Re: Grand Apagon - Electricity (not) in Spain

Am 30.04.25 um 12:41 schrieb Carlos E.R.:

On 2025-04-30 11:59, Liz Tuddenham wrote:

Bill Sloman <bill.sloman@ieee.org> wrote:

 

The grid frequency begins to fall so energy from the moving parts is
converted to electrical power which is fed into the grid to increase.
the frequency.  This results in a loss of stored mechanical energy which
causes the turbine to begin slowing down - which is detected by the
control system and used to feed more water/gas/steam into the turbine so
its speed is returned to normal.

>
I understand that the turbine doesn't actually slow down, because the generator starts working as a synchronous motor drawing energy from the network instead; this is detected by the control system and feeds more water/gas/steam, etc.
>
As long as the network keeps the frequency.

 Actually, the grid frequency is a bit elastic.
We had that in the European grid some years ago, when
some Balkanese enclaves / exclaves did not care much
about cos_phi correction and the grid drifted slooowly
to a lower frequency. No bad consequences other than some
wall clocks were a few minutes late after a week or two.

I found that easy to measure with a time interval counter.
(ps resolution in a second elapsed time)
 < https://www.flickr.com/photos/137684711@N07/38870750440/in/datetaken/ lightbox/     >
 Cheers, Gerhard