Hi You also have load dependent harmonic energy on there that messes up the zero crossings at the micro second level.
Bob On Sep 11, 2010, at 3:45 PM, "Poul-Henning Kamp" <p...@phk.freebsd.dk> wrote: > In message <8459b572-1428-4f6a-8375-afb4f7225...@cox.net>, "Thomas A. Frank" > wr > ites: > >> If so, being within 300 miles of each other suggests that they are >> most likely all on the SAME section of the grid, in which case the >> phase time of arrival of the electric power waveform should be >> constant between them (the zero crossing may not be perfectly >> aligned, but it should always be the same differential). > > Won't work. Utility transformers have load-dependent parasitics > which mess this up. It is one of the biggest challenges in > doing "autonomous cell based grid control" and similar schemes. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > > _______________________________________________ > 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. > _______________________________________________ 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.
