A 1-MW, three-phase, star connected, 3.3-kV, 24-pole, 50-Hz synchronous motor has a synchronous reactance of 3.24...

A 1-MW, three-phase, star connected, 3.3-kV, 24-pole, 50-Hz synchronous motor has a synchronous reactance of 3.24 ohms per phase. The armature resistance may be ignored. This motor is energized from 3.3-kV infinite bus bars. The field excitation is adjusted until unity power factor at rated load is achieved. Compute the maximum power and torque that the motor can deliver with the excitation remaining unchanged

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Manojponduru answered 1 year ago

A 400V, 50 Hz , 80 hp eight pole Δ connected synchronous motor has a reactance...

A 400V, 50 Hz , 80 hp eight pole Δ connected synchronous motor has a reactance of 0.6 and negligible armature resistance. Its friction, windage and core losses are 1.2KW, 0.5KW and 1KW respectively . What is the speed of this motor? If this motor is initially supplying rated hp at 0.82 PF lagging . What are the magnitudes and angles of ? What is the power factor of the motor? How much induced torque and load torque is produced...

A three phase, 60 Hz, 480 V, Y-connected, two-pole synchronous generator has a synchronous reactance of...

A three phase, 60 Hz, 480 V, Y-connected, two-pole synchronous generator has a synchronous reactance of 0.95 Ω per phase. Its armature resistance is negligible. Its combined friction and windage losses are 1.3 kW and its core losses are 0.95 kW. The field current is constant at no-load. Its full load armature current is 55 A at 0.9PF lagging. Assume phase voltage is a reference. Determine following: a) Its terminal voltage when it is loaded with the rated current at...

A 480 V, 50 Hz, Y-connected six-pole synchronous generator has a per-phase synchronous reactance of 1.0...

A 480 V, 50 Hz, Y-connected six-pole synchronous generator has a per-phase synchronous reactance of 1.0 Ω. Its full-load armature current is 60 A at 0.8 PF lagging. Its friction and windage losses are 1.5 kW and core losses are 1.0 kW at 60 Hz at full load. Assume that the armature resistance (and, therefore, the I2R losses) can be ignored. The field current has been adjusted such that the no-load terminal voltage is 480 V. a. What is the...

A three phase synchronous motor is Y-connected with the following values: 2.3 kV, 400 hp, 60...

A three phase synchronous motor is Y-connected with the following values: 2.3 kV, 400 hp, 60 Hz, 8 poles with a rated pf of 0.85 leading. It is 90% efficient at full load with an armature resistance of 0.80 Ohms and synchronous reactance of 11 Ohms. At full load calculate the output torque, and internal generated voltage (EA)

A 3-phase, 380 V, 50 Hz , 6 pole, Y-connected induction motor has R1 = 0.1...

A 3-phase, 380 V, 50 Hz , 6 pole, Y-connected induction motor has R1 = 0.1 W , X1 = 0.4 W, R2’ = 0.12 W , X2’ = 0.4 W, Xm = 20 W , Pr = 1 kW. The motor is operated at 970 rpm what is the efficiency?

Tests were carried out on a three-phase 220 V, 50 Hz, 4-pole delta-connected induction motor. The...

Tests were carried out on a three-phase 220 V, 50 Hz, 4-pole delta-connected induction motor. The following results were obtained from open circuit (no-load) and short circuit tests. Open Circuit (no-load) Test Applied Stator Voltage VLine (V) Stator Line Current ILine (A) Total Input Power Pin (W) 240 9.6 536 220 7.2 420 200 5.4 352 180 4.3 304 160 3.5 276 140 3.0 248 120 2.5 224 Short Circuit (locked rotor) Test Applied Stator Voltage VLine (V) Stator Line...

A 3-phase, 5 kVA, 208 V, 4-pole, 60 Hz, star-connected synchronous generator has negligible stator winding...

A 3-phase, 5 kVA, 208 V, 4-pole, 60 Hz, star-connected synchronous generator has negligible stator winding resistance and a synchronous reactance of 8 Ω per phase at the rated terminal voltage. The generator is connected in parallel to a 3-phase, 208 V, 60 Hz infinite bus. All losses may be neglected. a) Determine the excitation voltage and the power angle when the machine is delivering rated apparent power at 0.8 PF lagging. b) If the field excitation is increased by...

1- A 480-V, 60-Hz, delta connected, synchronous generator has a synchronous reactance of 0.5 ohm and...

1- A 480-V, 60-Hz, delta connected, synchronous generator has a synchronous reactance of 0.5 ohm and Its rated Line current is 100 A. if the generator is connected to a 480V grid Draw the phasor diagram and find EA, delta angle and output power under the following conditions a- The generator supply the rated current at 0.8 PF lagging. b-The generator supply the rated current at 1.0 PF. c- The generator supply the rated current at 0.8 PF leading.

The parameters of a 3-phase, 4-pole, 50 Hz, Y-connected, wound-rotor induction motor are listed below. These...

The parameters of a 3-phase, 4-pole, 50 Hz, Y-connected, wound-rotor induction motor are listed below. These are the default values of the “Asynchronous Machine” model in MATLAB Simulink. r1=0.5968 ?; r2=0.6258 ?; L1=0.0003495 H; L2=0.005473 H; Lm=0.0354 H; Stator line voltage = 400 V rms. The motor for rotor speeds nm= 0 to 1500 rpm. X1= 0.1097 ohm, X2= 1.719 ohm , Xm= 11.12 ohm, RTH = 0.5853 , XTH = 0.1395 and VTH = 230.82 V. Suppose the motor...

A 400V, 2 pole, 50 Hz, three-phase induction motor is drawing 60 A at 0.85 PF...

A 400V, 2 pole, 50 Hz, three-phase induction motor is drawing 60 A at 0.85 PF lagging. The stator copper losses are 2 kW, the stator core losses are 1.8 kW and rotor copper losses are 700 W. The friction and windage losses are 600 W, the stray loss 100 W, and rotor core loss 100 W. Find the following quantities: a. The air gap power. b. The developed mechanical power. c. The output power. d. The efficiency of the...

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