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Posted by Ken on April 6, 2009, 8:28 pm
On Sun, 05 Apr 2009 23:25:09 +0100, Eeyore



as yet,


work. You're

No.  I know the real life.

Posted by Neon John on April 6, 2009, 12:03 am
On Mon, 06 Apr 2009 00:21:20 +0100, Tim Jackson

Why do you keep posting about England, a place barely the size of a
large state here, in what is mostly a US newsgroup.  It is irrelevant
to what happens here.

For reasons that you should understand having to do with wide area
network stability, the frequency here is dead on within a fraction of
a cycle all the time.  The nuclear power plant where I "grew up"
(first 10 years of my career) had a large frequency recorder with a 12
inch wide chart.  60 hz was in the center of the chart and the
deviation on either side was 0.5 hz.  I never saw the pen move more
than a few pen widths off 60 hz.

Another data point.  I have a Dranetz power quality monitor connected
to my service that runs continuously.  I have the frequency alarm set
to alert at 1 tenth of a cycle variance from 60.00 hz.  It has never
alarmed in over 10 years of constant operation.

In order to deviate from 60.00 cycles, a utility would have to isolate
itself from the grid (or else be lucky enough to have an HVDC feed).
That has happened in the past in NY and CA but I doubt that it would
now, what with the new FERC reliability rules in effect and the
ability to wheel power hither and yon.

If it is acceptable for the British power industry to drop a whole
cycle then frankly, someone needs to be shot!  And a few more nuclear
power plants built.


Posted by Eeyore on April 6, 2009, 2:17 am

Neon John wrote:

Britain ( not England ) is also tied to the European grid which is every bit
as large as your own.

It doesn't happen. Anyone who thinks it's 49-51 Hz is an IDIOT. As you say,
it would cause disastrous consequences to the interlinking of various
generation plants.


Posted by Ken on April 6, 2009, 8:39 pm
 On Mon, 06 Apr 2009 03:17:26 +0100, Eeyore

We don't think, we know.
Check it out in practice and you will see.
Now in the night at 22:31 I have 50.10 Hz here in Sweden.

Posted by Eeyore on April 7, 2009, 2:04 am

Ken wrote:

But NOT 51 Hz.


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