Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818



Electric Motor Control

10th Edition
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 60, Problem 3SQ
Textbook Problem

A motor is tripping out on overload. The motor nameplate reveals a full-load current of 68 amperes. When the motor is operating under load, an ammeter indicates the following: phase 1 = 106 amperes, phase 2 = 104 amperes, and phase 3 = 105 amperes. What is the most likely problem with this motor?

To determine

Write the most probable problem (or fault) that exists in the motor.

Explanation of Solution

Given data:

The full-load current of a motor is 68 amperes.

Current measured by the ammeter through a phase-1 is 106 amperes.

Current measured through a phase-2 is 104 amperes.

Current measured through a phase-3 is 105 amperes.


From the given data, it is clear that the currents through the three phases are approximately equal but exceed the full-load current. That is, the current through each phase is more than the full-load...

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