I would guess the tightest control loop is on the generator stator field windings, with mechanical control being secondary. Definitely a lot of poles and zeros to worry about.
On Wed, Apr 5, 2017 at 9:01 AM, jimlux <jim...@earthlink.net> wrote: > On 4/4/17 2:28 PM, Thomas D. Erb wrote: > >> Thanks for the info. >> >> >> So that tells me how data is recorded - but not how the frequency is kept >> stable ? >> >> Is the line frequency now directly tied to GPS clock - with no drift ? >> > > The line frequency is adjusted, for the most part, by adjusting the prime > power (steam valves, dam penstocks, etc.) on the generators at power > stations. That changes the speed, slightly, although as generator 1 of N > starts to get ahead, the electrical load increases, and it slows down. > > It's actually a pretty complex system, since there are a whole raft of > "spring constants" in between the multiple generators in a system, there's > phase shifts due to transmission line inductance and capacitance. > > "Stabilizing" a system in the face of changing demand is a non-trivial > task. > > > > > > > >> Thomas D. Erb >> t...@electrictime.com<mailto:t...@electrictime.com> / >> Electric Time Company, Inc. >> Office: 508-359-4396 x 117 / Fax: 508-359-4482 >> 97 West Street Medfield, MA 02052 USA >> www.electrictime.com<http://www.electrictime.com> >> [Facebook]<https://www.facebook.com/pages/Electric-Time- >> Company-Inc/127918073950854?ref=hl>[Twitter]<https:// >> twitter.com/tower_clocks>[pinterest]<https://www. >> pinterest.com/electrictime/> >> [htmlsig.com]<http://www.electrictime.com/> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/listinfo/time-nuts >> and follow the instructions there. >> >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.