Three lines supply power to a three phase motor. if one of of these lines should open, the motor will be connected to single-phase power. This condition is known as
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A three-phase motor is designed to operate with three alternating current (AC) power lines, which provide a balanced load and efficient operation. Show more…
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Unit 32 Practical Applications You are working as a plant electrician. It is your job to install a 300-hp three-phase squirrel-cage induction motor. The supply voltage is 480 V. The power company has determined that the maximum amount of starting current that can be permitted by any motor in the plant is 3000 A. The motor nameplate is as follows: Phase: 3 Volts: 480 FLA: 352 RPM: 1755 Code: Frame: Will it be possible to start this motor across the line, or will it be necessary to use a reduced-voltage starter to reduce starting current? 2. You have been given the task of connecting a nine-lead three-phase dual-voltage motor to a 240-V line. You discover that the nameplate has been painted and you cannot see the connection diagram. To make the proper connections, you must know if the motor stator winding is connected wye or delta. How could you determine this using an ohmmeter? Explain your answer. 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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