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>

What kind of coax were you using?  Cable TV coax is worthless (foam
dielectric)... RG-213 or RG-8 (nominal .405" OD) shouldn't have any problem.
And, if the shield is grounded (as it should be in this application),
there's no way you should feel anything. If you do, there's something else
wrong.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, January 27, 2002 12:29 PM
Subject: RE: Ideas for HV Wiring.


> Original poster: "Neil Richardson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <neil-at-opticalrealities-dot-com>
>
> Coaxiel is good for 20-30kV? Thats what I thought till I grabbed the
cables
> from my flyback in one hand, I could feel a buzzing thru the cables, thats
> when I thought of the oil insulation idea. I might god out and get the
stuff
> to make some HV cabling, I wanna be as safe as I can be. There is some
> silicone in the kitchen cupboard which I can use to seal the cables. I'll
> prolly have to have bolts at either end so I dont have to make new wires
> each time the this wire inside snaps.
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: 27 January 2002 18:33
> To: tesla-at-pupman-dot-com
> Subject: Re: Ideas for HV Wiring.
>
>
> 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
> >
> >
> >
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