On 30/04/13 22:26, John Rumm wrote:
On 30/04/2013 06:15, harry wrote:
On Apr 29, 11:46 pm, The Other Mike
wrote:
On Mon, 29 Apr 2013 14:24:18 +0000 (UTC),
(Andrew

Gabriel) wrote:
This is for EU-wide product supply.
UK had historically aimed to maintain +/-0.1Hz for no other reason
than CEGB had controls good enough to do so.
Much of the rest of the EU aims for +/-1Hz, and there may be some
EU synchronisation zones even outside that range.
The appliances will have to cope with the worst case.

There was someone on another group in the past few months, maybe
uk.railway? I
think the poster was possibly German, and they were claiming that on
the German
grid, the system frequency during the loss of 1.5 - 2GW of
generation (this
was a one trip, one site event) with a system loading of 50GW was
about 0.05Hz.

Yes you read that right zero point zero five hertz. So that's a
larger loss than
the Sizewell B Longannet incident of 2008 that resulted in a
frequency of around
48.8Hz. No, I didn't believe it either!

Not got any measurements in Germany but the frequency moves about in
Italy about
the same as the UK.

--

Frequency, load and efficiency are separate issues.

No, frequency and load are closely related....


yes, but they are still separate issues.


--
Ineptocracy

(in-ep-toc-ra-cy) €“ a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers.