On 6/25/2011 7:11 AM, email@example.com wrote:
You have to copy and paste the whole link to your web browser because
the bottom line wasn't automatically highlighted as a link. It happens
all the time with some news readers. That's why I use the address
shortening site "http://tinyurl.com /" whenever I want to post a very
long address. :-)
Your link came out fine but I think I've seen that fail too depending on
the software being used or the number of copies of the original message
breaking the link. That's why I always choose to shorten the URL so it
doesn't break after it's forwarded several times. Perhaps I'm too
neurotic about it.
Consider the government dufas who is in charge:
"Tweaking the power grids 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 asked.
"Lets see if anyone complains if we eliminate it." "
I guess he doesn't know about how clocks with synchronous motors operate.
I guess he is trying to top Obamas technically incompetent FCC chairman
who gave permission (after his boss got a big donation) to proceed with
a system that interferes with GPS?
So, you're saying that an electrical engineer isn't influenced by the
that affects non electrical engineers?
Don't forget that about half the electrical engineers perform below
Uhem! "Dufas" is a proper family name, I hope you mean "doofus" which
describes a complete dolt. As far as I know none of the Dufas family is
in charge of the national power grid. ^_^
A long time ago I was working at company that was running a lot of
equipment that was using the frequency of 60 Hz power line to control some
I got the task of getting the specs of the frequency tolerance. It took a
few phone calls to get to the engineering offices of Boston Edison. The
engineer I reached told me the allowable frequency deviation and reminded me
of something I had learned years before. If alternators running in parallel
are not in phase,one tries to act as if it were a motor and the system could
lock up, We had done this experiment in an AC power lab coupling a pair of
alternators that were being driven by DC motors so that their speeds could
be adjusted and they could be brought into phase with each other. Students
who tried to put them in parallel when they were not close enough got to
produce a pretty loud squeal from the complaining equipment.
As the electric company engineer and I talked he pointed out that the Great
Northeast Blackout in 1964 was not simply that some parts of the grid had
been overloaded but that a surge/spike/anomaly had created a phase mismatch
which snowballed along as some units fell out of the allowable frequency and
knocked alternators of the grid. The short term fix was to get off the grid
and come back on when the frequency mismatches had been resolved.
At any rate, I can hardly wait to see what happens,
When you have a phase mismatch,you get partial wave cancellations and
additions (and standing waves)between the different out-of-phase
sources,resulting in power losses,and for the gigawatts electrical
grid,that is meaningful.
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