12.31 Abalanced delta-connected load is supplied by a 60-Hz three-phase source with a line voltage of 240 V. Each load phase draws 6 kW at a lagging power factor of 0.8. Find: (a) the load impedance per phase (b) the line current (c) the value of capacitance needed to be connected in parallel with each load phase to minimize the current from the source

12.31 Abalanced delta-connected load is supplied by a 60-Hz three-phase source with a line voltage of 240 V. Each load phase draws 6 kW at a lagging power factor of 0.8. Find: (a) the load impedance per phase (b) the line current (c) the value of capacitance needed to be connected in parallel with each load phase to minimize the current from the source

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

A delta connected load of impedances (6 + j9) ohms each is supplied through a line having an impedance of (1 + j2) ohms. The supply voltage is balanced 3-phase, 400 V, 60 Hz mains. Find the total power drawn by the load.
A 200 V single phase circuit has an apparent power of 5 KVA and reactive power of 4 KVAr. Then find (i) power factor (ii) impedance (iii) resistance (iv) reactance.
Subject - Design electrical circuits for single phase AC networks Question - Analyse the methods that improve the power factor of a electrical circuit.
Give your background about the AC systems from single phase and three phase systems to their connections including their currents and voltages laws with the suitable diagrams.
Power factor correction is a method to do which of the following.
In an installation there is a three-phase load of 300 kVA with a power factor of 0.8 behind, in parallel with a three-phase load of 150 kVA with a power factor of 0.6 ahead. A pure reactive element is connected in parallel, and a unity power factor is obtained at the power input. Indicate the reactant of the element, with a positive sign if it is a bank of reactors, or with a negative sign if it is a bank of capacitors. Just put the corresponding sign followed by the numerical value, without units. The numerical value must correspond to the three-phase kVARS. You can use integer values with no decimal places or up to two decimal places
The following loads are served by a balanced three-phase source: Load 1: 18 kVA at 0.8 pf lagging Load 2: 8 kVA at 0.8 pf leading Load 3: 12 kVA at 0.75 pf lagging. Give the complex power expression for Load 3. Select one: O a. 29.80 +j13.94 O b. O c. 9.00+ j7.94 kVA 6.40 -j4.80 KVA O d. 32.90225.07° KVA O e. 14.40 +j10.80 kVA
Three Impedances each of (9 - j18)N are connected in mesh across a three-phase 415V ac supply. Determine the phase current, line current, active power, reactive power drawn from supply. Also draw the Phasor diagram for the mesh connection and marks the Line current ,phase current line voltage and phase angle between phase current and pahse voltage. phase current (Ip) Line current real power reactive power
c) Drive the expression for maximum phase leads of m given network V. in R₁ min C₁ wwww R2
A load of 138+j460 Ohm is supplied through 3+j14 Ohm line as shown in Figure 1. (a) Find the average power dissipated in the line. (b) Find the value of capacitive reactance connected across the load to compensate the reactive power need of the load. (c) What is the equivalent impedance after compensation. (d) Find the average power dissipated in the line when the capacitive reactance is connected across the load. (e) Express the power loss in (d) as a percentage of the power found in (a) j14 Figure 1 7200/0 + V (rms) Source 3 wi Line Load 138 j460
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.
The 3-phase power equation in terms of phase voltage and phase current is /3VplpCoso 3VplpCoso