A three-phase motor is connected to 410 V. The motor is located 900 ft from the power source, and has a starting current of 200 A. The voltage drop to the motor cannot be greater than 5% during starting. What size copper conductors should be connected to the motor?
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- 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.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.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? motor winding is bad ambient temperature is too high and the overload needs to be adjusted to account for that overload setting is too low bearing is bad or the load is too heavy
- 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?Please show a step-by-step solution A 3-phase, 370 V wound rotor motor has delta-connected stator winding and star-connected rotor-winding. The stator has 47 turns per phase while the rotor has 29 turns per phase. Find the standstill or open-circuited voltage across the slip rings. Correct Answer: 395.42 (Volts)The fuse in one of the supply phases of a running 3-phase I.M. blows off. Will the motor continue to run at ( i) original speed (ii) reduced speed (iii) come to stand still?
- A single-phase electric motor is connected to a 240-volt, 30-ampere circuit. The motor nameplate indicates that the full-load current draw of the motor is 21 amperes. The motor is connected to an inertia load (a large flywheel) that requires several seconds for the motor to accelerate to full speed. Because of the long starting time, the motor causes the circuit breaker to trip before the load has reached full speed. Your job is to connect a resistor in series with the motor during the starting period that will limit the starting current to 90% of the circuit-breaker rating. An ammeter indicates that the motor has a current draw of 64 amperes when power is first applied to the motor. Determine the ohmic value and wattage rating of the resistor that should be connected in series with the motor during the starting period.In a 50kVA star connected 440 V, Three phase, 60Hz alternator, the effective armature resistance is 0.25 ohm per phase, what is the percentage regulation on full load?How many poles must be used for 100kW, 230V, 80 Hz alternator running at 10 rps speed?
- please answer asap A 40Kw motor with a heating time constant of 120 minutes has a final temperature rise of 60 degree Celsius on continuous rating. Determine half hour rating for same temperature rise. Motor has maximum efficiency of 80% of full loadYou 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 FLA: 352 Volts: 480 RPM: 1755 Frame: XXX Code: L 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?DC/AC MOTOR (UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS LEGIBLY. NO LONG EXPLANATIONS NEEDED. ANSWER IN 2 DECIMAL PLACES. BOX THE FINAL ANSWER.) A 4-pole, 75 kW, 3-phase, Y connected load, 50Hz 440 V synchronous motor operates at rated condition with 0.8 pf leading. The motor efficiency excluding field and stator losses is 95% and Xs = 2.5 ohms what is the machinal power developed? a. 15250 W b. 92000 W c. 78950 W d. 52446 W