. A three-phase,50-Hz, 470-V system supplies the following loads: A six-pole, 50-Hz, 340-hp, three-phase, wye-connected induction motor, operating at 78 percent of the rated load with an efficiency of 90.0 percent and a power factor of 83.1 percent. 2. A 59-kW, delta-connected, three-phase resistance heater. 3. A 250-hp, 50-Hz, four-pole, wye-connected, cylindrical-rotor synchronous motor, operating at 45 percent of the rated load, with a torque angle of -13.9º. Neglecting copper losses, the synchronous motor is operating at 96.9 percent efficiency, and its synchronous reactance is 0.813 Ohm/phase. Determine the reactive power of the induction motor in volt-ampere reactive. Give your final answer in 2 decimal places.
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
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9. A three-phase,50-Hz, 470-V system supplies the following loads: A six-pole, 50-Hz, 340-hp, three-phase, wye-connected induction motor, operating at 78 percent of the rated load with an efficiency of 90.0 percent and a power factor of 83.1 percent. 2. A 59-kW, delta-connected, three-phase resistance heater. 3. A 250-hp, 50-Hz, four-pole, wye-connected, cylindrical-rotor synchronous motor, operating at 45 percent of the rated load, with a torque angle of -13.9º. Neglecting copper losses, the synchronous motor is operating at 96.9 percent efficiency, and its synchronous reactance is 0.813 Ohm/phase. Determine the reactive power of the induction motor in volt-ampere reactive. Give your final answer in 2 decimal places.
Correct Answer: 147,148.67 ± 0.01
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