Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Question
Chapter 47, Problem 8RQ
To determine
The conductor size, overload size, fuse size, minimum NEMA and IEC starter sizes and the upper and the lower range for starting the current for the given motor.
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Q A motor of 15 horsepower, has a code letter L, and is operated on a 400-volt line. Find the locked rotor current
Chapter 47 Solutions
Industrial Motor Control
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- A 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_forwardName three factors that determine the amount of induced voltage.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 480-volt three-phase load is rated at 34.5 kVA. It is to be supplied with variable three-phase voltage. Because the load is continuous, the transformers ratings are to be increased by 1.25% of the rated load. Three variable autotransformers are used to supply this load. Refer to Table 4-2 and determine the standard size of each transformer that should be used to make this connection.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_forwardIf dual-element time delay fuses are to be used as the short circuit protective device, what size fuses should be used to protect the circuit in question #12? Five 5 HP, three-phase motors with NEMA code B are connected to a 240-volt line. The conductors are copper with type THWN insulation. What size conductor should be used to supply all of these motors?arrow_forward
- A 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_forwardA 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_forward
- An alternator with a line voltage of 2400 V supplies a delta-connected load. The line current supplied to the load is 40 A. Assuming the load is a balanced three-phase load, what is the impedance of each phase?arrow_forwardWhat is an amortisseur winding and what function does it serve?arrow_forwardA 10 kVA transformer has a primary voltage rating of 240 volts and a secondary voltage rating of 480 volts. The transformer is connected to a circuit protected by a 100 ampere circuit breaker. The secondary is protected by a 25-ampere fuse. Does the primary require separate overcurrent protection?arrow_forward
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