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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by Dave Martindale on April 11, 2008, 5:20 pm
>That's been my experience in power plants, paper mills and coal
>mines/prep plants as well.
>There are some generating plants built in the early 50s w/ much of the
>original electrical controls, switchgear, etc., ...
There's a hydroelectric powerhouse near hear that was built in 1912 and
remained in use until the late 1990's. Then a new powerhouse with more
efficient turbines came online, and the old powerhouse was turned into a
museum. All the original switchgear still seems to be there, though it
was adapted for remote monitoring and control at some point.
There are a few photos here:
http://www.bchydro.com/recreation/mainland/mainland5361.html
It was built in a time when there was no power grid in the area, so it
was designed to be able to start "cold", with no outside source of
electricity. A bank of lead-acid batteries provided initial power,
probably for instruments and DC generator field. There are a pair of DC
generators, driven by tiny turbines, to provide DC armature power to the
main alternators. Output voltage control seems to have been done with
*large* carbon rheostats in the DC supply to each alternator.
The washrooms look like they are 1912 vintage, too...
Dave
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Posted by David Nebenzahl on April 8, 2008, 8:15 pm
On 4/8/2008 7:39 AM hallerb@aol.com spake thus:
> breakers trip from heat, my theory is contacts degrade a little, heat
> and make things more sensitive.
Ah, so it's another hallerb "theory". We can safely ignore it in that case.
--
The best argument against democracy is a five-minute
conversation with the average voter.
- Attributed to Winston Churchill
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Posted by hallerb@aol.com on April 8, 2008, 8:57 pm
> On 4/8/2008 7:39 AM hall...@aol.com spake thus:
>
> > breakers trip from heat, my theory is contacts degrade a little, heat
> > and make things more sensitive.
>
> Ah, so it's another hallerb "theory". We can safely ignore it in that case=
.
>
> --
> The best argument against democracy is a five-minute
> conversation with the average voter.
>
> - Attributed to Winston Churchill
no i report what westinghouse breaker design engineers told me........
they would change with age so they were made more sensitive to trip on
less current than designed........
this was better than starting a fire..
i happened to be there one day when they were testing knock off
westinghouse breakers, made in mexico. looked just like the ones they
produced from the outside.
when taken to 120% of rated current they exploded, a real fireball.
these breakers were high voltage distribution ones
so has anyone found a breaker that wouldnt trip other than FPE stab
lock??
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Posted by dpb on April 8, 2008, 9:07 pm
hallerb@aol.com wrote:
...
> no i report what westinghouse breaker design engineers told me........
...
You'll excuse me if I wait to hear from the Circle-W engineers directly
what they _actually_ said and see their design criteria...
--
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Posted by RBM on April 8, 2008, 9:21 pm
> On 4/8/2008 7:39 AM hall...@aol.com spake thus:
>
> > breakers trip from heat, my theory is contacts degrade a little, heat
> > and make things more sensitive.
>
> Ah, so it's another hallerb "theory". We can safely ignore it in that
> case.
>
> --
> The best argument against democracy is a five-minute
> conversation with the average voter.
>
> - Attributed to Winston Churchill
no i report what westinghouse breaker design engineers told me........
they would change with age so they were made more sensitive to trip on
less current than designed........
this was better than starting a fire..
i happened to be there one day when they were testing knock off
westinghouse breakers, made in mexico. looked just like the ones they
produced from the outside.
when taken to 120% of rated current they exploded, a real fireball.
these breakers were high voltage distribution ones
so has anyone found a breaker that wouldnt trip other than FPE stab
lock??
I've seen breakers of all manufacturers fail. You think Federal is the only
brand that's had that problem. Try Frank Adams or Zinsco. Personally I think
the only difference is that Federal sold more product
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