[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
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Never attribute to malice what can adequately be explained by incompetence.




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