A motor circuit is providing 480 volts and 25 amps to a 3-phase motor that is...
A motor circuit is providing 480 volts and 25 amps to a 3-phase motor that is rated at 10 HP. What is the apparent power? What is the true power? What is the power factor? What is the reactive power?
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A motor circuit is providing 480 volts and 25 amps to a 3-phase
motor that is...
A motor circuit is providing 480 volts and 25 amps to a 3-phase motor that is...
A motor circuit is providing 480 volts and 25 amps to a 3-phase motor that is rated at 10 HP Apparent power =20.784 KVA True Power = 7.46 KW Power Factor = 36 % Reactive Power = 19.4 kVAR What would the apparent power be at 95% power factor? What would the reactive power be at 95% power factor? What is the difference between the two reactive powers? Based on the use of 17 CkVAR of capacitance, what would the...
A motor circuit is providing 480 volts and 25 amps to a 3-phase motor that is...
A motor circuit is providing 480 volts and 25 amps to a 3-phase motor that is rated at 10 HP. If the utility charged $0.17 per kWh, what was the original cost of operating the motor per hour before correction?
a) Three-Phase Motor Specs: Line Voltage: 113.7 volts True power: 1,275 watts Apparent power: 1,888 voltamps...
a) Three-Phase Motor Specs: Line Voltage: 113.7 volts True power: 1,275 watts Apparent power: 1,888 voltamps What is the power factor of this circuit? b) Single-Phase Motor Specs: Voltage: 126.9 volts Amperage Draw: 13.5 amps Motor Resistance: 149 ohms Motor Inductive Reactance: 63 ohms What size of a capacitor, in microfarads, is needed to change PF = 1.0?
2) A 480 V, 60 Hz, 400 hp 0.8 PF-lagging eight-pole A-connected synchronous motor has a...
2) A 480 V, 60 Hz, 400 hp 0.8 PF-lagging eight-pole A-connected synchronous motor has a synchronous reactance of 0.6 and negligible armature resistance. Ignore the mechanical and core losses. The magnitude of the internal machine voltage is 480 V when the field current is 4 A. Assume magnetic linearity. Initially, the motor operates at the rated conditions. a) Find the speed of this motor. b) Find the armature and field currents. c) What is the developed torque? What is...
Problem 3:A 480 V, 50 kW, 60 Hz, 3-φ synchronous motor has a synchronous reactance of Xs = 4.56 Ω and an armature-to-field mutual inductance, Laf = 150 mH. The motor is operating at rated speed an...
Problem 3:A 480 V, 50 kW, 60 Hz, 3-φ synchronous motor has a synchronous reactance of Xs = 4.56 Ω and an armature-to-field mutual inductance, Laf = 150 mH. The motor is operating at rated speed and terminal voltage and at an output power of 35kW. Neglecting losses in the motor, calculate the magnitude and phase angle of the line-to-neutral generated voltage Eaf and field current I if the motor is operating at (a) 0.9 power factor lagging (b) unity...
Problem 3:A 480 V, 50 kW, 60 Hz, 3-φ synchronous motor has a synchronous reactance of...
Problem 3:A 480 V, 50 kW, 60 Hz, 3-φ synchronous motor has a synchronous reactance of Xs = 4.56 Ω and an armature-to-field mutual inductance, Laf = 150 mH. The motor is operating at rated speed and terminal voltage and at an output power of 35kW. Neglecting losses in the motor, calculate the magnitude and phase angle of the line-to-neutral generated voltage Eaf and field current I if the motor is operating at (a) 0.9 power factor lagging (b) unity...
A 30 hp 460V 3-phase motor requires 35 amps at full load. The power factor is...
A 30 hp 460V 3-phase motor requires 35 amps at full load. The power factor is 0.86 Determine the efficiency of the motor.
A 2 pole ac induction motor operates on a 480 V three phase power system. The...
A 2 pole ac induction motor operates on a 480 V three phase power system. The motor is rated a 50 hp and 460 V with a full load shaft speed of 3400 rpm. The motor currently operates a 3510 rpm. determine the mechanical power the motor develops in hp using the slip method.
