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5) When supplying power at 33 degrees to the 480V bus, the three phase two-pole 50...
e connected, 60 Hz, 2300 volt, sik pole, cylindrical rotor synchronous motor is 8 leading, neglect losses, the synchronous reactance is 2.5 sand Fp ohm/phase. Determine: (a) Synchronous speed-n, (b) Developed torque in Horsepower Tmec (c) Active Power-P (d) Apparent Power-S (e) Reactive Power-Q (f) Draw the Power Triangle (g) Armature current-1 (h) Excitation voltage-Et (i) Power Angle-8 U) Draw the phasor diagram e connected, 60 Hz, 2300 volt, sik pole, cylindrical rotor synchronous motor is 8 leading, neglect losses,...
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)...
Electric Machines - Synchronous Motors 4. A 150 kVA, 460-V, four pole, 60 Hz, three phase, Y-connected synchronous motor operatingat rated load has a synchronous reactance of 1.20 ohms/phase, determine: Excitation voltage Power angle Pull-out torque Draw a phasor diagram a. b. c. d. 4. A 150 kVA, 460-V, four pole, 60 Hz, three phase, Y-connected synchronous motor operatingat rated load has a synchronous reactance of 1.20 ohms/phase, determine: Excitation voltage Power angle Pull-out torque Draw a phasor diagram 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 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
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 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...
1. A 3-phase, 6-pole, 50-Hz, 500 kVA , 6600 V, star-connected synchronous motor has a synchronous impedance of j80 ohms per phase. For unity power factor :(i) Determine the mechanical torque neglecting all machine losses (ii) If this torque can be assumed constant, what would be the motor back emf and load angle for (a) 0.9 power factor lag and (b) 0.9 power factor lead? (iii) How will the maximum torque be affected in both cases?
1. A 3-phase, 6-pole, 50-Hz, 500 kVA , 6600 V, star-connected synchronous motor has a synchronous impedance of j80 ohms per phase. For unity power factor :(i) Determine the mechanical torque neglecting all machine losses (ii) If this torque can be assumed constant, what would be the motor back emf and load angle for (a) 0.9 power factor lag and (b) 0.9 power factor lead? (iii) How will the maximum torque be...
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...