[RE-wrenches] National grid hertz adjustment

[Drake]

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?




At 01:44 PM 6/26/2011, you wrote:
>I saw this as well, came over the AP news wire on Friday, June 24th.
>I've been trying to figure out what they hope to gain by allowing more
>frequency variation.....puzzling at best!
>
>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
>
><http://www.four-winds-energy.com>www.four-winds-energy.com
>
>Although no trees were killed in the sending of this message,
>a large number of electrons were terribly inconvenienced.
>
>
>
>On 6/26/2011 1:31 PM, North Texas Renewable Energy Inc wrote:
>>
>>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?
>>
>>Jim Duncan
>>
>>By Seth Borenstein The Associated Press
>>
>>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.
>>
>>"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.
>>
>>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.
>>
>>Power companies now take steps to correct it, 
>>keeping the frequency of the current as precise as possible.
>>
>>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.
>>
>>The test is tentatively set to start in mid-July.
>>
>>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.
>>
>>"Is anyone using the grid to keep track of 
>>time?" McClelland said. "Let's see if anyone complains if we eliminate it."
>>
>>No one is quite sure what will be affected. 
>>This won't change the clocks in cellphones, GPS or even on computers.
>>
>>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.
>>
>>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.
>>
>>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.
>>
>>Read more: 
>><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
>>
>>
>>
>>
>>
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Drake Chamberlin
ATHENS ELECTRIC
OH License 44810
CO license 3773
NABCEP Certified PV
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