A 2 pole ac induction motor operates on a 480 V three phase power system. The motor is rated a 50 hp and 460 V with...
8) The motor model for a 3-phase 480V 1750 RPM induction motor is shown below. Stray...
8) The motor model for a 3-phase 480V 1750 RPM induction motor is shown below. Stray losses are 1000W. Assuming it is running at full rated load in the United States, find: 0.01 j0.14 j0.14 0 _ 0.01 A 19 j16 30.01/18 ) Synchronous Speed= RPM Number of poles= Poles Slip= Stator current iz = Amps Rotor current lz= Amps Magnetization currently = Amps Watts HP Volts Power across the air gap= h) 3-phase shaft (brake) horsepower= Terminal Voltage "V"=...
Problem 1. (25 points) A 200-hp 440-V 0.8-PF-leading љс0nnected synchronous motor has an armature resistance of 0.6 Ω and a synchronous reactance of 8.0 Ω. Its efficiency at full load is 90 percent....
Problem 1. (25 points) A 200-hp 440-V 0.8-PF-leading љс0nnected synchronous motor has an armature resistance of 0.6 Ω and a synchronous reactance of 8.0 Ω. Its efficiency at full load is 90 percent. 1. What is the input power to the motor at rated conditions? 2. What is the line current of the motor at rated conditions? What is the phase current of the motor at rated conditions? 3. What is the reactive power consumed by or supplied by the...
2) A 480 V, 60 Hz, 400 hp 0.8 PF-lagging eight-pole A-connected synchronous motor has a synchronous reactance of 0.6 and negligible armature resistance. Ignore the mechanical and core losses. The magnitude of the internal machine voltage is 480 V when the field current is 4 A. Assume magnetic linearity. Initially, the motor operates at the rated conditions. a) Find the speed of this motor. b) Find the armature and field currents. c) What is the developed torque? What is...
Problem 3:A 480 V, 50 kW, 60 Hz, 3-φ synchronous motor has a synchronous reactance of Xs = 4.56 Ω and an armature-to-field mutual inductance, Laf = 150 mH. The motor is operating at rated speed and terminal voltage and at an output power of 35kW. Neglecting losses in the motor, calculate the magnitude and phase angle of the line-to-neutral generated voltage Eaf and field current I if the motor is operating at (a) 0.9 power factor lagging (b) unity...
Problem 3:A 480 V, 50 kW, 60 Hz, 3-φ synchronous motor has a synchronous reactance of Xs = 4.56 Ω and an armature-to-field mutual inductance, Laf = 150 mH. The motor is operating at rated speed and terminal voltage and at an output power of 35kW. Neglecting losses in the motor, calculate the magnitude and phase angle of the line-to-neutral generated voltage Eaf and field current I if the motor is operating at (a) 0.9 power factor lagging (b) unity...
A 2 pole ac induction motor operates on a 480 V three phase power system. The motor is rated a 50 hp and 460 V with a full load shaft speed of 3400 rpm. The motor currently operates a 3510 rpm. determine the mechanical power the motor develops in hp using the slip method.
A 2 pole ac induction motor operates on a 480 V three phase power system. The motor is rated a 50 hp and 460 V with...
8) The motor model for a 3-phase 480V 1750 RPM induction motor is shown below. Stray losses are 1000W. Assuming it is running at full rated load in the United States, find: 0.01 j0.14 j0.14 0 _ 0.01 A 19 j16 30.01/18 ) Synchronous Speed= RPM Number of poles= Poles Slip= Stator current iz = Amps Rotor current lz= Amps Magnetization currently = Amps Watts HP Volts Power across the air gap= h) 3-phase shaft (brake) horsepower= Terminal Voltage "V"=...
Problem 1. (25 points) A 200-hp 440-V 0.8-PF-leading љс0nnected synchronous motor has an armature resistance of 0.6 Ω and a synchronous reactance of 8.0 Ω. Its efficiency at full load is 90 percent. 1. What is the input power to the motor at rated conditions? 2. What is the line current of the motor at rated conditions? What is the phase current of the motor at rated conditions? 3. What is the reactive power consumed by or supplied by the...
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