Answered: A 3-phase motor is rated at 100VA 0.9pf…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A 3-phase motor is rated at 100VA 0.9pf lag when operated with 100V 60Hz. The motor must be operated within 95-105V only. There is also an existing 100V 60Hz 3-phase generator set to be tested and verify if it can power the motor. There is a 3-phase connector with 15A rating per line that can be used.

Assume that the motor is linear enough that the impedances will be the same when operated with different magnitude of voltage. Next, the generator was tried but without the load first and it was able to output 99V (not an ideal 100V generator). The generator was also able to present some source impedances Zs=7+j2.6 ohms modeled as shown.

If you connect the generator to drive the motor, what will be the magnitude of the expected line-to-line voltage accross the motor load?

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