Re: Ground current experiments

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

Original poster: "Paul Nicholson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <paul-at-abelian.demon.co.uk>

Chris Swinson wrote:

> IS there any graphs or anything to show the phase difference between
> the top and bottom of the coil in relation to voltage ?

No, the fine details of the phase relation between current and voltage
in the TC are a bit messy.  In an isolated secondary which is ringing
by itself, with no external coupling, the voltages and currents are
90 degrees apart, and all the voltages along the coil are in phase
with one another, ditto the currents.  This is not so for a coil that
is coupled to something else, eg via a primary, or a base drive. Then
the nice neat uniform phase is messed up by the drive and you get 
something less than 90 degrees.  The details depend on just how the
drive is applied.  Any particular configuration can be modeled in 
detail if you needed to know.
 
> I know someone did a rough idea to this but I wonder if there is
> anything more accurate to show somethign like current and voltage
> turn per turn and of course the phase difference as the turns go
> up the coil.

See
 http://www.abelian.demon.co.uk/tssp/pn1710/
for graphs of some normal and some unusual voltage and current
profiles.

And
 http://www.abelian.demon.co.uk/tssp/pn2511.html 
describes how the voltages and currents are calculated.

Write offlist if you want CSV data for a closer look at the phase
relationships.

> I would assume when the voltage gets into a few thousand volts ,
> maybe a few inches from the bottom the current will be minute...

The current reaches a peak a little above the base of the coil, and
then falls above that.
--
Paul Nicholson
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