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Re: 2 toroids

Subject:  Re: 2 toroids
  Date:   Fri, 18 Apr 1997 18:54:40 -0400 (EDT)
  From:   richard hull <rhull-at-richmond.infi-dot-net>
    To:   Tesla List <tesla-at-pupman-dot-com>


At 01:00 PM 4/18/97 -0500, you wrote:
>Subject:  2 toroids
>  Date:   Fri, 18 Apr 1997 12:38:20 -0400 (EDT)
>  From:   Esondrmn-at-aol-dot-com
>    To:   tesla-at-pupman-dot-com
>
>
>I was doing some experimenting last night with my small 3" coil.  I have
>been
>running one 12 kv 30 ma transformer and wanted to add another one in
>parallel.  Since the secondary is not very long, I was concerned about
>getting strikes down into the primary - and have been too busy to build
>a
>strike rail as of yet.  I mounted the smaller of two toroids (10") on
>the
>coil and then set an aluminum cylindner 6.4" dia x 6" high on top of it
>then
>placed the 12" toroid on top.
>
>The thought here was to get all the discharges to leave from the upper
>toroid
>and thus stay away from the primary.  I have this problem in spades with
>my
>larger 6" coil.  I contunually get white hot, thick bolts hitting the
>strike
>rail on this coil at 5kva and higher.  So, I thought I could apply what
>I
>learned here to the larger coil.
>
>When I fired the coil when set up as described above, most of the
>discharges
>left from the lower (smaller toroid) and tended to go mostly down.  This
>was
>a surprise.  Then I reversed the two toroids so the larger was on the
>bottom
>and smaller on top.  It worked now just as I had planned but required
>the
>larger toroid on the bottom.  I thought the theory was to have just
>enough
>lower toroid close to the coil to prevent corona and then go as large as
>possible on top.  This seems not to be the case.  Can anyone explain
>this?
>
>Ed Sonderman
>
>

Ed,

You probably had just a enough energy to leap off of the smaller radius
toroid.  The standoff cylinder for the larger toroid is a no-no.  If you
jam
the big toroid down on the smaller one, only the bigger toroid can send
out
spark as the smaller toroid is now electrostatically shielded.  You
might
not have to jam it into contact with the smaller toroid....  A smaller
elevation sleeve would be needed.  The object is to shield the bottom
toroid
with the larger until the point where spark can't break out.


Richard Hull, TCBOR