Re: Inter-turn arcing

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Shaun Epp by way of Terry Fritz <twftesla-at-qwest-dot-net>" <scepp-at-mts-dot-net>

I've experienced inter turn arcing only when my coil was way out of tune.
It arced between two inside turns of the copper tubing spaced 1/4" between
tubes.  It scared me abit when it happened too, but looked really cool.  Now
that my coil is better tuned, no arcing.

Shaun Epp


> >At 03:24 PM 7/21/2002 +0100, you wrote:
> >
> >Re: flat spiral or inverted-conical primaries- does the voltage on the
outer
> >turns present problems with inter-turn arcing -as it would appear the
> >volts/turn on the outer -i.e.. longer- turns would be greater than the
> >volts/turn on the inner -i.e.. shorter- turns
> >
> >due to increased inductive reactance and resistance in the added wire?
> >
> >In view of this might it be appropriate to space the outer turns further
> >apart than the inner turns, maybe even use a reversed parabolic type of
> >primary -with the wires becoming progressively more closely pitched
towards
> >the middle -by "reversed" I am thinking of a normal parabolic dish where
the
> >extremities of curve have been turned around so that they are now at the
> >centre to give the profile of a funnel- or trumpet- shaped cone.
> >
> >I have not so far encountered primary inter-turn arcing although I would
be
> >interested to know how common it is and what can be done about it for
future
> >reference -as well as any opinions on the advantages or otherwise of
wider
> >pitching of outer turns or funnel-shaped profiles to prevent inter-turn
> >arcing on Tesla coil primaries.
> >
>