please solve asap 2) An alternator is supplying a load of 300 kW at a p.f. of 0-6 lagging.If the power factor is raised to unity, how many more kilowatts canalternator supply for the same kVA loading ?

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Answered: 2) An alternator is supplying a load of…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter31: Three-phase Alternators

Section: Chapter Questions

Problem 1RQ: What conditions must be met before two alternators can be paralleled together?

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Similar questions

A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)
Alternator A (100 kVA, 3-f, 240 V, 60 Hz, 1800 rpm) is operating in parallel with alternator B (125 kVA, 3-f, 240 V, 60 Hz, 1800 rpm). The load of alternator A is 70 kW at 85% pf leading and the load of alternator B is 85 kW at 75% pf leading. Determine the pf of load.
The dc armature resistance of delta-connected alternator measured across its two terminal is 0.8 ohm. The effective resistance per phase is?
A three-phase, star-connected alternator has 6 number of poles, armature with 160 slots and 6 conductors per slot. The speed of rotation is 1000 rpm. The flux per pole is 0.06 weber. If the winding factor is 0.92 and all the conductors in each phase are in series. Calculate a) Frequency of generationAnswer for part 1 b) Number of turnsAnswer for part 2 c) EMF generated (phase voltage)Answer for part 3 d) EMF generated (Line voltage)
A three-phase star-connected alternator delivers at rated load a current I = 200 A under a voltage of 5 kV-50 Hz (between phases). The load is inductive of power factor equal to 0.87, the resistance of each stator winding is 0.292 and the speed of the rotor is n = 750 r.p.m. The sum of the constants losses and the stator Joule's losses and the rotor Joule's losses is 55 kW. The no load test, at rated frequency, gave: E-4200 V (between phases) for an excitation current lexc = 40 A. The short-circuit test, for an excitation current lexc = 40 A, gave a short-circuit current in the stator windings Ise =2.5 kA. 1- Calculate the numbers of poles of the alternator. 2- Calculate the synchronous reactance (X). 3- Calculate the electromotive force of the alternator (E) between phases for the same excitation current. 4- Calculate the power absorbed by the alternator (Pa).
3. What are the main effects of losses on the performance of the alternator?
Find the rms value of the induced emf per phase of a 10 pole, three phase, 50 Hz alternator with 2 slots per pole per phase and 4 conductors per slot in two layers. The coil span is 150°. The flux per pole is 0.12 Wb (a) 994 (c) 1020 53. (b) 864 (d) 960
Q5: A 3-phase, 50 Hz, 8-pole alternator has a star-connected winding with 120 slots and 8 conductors per slot.The flux per pole is 0.05 Wb, sinusoidally distributed. Determine the phase and line voltages.
A 3-phase, 16-pole alternator has a wye connected armature winding with 144 slots, 10 conductors per slot and runs at 450 rpm. The flux is 40 mWb per pole and the distribution factor is 0.966. What value of the line-to-line voltage in kV?
Two identical three – phase Y – connected alternator A and B share equally a load of 10MW at 33kV and 80% lagging pf. The synchronous reactance of each machine is 4 ohms per phase and thew armature resistance is negligible. Alternator A has its filed excitation adjusted to carry 125 A lagging current, what is the current supplied by alternator B? a. 96 A b. 97 A b. 98 A d. 95 A
7. A 3-phase, Y-connected. 2-pole alternator runs at 3,600 r.p.m. If there are 500 conductors per phase in series on the armature winding and the sinusoidal flux per pole is 0.1 Wb. calculate the magnitude and frequency of the generated voltage from first principles. [60 Hz; 11.5 kV]
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2) An alternator is supplying a load of 300 kW at a p.f. of 0-6 lagging. If the power factor is raised to unity, how many more kilowatts can alternator supply for the same kVA loading ?