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
Textbook Question
Chapter 32, Problem 2PA
You have been given the task of connecting a nine-lead three-phase dual-voltage motor to a 240-V line. You discover that the nameplate has been painted and you cannot see the connection diagram. To make the proper connections, you must know if the motor stator winding is connected wye or delta. How could you determine this using an ohmmeter? Explain your answer.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
A 400V, 60HZ, 6-pole wye connected , 30 induction motor draws 75KW with a line
current of 100A. The core loss is 2KW, Friction and Windage loss is 1.2KW. The stator
resistance between two terminals is 0.352. What is the efficiency if the motor runs at a
slip of 2.5%?
S2) please hury up its late
can you answer this thank
Chapter 32 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 32 - What are the three basic types of three-phase...Ch. 32 - What is the principle of operation of all...Ch. 32 - What is synchronous speed?Ch. 32 - What two factors determine synchronous speed?Ch. 32 - Prob. 5RQCh. 32 - Name three factors that determine the torque...Ch. 32 - Is the synchronous motor an induction motor?Ch. 32 - Prob. 8RQCh. 32 - Why must a synchronous motor never be started when...Ch. 32 - Name three characteristics that make the...
Ch. 32 - What is the function of the field-discharge...Ch. 32 - Why can an induction motor never operate at...Ch. 32 - A squirrel-cage induction motor is operating at...Ch. 32 - Prob. 14RQCh. 32 - Prob. 15RQCh. 32 - Prob. 16RQCh. 32 - Name three factors that determine the amount of...Ch. 32 - Why will the rotor of a wound-rotor motor not turn...Ch. 32 - Why is the starting torque per A of starting...Ch. 32 - When is a synchronous motor a synchronous...Ch. 32 - What determines when a synchronous motor is at...Ch. 32 - How can a synchronous motor be made to have a...Ch. 32 - Is the excitation current of a synchronous motor...Ch. 32 - Prob. 24RQCh. 32 - Prob. 25RQCh. 32 - You are working as a plant electrician. It is your...Ch. 32 - You have been given the task of connecting a...Ch. 32 - You are an electrician working in an industrial...
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
- 4-What is the main function of a diverter used in series wound DC motor? 5- What is the main difference between (iron and friction losses) and copper (Cu) losses in DC generators? 05arrow_forwardA 150 HP, 3-phase, 6 pole, 460 V, 60 Hz induction motor draws 195 A line current at full load speed of 1170 rpm and 0.85 pf. Solve for the percent slip at full load. (a). 2.5% (b). 3.0% (c). 2.8% (d). 2.0%arrow_forwardi need the answer quicklyarrow_forward
- (2) lehäi Q5// A 4 pole lap - winding dc shunt generator has an armature winding consisting of 220 turns each of 0.004 ohm. the armature resistance * is 0.5 ohm 1 ohm O 0.025 ohm O 0.055 ohm O (2) abäi Q6// in shunt circuit output to * input is Vla/Eala VIL/Eala Eala/Vla none of the above Oarrow_forwardA 110 V, 60 Hz, 6 — pole single phase induction motor 1/3 hp has the following equivalent circuit impedances: RI = 1.52 ohm, R2 = 3.13 ohm and xl =2.10 ohm, x2 =1.56 ohm. Xm=58.2 ohm, The friction, windage and stry losses =16W, the core loss = 35 W. For a slip of 0.05, calculate (a) input current, (b) power factor, (c) developed power, (d) output power, (e) speed (f) in put power (g) air gab power (h) T ind (i) T load (j) efficiency.arrow_forward1. A 690-V, six-pole A-connected induction motor runs at 1085 rpm when operating at a full load. Assume the friction and windage losses are 2.9 kW and core losses are 3.1kW. the motor parameters are: R₁ = 0.06 Ohm, R2 = 0.05 Ohm, X₁ = 0.21 Ohm, X₂ 0.19 Ohm, Xm = 18.5 Ohm. = a. Find the speed of the motor in both rpm and rad/sec. b. Find the air-gap power. c. Find the motor efficiency. 2. For the motor of problem 1 (top problem), find the following: a. Find the maximum torque and the slip in which it happens. What is the rotor speed at this slip in rpm? b. Find the start-up torque. c. Find the rotor resistance which would result in maximum torque occurring at the rotor speed of 950 rpm.arrow_forward
- A four-pole induction motor drives a load at 2478 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit Part B Value I = HA Request Answer Submit If the dc-to-ac converter has a power efficiency of 90 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. HÅ Value Units Request Answer ? Units ?arrow_forwardQ2: b- Explain how does the three- phase induction motor work? *arrow_forwardA 3-phase star connected, 440 V (line to line) 50 Hz 8 pole induction motor has the following has the following constants in ohms per phase referred to stator: R1=0.1 Ohm, X1=0.33 ohm, R2’=0.17 ohm, X2’= 0.3 ohm, Xm=15 ohms. Find rotor current referred to stator and stator current when motor is running with 700 rpm.arrow_forward
- A 480-V, 25-hp, 50-Hz, Six-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R₁ = 0.75 92, R₂ = 0.45 2, X₁=0.9 92, X₂ = 0.5 , XM = 20 92. The total rotational losses are 950 W and are assumed to be constant. The core loss is 100 W. For a rotor slip of 4 percent at the rated voltage and rated frequency, find the motor's (a) Rotor mechanical Speed in (rad/sec). (d) Pcony and Pout. (e) Tind and Tload. (b) Stator current. (c) Power factor. (f) Efficiency.arrow_forwardA 110 V, 60 Hz, 6 – pole single phase induction motor 1/3 hp has the following equivalent circuit impedances: RI = 1.52 ohm, R2 = 3.13 ohm and x1 =2.10 ohm, x2 =1.56 ohm. Xm=58.2 ohm, The Friction, windage and stry losses =16W, the core loss = 35 W, For a slip of 0.05, calculation (a) input current, (b) power factor, (c) developed power, (d) output power, (e) speed (f) in put power (g) air gab power (h) T ind (i) T load 6) efficiency.arrow_forwardA 50-hp three-phase motor, rated 220 V, 75% power factor has 6 poles. The slip at full load is 3%. What is the frequency of the rotor current at full load? (a). 1.8 Hz (b). 60 Hz (c). 5.4 Hz (d). 58.2 Hzarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Introductory Circuit Analysis (13th Edition)Electrical EngineeringISBN:9780133923605Author:Robert L. BoylestadPublisher:PEARSONDelmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage LearningProgrammable Logic ControllersElectrical EngineeringISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
- Fundamentals of Electric CircuitsElectrical EngineeringISBN:9780078028229Author:Charles K Alexander, Matthew SadikuPublisher:McGraw-Hill EducationElectric Circuits. (11th Edition)Electrical EngineeringISBN:9780134746968Author:James W. Nilsson, Susan RiedelPublisher:PEARSONEngineering ElectromagneticsElectrical EngineeringISBN:9780078028151Author:Hayt, William H. (william Hart), Jr, BUCK, John A.Publisher:Mcgraw-hill Education,
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:PEARSON
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Programmable Logic Controllers
Electrical Engineering
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:9780078028229
Author:Charles K Alexander, Matthew Sadiku
Publisher:McGraw-Hill Education
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:9780134746968
Author:James W. Nilsson, Susan Riedel
Publisher:PEARSON
Engineering Electromagnetics
Electrical Engineering
ISBN:9780078028151
Author:Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:Mcgraw-hill Education,
How does a Transformer work - Working Principle electrical engineering; Author: The Engineering Mindset;https://www.youtube.com/watch?v=UchitHGF4n8;License: Standard Youtube License