27-05-2017, 11:29 AM
(27-05-2017, 09:24 AM)Nick Wrote: I'm not entirely sure whether long term frequency stability is still guaranteed - it used to be the case that the generating authorities would correct any daily deviations during the night to keep any synchronous clocks relying on accurate long-term 50Hz for their accuracy correct.
Currently, the grid is running at 49.967Hz, which is pretty close to 50Hz and can be seen to move above and below 50Hz throughout the day at http://www.gridwatch.templar.co.uk/
In fact, while I've been typing this, it has gone up to 50.042Hz, so an average of 50.0045Hz between just those two readings.
Unfortunately, I don't have any old electric clocks to put the long term stability to the test.
