A 750-kVA, 11-kV, 4-pole, 3-phase, star-connected alternator has percentage resistance and reactance of 1 and 15...
- A 750-kVA, 11-kV, 4-pole, 3-phase, star-connected alternator has percentage resistance and reactance of 1 and 15 respectively. Using approximate method, calculate the synchronising power and torque per mechanical degree of displacement at full-load 0.8 pf lag. The terminal voltage in each case is 11 kV.
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A 750-kVA, 11-kV, 4-pole, 3-phase, star-connected alternator
has percentage resistance and reactance of 1 and 15...
3 A 11-KV, has a full-load quadrature-axil IV. three-phase, 20-pole, star-connected, salient-pole synchronous alternator full-load current...
3 A 11-KV, has a full-load quadrature-axil IV. three-phase, 20-pole, star-connected, salient-pole synchronous alternator full-load current of 1000 A The resistance of the rotor is 1,2 phase The rature-axis synchronous reactance per phase is 4.8 and the direct-axis nchronous reactance per phase is 3, 62 Determine for a lagging power factor of 0,8 a) the load angle, b) the developed power, c) the reluctance torque, and d) the voltage regulation СНАР 245 MM401EE
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.5Q/phase and a...
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
A 2000 kVA, 3 phase 8 pole alternator runs at 750 rpm in parallel with other...
A 2000 kVA, 3 phase 8 pole alternator runs at 750 rpm in parallel with other machines Mines on 6000 V bus-bars. Find the synchronizing power on full-load at pl. of 0.8 lagging per mechanical degree of displacement and the corresponding synchronising torque.Reactance of the machine is 6 ohms per phase.
1- A 25-kVA, 3-phase, wye-connected, 400-V alternator has a synchronous reactance of 1.6 ohms per phase....
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...
A 3-phase, 7 kVA, 400 V, 2-pole, star-connected synchronous machine has negligible armature resis...
A 3-phase, 7 kVA, 400 V, 2-pole, star-connected synchronous machine has negligible armature resistance and Xs-60/phase at rated terminal voltage The machine first runs as a generator in parallel with 3-phase, 400 V, 50 Hz power supply 111 Determine the generated voltage and torque angle of the machine operating as a generator, delivering rated kVA at 0 9 pf lagging Draw and label the corresponding phasor diagram for this condition 1 12 If the field excitation is increased by 18%...
A 1,500 kVA, 3-phase alternator is connected to an infinite busbar at constant voltage of 11,000...
A 1,500 kVA, 3-phase alternator is connected to an infinite busbar at constant voltage of 11,000 volts. The resistance and reactance per phase are 0.10 ohm and 2.4 ohms respectively. Find (a) the maximum external load that the machine can supply when the machine is excited to give an emf of 12,500 volts, (b) the current and pf at the maximum output.
A 400 v, 50 Hz, three phase alternator, rated at 75 kVA, is star connected and...
A 400 v, 50 Hz, three phase alternator, rated at 75 kVA, is star connected and driven at 1000 r/min. The windings of the alternator have a resistance, per phase, of 0.03 Ω and synchronous reactance, at 50 Hz per phase, of j0.325 Ω. The stator of the alternator has 108 slots, with 8 conductors, per slots, in a double layer. The maximum pole flux is 8.772 x 10-3 Wb. To improve the wave form only 80% of the pole...
Problem 2. A 3-phase star-connected turbo-generator feeds power to 11 kV infinite bus, through two parallel...
Problem 2. A 3-phase star-connected turbo-generator feeds power to 11 kV infinite bus, through two parallel transmission lines each having a reactance of452. The generator synchronous reactance is 3 Ω. (a) The mechanical input to alternator and its excitation are adjusted as that the operating power factor at alternator terminals is unity and rated current of 500 A is delivered. Calculate the alternator terminal and excitation voltages. Also determine the active and reactive powers delivered to the infinite bus. (b)...
E1Q2 1 0 7 1. A 20 MVA, 6.9 KV 3-phase 4-pole star connected synchronous motor...
E1Q2
1 0 7 1. A 20 MVA, 6.9 KV 3-phase 4-pole star connected synchronous motor is operating with field current of 20 Amps, at full load and 0.9 power factor leading. The motor has a synchronous reactance of 1.5 ohm and negligible armature resistance. 30 points a. Find the motor full load torque and power angle. b. If the field current is increased by 15% and the load torque is increased by 15% find the motor current and power...
A 1500 kW, unity pf, 3-phase, Y-connected, 2300 V-(line), 30 pole, 60 Hz synchronous motor has...
A 1500 kW, unity pf, 3-phase, Y-connected, 2300 V-(line), 30 pole, 60 Hz synchronous motor has a synchronous reactance of 1.95 22/phase. For this problem all losses may be neglected. a. Compute the max. torque in Nm which this motor can deliver if it is supplied with power from an infinite bus, and if its field excitation is constant at the value which would result in unity (1.0) pf at rated load. b. Now, suppose that the motor is supplied...
3 A 11-KV, has a full-load quadrature-axil IV. three-phase, 20-pole, star-connected, salient-pole synchronous alternator full-load current of 1000 A The resistance of the rotor is 1,2 phase The rature-axis synchronous reactance per phase is 4.8 and the direct-axis nchronous reactance per phase is 3, 62 Determine for a lagging power factor of 0,8 a) the load angle, b) the developed power, c) the reluctance torque, and d) the voltage regulation СНАР 245 MM401EE
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
A 3-phase, 7 kVA, 400 V, 2-pole, star-connected synchronous machine has negligible armature resistance and Xs-60/phase at rated terminal voltage The machine first runs as a generator in parallel with 3-phase, 400 V, 50 Hz power supply 111 Determine the generated voltage and torque angle of the machine operating as a generator, delivering rated kVA at 0 9 pf lagging Draw and label the corresponding phasor diagram for this condition 1 12 If the field excitation is increased by 18%...
Problem 2. A 3-phase star-connected turbo-generator feeds power to 11 kV infinite bus, through two parallel transmission lines each having a reactance of452. The generator synchronous reactance is 3 Ω. (a) The mechanical input to alternator and its excitation are adjusted as that the operating power factor at alternator terminals is unity and rated current of 500 A is delivered. Calculate the alternator terminal and excitation voltages. Also determine the active and reactive powers delivered to the infinite bus. (b)...
E1Q2
1 0 7 1. A 20 MVA, 6.9 KV 3-phase 4-pole star connected synchronous motor is operating with field current of 20 Amps, at full load and 0.9 power factor leading. The motor has a synchronous reactance of 1.5 ohm and negligible armature resistance. 30 points a. Find the motor full load torque and power angle. b. If the field current is increased by 15% and the load torque is increased by 15% find the motor current and power...
A 1500 kW, unity pf, 3-phase, Y-connected, 2300 V-(line), 30 pole, 60 Hz synchronous motor has a synchronous reactance of 1.95 22/phase. For this problem all losses may be neglected. a. Compute the max. torque in Nm which this motor can deliver if it is supplied with power from an infinite bus, and if its field excitation is constant at the value which would result in unity (1.0) pf at rated load. b. Now, suppose that the motor is supplied...
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