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opened pulse cap


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From:  Barton B. Anderson [SMTP:mopar-at-mn.uswest-dot-net]
Sent:  Friday, March 20, 1998 3:57 AM
To:  Tesla List
Subject:  Re: opened pulse cap



Tesla List wrote:

> ----------
> From:  Bert Hickman [SMTP:bert.hickman-at-aquila-dot-com]
> Sent:  Friday, March 20, 1998 6:23 AM
> To:  Tesla List
> Subject:  Re: FW: opened pulse cap
>
> Tesla List wrote:
> >Jim,
>
> Very interesting post, Jim! I have a similar cap that is 54 uF at 15 kV
> that I tore apart (to the module level) after it catastophically failed
> a while back. It had 28 identical flattenned modules all connected in
> parallel. I suspect my cap may have been used more for Power Factor
> Correction than for pulse duty. From the outside, these modules look
> like single rolls, and the cap's construction seemed to violate the
> "rule of thumb" about having many caps in series to obtain voltage
> standoff capability. Your autopsy shows how this might be done!
>
> On my cap, the conductive strips appeared to be tin or tinned copper,
> and were also heavily soldered to the aluminum endfoil. Don't know if
> the solder formulation is special (i.e., low melting indium alloy?). The
> dielectric was a combination of polypropylene and kraft paper. I was
> going to unwind one of these modules when I got a bit of time - I'll
> definately do so now...
>
> -- Bert --

Bert, I wonder if the cap you have is possibly a high voltage flashlamp application?

Maybe too high voltage if this single cap were used?

I have about 30, 100uF caps in the garage configured identically to yours in every
detail.
I tore a couple apart as well as unrolled one or two. Beautiful rollup job these
professional machines do. (Actually, the operators of these machines are very
skilled). Too bad about the capacitance ratings, isn't it. The company I work uses
my caps for flashlamp applications, however, although the caps are 100uF, they are
series'd 4 caps per lamp. I was just thinking the cap you have may have been
designed for a similar application.
|_Bart_|