7. A 3-phase, 400 V synchronous motor having a power consumption of 50 kW is connected in parallel with an induction motor which takes 200 kW at a power factor of 0-8 lagging. (i) Calculate the current drawn from the mains when the power factor of the synchronous motor is unitv. (ii) At what power factor should the synchronous motor operate so that the current drawn from the mains is minimum. ? [(1) 421 A (ii) 0-316 leading]

7. A 3-phase, 400 V synchronous motor having a power consumption of 50 kW is connected in parallel with an induction motor which takes 200 kW at a power factor of 0-8 lagging. (i) Calculate the current drawn from the mains when the power factor of the synchronous motor is unitv. (ii) At what power factor should the synchronous motor operate so that the current drawn from the mains is minimum. ? [(1) 421 A (ii) 0-316 leading]

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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Concept explainers

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

7. A 3-phase, 400 V synchronous motor having a power consumption of 50 kW is connected in parallel
with an induction motor which takes 200 kW at a power factor of 0-8 lagging.
(i) Calculate the current drawn from the mains when the power factor of the synchronous motor is
unitv.
(ii) At what power factor should the synchronous motor operate so that the current drawn from the
mains is minimum. ?
[(1) 421 A (ii) 0·:316 leading]

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