Re: Coax Cables for High Voltage Transmission (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 17 Nov 2004 11:06:01 -0600
From: Dr. Resonance <resonance@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Coax Cables for High Voltage Transmission (fwd)


Polyethylene or polypropylene works better as it has less creepage and
leakage current factors than pvc.

We drill out the entire interior part of a SO-239 chassis connector.  They
we epoxy a 5 inch long PE tube into the SO-239 connector.  At the end of the
tube we epoxy in a small bananna receptacle.

This allows a nice fit to standard RG-8 cable as a DC HV connector.  The
shield is soldered to the PL-259 plus while the center part is stripped of
the braided shield as it extends into the PE tube with a bananna tip solder
to the coax cable tip.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913

>
> John, thanks for sharing your info on the hv connectors!  That design may
be
> just what I have been looking for.  I hope you don't mind if I ask you a
> couple of questions:
>
> What diameter and lenth of pvc pipe did you use and does it tightly fit
the
> polyethylene jacket of the cable?
>
> I see you used sheet pvc for the ends of the insulators.  Could pvc end
caps
> have been used instead?
>
> Any other info you want to share would be appreciated.  I have a +/-45 KV
> metal housed x-ray transformer sitting here for which I would like to
access
> the high voltage for hobby and other uses.  Right now, it's sealed inside
> the case and I have been thinking of making recessed terminals and
> connectors so I can have high voltage access.  The insulated pve recesses
> would be mounted through holes drilled through the metal chassis.
> Connectors/ insulators similar to yours may in fact do the trick.  This
> route may be the cheapest method (which is what I seek) and the other
> alternative is to remove the transformer and rehouse it in a new
container.
> Didn't have much with that option until lately when I found some pvc
"boxes"
> that would work, although they are expensive.
>
> Thanks,
> Jack
>
> ----- Original Message -----
> From: "High Voltage list" <hvlist@xxxxxxxxxx>
> To: "hvlist" <hvlist@xxxxxxxxxxxxxxxxx>
> Sent: Tuesday, November 16, 2004 2:20 PM
> Subject: Coax Cables for High Voltage Transmission (fwd)
>
>
> > Original poster: <sroys@xxxxxxxxxxxxxxxxx>
> >
> >
> >
> > ---------- Forwarded message ----------
> > Date: Mon, 15 Nov 2004 13:37:39 -0700
> > From: John Doran <johnd@xxxxxxxxxxxxxxx>
> > To: hvlist@xxxxxxxxxx
> > Subject: Coax Cables for High Voltage Transmission
> >
> > Howdy!
> >
> >
> >
> > I use polyethylene-insulated RG-8 cable extensively for high-voltage
> >
> > use in my laboratory, at potentials up to 20 kV, and I have never had a
> >
> > problem with it.
> >
> >
> >
> > Spellman High Voltage uses it for potentials of only up to 8kV in their
> >
> > products,
> >
> >
> >
> > www.spellmanhv.com/tech/appnotes/AN-07.doc
> >
> >
> >
> > but I have a Del Electronics 40kV power supply "brick" that employs RG-8
> >
> > cable for its output connection.
> >
> >
> >
> > I have devised a simple HV connector for use with coaxial cable, and
> > which
> >
> > may be modified for just about any potential.  I have posted details on
> > my
> >
> > Web site-take a look at
> >
> >
> >
> >             http://timefracture.org/reg.html
> >
> >
> >
> > for more information and some photographs.  Please stay safe!
> >
> >
> >
> > -John
> >
> >
> >
> >
> >
>
>
>