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Subject: Re: Best way to power array of LEDs?
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Date: Tue, 15 Oct 2002 23:08:37 GMT
NNTP-Posting-Date: Tue, 15 Oct 2002 19:08:37 EDT
Organization: Road Runner
"Lizard Blizzard" wrote in message
> daestrom wrote:
> > "Lizard Blizzard" wrote in message
> > news:email@example.com...
> > Reminds me of shipyard work in the Navy. When testing ship's service
> > turbine generators, we ran 3-phase cable up to the pier and bolted
> > each phase to a separate steel plate suspended above a large tank of
> > salt-water. To load the generators down fully and "run 'em in", the
> > three plates were slowly lowered into the saltwater while a fire pump
> > kept the tank full. Able to 'load' a 2000kw generator for four hours
> > to complete the tests this way.
> > daestrom
> I'm curious as to what was happening. Did the pump keep the tank full
> because it was boiling off steam, or was the excess water overflowed for
> cooling purposes?
It was a combination. The water would start boiling if we didn't run the
fire pump. But it was a simple 'overflow' setup where the excess simply
overflowed out a pipe and ran back into the river. Seem to remember it
smelled terrible and that is why it was topside on the pier. Might have
been a chlorine gas issue, don't remember though.
> Thinking about it, it's a shame you couldn't just run the power to the
> local grid. If it was 60 Hz, all you would have to do is synch up with
> the power, and feed the feeders. Or else disconnect the feeder and just
> supply the local AC loads.
Yeah would have been nice, but we weren't setup for any sort of metering so
only the shipyards electric bill would see any difference. But part of the
tests were to shift the load back and forth between SSTG's and control the
frequency etc... Couldn't really do all that with grid-tie.
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