Re: Ideas for HV Wiring.

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

The coax itself is actually good for 20-30 kV without too much trouble (and,
if you are running a grounded center transformer like a NST, the voltage to
ground is halved (why they do it)).

Oil works great, except: 1) It leaks; 2) It gets wet and contaminated,
greatly reducing its dielectric strength.

However, it is a good idea, because it does help reduce the corona, and is
what they do on some HV power transmission cables, where they pump the oil
in under pressure (also it provides cooling on an underground cable).

Bear in mind that the field concentrations due to different dielectric
constant occur even with oil, unless you happen to match the epsilon of the
dielectric with that of the oil.  Granted, it's not as bad as air, where
you've got a 1:2.5 kind of ratio (or 1:5 if you're using castor oil), but
even the 2:2.5 kinds of ratio can cause problems if you're pushing it.
Small water droplets, dust, or gas bubbles in oil also cause problems.
(paper and fabric fibers are notorious for this...they're long and skinny,
and line up with the field pointing the high stress points (ends) at the
worst direction).

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, January 26, 2002 5:25 PM
Subject: Ideas for HV Wiring.


> Original poster: "Neil Richardson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <neil-at-opticalrealities-dot-com>
>
> I noticed a post about corona => ozone => blah blah blah?
> If you can't find any HV wire anywhere (like me) why dont you simple use
> coaxiel wiring, use the centre wire, feed that through some hose pipe, and
> fill the hose pipe with oil. That will supress the corona, and possibly
make
> it safe to handle the cables even when energised.
>
> Just a little idea
>
>
>