Re: capacitance formula

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Crow Leader by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tesla-at-lists.symmetric-dot-net>


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, June 04, 2003 8:34 PM
Subject: Re: capacitance formula


[cut]

 > The voltage across each material will be inversely proportional to the
 > reciprocal of its dielectric constant.  Partially filling a space with
 > high deiectric constant material can lead to voltage breakdown which
 > wouldn't otherwise occur.
 >
 > Ed

This sounds backwards. Materials with a lower dielectric constant (assuming
same thicknesses) will develop a higher voltage when charged than higher k
materials mixed with them. Take for instance potting in HV stuff with air
bubbles or voids. They break down first, same issue with high voltage cable
with dielectric cores, the idea with them is to make sure there voids
between the strands of wire and insulation don't develop high voltages and
get destroyed from corona. Same with liquid filled capacitors. Air bubbles
will develop corona and eventually destroy the solid dielectric, not the
other way around.

KEN