j80 N per phase. The line is energized at the sending end from a three-phase balanced supply of line voltage 415.7 V. Taking the phase voltage Va as reference, determine a) power drawn from the supply, b) c) d) uwww 60N |VL] = 415.7 V j800 the current, real power and reactive В ww m the line voltage at the load, the current per phase in the load, the total real and reactive power in the load and the line. Fig. 2.

Q2. A three-phase line has an impedance of 3 + j4 N as shown in fig. 2. The line feeds a Y-connected balanced load with an 3+ j4N a A impedance of 60 + j80 N per phase. The line is energized at the sending end from a three-phase balanced supply of line voltage 415.7 V. Taking the phase voltage Va as reference, determine a) power drawn from the supply, b) c) d) uwww 60N |VL] = 415.7 V j800 the current, real power and reactive В ww m the line voltage at the load, the current per phase in the load, the total real and reactive power in the load and the line. Fig. 2.

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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Q3: The Y-connected source in figure feeds a delta-connection load through a distribution line having an impedance of1+jl Q/o. The load impedance is 118 + 185 2/0 Use the a-phase internal voltage of the generator as the reference a) Construct a single phase equivalent cireuit of the 3-J0 system. b) Calculate the line currents las Ipa and Ie. c) Calculate the phase voltages at the load terminals. d) Claculate the phase currents of the load. e) Calculate the line voltages at the source terminals
Q2 (a) Based on the relationship between the line and phase value of currents and voltage, show that the active power input to a three-phase balance load is v3VIcose, where V and I are line quantities. (b) A balanced Y-connected load has phase voltage of 230 V and positive phase sequence. The impedances Za, Za, and Zc are 10230° N, respectively. (i) By taking VaB on the load side as a reference, determine all the line currents and phase voltages and line voltages. (ii) Determine total real power, P, total reactive power, Q and total apparent power, S of the system. (iii) Total real power of the loads can be measured using two wattmeter methods. Draw the connection of the two wattmeters if their current coils are in line A 111 and C, respectively. What is the total real power measured by each wattmeter? Prove and compare the value with Q2(b)(ii).
Q2 (a) Based on the relationship between the line and phase value of currents and voltage, show that the active power input to a three-phase balance load is v3VIcoso, where V and I are line quantities. (b) A balanced Y-connected load has phase voltage of 230 V and positive phase sequence. The impedances Za, ZB, and Zc are 10430° n, respectively. (i) By taking VaB on the load side as a reference, determine all the line currents and phase voltages. (i1) Determine total real power, P, total reactive power, Q and total apparent power, S of the system. (111) Total real power of the loads can be measured using two wattmeter methods. Draw the connection of the two wattmeters if their current coils are in line A and C, respectively. What is the total real power measured by each wattmeter? Prove and compare the value with Q2(b)(i).
H5
Course: Electrical Engineering Subject: Electrical Apparatus Instructions: Write the GIVEN with their respective symbols and units. • Do not skip the SOLUTIONS, do it step-by-step with their respective symbols and units • Round up to 3 three decimal places the FINAL ANSWERS and BOX it. Problem: An abc-phase sequence three-phase balanced wye-connected source supplies power to a balanced delta-connected load. The impedance per phase in the load is 14 + j12 Q. If the source voltage for a phase is Van=120280° Vrms, and the line impedance is zero, find the phase currents in the wye-connected source.
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In Y-Y three-phase system, the following loads are served by a balanced source: Load #1: 20 kVA at PF = 0.8 lagging Load #2: 4 kVA at PF = 0.8 leading Load #3: 10 kVA at PF = 0.75 lagging The load voltage is 208 Vrms at 60 Hz. If the line impedance is negligible, find the power factor at the source.
Solve only part c
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A balanced 3-phase load of 30 MW is supplied at 136.6 kV and 0.85 pf lagging by means of transmission line. The sending end voltage is 138.9 kV. The value of constant A is 0.9. Find the %regulation of the transmission line
A balanced 3-phase load of 23.5 MVA with PF=0.85 lagging is supplied with a balanced 3-phase source of 12.5 kV (line-to-line). Determine: 1. VLL, IL, and VLN; 2. The phase angle between phase voltage and current, 0, 3. S3p, S3p, P3p, and Q3p, 4. Zy if load is wye and Za if load is delta, 5. What size capacitor bank (in KVAR) would need to be installed to increase the PF to 0.9 lagging.