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 new power factor be?
If the utility charged $0.17 per kWh, what was the original cost of operating the motor per hour before correction?
If the utility charged $0.17 per kWh, what was the original cost of operating the motor per hour after correction?
If the utility charged $0.17 per kWh, how much money is saved per hour with the power factor corrected?
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 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?
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...
please show steps. Thank you.
(40%) Problem 2 of 3: An engine-generator set is paralleled with a 13.2 kv, 60 Hz infinite (utility) bus to deliver power to a 2000 kw plant load at 0.866 lagging power factor. The synchronous generator is wye-connected and rated 3750 kva, 13.2 kv, and 0.8 power factor lagging with 1.0 per unit synchronous reactance and negligible armature resistance. 13.2 kVI 60 Hz I infinite bus utility) rated: 3750 kva 0.8 lag load: 2000 kW...
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...
Based on the motor nameplate below, when operated at the rated
voltage and current, determine the following:
a. The real power, P, reactive power, Q, and
apparent power, S, used by the motor.
b. Sketch an equivalent circuit to model for
the motor.
c. The efficiency of the motor (calculated from
shaft power/real power in).
d. What value of capacitor would you use to
correct the power factor to 1?
e. Sketch a vector diagram showing the phasor
current in...
Consider a 3-phase, 4 pole, 60Hz, 450 V synchronous generator rated to supply 1687.5 kVA to a ship distribution system requiring a 0.8 lagging power factor. (a) If this machine was operating at rated conditions, what would the real (P) and reactive (Q) power and the current being supplied? (b) If the generator has an efficiency ( η ) of 95%, what torque does the prime mover provide? (c) What is the speed of the rotor (rpm)?
Question 5 (Svnchronous machines) a. A synchronous generator connected to an infinite grid has its frequency and terminal b. A six-pole, Y-connected three-phase synchronous machine rated 208 V (line-to- voltage fixed. What is the effect of increasing the excitation current in this case? line), 5500 VA has a synchronous reactance of 8 2 per phase at rated terminal voltage. It is operating as a generator connected to an infinite grid Determine the excitation voltage and the power angle if the...
1- A 25-kVA, 3-phase, wye-connected, 400-V alternator has a synchronous reactance of 1.6 ohms per phase. The alternator is to have zero voltage regulation at half-load. Neglecting the armature resistance, find the operating power factor and the developed power 2. A 500-kVA, 3600-V, 3-phase, 60-Hz alternator has an effective armature resistance per phase of 0.40 ohm Mechanical and iron losses is 10 kW, field current at full load unity power factor is 70 A. The exciter voltage is constant at...