EBK ELECTRICAL TRANSFORMERS AND ROTATIN
4th Edition
ISBN: 9781337025867
Author: Herman
Publisher: VST
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Question
Chapter 21, Problem 8RQ
To determine
The conductor sizes, overload heater size, fuse size, minimum NEMA and IEC starter sizes, and the upper and lower range of starting current for this motor.
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Three coils each having resistance of 29 N are connected in star across 422 V, 50 Hz supply. Then the total
power consumed is
O 211.77 W
O 3545.51 W
O 730.95 W
O 6140.83 W
Q A motor of 15 horsepower, has a code letter L, and is operated on a 400-volt line. Find the locked rotor current
A balanced star-connected load of (8 + j6) Q per phase is connected to a Balanced 3- phase 400-V supply. Find the line current, power factor, power
Chapter 21 Solutions
EBK ELECTRICAL TRANSFORMERS AND ROTATIN
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- 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_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_forwardName three factors that determine the amount of induced voltage.arrow_forward
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- What 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_forwardAn AC power source is connected across 325 turns of an autotransformer, and the load is connected across 260 turns. What is the turns ratio of this transformer?arrow_forwardA wye-connected load has a voltage of 480 V applied to it. What is the voltage dropped across each phase?arrow_forward
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