Talk:Utility frequency

Invention of the load-frequency control
The current text states, The general control algorithm for LFC was developed by Nathan Cohn in 1971, referencing just the Cohn's work. However, the LFC with ACE was known well before that (it is easy to find the descriptions that date to early 1960s). So a reliable third party source is needed to credit Cohn with this invention. Викидим (talk) 22:45, 25 March 2023 (UTC)


 * Many months, still without a proper source. Removing the statement. Викидим (talk) 00:52, 20 July 2023 (UTC)

How?
"This is used by some clocks to accurately maintain their time." How is time accurately maintained when frequency is variable? 122.151.210.84 (talk) 12:26, 19 July 2023 (UTC)


 * Frequency is steered to keep the clocks on time. In older days, the powerhouse had a clock with a synchronous motor. They tweaked the frequency up or down as needed to keep that clock synced with some reliable time reference such as radio signals from the National Bureau of Standards.  Today if the clocks get more than ten seconds behind, the grid is heavily overloaded. Constant314 (talk) 13:51, 19 July 2023 (UTC)


 * This also speaks to the variability of the term "accurate". In a typical residential home, there is (largely), no need for a clock to be precise to milliseconds - or even seconds. As long as a wall clock - frequently without a seconds hand - is within a minute or so of the correct time, the average person is very unlikely to notice. Grid frequency is more than adequate as a synchronizer in such day-to-day usage. cheers. anastrophe, an editor he is. 18:09, 19 July 2023 (UTC)
 * The glorious details are in Time control (electrical grid) Викидим (talk) 19:26, 19 July 2023 (UTC)

5000 alterations equals 41 2⁄32 Hz?
In the section 40Hz there is a sentence that purports that 5000 alterations per minute are 41 and two thirds Hertz, but I don't understand how this can be the case. Hertz being the number of alterations in a second meaning that in one minute at 1 hertz there would be 60 alterations.

Conversely, 5000 alterations in a minute would correspond to 83 and 1/3 Hertz Aethalides (talk) 18:58, 15 April 2024 (UTC)


 * Maybe 5000 RPM with a four-pole machine? Removed, in any case. Constant314 (talk) 20:08, 15 April 2024 (UTC)
 * "alterations" includes plus swings and minus swings and is twice the number of cycles in 1 minute. --Wtshymanski (talk) 22:42, 22 April 2024 (UTC)
 * Thanks for the explanation. I would have never guessed that.  Can you add a note? Constant314 (talk) 23:03, 22 April 2024 (UTC)
 * can you find a citation for that because as I understand it, Hertz is number of alterations per seconds i.e.50hz is 50 alterations, not 100 Aethalides (talk) 06:02, 23 April 2024 (UTC)
 * "Hertz" is the number of *cycles* per second, a cycle has a positive swing and a negative swing -two alterations. I will try to track down the musty book that I had explaining this, but the mildew may have gotten to it. Google Books used to have complete text of century-old periodicals but now shows only useless snippets. --Wtshymanski (talk) 02:03, 15 May 2024 (UTC)