Answered: The power input to 100 hp, 480 V, 88%…

The power input to 100 hp, 480 V, 88% efficiency and 75 % power factor 3 phase motor at full load is measured by a two watt meter connected at lines A and C. What are the readings in kW?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.29MCQ: The total instantaneous power absorbed by a three-phase motor (under balanced steady-state...

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Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

Question

The power input to 100 hp, 480 V, 88% efficiency and 75 % power factor 3 phase motor at full load is measured by a two watt meter connected at lines A and C. What are the readings in kW?

• 67.89 and 30.4
• 66.23 and 21.55
• 87.76 and 11.7
• 69.5 and 18.26

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