RE: Stats of my new capacitor

To: tesla-at-pupman-dot-com
Subject: RE: Stats of my new capacitor
From: Sulaiman Abdullah <sulaiman-at-lityan-dot-com.my> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Wed, 14 Oct 1998 04:40:39 -0600
Approved: terryf-at-verinet-dot-com

Aric, assuming that your vacuum tank is 10" x 14" = 140 sq.in. the
pressure on the side wall will be approx. 2000 pounds! (1 Atm. = 15
p.s.i.)
I'm pretty sure the 3/8" Lexan will not withstand this.

Also consider the stress on the 1/4" Lexan when the capacitor swells due
to absorption of oil, don't make the nylon ties too tight.

Also I'd consider increasing the guard region at the 'ends' of the
capacitors (where you make the connections) to 2" and reducing the guard
region at the edges to 1" .

my two cents worth ... Sulaiman

> > Original Poster: Aric_C_Rothman-at-email.whirlpool-dot-com (Aric C Rothman)
> 
> > 
> >      I just finished taking readings of a new stack plate capacitor
> I 
> >      built.  I used a Quadtech precision LCR meter to take these 
> >      measurements.
> >      
> >      C = 42.5 nF
> >      DF = 0.0000759
> >      ESR = 818.73 microohms
> >      
> >      all measurements were taken at 100 kHz.
> >      
> >      The capacitor is made of styrene and Al foil (Reynolds Wrap
> Heavy 
> >      Duty).  There is  a 1 1/2" guard region around each foil.  The
> styrene 
> >      layers are 9"x13" and consist of two 20 mil sheets between each
> foil.  
> >      The stack is sandwiched between 1/4" sheets of lexan and tied
> together 
> >      with nylon straps.
> >      
> >      I'm constructing a vacuum tank of 3/8" Lexan.  I will immerse
> this cap 
> >      (and its soon to be born siblings :) in this tank, one at a
> time, 
> >      under oil.  After degassing under vacuum, the caps will be
> transferred 
> >      to a epoxy coated wooden box, which will be filled with oil.
> >      
> >      Has anyone had success/problems constructing a vacuum chamber
> out of 
> >      solvent welded pieces of polycarbonate/acrylic/etc.  Also, what
> kinds 
> >      of terminals have capacitor builder here used in their homemade
> units?
> >      
> >      Aric
> 
>