[time-nuts] Timing Distribution in Mountainous Terrain
Bob Camp
lists at rtty.us
Sat Sep 11 21:08:23 UTC 2010
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" <phk at phk.freebsd.dk> wrote:
> 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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