michael taylor a écrit :
On Jan 31, 2008 5:27 PM, Sylvain RICHARD [1]<[EMAIL PROTECTED]> wrote:
Re the mains frequency, I believe it changes with the load on the grid.
Do you have a record of this?
I forget the reasoning for frequency variation, but it is load or
source related I believe. Part of the reason it
It is a balance between production and grid load. In the European case,
the grids are phase synchronous over several countries. The (oldish)
data I have is
- Nordel : Finland, Norway, Sweden, Denmark
- Uktsoa : UK.
- Atsoi : Irland
- Ucte : everybody else in Western Europe : Portugal, Spain, France,
Netherlands, Belgium, Luxembourg, Germany, Switzerland, Austria, Italy,
Czech Republic, Slovakia, Poland, Hungary, Romania, ex-Yougoslavia
During the 2006 blackout, the frequency went down by several hertz
before some customers were disconnected ("load shedding"). The so
familiar 50Hz line on VLF spectrograms took a dip.
A project for a easy to build AC frequency measuring device:
[2]<http://www.sparetimegizmos.com/Hardware/AC_Monitor.htm>
I could log the frequency deviations from my local AC mains if you
want some sample data.
This gadget looks nice, but I think I'll pass.
Good night
Sylvain
References
1. mailto:[EMAIL PROTECTED]
2. http://www.sparetimegizmos.com/Hardware/AC_Monitor.htm
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