Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 21, Problem 3RQ
To determine
The full load current of single phase squirrel cage motor and minimum sizes of NEMA and IEC starters.
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Can someone please help me to solve the following question showing all work. Thank you
There is a 3 HP, 220 Vrms single - phase induction motor that operates with a 0.85
lagging power factor and 80 9% efficiency. What is the magnitude of the RMS motor
current?
O 75 Amps
15 Amps
O 5 Amps
O 3 Amps
Q A motor of 15 horsepower, has a code letter L, and is operated on a 400-volt line. Find the locked rotor current
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Electrical Transformers and Rotating Machines
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- A ¾ HP, single-phase squirrel cage motor is connected to 240-volt AC line. What is the full load current rating of this motor and what is the minimum size NEMA and IEC starters that should be used?arrow_forwardWhat is the full-load running current of a three-phase, 50-hp motor connected to a 560-volt line? What are the minimum size NEMA and IEC starters that should be used to connect this motor to the line?arrow_forwardA 125-hp synchronous motor is connected to a 230-volt three-phase AC line. The motor is intended to operate at 80% power factor. What is the full-load running current of this motor? What are the minimum size NEMA and IEC starters that should be used to connect this motor to the line?arrow_forward
- A 150-horsepower motor is to be installed on a 480-volt three-phase line. What is the minimum size NEMA starter that should be used for this installation?arrow_forwardA 125 HP, synchronous motor is connected to a 230-volt, three phase AC line. The motor is intended to operate at 80 percent power factor. What is the full load running current of this motor? What is the minimum size NEMA and IEC starters that should be used to connect this motor to the line?arrow_forwardA 75-hp, three-phase squirrel-cage induction motor is connected to 480 volts. The motor has a NEMA code D. What is the starting current for this motor?arrow_forward
- A 20-hp, three-phase squirrel-cage induction motor has a NEMA code E. The motor is connected to 208 volts. What is the starting current for this motor?arrow_forwardA 20 HP, three-phase squirrel cage induction motor has a NEMA code E. The motor is connected to 208 volts. What is the starting current for this motor?arrow_forwardA large motor has a full load current rating of 425 amperes. Current transformers with a ratio of 600:5 are used to reduce the current to the overload heaters. What should be the full load current rating of the overload heaters?arrow_forward
- What is the speed of operation of the Holtz motor?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forwardThe motor nameplate of a wye-delta started motor has a full load current of 287 amperes. What current rating should be used to determine the proper overload heater size?arrow_forward
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