QI A 3-phase induction motor with 3 kV, 400 HP, 70% efficiency and 0.8 PF is to be protected against overload. The motor can withstand 10% overload continuously and a thermal relay is connected across a current transformer of 600/5 ratio. Choose the proper relay setting.

QI A 3-phase induction motor with 3 kV, 400 HP, 70% efficiency and 0.8 PF is to be protected against overload. The motor can withstand 10% overload continuously and a thermal relay is connected across a current transformer of 600/5 ratio. Choose the proper relay setting.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter51: Electric And Electronic Braking

Section: Chapter Questions

Problem 2SQ: Differentiate between the AC and DC magnetic fields applied to an induction motor stator.

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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

Q1
A 3-phase induction motor with 3 kV, 400 HP, 70% efficiency and 0.8 PF is to be
protected against overload. The motor can withstand 10% overload continuously and
a thermal relay is connected across a current transformer of 600/5 ratio. Choose the
proper relay setting.

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