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1- A 25-kVA, 3-phase, wye-connected, 400-V alternator has a synchronous reactance of 1.6 ohms per phase....
A 25-kVa, 3 phase , wye connected, 400 V alternatorr has a synchronous reactance of 1.6 ohms per phase. the alternator is to have zero voltage at half load. neglecting the armature resistance, find the operating power factor and developed power
A wye-connected 200 kVA, 440 V, 3-phase alternator yields 150 V between the terminals on short circuit. With the field excitation unchanged, the short circuit current is 300 A. The ohmic resistance of this machine between line terminals is 0.10 ohm and the ratio of the effective to ohmic resistance is 1.25. Calculate the full load terminal voltage of the machine when the excitation is adjusted to yield a no-load of 500 volts between lines and the power factor is...
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a winding resistance of 0.3 Q and a synchronous reactance of 0.6 on a per phase basis. Determine its voltage regulation at full load when the power factor is (a) 75% lagging and (b) 75% leading. B) (10 marks) A 220-V, Y-connected, three-phase, synchronous motor has a synchronous reactance of 4 O/phase and negligible armature winding resistance. At a certain load the motor takes 7.5...
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A 480 V, 375 kVA, Y-connected synchronous generator has a synchronous reactance of 0.4 Ω and a negligible armature resistance. This generator is supplying power to a 480 V, 80 kW, Y-connected synchronous motor with a synchronous reactance of 1.1 Ω and a negligible armature resistance. The synchronous generator is adjusted to have a terminal voltage of 480 V when the motor is drawing the rated power at unity...
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.
A three-phase, 5 kVA, 208 V, four-pole, 60 Hz, wye-connected synchronous machine has negligible stator winding resistance and a synchronous reactance of 8 Wper phase. It is operated in parallel with a three-phase, 208 V, 60 Hz power supply.Determine the excitation voltage and the power angle when the machine is delivering rated kVA at 0.8 pf lagging. Draw the phasor diagram
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...
A three-phase, 318.75-kVA, 2300-V alternator has an armature resistance of0.35 /phase and a synchronous reactance of 1.2 /phase. Determine the no-loadline-to-line generated voltage and the voltage regulation at(a) Full-load kVA, 0.8 power factor lagging, and rated voltage.(b) Full-load kVA, 0.6 power factor leading, and rated voltage
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...
4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and 1800 rpm. Each winding has an armature resistance of 0.0522 and a synchronous reactance of 0.612. Draw the phasor diagram with values, show torque angle and determine the induced voltage for the condition of rated load. (30 pts)