EBK INTRODUCTORY CIRCUIT ANALYSIS
13th Edition
ISBN: 9780100668232
Author: Boylestad
Publisher: YUZU
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Chapter 24, Problem 39P
To determine
The value of total watts, volt-ampere reactive, volt ampere and power factor
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1. A three-phase, four wire, ABC system with an a line voltage of 200 Volt, has three impedances of 25
/45ᴼ in a Delta connection. Determine the line current, true power, reactive power and apparent
power and draw the voltage-current phasor diagram.
31. A 3-phase 3-wire star-connected load consists of a capacitive reactance of 100ohm in the red phase and a resistor of 100ohm in Bo- each of the other phases. The line voltage is 440 V and the phase sequence is RYB. If the power is measured by the 2-wattmeter method,the current coils being connected in the red and yellow leads respectively, determine the reading of each instrument. (-86.5 W, 1.640 W) Answer
Three identical coils, each having a resistance of 20Ω and a reactance of 20 Ω are connected in (a)star (b)delta across 440 v ,three phase line. Calculate for each method of connection the line current, power consumed by each phase impedance and readings on each of the two wattmeters to measure the power.
Chapter 24 Solutions
EBK INTRODUCTORY CIRCUIT ANALYSIS
Ch. 24 - A balanced V load having a 10 resistance in each...Ch. 24 - Repeat Problem 1 if each phase impedance is...Ch. 24 - Repeat Problem 1 if each phase impedance is...Ch. 24 - The phase sequence for the Y-Y system in Fig....Ch. 24 - Repeat Problem 4 if each phase impedance are...Ch. 24 - Repeat Problem 4 if each phase impedance is...Ch. 24 - For the system in Fig. 24.43, find the magnitude...Ch. 24 - Computer the magnitude of the voltage EAB for the...Ch. 24 - For the Y-Y system in Fig. 24.45: a. Find the...Ch. 24 - For the Y-Y system of Fig. 24.46 the impedance of...
Ch. 24 - A balanced load having a 20 resistance in each...Ch. 24 - Repeat Problem 11 if each phase impedance is...Ch. 24 - Repeat Problem 11 if each phase impedance is...Ch. 24 - The phase sequence for the Y- system in Fig....Ch. 24 - Repeat Problem 14 if each phase impedance is...Ch. 24 - Repeat Problem 14 if each phase impedance are...Ch. 24 - Prob. 17PCh. 24 - For the connected load in Fig. 24.49: a. Find the...Ch. 24 - A balanced V load having a 30 resistance in each...Ch. 24 - Repeat Problem 19 if each phase impedance is...Ch. 24 - Prob. 21PCh. 24 - Prob. 22PCh. 24 - Prob. 23PCh. 24 - Repeat Problem 22 if each phase impedance is...Ch. 24 - Prob. 25PCh. 24 - Prob. 26PCh. 24 - Prob. 27PCh. 24 - The phase sequence for the - system in Fig....Ch. 24 - Repeat Problem 28 if each phase impedance is...Ch. 24 - Repeat Problem 28 if each phase impedance is...Ch. 24 - Prob. 31PCh. 24 - Prob. 32PCh. 24 - Prob. 33PCh. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - Prob. 35PCh. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - Prob. 38PCh. 24 - Prob. 39PCh. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - A balanced, three-phase, -connected load has a...Ch. 24 - A balanced, three-phase, Y-connected load has a...Ch. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - The Y-Y system in Fig. 24.53 has a balanced load...Ch. 24 - Prob. 45PCh. 24 - Prob. 46PCh. 24 - Repeat Problem 46 for the network in Fig. 24.47.Ch. 24 - For the three-wire system in Fig. 24.55, properly...Ch. 24 - Sketch three different ways that two wattmeters...Ch. 24 - For the Y- system in Fig. 24.56: Determine the...Ch. 24 - For the system in Fig. 24.57: Calculate the...Ch. 24 - For the three-phase, three-wire system in Fig....
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- Three loads, each with resistance 40Ω , are star connected to a 363.73V , 3-phase supply. a) Determine the phase voltage of the system b) Determine the phase current c) Determine the line currentarrow_forward28. The impedances are mesh-connected to a symmetrical three-phase, 40-V, 50, Hz supply of phase sequence RYB. Z1=(5+j10)ohm is connected between lines R and Y Z2=(5+j5)ohm is connected between lines Y and B Z3= (6+j4)ohm is connected between lines 8 and R. Two wattmeters connected to measure input have their current coils in lines R and Y respectively. Calculate the line currents and the wattmeter readings. (195.5 A, 79.4 A, 43.4 A; 39.8 kW, 9.6 kW] Answers.arrow_forwardIn the balanced three-phase circuit shown, the current coil of the wattmeter is connected in line aA, and the potential coil of the wattmeter is connected across lines b and c. Show that the wattmeter reading multiplied by 3 equals the total reactive power associated with the load. The phase sequence is positive.arrow_forward
- ering questions and answers /... Question: Two wattmeters in a 3 phase, 3-wire system with a effective line voltage of 120V read 1500W and 500w then inpedence in a balanced delta connectionarrow_forward1. Solve the following problem: A THREE-PHASE CIRCUIT WHERE THE BALANCED DELTA LOAD OF 36 + J54 OHMS IS SUPPLIED BY 8,602 OHMS IMPEDANCE CONDUCTORS WITH A PHASE ANGLE OF 54,462 DEGREES. IF THE GENERATOR VOLTAGE IN PHASE B IS 100 VOLTS ANGLE - 120 DEGREES. CALCULATE: A) THE VOLTAGE BC IN LOAD. B) THE POWERS IN THE CONDUCTORS. C) THE POWER TRIANGLE IN THE LOAD.arrow_forwardA balanced 3-phase load draws 120 amperes line current at 230 volts line to line, 0.848 pf lagging current. Solve for the real power.arrow_forward
- A single phase line is transmitting 1,100KW power to a factory at 11KV and at 0.8 pf lagging. It has a total resistance of 2 ohm and a loop reactance of 3 ohm. Determine (i) the voltage at the sending end, (ii) percentage regulation and (iii) transmission efficiency.arrow_forward1.) A three phase, 3 wire CBA system, with the line voltage Vab =300cis0°,has the following line currents: Ia= 60cis120°, Ib= 62cis-45°,Ic= 15.5cis220° Find the readings of wattmeters in lines a.) A and B b.) B and C C.) A and Carrow_forwardPlease help me with this problem... Question: For the three-phase, a three-wire system of Fig. 22.52, find the magnitude of the current through each phase of the load and find the total watts, volt-amperes reactive, volt-amperes, and Fp of the load.arrow_forward
- A three phase balanced load having a power factor of 0.52 lagging draws a line current of 25A at 220V. If the two watt-meter method is used to measure the total power consumed, determine the reading of each wattmeter.arrow_forwardA three phase transmission line to line capacitive reactance value is 12 ohms. If the charging current of a line per phase is 37 A. Choose the corresponding phase voltage from the values given below. 21.07V 0.32V 444.00V 256.34Varrow_forward1. a) Find the reading of each wattmeter in the circuit shown if ZA=20 30° Ω, ZB=60 0° Ω, and ZC=40 −30° Ω. 2. b) Show that the sum of the wattmeter readings equals the total average power delivered to the unbalanced three-phase load.arrow_forward
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