Quote:
Originally Posted by davidw87
I've checked up to Jan '18 so far and the grid time error was as follows at these points:
mid-Sep '16: -67 seconds
mid-Dec '16: -76s
mid-Mar '17: -133s
mid-Jun '17: -205s
mid-Sep '17: -256s
mid-Dec '17: -224s
|
I've now completed the checking up to 20 Nov:
mid-Mar '18: -430 seconds
mid-Jun '18: -480s
20 Nov '18: -436s
The substantial slow down between Dec '17 and Mar '18 reflects what posters said here about a slow down in early 2018! It means
SEVEN minutes has been lost since 2016 and hasn't been made up.
The table below shows an extract of what I've done. There should be 1,000,000 seconds between each of the dates below. The column on the right shows how many seconds passed based on grid frequency.
This assumes 50.00Hz for 1 second = 1 second, so 49.9Hz for 1 second = 0.998 seconds.
Is my calculating correct?
2018-01-16 07:06:38 +0000 1000012.535
2018-01-27 20:53:18 +0000 999933.8653
2018-02-08 10:39:57 +0000 999952.185
2018-02-20 00:26:37 +0000 999973.1144
2018-03-03 14:13:16 +0000 999983.2907
2018-03-15 03:59:56 +0000 999998.2501
2018-03-26 18:46:36 +0100 999983.658
2018-04-07 08:33:15 +0100 999993.9784
2018-04-18 22:19:55 +0100 999991.3088
2018-04-30 12:06:35 +0100 1000018.474
2018-05-12 01:53:14 +0100 999966.2587
2018-05-23 15:39:54 +0100 1000003.64