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Re: the mechanical engineering problem
Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>
We don't buy much raw bus bar. Everything we have is
in Siemens, Cutler Hammer, Square D, etc. low or
medium voltage switchgear. We typically have
contractors purchase and install the switchgear. They
usually purchase it from local distributors.
I've personally purchased 3" x 1/4" silver plated bus
bar stock from McMaster Carr, but I'm sure you can
find a cheaper place if you shop around.
Adam
--- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: "resonance"
> <resonance@xxxxxxxxxxxx>
>
>
>
>
> Can you get me the name of the company that your
> group buys buss bar
> from? I need to get about 120 ft of 5 inch wide x
> 1/4 inch copper
> buss bar ribbon.
>
> Dr. Resonance
>
>
> ----- Original Message ----- From: "Tesla list"
> <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Friday, January 12, 2007 12:07 PM
> Subject: Re: the mechanical engineering problem
>
>
> >Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>
> >
> >Using silverplated bus bar is fairly standard
> >practice. It has nothing to do with skin effect. We
> >literally have miles of the stuff, in 4" x 1/4" up
> to
> >three sets of 6" x 1/4" for 3,000 amp service. The
> >silver plating is to allow getting a solid
> connection
> >when splicing, or landing large conductors. Even
> with
> >silver plating, corrosion can be a problem, but
> copper
> >oxidizes so much easier there's no comparison. All
> of
> >our low and medium voltage bus bars are 60 Hz, so
> >there's essentially no skin effect in play.
> >
> >Adam
> >
> >--- Tesla list <tesla@xxxxxxxxxx> wrote:
> >
> > > Original poster: Mike <megavolts61@xxxxxxxxx>
> > >
> > > Hi DC,
> > > I'd be happy to silver plate your primary,
> as I
> > > am well versed
> > > in that. I used to work in a research lab doing
> all
> > > kinds of
> > > electrochemisty, including once even fixing an
> > > induction furnace
> > > who's silver plating had tarnished away over the
> > > years and quit
> > > working. I put a better plating on the parts
> than
> > > the original
> > > manufacturer did. That's beside the point.
> > > I deleted the earlier emails on this thread
> but
> > > seem to remember
> > > you planned to run this monster at about 20kHz.
> > > Let me point out a
> > > lil something I thought about. From the
> > > information I have, The
> > > skin depth (based on copper, but probably close)
> at
> > > 10 kHz is 0.66
> > > mm. So for fun, I did a lil caclulation based
> on
> > > an assumption
> > > that the skin depth for silver at 20kHz is about
> 0.5
> > > mm. I know I
> > > should be more precise, but I'm lazy tonight.
> > > First of all your perimeter of the bus
> bar is
> > > (5 + 1/4 + 5 +
> > > 1/4) * 2.54 cm/ in. or 26.67 cm. Then, 1 ft
> > > length is 12 *
> > > 2.54 or 30.48 cm, giving you an area of 812.9
> sq.
> > > cm. per foot of
> > > bus bar. Now multiply that by 0.5 mm (or
> 0.05cm),
> > > you get 40.645
> > > cu. cm per foot if you wish to have ALL silver
> > > conducting. At a
> > > diameter of 26 ft, this leads you to need
> > > pi*26*40.645 cu. cm of
> > > silver. Multiply that by the density of
> 10.5g/cu.
> > > cm and divide by
> > > 31.1 grams/troy oz. This shows you will need
> over
> > > 1100 troy oz of
> > > silver just for that first turn. I think you
> > > might gain about 5%
> > > better conductance for your $$. This was just
> an
> > > estimate....but you see where I'm coming
> > > from....might be a lot
> > > cheaper to go to six inch bus bar. It also
> > > depends on how thick
> > > you want the silver plating to be. I honestly
> > > can't say at this
> > > moment if there's really anything to be gained
> by
> > > plating the bus bars.
> > > Mike
> > >
> > >
> > >
> > >
> > > Original poster: Yurtle Turtle
> <yurtle_t@xxxxxxxxx>
> > >
> > > You may know this already, but when you go to
> silver
> > > plate the bus bars, you can do it in your shop
> for a
> > > fraction of the cost of having it electroplated,
> by
> > > using Cold Amp. It's a powder and real easy to
> use.
> > > We've used it in medium voltage (12,470)
> switchgear.
> > >
> > > Adam
> > >
> > > --- Tesla list <tesla@xxxxxxxxxx> wrote:
> > >
> > > > Original poster: "D.C. Cox"
> > > <resonance@xxxxxxxxxxxx>
> > > >
> > > >
> > > >
> > > >
> > > > Thanks to everyone who submitted ideas for
> the
> > > big
> > > > primary coil. I
> > > > have several ideas now and will resolve the
> > > issues
> > > > soon.
> > > >
> > > > Several members suggested internal primary,
> but
> > > if
> > > > there are any
> > > > flashovers they would not be visible unless
> fiber
> > > > optics were
> > > > employed to watch for them.
> > > >
> > > > The idea I think we will employ (actually
> > > suggested
> > > > by several
> > > > members) is to use 5 inch wide x 1/4 inch
> copper
> > > > ribbon buss bar and
> > > > then silver plate it.
> > >
> > >
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> > >
> >
> >
> >
> >
>
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