01-31-2015, 07:45 PM
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Peanut Head
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Join Date: Nov 2002
Location: Paragould, Arkansas
Posts: 1,746
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If I remember right....25 cycle was common in rural areas. Don't know why though. Found this though...
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The first generators at the Niagara Falls project, built by Westinghouse in 1895, were 25 Hz because the turbine speed had already been set before alternating current power transmission had been definitively selected. Westinghouse would have selected a low frequency of 30 Hz to drive motor loads, but the turbines for the project had already been specified at 250 RPM. The machines could have been made to deliver 16⅔ Hz power suitable for heavy commutator-type motors but the Westinghouse company objected that this would be undesirable for lighting, and suggested 33⅓ Hz. Eventually a compromise of 25 Hz, with 12 pole 250 RPM generators, was chosen. Because the Niagara project was so influential on electric power systems design, 25 Hz prevailed as the North American standard for low-frequency AC.
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Let me live in the house beside the road and be a friend to man.
Last edited by Celt; 01-31-2015 at 07:50 PM.
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