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determine the distribution factor of the alternator winding of a 3 phase alternator having 8 slots per pole per phase Subject: Electrical machine 2

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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determine the distribution factor of the alternator winding of a 3 phase alternator having 8 slots per pole per phase Subject: Electrical machine 2

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A 3-phase, 16 pole alternator has a star connected winding with 144 slot and 10 conductor per slot. The flux per pole is 30 mWb sinusoidally distributed and the speed is 375 rpm. The frequency of generated emf is? Also find, the line emf is?
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4. A 3-phase 50 Hz star connected alternator has 180 conductors per phase and flux per pole is 0.0543 Wb. Find i) e.m.f generated per phase and ii) e.m.f between line terminals. Assume the winding to be full pitched and distribution factor to be 0.96.
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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.
If you have 3-phase power and you need to step down (or up) in 3-phase voltage, how many single-phase transformers are needed? Explain.