Re: [Fwd: 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>

Grounding both ends seems a recipe for ground loops.. On the other hand,
you're not really worried about ultimate EMI/EMC performance with a tesla
coil.  At least with both ends grounded, if one end comes loose, the shield
is still grounded.

Tesla list wrote:
> 
> Original poster: "Jim Mora by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jmora-at-jetlink-dot-net>
> 
> Hi All,
> 
> I have a pig on order and am trimming my trees:). I have corresponded
> with Jim Lux regarding rg-8u (not the foam junk(. I neglected to ask him
> about grounding the shield. Should it be grounded at the Fr ground  and
> striped back several inches at the control cabinet (house ground)?
> Connecting both ends of the ground seems like a no no to me. Your
> thoughts please.
> 
> Thanks to you all for all I have learned here,
> 
> Jim Mora, S Ca.
> 
> 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
> >
> >
> >