Re: HV xray cable revisited

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Gerry,

This is exactly what I was meaning to say in response
to this issue, but couldn't quite figure out how to put it
into script (at least intelligably). Your "thinking out loud"
explained it well ;^)

David Rieben


----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, January 06, 2006 11:08 AM
Subject: Re: HV xray cable revisited


> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> Hi Bart and Mike,
> Thinking out loud here.  If the arcing is between the center 
> conductor and the black outer shield, then there is a problem that 
> needs to be fixed.  If the arcing is between the outer shield 
> (ungrounded) and a grounded object, I would think this would be 
> expected due to the capacitance between the inner conductor and the 
> outer shield.  The outer shield has no way to get rid of induced 
> charge and would certainly arc to something grounded.  If the outer 
> shield was grounded, I would think this discharge would cease.
> Gerry R.
>
> > Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
> >
> > Hi Mike,
> >
> > As I understand it, the coating arcs not at the ends, but when the 
> > black coating comes in contact to a grounded object (or the ground 
> > itself). I suspect the cable is not sufficient for AC applications 
> > at the voltage your running. Check around and you'll see DC ratings 
> > on high voltage cable. AC and pulsed DC specs are much lower, so I 
> > wonder if the cable is not sufficient for the application. But, we 
> > can only make our best guess. As the cable is in your hands, 
> > possibly you could find out it's DC and AC ratings.
> >
> > Take care,
> > Bart