On Mon, Jun 20, 2016 at 10:36:13PM -0400, Alvin Starr via talk wrote: > On 06/20/2016 10:29 PM, Peter Renzland via talk wrote: > >>On Jun 20, 2016, at 20:31, Michael Galea via talk <talk@gtalug.org> wrote: > >>Someone remarked that the accuracy of 60 hz is good, and that > >>over-frequencies would cancel under-frequencies. I would really doubt that > >>they could do that to any great degree of accuracy. The grid is the largest > >>machine on Earth, and there is more than just a single generator. > >https://en.wikipedia.org/wiki/Utility_frequency#Long-term_stability_and_clock_synchronization > > > > > https://www.ospe.on.ca/public/documents/presentations/electrical-grid-part-1.pdf > around slide 40. > It does not give a specific number for the "dead band" > > -- > Alvin Starr || voice: (905)513-7688 > Netvel Inc. || Cell: (416)806-0133 > al...@netvel.net || >
Out of interest, here are the frequencies the grid had each minute in the last 1-2 days. # grep "FREQ value 59\.94" /tmp/MGC* |wc -l 0 # grep "FREQ value 59\.95" /tmp/MGC* |wc -l 16 # grep "FREQ value 59\.96" /tmp/MGC* |wc -l 99 # grep "FREQ value 59\.97" /tmp/MGC* |wc -l 282 # grep "FREQ value 59\.98" /tmp/MGC* |wc -l 464 # grep "FREQ value 59\.99" /tmp/MGC* |wc -l 459 # grep "FREQ value 60\.00" /tmp/MGC* |wc -l 385 # grep "FREQ value 60\.01" /tmp/MGC* |wc -l 302 # grep "FREQ value 60\.02" /tmp/MGC* |wc -l 144 # grep "FREQ value 60\.03" /tmp/MGC* |wc -l 68 # grep "FREQ value 60\.04" /tmp/MGC* |wc -l 3 # grep "FREQ value 60\.05" /tmp/MGC* |wc -l 0 > --- > Talk Mailing List > talk@gtalug.org > https://gtalug.org/mailman/listinfo/talk -- Michael Galea --- Talk Mailing List talk@gtalug.org https://gtalug.org/mailman/listinfo/talk
