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A three-phase, 460 V motor, rated 200 Hp is loaded at 67% of its rating. The motor is 93.2% efficient at this load and operates at a power factor of 0.91 lagging. A wattmeter is placed in the circuit with its current coil connected in the yellow line and its voltage coil connected between the yellow and blue lines. Calculate the power measured by this wattmeter if: a) The motor is star-connected b) The motor is delta-connected. Note: 1 Hp=746 W CS Scanned with CamScanner

A three-phase, 460 V motor, rated 200 Hp is loaded at 67% of its rating. The motor is 93.2% efficient at this load and operates at a power factor of 0.91 lagging. A wattmeter is placed in the circuit with its current coil connected in the yellow line and its voltage coil connected between the yellow and blue lines. Calculate the power measured by this wattmeter if: a) The motor is star-connected b) The motor is delta-connected. Note: 1 Hp=746 W CS Scanned with CamScanner

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter7: Alternating Current, Power Distribution, And Voltage Systems
Section: Chapter Questions
Problem 8RQ
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A three-phase, 460 V motor, rated 200 Hp is loaded at 67% of its rating. The motor is 93.2% efficient at this load and operates at a power factor of 0.91 lagging. A wattmeter is placed in the circuit with its current coil connected in the yellow line and its voltage coil connected between the yellow and blue lines. Calculate the power measured by this wattmeter if: a) The motor is star-connected b) The motor is delta-connected. Note: 1 Hp=746 W CS Scanned with CamScanner
Transcribed Image Text:A three-phase, 460 V motor, rated 200 Hp is loaded at 67% of its rating. The motor is 93.2% efficient at this load and operates at a power factor of 0.91 lagging. A wattmeter is placed in the circuit with its current coil connected in the yellow line and its voltage coil connected between the yellow and blue lines. Calculate the power measured by this wattmeter if: a) The motor is star-connected b) The motor is delta-connected. Note: 1 Hp=746 W CS Scanned with CamScanner
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