Question

A salient-pole synchronous machine with negligible armature resistance has the following parameters all expressed in the...

A salient-pole synchronous machine with negligible armature resistance has the following parameters all expressed in the per unit system: xd =Lis, Xq = 0.95

The machine is connected to a transmission line represented by: A = 0.98L0.2°, B = 0.2L85°

The load at the end of the line draws a current of 1 pu at a voltage of 1 pu. The load power factor is unity. Calculate the apparent power output of the machine.

a-. Calculate the required excitation voltage and torque angle.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A 3 phase 11 kv,25 mva, 60 Hz salient pole synchronous motor is running from a...
A 3 phase 11 kv,25 mva, 60 Hz salient pole synchronous motor is running from a 11 Kv, 60 Hz balanced three phase supply the meachince reactances are Xd=1.2 pu and Xq=0.6 pu ,neglect the meachanicalloss and armature copper loss the maximum power input is obtained with no field excitation determine the power factor of motor
A three phase Y connected synchronous motor has negligible armature resistance and a synchronous reactance of...
A three phase Y connected synchronous motor has negligible armature resistance and a synchronous reactance of 12 ohm/phase. The motor takes 12,000kW at a line voltage of 13,200V. If the line current is adjusted so that the excitation voltage is 9000V/phase: a. What is the torque angle? b. At what power factor is the motor operating? c. What is its armature current?
A salient pole synchronous machine is connected to an infinite bus whose voltage is kept constant...
A salient pole synchronous machine is connected to an infinite bus whose voltage is kept constant at 1.00 pu. The reactances Xcl and Xq are 0.95 and 0.4 respectively .The table given below relates to three operating conditions of the machine. (Q2 is the reactive power at machine terminals) Complete Table (1,) neglecting armature reaction. p Qz E g Condition A ? 0.0 1.08 ? Condition B 1.45 ? ? 45deg Condition C ? ? 1.3 37.5deg
A 20kW. 3-phase, +40 V. 4 pole, delta-connected permanent magnet synchronous motor has following parameters Xs=5...
A 20kW. 3-phase, +40 V. 4 pole, delta-connected permanent magnet synchronous motor has following parameters Xs=5 ohm, Rs negligible  rated power factor = 1.0. Machine is controlled by variable frequency control at a constant (V/f) ratio. Calculate (i) Armature current. torque angle and power factor at half full load torque and 750 rpm. (ii) armature current, torque angle and power factor at half full load torque and 1000 rpm. (iii) The braking torque, torque angle and power factor when working under...
A 3- phase, 2 pole Y-connected synchronous machines has a line-line voltage of 6,000V in 60Hz...
A 3- phase, 2 pole Y-connected synchronous machines has a line-line voltage of 6,000V in 60Hz power line, has an armature reactance of 2ohms/ phase and negligible armature resistance. Compute the following A) In case of generating action if the line current is 385 A at a leading power factor of 0.8, the armature voltage per phase is 3464V, Compute the voltage per phase and power angle. B) Draw the phasor diagram. C) If the losses in the machine is...
A 3-phase, 5 MVA, kV, 60 Hz synchronous machine has a synchronous reactance of 10 ohms...
A 3-phase, 5 MVA, kV, 60 Hz synchronous machine has a synchronous reactance of 10 ohms per phase. The machine is connected to kV, 60 Hz bus and is operated as synchronous condenser (synchronous motor at no-load condition) a. For normal excitation (excitation voltage terminal voltage), find the line current. Draw the phasor diagram b. If the excitation is increased to 150% of the normal excitation, find the line current and reactive power delivered or absorbed by the bus. Draw...
A submarine has a 3-phase, Y-connected, 2- pole, 60Hz synchronous generator rated to deliver 1687.5 kVA...
A submarine has a 3-phase, Y-connected, 2- pole, 60Hz synchronous generator rated to deliver 1687.5 kVA at a FP = 0.8 lagging with a line voltage of 450-V. The machine stator resistance RS = 0.004 ?. The synchronous reactance is Xs=0.08 ?. The actual system load on the machine draws 900 kW at FP = 0.6 lagging. Assume that a voltage regulator has automatically adjusted the field current so that the terminal voltage is its rated value. Mechanical losses are...
A separately excited DC motor has the following parameters: field resistance = 250 ?, armature resistance...
A separately excited DC motor has the following parameters: field resistance = 250 ?, armature resistance = 0.03 ?, terminal voltage = 250 V and field voltage = 250 V. Initially the machine runs at 1000 rpm with the terminal voltage = 250 V and armature current = 120 A. a) find the speed of the motor if the load torque dropped to 50% of its original value, b) find the speed of the motor if the armature voltage is...
Please be clear in conceot and handwriting, thank you. A 20 kVA three-phase synchronous machine is...
Please be clear in conceot and handwriting, thank you. A 20 kVA three-phase synchronous machine is connected to a 480 V, 60 Hz electrical service. The per-phase armature reactance is 80%. Armature resistance is negligible, as are all other sources of power loss. Part A: Motor Configuration The machine is configured to run as a motor. Its rated mechanical power is 20 HP and it is 94% efficient. The motor provides rated output mechanical power. The excitation is set such...
A 50-Hz, two-pole, 825 kVA, 2300 V, three-phase synchronous machine has a synchronous reactance of 7.47...
A 50-Hz, two-pole, 825 kVA, 2300 V, three-phase synchronous machine has a synchronous reactance of 7.47 and achieves rated open-circuit terminal voltage at a field current of 147 A. c. For a constant load power of 700 kW, write a MATLAB script to plot the terminal current as a function of field current. For your plot, let the field current vary between a minimum value corresponding to a machine loading of 825 kVA, leading power factor, and a maximum value...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT