[time-nuts] 60hz disciplined watch

[Christian Vogel]

Hi Poul-Henning,

On Wed, 20 Apr 2011 17:26:15 +0200, Poul-Henning Kamp <phk at phk.freebsd.dk>  
wrote:

> In message <BANLkTimuxPs8gBxP99ra8iJzvhEotp8ong at mail.gmail.com>, paul  
> swed writ es:
...
>> As for mains stability. They are indeed stable over time weeks and  
>> months
>> and are corrected.
...
> Here in europe that was lost in the "privatization" of the grid: Nobody
> was charged with paying for the extra power needed to capture lost
> cycles, so now they just try to keep it close to 50.0Hz and don't
> care about the integral.

where do you get that information? The ETSOE(transmission operators  
network)-handbook
which specifies the control-loops for frequency/phase have a section on  
TIME CONTROL.
They define different levels of allowed offsets between integrated network  
phase and UTC.

There are three bands with allowed deviations of +/- 20, 30 and 60 seconds
(target, tolerated and exceptional).

https://www.entsoe.eu/resources/publications/entso-e/operation-handbook/

--- QUOTE from Section P1, Page 29 ---
D. Time Control
[UCTE Operation Handbook Appendix 1 Chapter D: Time Control, 2004] {update  
under preparation}

Introduction
The objective of  TIME CONTROL is to monitor and limit discrepancies  
observed between
SYNCHRONOUS TIME and universal co-ordinated time (UTC) in the  SYNCHRONOUS  
AREA.
Reasonably it is applied during periods of uninterrupted interconnected  
operation, where the
SYNCHRONOUS TIME is the same in all control areas.
...
A discrepancy between SYNCHRONOUS TIME and  UTC is tolerated within a range
of ±20 seconds (without need for time control  actions).
---/QUOTE---

Greetings from Germany,

         Chris