A motor is tripping out on overload. The motor nameplate reveals a full load current of 168 amperes. When the motor is operating under load, an ammeter indicates the following: Phase #1=166 amps, Phase #2=164 amps, Phase #3=225 amps. The motor has been in service for 3 weeks. What is most likely the problem? One of the windings is shorted to ground (case of the motor) One of the windings is starting to open a bearing is going bad in one of the phases none of these is the problem.

A motor is tripping out on overload. The motor nameplate reveals a full load current of 168 amperes. When the motor is operating under load, an ammeter indicates the following: Phase #1=166 amps, Phase #2=164 amps, Phase #3=225 amps. The motor has been in service for 3 weeks. What is most likely the problem? One of the windings is shorted to ground (case of the motor) One of the windings is starting to open a bearing is going bad in one of the phases none of these is the problem.

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 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 Amps, Phase #2=104 Amps, and Phase #3=105 Amps. The motor has been in service for six months. What is most likely the problem?
A motor is tripping out on overload. The motor nameplate reveals a full load current of 168 amperes. When the motor is underneath load, an ammeter indicates the following: phase 1=166 amps, phase 2=164 amps, phase 3=225 amps. What is the most likely problem with this motor?
You are an electrician working in an industrial plant. A 30-hp three-phase squirrel- cage motor keeps tripping out on overload. The motor is connected to a 240-volt line. Voltage measurements indicate the following voltages between the different phases: A-B = 276 volts, B-C = 221 volts, and A-C = 267 volts. Determine the percentage of heat rise in the winding with the highest current.
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		One of the windings is shorted to ground (case of the motor)
		One of the windings is starting to open
		a bearing is going bad in one of the phases
		none of these is the problem.