EBK INTRODUCTORY CIRCUIT ANALYSIS
13th Edition
ISBN: 8220100668234
Author: Boylestad
Publisher: PEARSON
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Chapter 24, Problem 34P
Find the total watts, volt-amperes reactive, volt-amperes, and Fp of the three-phase system in Problem 13.
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The load connected to a 3-phase supply comprises three similar coils connected in star. The line currents are 22 A and the kVA rating and power input are 25 kVA and 12 kW respectively. (a) Find the line and phase voltage. (b) If the coils are now connected in delta to the same three phase supply, calculate the line current and phase current
A balanced star load with impedances of 6∟45o ohms is connected to a three-phase, four-wire, 208 volt, ABC system. Find the line currents, the neutral current, the power per phase and the total power (S, P, Q).
In 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.
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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- Obtain the readings of two wattmeter’s in a three-phase, three-wire system having effective line voltage of 240 V. The load is a balanced delta connected load impedance of 20 cis 80° ohms.arrow_forwardering 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_forwardA 3 phase 13-KV transmission line delivers 8 MVA of load. The per phase impedance of the line is (0.01 + j 0.05 ) p.u. referred to a 13 – KV, 8 – MVA base. What is the voltage drop across the line?arrow_forward
- 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) Answerarrow_forwardTwo wattmeters are used to measure the total power drawn by a balaced delta connected load. If the wattmeters read 1200 W and 800 W respectively, and the line to line voltage is 208 V, solve for the impedance per phase of the load.arrow_forwardA balanced delta-connected load has phase impedances of 4+j3 Ohms. It is connected to balanced transmission lines, with Vab = 1.5kV @ 15 degrees. a) What is the current through each of the load phases? b) What is the current through each of the transmission lines? c) Which ACSR cable should be used for these transmission lines to give a 20% current rating margin for this load?arrow_forward
- The c-phase voltage of a balanced three-phase Y-connected system is 450 −25° V. If the phase sequence is negative, what is the value of VAB?arrow_forwardA 400V three-phase, four wire system has the following loads connected: Phase 3: load impedance Z3 = 15 – j20 Ω Draw the circuit diagram and determine: The line and phase voltages for phase 3 (including phase angles) The line and phase currents for for phase 3 (including phase angles) The neutral current (including phase angle)arrow_forwardA 3-phase 415, 50Hz supply is given to delta connected load with impedance (6+j14) ohms. The line current isarrow_forward
- 28. 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_forwardThree identical impedances of 15Ð60°W are connected in star to a three-phase, three-wire, 240 volt system. The lines between the supply and the load have impedances of 2 + j ohms. Find the voltage magnitude at the load.arrow_forwardThree 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_forward
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