Problem #4 A 460-V,4-pole, 50-hp,60-Hz, Y-connected, three-phase induction motor develops its full-load induced torque at 3.8% slip when operating at 60 Hz and 460 V. The per-phase circuit model impedances of the motor are: Ri=0.33 Ohms X1=0.42 Ohms Xm=30.0 Ohms X2=0.42 Ohms Mechanical, core, and stray losses may be neglected in this problem. a. Find the value of the rotor resistance. b. Find Tmax, SmaxT, and the rotor speed at maximum torque for this motor. c. Find the starting torque of this motor d. What starting code letter should be assigned to this motor? Problem #5 Answer the following questions about the motor in problem 4. a. If the motor is started from a 460-V source, how much current will flow in the motor at starting? b. If transmission line with an impedance of 0.35+j0.25 Ohms per phase is used to connect the induction motor to the source, what will the starting current of the motor be? What will the motor's terminal voltage be on starting? c. If an ideal 1.4:1 step-down autotransformer is connected between the transmission line and the motor, what will the current be in the transmission line during starting? What will the voltage be at the motor end of the transmission line during starting?
Problem #4 A 460-V,4-pole, 50-hp,60-Hz, Y-connected, three-phase induction motor develops its full-load induced torque at 3.8% slip when operating at 60 Hz and 460 V. The per-phase circuit model impedances of the motor are: Ri=0.33 Ohms X1=0.42 Ohms Xm=30.0 Ohms X2=0.42 Ohms Mechanical, core, and stray losses may be neglected in this problem. a. Find the value of the rotor resistance. b. Find Tmax, SmaxT, and the rotor speed at maximum torque for this motor. c. Find the starting torque of this motor d. What starting code letter should be assigned to this motor? Problem #5 Answer the following questions about the motor in problem 4. a. If the motor is started from a 460-V source, how much current will flow in the motor at starting? b. If transmission line with an impedance of 0.35+j0.25 Ohms per phase is used to connect the induction motor to the source, what will the starting current of the motor be? What will the motor's terminal voltage be on starting? c. If an ideal 1.4:1 step-down autotransformer is connected between the transmission line and the motor, what will the current be in the transmission line during starting? What will the voltage be at the motor end of the transmission line during starting?
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...
Related questions
Question
im curious about #5 but its based on #4!
Transcribed Image Text:Problem #4
A 460-V,4-pole, 50-hp,60-Hz, Y-connected, three-phase induction motor
develops its full-load induced torque at 3.8% slip when operating at 60 Hz and
460 V. The per-phase circuit model impedances of the motor are:
Ri=0.33 Ohms
X1=0.42 Ohms
Xm=30.0 Ohms
X2=0.42 Ohms
Mechanical, core, and stray losses may be neglected in this problem.
a. Find the value of the rotor resistance.
b. Find Tmax, SmaxT, and the rotor speed at maximum torque for this motor.
c. Find the starting torque of this motor
d. What starting code letter should be assigned to this motor?
Problem #5
Answer the following questions about the motor in problem 4.
a. If the motor is started from a 460-V source, how much current will flow in the
motor at starting?
b. If transmission line with an impedance of 0.35+j0.25 Ohms per phase is used
to connect the induction motor to the source, what will the starting current of
the motor be? What will the motor's terminal voltage be on starting?
c. If an ideal 1.4:1 step-down autotransformer is connected between the
transmission line and the motor, what will the current be in the transmission
line during starting? What will the voltage be at the motor end of the
transmission line during starting?
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 2 steps
Recommended textbooks for you
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
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,