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Engineering and Tech / Introduction to Electric Circuits 9 / Chapter 12.7 / Problem P12.7-8

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

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The balanced three-phase load of a large commercial building requires 480 kW at a

Chapter 12, Problem P12.7-8

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QUESTION:

The balanced three-phase load of a large commercial building requires 480 kW at a lagging power factor of 0.8. The load is supplied by a connecting line with an impedance of 5 + j25 m\(\Omega\) for each phase. Each phase of the load has a line-to-line voltage of 600 V rms. Determine the line current and the line voltage at the source. Also, determine the power factor at the source. Use the line-to-neutral voltage as the reference with an angle of \(0^ \circ\).

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QUESTION:

The balanced three-phase load of a large commercial building requires 480 kW at a lagging power factor of 0.8. The load is supplied by a connecting line with an impedance of 5 + j25 m\(\Omega\) for each phase. Each phase of the load has a line-to-line voltage of 600 V rms. Determine the line current and the line voltage at the source. Also, determine the power factor at the source. Use the line-to-neutral voltage as the reference with an angle of \(0^ \circ\).

ANSWER:

Step 1 of 6

The apparent power of the load,

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