The three-phase average power of a synchronous motor is 23kW. The three-phase line supplying the motor...
The three-phase average power of a synchronous motor is 23kW. The three-phase line supplying the motor has a line voltage rating of 208 V (rms). The line current is 75A per phase. Determine the power factor and the reactive power absorbed by the motor/
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The three-phase average power of a synchronous motor is 23kW.
The three-phase line supplying the motor...
A three-phase synchronous motor has a synchronous reactance of 7 ohm/phase. And the armature resistance is...
A three-phase synchronous motor has a synchronous reactance of 7 ohm/phase. And the armature resistance is negligible. The input power is 1000 kW, and the excitation voltage is 4500 volts rms. If the terminal voltage of the motor is 4060 volts rms. Then find: a) the power angle ; b) the armature current ; c) the power factor
A 2200Vrms (line-to-line), 30Hz, Y-connected, 3-phase synchronous motor has a synchronous reactance of 10Ω per phase....
A 2200Vrms (line-to-line), 30Hz, Y-connected, 3-phase synchronous motor has a synchronous reactance of 10Ω per phase. The motor draws 163kW at a power angle of 15°. Determine: a) The excitation voltage per phase. b) The supply current and the supply power factor. c) Draw the phasor diagram for the above condition. d) Suppose the mechanical load is now disconnected, with all the losses are negligible. Determine the new supply current and the supply power factor.
A three phase 10-pole synchronous motor has per phase synchronous resistance of 4.3 ohm. It is...
A three phase 10-pole synchronous motor has per phase synchronous resistance of 4.3 ohm. It is connected to a 4160V (line to line) 60Hz line and generates an excitation voltage Eo of 1790V (line to neutral) when the dc exciting current is 30A. The Torque angle between E and Eo is 30 degrees. Calculate a) The mechanical angle between the center of rotor and stator poles b) The voltage across the synchronous reactance c) The power delivered to the motor...
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-...
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 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the ...
1. A 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters in Ω/phase referred to the stator: R,-0.220, Xi = 0.430, X,-15.0, R2 0.130 and X2-0.430. Mechanical and core losses amount to 300 W and 200 W respectively for rated voltage. (a) The motor is fed with a 60 Hz, 208 V voltage. It runs with a slip of 4.5 %. Find the speed, shaft torque and power, efficiency and power...
A 440-V, 60-Hz, 4-pole, three-phase, A-connected, synchronous motor has a synchronous impedance of 1.2 + j8...
A 440-V, 60-Hz, 4-pole, three-phase, A-connected, synchronous motor has a synchronous impedance of 1.2 + j8 n/phase. The field current is adjusted so that the excitation voltage is 560 V. When the motor develops the maximum power, determine (a) the line current, (b) the power factor, (c) the torque angle, (d) the maximum power developed, and (e) the maximum torque developed.
9. A three phase balanced Y connected source is supplying three, three phase loads that are...
9. A three phase balanced Y connected source is supplying three, three phase loads that are connected in parallel. First load is a y connected and has an impedance of 30+j40 ohms. The second load is absorbing a total of 150kVA at 0.5 power factor lagging. The third load is absorbing 150kVA at 0.5 power factor leading. The line to line source rms voltage is 2500V. i Find the load current in each load i) Find the total real and...
A 4-pole, 60Hz, three-phase synchronous motor with a synchronous reactance of 0.5 Ω is working at...
A 4-pole, 60Hz, three-phase synchronous motor with a synchronous reactance of 0.5 Ω is working at half load with torque of 20 N-m. Assume ?? = 120∠00 ? (phase voltage). When working at the full load, the equivalent field voltage is Ef = 100 V (phase voltage). a) Draw the per-phase equivalent circuit and label the parameters (5 Points) b) Determine the power consumed by the half load (5 Points) c) Calculate the armature current and active power consumed, at full...
A 208 V, star-connected, 3-phase synchronous motor has a synchronous reactance of 4 ohms/phase and negligible...
A 208 V, star-connected, 3-phase synchronous motor has a synchronous reactance of 4 ohms/phase and negligible armature winding resistance. At a certain load, the motor takes 7.2 kW at 0.8 pf lagging. If the power developed by the motor remains the same while the excitation voltage is increased by 50% by raising the field excitation, determine (a) the new armature current and (b) the new power factor.
5) When supplying power at 33 degrees to the 480V bus, the three phase two-pole 50...
5) When supplying power at 33 degrees to the 480V bus, the three phase two-pole 50 Hz wye connected synchronous alternator with synchronous reactance of 2.14 Ohms per Phase has a torque of 375 lb-ft. Neglecting losses, determine power supplied to the bus, excitation voltage, active and reactive components of apparent power, power factor, (25 Points)
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 15 hp, 4 pole, 208 V, 60 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters in Ω/phase referred to the stator: R,-0.220, Xi = 0.430, X,-15.0, R2 0.130 and X2-0.430. Mechanical and core losses amount to 300 W and 200 W respectively for rated voltage. (a) The motor is fed with a 60 Hz, 208 V voltage. It runs with a slip of 4.5 %. Find the speed, shaft torque and power, efficiency and power...
9. A three phase balanced Y connected source is supplying three, three phase loads that are connected in parallel. First load is a y connected and has an impedance of 30+j40 ohms. The second load is absorbing a total of 150kVA at 0.5 power factor lagging. The third load is absorbing 150kVA at 0.5 power factor leading. The line to line source rms voltage is 2500V. i Find the load current in each load i) Find the total real and...
5) When supplying power at 33 degrees to the 480V bus, the three phase two-pole 50 Hz wye connected synchronous alternator with synchronous reactance of 2.14 Ohms per Phase has a torque of 375 lb-ft. Neglecting losses, determine power supplied to the bus, excitation voltage, active and reactive components of apparent power, power factor, (25 Points)
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