Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 26, Problem 3PA
You are an electrician working in an industrial plant. A 30-hp three-phase induction motor has a current draw of 36 amperes at full load. The motor is connected to a 480-volt line. A three-phase wattmeter indicates a true power of 22 kW. Determine the power factor of the motor and the amount of capacitance needed to correct the power factor to
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A single-phase motor takes 10A at a power factor of 0.7 lagging when connected to a 230V, 50 Hz supply. A capacitor bank is connected in parallel with the motor to raise the power factor to unity.i) Draw the phasor diagram before and after power factor correction with the supply voltage taken as the reference phasor. ii) Calculate the percentage change in the supply current after power factor correction.iii) Calculate the value of capacitance required.
A 500-V, 50-Hz single-phase motor takes a full load current of 50 A at a pf of 0.959 lagging. What capacitance must be placed in parallel with the motor to raise the pf to unity?
Question 1. An industrial load consisting of a set of induction motors connected to a 220 V, 60 Hz single phase source consumes 50 kW with a back power factor of 0.8. The power factor will be increased back to 0.95 by connecting a set of capacitors in parallel. For this, calculate the VA value that the connected capacitor will provide.
Chapter 26 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 26 - How many degrees out of phase with each other are...Ch. 26 - What are the two main types of three-phase...Ch. 26 - A wye-connected load has a voltage of 480 V...Ch. 26 - A wye-connected load has a phase current of 25 A....Ch. 26 - A delta connection has a voltage of 560 V...Ch. 26 - A delta connection has 30 A of current flowing...Ch. 26 - A three-phase load has a phase voltage of 240 V...Ch. 26 - If the load in Question 7 is connected in a wye,...Ch. 26 - An alternator with a line voltage of 2400 V...Ch. 26 - What is the apparent power of the circuit in...
Ch. 26 - You are working in an industrial plant. A bank of...Ch. 26 - You are a journeyman electrician working in an...Ch. 26 - You are an electrician working in an industrial...Ch. 26 - Refer to the circuit shown in Figure 26-19 to...Ch. 26 - Refer to the circuit shown in Figure 26-20 to...Ch. 26 - Refer to the circuit shown in Figure 26-21 to...Ch. 26 - Refer to the circuit shown in Figure 26-22 to...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- An industrial plant consisting primarily of induction motor loads absorbs 500 kW at 0.6 power factor lagging. (a) Compute the required kVA rating of a shunt capacitor to improve the power factor to 0.9 lagging. (b) Calculate the resulting power factor if a synchronous motor rated at 500 hp with 90 efficiency operating at rated load and at unity power factor is added to the plant instead of the capacitor. Assume constant voltage (1hp=0.746kW).arrow_forwardA single-phase motor draws 180 W at a power factor of 0.8 lagging when connected across a 240 Vrms, 60-Hz source. A capacitor is connected in parallel with the load to produce a unity power factor. Determine the required capacitance. The required capacitance = ____ μF.arrow_forwardThe current in a pure capacitor circuit is i=0.17cos500t. If the rms value of the impressed emf is 80 volts. a) What are the equation for the voltage and power? b) What is the circuit frequency?arrow_forward
- An impedance coil having a resistance of 15 ohms and an inductance of 0.08 henryis connected in series with a variable capacitor. If a 117 volt 60 cps source isconnected to the circuit, what will be the capacitance of the capacitor and the current(a) when the circuit has a power factor of 0.866 leading and (b) when the voltagedrop across the coil is equal to the voltage drop across the capacitor?arrow_forwardA 150 – microfarad capacitor is connected to a 220 – volt, 60 – cycle source. Calculate (a) the capacitive reactance, (b) the current in the circuit, (c) the average power taken by the capacitor, and (d) the maximum power delivered to the capacitor. DRAW THE PHASOR DIAGRAM IF POSSIBLE. ROUND OFF TO FOUR DECIMAL PLACESarrow_forwardA 400-V, 3-phase induction motor load takes 900 kVA at a power factor of 0.707. Calculate the KVA rating of the capacitor bank to raise the resultant power factor of the installation of 0.866 lagging. Find also the resultant power factor when the capacitors are in circuit and the motor load has fallen to 300 kVA at 0.5 power factor.arrow_forward
