H.W.The table gives data for open-circuit and load zero power factortests on a 6-pole, 440 V, 50 Hz, 3-phase star-connected alternator. The effective ohmicresistance between any two terminals of the armature is 0.3.786「?「6 「10 」「12 「 1440474 530Field current(A)24O.C.terminalvoltage (V)156 288396440S.C.line11 2234404646current (A)Zero p.f.terminalI-1-1060voltage (V)568 59257698016"18161-80206314398460504Find the regulation at full-load current of 40 A ai 0.8 power factor lagging using(a) synchronous impedance method,(b) mmf method,(c) Potier-triangle method

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Answered: H.W.The table gives data for…

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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What conditions must be met before two alternators can be paralleled together?
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A single phase, 2000 V alternator has armature resistance and reactance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 A load at 0.8 leading power factor is ??
2.
There are 160 slots in a 3-phase, 8-pole, 50 Hz., star connected alternator. There are 4 conductors in each slot and all the conductors in a phase are connected in series. Coil span is 150° electrical and the flux per pole is 0.08 Weber sinusoidally distributed. Calculate the emf induced per phase.
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8. Calculate the open circuit line voltage of a 4-pole, 3-phase, 50 Hz star connected alternator with 36 slots and 30 conductors per slot. The flux per pole is 0.05 Wb sinusoidally distributed.
A/ 10 MVA, 11 KV, 50 Hz, 3-phase star-connected alternator s driven at 300 RPM. The winding is housed in 360 slots and has 6 conductors per slot, the coils spanning (5/6) of a pole pitch. Calculate the sinusoidally distributed flux per pole required to give a line voltage of 11 kV on open circuit, and the full load current per conductor.
A 1200 kVA, 6600 volt, 3-phase, Y-connected alternator has an effective resistance of 0.40 ohm and a reactance of 6 ohms per phase. It delivers full load current of 0.80 lagging power factor at rated voltage. What will be the terminal voltage for the same excitation and load current if the power factor is 0.80 leading? a. 4,560 V b. 9,878 V c. 7,898 V d. 4,250 V
Two identical, 3-phase, Y-connected alternators A and B share equally a load of 10MW at 33kV at 0.8pf lagging. The synchronous reactance of each machine is 4 ohms per phase and the armature resistance is negligible. Alternator A has its field excitation adjusted to carry 125A lagging current. What is the current supplied by alternator B?
A three-phase, wye connected alternator is rated at 720 kVA, 2400 V, 60 Hz. At the rated load, determine: the output, in kilowatts, at 80% lagging power factor. the full-load line current. the full-load current rating of each of the three windings. the voltage across each winding
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