exp 58

exp 58 - Experiment 58 Alternator Synchronization OBJECTIVE...

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Experiment 5 8 Alternator Synchronization OBJECTIVE To learn how to synchronize an alternator to the electric power utility system. To observe the effects of improper phase conditions upon the synchronizing Pro'===. The frequency of a large electric power utility system is established by the speed of mtation of many powerhtl alternators all connected by various tie-limes into the total network. The collective inertia and power of these generators is so great that there is no single load or disturbance which would be targe enough to change their speed of rotation. The frequency of an electric system Is, therefore, remarkably stable. An attemator can only deliver power to an existing electric power system if it operates at the same frequency as the system. A system whose Is 60 Hz cannot receive power from an alternator operating at 60.001 Hz. They must both operate at exactly the same frequency. This is not as dicult to reallze as may first appear, because automatic forces come Into play when an alternator is connected into an existing system to keep its frequency constant. Synchronization of an altemator with a large utility system, or Tnfinite buss" as it is called is analogous to meshing a small gear to another of enormous size and power. If the teeth of both gears are property synchronized at the moment of contact, then the meshing yill be smooth. But should tooth meet twth at the critical instant, shock will result with possible damage to the smaller gear. Smooth synchronization of an attemator means first that its frequency must be equal to that of the supply. In addition, the phase sequence (or
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exp 58 - Experiment 58 Alternator Synchronization OBJECTIVE...

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