- A 240 rms 60 Hz source supplies a parallel combination of a 4.5-kW heater and a 27-kVA inductor motor whose power factor is 0.82. Determine the kVA rating of the capacitor required to adjust the system power factor to 0.9 lagging and the value of the capacitor required?arrow_forwardA series circuit consisting of a resistor that dissipates 640watts, a coil and an ideal capacitor is connected across a 220volts, 60Hz power supply. The current drawn by the load is 8 amperes. The voltage across the coil is 150 volts and its power factor is 0.8 lagging. Determine: a. the resistance of the resistor (10 Ohms)b. the resistance and the inductance of the coil ( 15 Ohms, 29.8416 mH)c. the voltage across the capacitor (181.6515 V)d. the capacitance of the capacitor (116.8207 μF)arrow_forwardThe load of an industrial concern is 400 kVA at a power factor of 75 percent, lagging. An additional motor load of 100 kW is needed. What is the new kilovoltampere load and power factor of the load if the motor to be added is ... an induction motor with a power factor of 90 percent, lagging? A) kVA a) 450.1 kVA b) 507.8 kVA c) 623.2 kVA d) none of the above B) Power Factor a) 78.7 % lagging b) 83.4 % lagging c) 93.5 % leading d) none of the above ... a synchronous motor with an 80 percent power factor, leading? C) kVA a) 442.5 kVA b) 305.4 kVA c) 236.3 kVA d) none of the above D) Power Factor a) 63.3 % lagging b) 81.9 % lagging c) 90.3 % leading d) none of the above E) What must be the power factor of the added 100-kW load if it were to improve the overall plant power factor to 100 percent? a) 93.8 % leading b) 77.1 % leading c) 35.4 % leading d) none of the abovearrow_forward
- A series circuit consisting of a 50 – ohm resistor, 0.5 – henry inductor, and a 100 – microfarad capacitor is connected to a 110 – volt, 50 cycle source. Calculate the following: a.) TOTAL IMPEDANCE b.) CURRENT c.) VOLTAGE DROP ACROSS THE RESISTOR d.) VOLTAGE DROP ACROSS THE INDUCTOR e.) VOLTAGE DROP ACROSS THE CAPACITOR f.) AVERAGE POWER g.) APPARENT POWER h.) REACTIVE POWER i.) POWER FACTOR j.) POWER FACTOR ANGLE DRAW THE PHASOR DIAGRAM IF POSSIBLE AND ROUND OFF TO FOUR DECIMAL PLACESarrow_forwardA 150 microfarad capacitor is connected to a 220 - volt, 60 - cycle source. Calculate (a) the capacitive reactance, (b) the current in the circuit, (c) the average power taken by the capacitor, and (d) the maximum power delivered to the capacitor.arrow_forwardA 3-phase, 8-pole, 60-Hz, star-connected alternator has 96 slots with 10 turns per coil. The coil span is 10 slots. 60o groups, 2-layer winding is used. All coils in a phase are connected in series. (a)Find the total number of coil groups in the machine. (b)Find the total number of coils in the machine, C. (c)Find the number of coils in a coil group, m. (d)Find the number of turns per phase, Tph. (e)Given that the upper side of coil 1 lies in slot 1, find the following slots: (i) the slot which carries the lower side of coil 1 (ii)the slot which carries the lower side of coil 90 (f)Give the numbers of the following coils: (i)all coils forming coil group 1 [ i.e. the first group named A] of phase A winding (ii)all coils forming coil group 2 [ i.e. the first group named A’] of phase A winding (g)Calculate the distribution and coil span factors. (i)Calculate the phase voltage on no load, when the air-gap flux per pole is 0.05 Wb.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Power System Analysis and Design (MindTap Course ...
Electrical Engineering
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:Cengage Learning
Working of Synchronous Motor; Author: Lesics;https://www.youtube.com/watch?v=Vk2jDXxZIhs;License: Standard Youtube License