SITUATION A part of an industrial plant has the following motor loads. • Two 5 MW, 11 kV, 8-pole, 0.85 leading power factor synchronous motors. • • • Two 2 MW, 6.6 kV, 730 rpm, 0.89 lagging power factor, wound-rotor induction motors. Two 1 MW, 3.3 kV, 735 rpm, 0.87 lagging power factor wound-rotor induction motors. Four 500 kW, 400 V, 1470 rpm, 0.88 lagging power factor squirrel-cage induction motors. Ten 100 HP, 400 V, 1484 rpm, 0.88 lagging power factor squirrel-cage induction motors. Twenty 20 HP, 400 V, 1460 rpm, 0.86 lagging power factor squirrel-cage induction motors. • • • Single-phase loads such as lighting, office fans, computers, etc totaling 20 kW. The plant is fed by a double-circuit 66 kV overhead line which terminates on the 66 kV bus bar in the main substation of the plant. You are required to select suitable transformers to supply the motor loads described above. Your selection should include the following: • Power rating of each transformer. • Voltage transformation ratio of each transformer. • Connection and phase shift of each transformer. • Sketch a single-line diagram showing the connection of the transformers, bus bars and motors. • Calculate the full-load current of each motor, and hence calculate the current on each side of the transformers and on all bus bars assuming all the motors are running on full-load.
SITUATION A part of an industrial plant has the following motor loads. • Two 5 MW, 11 kV, 8-pole, 0.85 leading power factor synchronous motors. • • • Two 2 MW, 6.6 kV, 730 rpm, 0.89 lagging power factor, wound-rotor induction motors. Two 1 MW, 3.3 kV, 735 rpm, 0.87 lagging power factor wound-rotor induction motors. Four 500 kW, 400 V, 1470 rpm, 0.88 lagging power factor squirrel-cage induction motors. Ten 100 HP, 400 V, 1484 rpm, 0.88 lagging power factor squirrel-cage induction motors. Twenty 20 HP, 400 V, 1460 rpm, 0.86 lagging power factor squirrel-cage induction motors. • • • Single-phase loads such as lighting, office fans, computers, etc totaling 20 kW. The plant is fed by a double-circuit 66 kV overhead line which terminates on the 66 kV bus bar in the main substation of the plant. You are required to select suitable transformers to supply the motor loads described above. Your selection should include the following: • Power rating of each transformer. • Voltage transformation ratio of each transformer. • Connection and phase shift of each transformer. • Sketch a single-line diagram showing the connection of the transformers, bus bars and motors. • Calculate the full-load current of each motor, and hence calculate the current on each side of the transformers and on all bus bars assuming all the motors are running on full-load.
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
Transcribed Image Text:SITUATION
A part of an industrial plant has the following motor loads.
•
Two 5 MW, 11 kV, 8-pole, 0.85 leading power factor synchronous motors.
•
• Two 2 MW, 6,6 kV, 730 rpm, 0.89 lagging power factor, wound-rotor induction motors.
Two 1 MW, 3.3 kV, 735 rpm, 0.87 lagging power factor wound-rotor induction motors.
Four 5:00 kW, 400 V, 1470 rpm, 0.88 lagging power factor squirrel-cage induction motors.
Ten 100 HP, 400 V, 1484 rpm, 0.88 lagging power factor squirrel-cage induction motors.
Twenty 20 HP, 400 V, 1460 rpm, 0.86 lagging power factor squirrel-cage induction
motors.
• Single-phase loads such as lighting, office fans, computers, etc totaling 20 kW.
The plant is fed by a double-circuit 66 kV overhead line which terminates on the 66 kV bus bar in
the main substation of the plant.
•
•
•
You are required to select suitable transformers to supply the motor loads described above. Your
selection should include the following:
• Power rating of each transformer.
• Voltage transformation ratio of each transformer.
•
•
·
Connection and phase shift of each transformer.
Sketch a single-line diagram showing the connection of the transformers, bus bars and
motors.
Calculate the full-load current of each motor, and hence calculate the current on each side of
the transformers and on all bus bars assuming all the motors are running on full-load.
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 4 steps
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.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,