Answered: When the 3-phase star connected…

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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When the 3-phase star connected squirrel-cage asynchronous motor with 2-pole, 18.5 kW, 400V, 50 Hz label values operates at rated power (full load), the slip value is 4% and the power coefficient is 0.88. When operating at rated power, friction and ventilation losses are equal to 5% of the useful power. Since the iron and copper losses of the stator while operating at rated power are 3 times the copper losses of the rotor;

a) Calculate the rotor mechanical speed (rpm) at full load.

b) Calculate the mechanical power at full load.

c) Calculate the input power (active power drawn from the grid) at full load.

d) Calculate the current drawn from the network at full load.

e) Calculate the efficiency of the motor at full load.

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