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It would be good to know how much variation. Is it going to shut
down our inverters? What about UL 1741? Can we adjust the
tolerance? <br><br>
<br><br>
<br>
At 01:44 PM 6/26/2011, you wrote:<br>
<blockquote type=cite class=cite cite="">I saw this as well, came over
the AP news wire on Friday, June 24th.<br>
I've been trying to figure out what they hope to gain by allowing
more<br>
frequency variation.....puzzling at best!<br><br>
<pre>Roy Butler
NABCEP Certified Solar PV Installer®
NYSERDA eligible PV & wind installer
Four Winds Renewable Energy, LLC
8902 Route 46
Arkport, NY 14807
607-324-9747
<a href="http://www.four-winds-energy.com">www.four-winds-energy.com</a>
Although no trees were killed in the sending of this message,
a large number of electrons were terribly inconvenienced.
</pre><font face="Courier New, Courier"></font><br>
On 6/26/2011 1:31 PM, North Texas Renewable Energy Inc wrote: <br>
<blockquote type=cite class=cite cite=""><br>
This article in the local paper sounds a little like potential trouble
for grid connected inverters. I looked around on the NERC www site
without finding the report mentioned. Any other wrenches seen anything
about this experiment?<br><br>
Jim Duncan<br><br>
By Seth Borenstein The Associated Press<br>
<dl><br>
<dd>WASHINGTON -- A yearlong experiment with the nation's electric grid
could mess up traffic lights, security systems and some computers -- and
make plug-in clocks and appliances like programmable coffee makers run up
to 20 minutes fast.<br><br>
<dd>"A lot of people are going to have things break, and they're not
going to know why," said Demetrios Matsakis, head of the time
service department at the U.S. Naval Observatory, one of two official
timekeeping agencies in the federal government.<br><br>
<dd>Since 1930, electric clocks have kept time based on the rate of the
electrical current that powers them. If the current slips off its usual
rate, clocks run a little fast or slow.<br><br>
<dd>Power companies now take steps to correct it, keeping the frequency
of the current as precise as possible.<br><br>
<dd>The North American Electric Reliability Corp., which oversees the
U.S. power grid, is proposing an experiment that would allow more
frequency variation without corrections, according to a June 14 company
presentation obtained by The Associated Press.<br><br>
<dd>The test is tentatively set to start in mid-July.<br><br>
<dd>Tweaking the power grid's frequency is expensive and takes a lot of
effort, said Joe McClelland, head of electric reliability for the Federal
Energy Regulatory Commission.<br><br>
<dd>"Is anyone using the grid to keep track of time?"
McClelland said. "Let's see if anyone complains if we eliminate
it."<br><br>
<dd>No one is quite sure what will be affected. This won't change the
clocks in cellphones, GPS or even on computers.<br><br>
<dd>But wall clocks and those on ovens and coffee makers -- anything that
flashes "12:00" when it loses power -- may be a bit off every
second, and that error can grow with time.<br><br>
<dd>VCRs or DVRs that get their time from cable systems or the Internet
probably won't be affected, but those with clocks tied to the electric
current will be off a bit, Matsakis said.<br><br>
<dd>According to the June presentation, East Coast clocks may run up to
20 minutes fast over a year, but West Coast clocks are only likely to be
off by eight minutes. In Texas, it's only an expected speedup of two
minutes. <br><br>
<dd>Read more:
<a href="http://www.star-telegram.com/2011/06/24/3178359/test-of-electric-grid-could-be.html#ixzz1QOzHwezw">
http://www.star-telegram.com/2011/06/24/3178359/test-of-electric-grid-could-be.html#ixzz1QOzHwezw</a>
<br>
<dd> <br><br>
</dl><br>
<pre>
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