9. A balanced three-phase source serves three loads as follows:↓Load 1: 24 kW at 0.6 lagging power factorLoad 2: 10 kW at unity power factorLoad 3: 12 kVA at 0.8 leading power factorIf the line voltage at the loads is 208 V rms at 60 Hz, we wish to determine the line current andthe combined power factor of the loads.Hint 1:↓↓active power W↓reactive power VARcomplex power=VA↓=Hint 2: SS₁ + S₁₂+S₁₂ ↓↓↓2Hint 3: S₂ =9600 - j7200 VA↓

The line current is approximately 251.68 A, and the combined power factor of the loads is…

Answered: 9. A balanced three-phase source serves…

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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Given: 1. 2 wye-connected loads per phase to a 3 phase power source 2. first load consists of a 55ohm resistance and a 0.05H inductance per phase 3. second load consumes 1kW and power factor of 0.7 lagging per phase 4. RMS of voltage across the loads are 220V, frequency 120Hz per phase 5. single phase equivalent is shown in the figure: Question: Give the value of reactive power per phase seen at load 2.
The one-line diagram of a three-phase power system is shown in the above figure. The line impedances are in per- unit on a 100-MVA base, and the line admittances are neglected. ' qu V = 1.05200 0.01+ j0.025 300 + j200 MVA 3 0.015 + j0.035 150 MW 200 + j150 MVA 0.01 + j0.03 |V = 1.03 The admittance matrix (Y_bus)? The bus power in per-unit?
A balanced delta connected load contains 8 + j4 ohms per phase, while a balanced wye connected loadconsists of 2 – j1 ohms per phase. Both loads are connected in parallel to a three-phase three-wire system inwhich the line voltage is 120 V rms at the loads. The three lines extending from the loads to the source eachhave a resistance of 0.2 ohms. Determine the power lost in the wires.a. 1.42 kW b. 1.38 kW c. 1.24 kW d. 1.83 kW ( please stay on choices, thanks) ..
Draw a 3-phase wye-connected generator with transmission lines connected to a 3-phase delta-connected load. Assume the lines connecting them have an inductance of j5 per phase. The generated voltages are 120 Vrms with phase 'a' having a phase angle of 0°. The loads are 10 Ohm resistors per phase. When drawing, make sure to label all 3 phases with voltage phasors, line inductances, and load resistances.
5. The figure below shows two star connected loads with three phase power. The voltage source is 120Z0°. The loads are Z₁ = 10 + j4 № and Z₂ = 2 +j3 №. The cables are negligible. Calculate: a) the line and phase current. b) the real power from the source. c) the reactive power of the circuit. Is V N Z₁ Z₁ Z₁ Z₂ Z₂ N N Z₂
Q1. A balanced 3 phase Y-Y connected circuit with positive sequence is as shown in the figure. 0.62 j20 1.20 jóN 68 N j46N 200 20° 200 2-120° IN 0.6N j2N m 1.20 j6 N 68 N j46 N b | 200 2120° 0.62 j2N 1.20 j6N 68 N j46 N a) Construct a single-phase equivalent circuit of the 3-phase system. b) Calculate the line currents: laa, IbB and Icc. c) Calculate the phase voltages at the load terminals: VAN, VBN and VCN. d) Calculate the line voltages at the load terminals: VAB, VBC and VCA.
Given: 1. 2 wye-connected loads per phase to a 3 phase power source 2. first load consists of a 55ohm resistance and a 0.05H inductance per phase 3. second load consumes 1kW and power factor of 0.7 lagging per phase 4. RMS of voltage across the loads are 220V, frequency 120Hz per phase 5. single phase equivalent is shown in the figure: Question: If the power factor for both loads will be changed to 0.95 lagging using a capacitor parallel to load network, what is the needed reactive power per phase to achieve the required power factor for load 1 and load 2 respectively? Give also the value of capacitace that must be added to reach the power factor for both load.
Given: 1. 2 wye-connected loads per phase to a 3 phase power source 2. first load consists of a 55ohm resistance and a 0.05H inductance per phase 3. second load consumes 1kW and power factor of 0.7 lagging per phase 4. RMS of voltage across the loads are 220V, frequency 120Hz per phase 5. single phase equivalent is shown in the figure: Question: If the power factor for both loads will be changed to 0.95 lagging using a capacitor parallel to load network, what is the needed reactive power per phase to achieve the required power factor for load 1 and load 2 respectively?
Given: 1. 2 wye-connected loads per phase to a 3 phase power source 2. first load consists of a 55ohm resistance and a 0.05H inductance per phase 3. second load consumes 1kW and power factor of 0.7 lagging per phase 4. RMS of voltage across the loads are 220V, frequency 120Hz per phase 5. single phase equivalent is shown in the figure: Question: What are the RMS line current at load 1 and 2 respectively?
In the circuit in the figure; L1 load draws 15 kVA with lagging power factor 0.6. The L2 load draws 6 kVA with a leading power factor of 0.8. According to this; What is the value of the complex power for the L2 load?
2) Figure shows three loads connected in parallel across a 1000-V (rms), 60-Hz single-phase source. Load 1: Inductive load, ... kVA, 0.28 p.f. lagging Load 2: Capacitive load, ... kW, 40 kvar Load 3: Resistive load, 15 kW Determine the total (a) kW, (b) kvar, (c) kva, and (d) supply power factor. (Please determine the power values within the specified limits: Load 1 apparent power: 100-150 kVA, Load 2 active power: 5-20 kW. By considering the power values you determined yourself, solve the question.) Load Load DE 1 2 Load 3
Given: 1. 2 wye-connected loads per phase to a 3 phase power source 2. first load consists of a 55ohm resistance and a 0.05H inductance per phase 3. second load consumes 1kW and power factor of 0.7 lagging per phase 4. RMS of voltage across the loads are 220V, frequency 120Hz per phase 5. single phase equivalent is shown in the figure: Question: What is the total power drawn from the 3 phase source?

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