10. Three shunt generators operating in parallel supply a total load current of 2000 amperes. Each machine has a field resistance of 40 ohms and an armature resistance of 0.02 ohm. The emfs generated are 240, 242 and 245 volts respectively. Determine current delivered by each generator.
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- A 3-phase, 50 Hz,2000 kVA, 2300 volt alternator gives a short circuit current of 600 A for a certain field excitation. For the same excitation, the open circuit voltage was 900 volts. The resistance between pair of terminals was 0.12 ohm. B)If the generator is deltaconnected, -Determine the full load regulation at 0.80 lagging pf. -Determine the full load regulation at unity pf4 DECIMAL PLACES: A 58-kVA, star-connected, 448 V, 3-phase, 50-Hz alternator, the effective armature resistance is 0.625 ohm per phaseThe synchronous reactance is 3.2 ohms per phase and leakage reactance is 0.5 ohm per phase. Determine at rated load and unity power factor: (a) Internal emf Ea(b) No load emf(c) percentage regulation on full-load3-phase,50 Hz, delta connected generator, its stator winding having 12sninai ns pole pair and 6 conductors in each, if the total air gap flux is 160mwb. Find the terminal voltage. The prime mover speed is 750rpm.
- A three-phase, 250 MVA, 16 kV rated synchronous generator is feeding into an infinite bus bar at 15 kV. The generator has a synchronous reactance of 1.62 pu. It is found that the machine excitation and mechanical power input are adjusted to give E = 24 kV and power angle δ = 30 degree. a) Determine the line current and active and reactive power fed to the generator terminal. b) The mechanical power input to the generator is increased by 20% from that in part (a) but its excitation is not changed. Find the new line current and power factor. c) With reference to part (a) current is to be reduced by 20% at the same power factor by adjusting mechanical power input to the generator and its excitation. Determine E, angle δ and mechanical power input. d) With the reduced current as in part (c), the power is to be delivered to generator terminal at unity power factor, what are the corresponding values of E and δ and also the mechanical power input to the generator. Per-unit values are given on…3-phase,50 Hz, delta connected generator, its stator winding having 12 slots per pole pair and 6 conductors in each, if the total air gap flux is 160mwb. Find the terminal voltage. The prime mover speed is 750rpm.36.A 1000-kVA, 11-kV three-phase wye-connected synchronous generator supplies a 600-kW, 0.8 leading of load. The synchronous reactance is 24 Ω per phase and the armature resistance is negligible. Calculate the voltage regulation.
- A 1200 kVA, 6600 volts, 3-phase Y connected alternator, has an effective resistance of 0.4 ohms and a reactance of 6 ohms per phase. It delivers full load current at 0.8 lagging power factor at rated voltage. What will be the terminal voltage for the same excitation and load current, if the power factor is 0.8 leading? Ans.: 4560.22 volts per phase show circuit diagram1. Two shunt generators operating in parallel delivering a total load current of 240 A. One of the generators is rated 50 KW and the other 100 KW. The voltage rating of both machines is 500 V and have regulations of 4% and 6% respectively. Assuming linear characteristics, determine (I) the current delivered by each machine (ii) terminal voltage.A three-phase wye-connected wound rotor synchronous generator rated at 10 KVA, 230 v has synchronous reactance of 1.2 ohms per phase and armature resistance of 0.5 ohm per phase. What is the power factor such that the voltage regulation at full-load is zero?
- Two shunt generators operating in parallel delivering a total load current of 240 A. One of the generators is rated 50 KW and the other 100 KW. The voltage rating of both machines is 500 V and have regulations of 4% and 6% respectively. Assuming linear characteristics, determine (i)the current delivered by each machine (ii) terminal voltage.The effective resistance of a 2200 V, 50 Hz, 440 KVA, 1 -phase alternator is 0.5 ohm. On short-circuit, a field current of 40 A gives the full load current of 200 AS. The electromotive force on open-circuits with same field excitation is 1160 V. Then the synchronous impedance and reactance is _______ ohm and _______ ohm respectively.A 4-pole, 36-slot, 60-Hz, three-phase, Y-connected, synchronous generatorhas 10 turns per coil. The flux per pole is 50 mWb. For a series connection,determine (a) the synchronous speed, (b) the per-phase voltage, and (c) theline voltage