[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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