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RE: coax (grounding shield & AC?)

Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>

Or, were you using any chokes or inductors in a transformer protection
circuit?  I saw some outrageous primary-side arcing when I tried using
air-core chokes in an L-C filter for my NST protection circuit.  If ever
there was evidence that chokes have no place in a protection circuit,
this was it.

Regards, Gary Lau

> 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