Electric Power
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 Power Plant Electrical Design Training Book Course CD US $7.95 
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 VARIOUS GM MODEL Power Electric Window Lift Motor NEW US $34.95
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 Door Access System Electric Power Supply Controller US $36.82
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How electric power transfer through wires from a power station?
Is it possible to transfer electric power through wires in frequencies?
No, the frequency, 60 Hz in the U.S., is never changed. Eventhough a higher frequency will make transformers more efficient, the seemingly unrelated metalurgy technology of our generation allows only 60 Hz. It is optimal because it corresponds to 3600 RPM (distributed into 3 phases) of most metal based generators. Recall the Ford Model T taken as an aircraft-fan engine that got its crankshaft broken at very light load but at metal's natural frequency (the current bottleneck) not much above 3600 Hz.
What changed is the gross amplification of voltage, to hundreds of KV, in exchange for a reduction of current; so that, for the same power, the long distant wires can be much smaller in size.
The sequence is as follows: (1) harness or generate the mechanical rotation energy, (2) normalize the RPM against the count of coils in a circle so to make a balanced 3 phase 60 Hz, (3) run through stages of transformers to amplify the voltage to the public utility grid level, (4) contract and sell it to the grid so it can be gauged and switched in, (5) step it down when reaching local grids, and then down again to 110V / 220V for one/three phase (the 120 degree phasor vectors make them more like 115V / 200V) for household or factory use.
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December 21st, 2003 in
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