Problem 1 and an armature resistance of O.l A synehronous machine Ω per phase. If E.....
Problem 1. (25 points) A 200-hp 440-V 0.8-PF-leading љс0nnected synchronous motor has an armature resistance of 0.6 Ω and a synchronous reactance of 8.0 Ω. Its efficiency at full load is 90 percent. 1. What is the input power to the motor at rated conditions? 2. What is the line current of the motor at rated conditions? What is the phase current of the motor at rated conditions? 3. What is the reactive power consumed by or supplied by the...
A 13.8 kV, 10 MVA, 0.8 pf lagging, 60 Hz two-pole star-connected steam-turbine generator has a synchronous reactance of 12 Ω per phase and an armature resistance of 1.5 Ω per phase. This generator is operating in parallel with a large power system (infinite bus). At the absolute maximum power possible, how much reactive power will this generator be supplying or consuming? Sketch the corresponding phasor diagram. (Assume IF is still unchanged.)
Please correctly answer question and post all steps! Will rate! Thanks! 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...
Problem 7 (Chapter 5: Three-Phase Synchronous Motors) A 440 V, 124 HP, 4 poles, 50 Hz, 0.9 leading Power Factor, A-connected synchronous motor has an armature resistance of 0.05 12, and a synchronous reactance of 1.5 12. This motor is operating at its rated conditions with an efficiency of 92 %. 1. Calculate the electrical input power. 2. Find the RMS phase and line currents. 3. What is the reactive power consumed by or supplied by this motor? 4. Calculate...
Q3) A 400-V, 3-phase, 50-HZ, 4-pole Y-connected synchronous machine is operated as a motor and draws 27A at 0.77 PF leading. The motor armature resistance is 0.50/Phase and synchronous reactance is j12Ω /phase. The rotational loss is 200 watts. The field winding has a resistance of 0.4Ω and is supplied by 50V DC sources. Determine the following: a) Real and reactive power drawn by the motor b) The power developed c) The torque angle d) The shaft torque e) Efficiency...
A 60-MVA, 69.3-kV, three-phase synchronous generator has a synchronous reactance of 15 Ω/phase and negligible armature resistance. -a. The generator is delivering rated power at 0.8 power factor lagging at the rated terminal voltage to an infinite bus bar. Determine the magnitude of the generated emfper phase and the power angle δ. -b. If the generated emfis 36 kV per phase, what is the maximum three-phase power that the generator can deliver before losing its synchronism? Winter
A 100 k VA, 1100 V, three-phase, 6-pole, Y-connected, 50 Hz synchronous machine has synchronousreactance of 6 92 per-phase and negligible armature resistance. Its core losses are 7 k W and itsfriction and windage losses are 8 kW. The speed droop is 2.5%.Initially the machine is operated alone as a generator and the field current is adjusted such that theno-load voltage equals the rated voltage.a) If the generator is supplying a line current of $2.5 A at 0.85 PF lagging....
b) A 1MW, 3300 V, 50 Hz, wye-connected, 3-ф, twenty four-pole, synchronous motor has a synchronous reactance of 3.24 2 per phase. Assume armature resistance is negligible. This machine is connected to an infinite bus-bars at 3300 V. Its field excitation is adjusted to provide P.F-1 at rated load Calculate: 0 the internal generated voltage EA and armature current la at rated conditions (S marks) ii) the maximum power and torqu e that the motor can deliver with its Ir...
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
2.3 (20 points) A separately-excited de motor is mechanically coupled to a three-phase, 4-pole, 30-kVA, 460-V, round-rotor synchronous generator. The de motor is connected to a constant 230-V de supply The ac generator is connected to a 460 V, fixed-voltage, fixed-frequency, three-phase supply. The synchronous reactance of the synchronous generator is 513 Ω/phase. The armature resistance of the de motor is 30 m2. The 4-pole de machine is rated 30 kW at 230 V. All unspecified losses are to be...