A three Phase motor is tripping out on load. The nameplate of the motor reveals a full load current of 168 A. When the motor is operating under load,an ammeter indicates the following: Phase A = 168 A, Phase B = 164 A, and Phase C =125 A. What is the most likely problem with the motor? Explain what must be done to clear the fault.

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 3PA: You are an electrician working in an industrial plant. A 30-hp three-phase squirrel- cage motor...
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A three Phase motor is tripping out on load. The nameplate of the motor reveals a full load current of 168 A. When the motor is operating under load,an ammeter indicates the following: Phase A = 168 A, Phase B = 164 A, and Phase C =125 A. What is the most likely problem with the motor? Explain what must be done to clear the fault. 

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