A water pump employs 3 phase, 50 HP induction motor which is started using a star delta starter. It is fed from feeder mains with a 3 phase, 440 volts, 50 Hz supply. Because of the drops in the feeder it is found that the starting torque is same for both star and delta connections. Calculate the resistance of the feeder. From the short circuit test on the motor the following details are obtained: V = 200 volts, I = 125 Amps, and pf = 0.4. If an identical feeder is run in parallel with the first one find the % increase in starting torque obtained with each connection. (Ans: 1.6 2, 37%, 119%)

A water pump employs 3 phase, 50 HP induction motor which is started using a star delta starter. It is fed from feeder mains with a 3 phase, 440 volts, 50 Hz supply. Because of the drops in the feeder it is found that the starting torque is same for both star and delta connections. Calculate the resistance of the feeder. From the short circuit test on the motor the following details are obtained: V = 200 volts, I = 125 Amps, and pf = 0.4. If an identical feeder is run in parallel with the first one find the % increase in starting torque obtained with each connection. (Ans: 1.6 2, 37%, 119%)

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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