1. You are working as a plant electrician. It is your job to install a 300-hp three-phase squirrel-cage induction motor. The supply voltage is 480 V. The power company has determined that the maximum amount of starting current that can be permitted by any motor in the plant is 3000 A. The motor nameplate is as follows: Phase: 3 FLA: 352 Volts: 480 RPM: 1755 Frame: XXX Code: L Will it be possible to start this motor across the line, or will it be necessary to use a reduced-voltage starter to reduce starting current?

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 1PA: You are working as a plant electrician. It is your job to install a 300-hp three-phase squirrel-cage...
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Unit 32 Practical Applications
PRACTICAL APPLICATIONS
1. You are working as a plant electrician. It is your job to install a 300-hp three-phase squirrel-cage
induction motor. The supply voltage is 480 V. The power company has determined that the maximum
amount of starting current that can be permitted by any motor in the plant is 3000 A. The motor
nameplate is as follows:
Phase: 3
FLA: 352
Volts: 480
RPM: 1755
Frame: XXX
Code: L
Will it be possible to start this motor across the line, or will it be necessary to use a reduced-voltage
starter to reduce starting current?
2. 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.
3. You are an electrician working in an industrial plant.
tripping out on overload. The motor is connected to a 240-volt line. Voltage measurements indicate the
following voltages between the different phases: A-B = 276 volts, B-C = 221 volts, and A-C = 267 volts.
Determine the percentage of heat rise in the winding with the highest current.
30-hp three-phase squirrel-cage motor keeps
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Submit
Transcribed Image Text:Unit 32 Practical Applications PRACTICAL APPLICATIONS 1. You are working as a plant electrician. It is your job to install a 300-hp three-phase squirrel-cage induction motor. The supply voltage is 480 V. The power company has determined that the maximum amount of starting current that can be permitted by any motor in the plant is 3000 A. The motor nameplate is as follows: Phase: 3 FLA: 352 Volts: 480 RPM: 1755 Frame: XXX Code: L Will it be possible to start this motor across the line, or will it be necessary to use a reduced-voltage starter to reduce starting current? 2. 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. 3. You are an electrician working in an industrial plant. tripping out on overload. The motor is connected to a 240-volt line. Voltage measurements indicate the following voltages between the different phases: A-B = 276 volts, B-C = 221 volts, and A-C = 267 volts. Determine the percentage of heat rise in the winding with the highest current. 30-hp three-phase squirrel-cage motor keeps Save Submit
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