Re: coax (grounding shield & AC?)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "resonance" <resonance@xxxxxxxxxxxx>


It was a two bushing with one bushing grounded.  This was also way 
back in the late 60s when I ran the xfmr output to the cap and not 
the spark gap. Pri cap was .06 uF and I think this helped create the 
resonance that produced the wild effects I witnessed.  There was no 
resistors in the circuit at this time and no safety gap either.

Dr. Resonance
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, May 05, 2007 8:57 PM
Subject: Re: coax (grounding shield & AC?)


> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> Hi Dr R,
>
> This sounds more than just a single transmission line 
> reflection.  I'm wondering if you had any series resistance between 
> the coax and the main spark gap.  If not, maybe a high frequency 
> resonance was created by the coax length by having a virtual open at 
> the PIG end and a virtual short at the spark gap end.  Was this a 
> one or two bushing PIG  do you remember??
>
> Gerry R
>
>
> > Original poster: "resonance" <resonance@xxxxxxxxxxxx>
> >
> > It's covered intensively in Dollanger & Sargents "Power 
> > Electronics". They even have a special section on "coaxial high 
> > potential generators" which use this principal to generate very 
> > high potentials.  2E, 3E, and 4E are possible.  In my mishap, it 
> > was firing almost 14 inches across a 14.4 kV pole xmfr bushing to 
> > the grounded case.  It had to be in excess of the 125 kV BIL rating 
> > of the insulator.
> >
> > Dr. Resonance