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Engineering and Tech / Introduction to Electric Circuits 9 / Chapter 12.8 / Problem P12.8-1

Introduction to Electric Circuits | 9th Edition | ISBN: 9781118477502 | Authors: James A. Svoboda, Richard C. Dorf

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The two-wattmeter method is used to determine the power drawn by a three-phase 440-V rms

Chapter 12, Problem P12.8-1

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QUESTION:

The two-wattmeter method is used to determine the power drawn by a three-phase 440-V rms motor that is a Y-connected balanced load. The motor operates at 20 hp at 74.6 percent efficiency. The magnitude of the line current is 52.5 A rms. The wattmeters are connected in the A and C lines. Find the reading of each wattmeter. The motor has a lagging power factor.

Hint: 1 hp = 745:7 W

Questions & Answers

QUESTION:

The two-wattmeter method is used to determine the power drawn by a three-phase 440-V rms motor that is a Y-connected balanced load. The motor operates at 20 hp at 74.6 percent efficiency. The magnitude of the line current is 52.5 A rms. The wattmeters are connected in the A and C lines. Find the reading of each wattmeter. The motor has a lagging power factor.

Hint: 1 hp = 745:7 W

ANSWER:

Step 1 of 4

Calculating input power,

The input power is also calculated by the shown equation,

Then, calculating ,

Thus,

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