[time-nuts] Timing Distribution in Mountainous Terrain
Poul-Henning Kamp
phk at phk.freebsd.dk
Sat Sep 11 19:45:53 UTC 2010
In message <8459B572-1428-4F6A-8375-AFB4F7225945 at 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
phk at 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.
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