Re: Primary Strikes
Tesla List wrote:
> >From Esondrmn-at-aol-dot-comWed Jun 19 21:33:27 1996
> Date: Wed, 19 Jun 1996 16:16:20 -0400
> From: Esondrmn-at-aol-dot-com
> To: tesla-at-pupman-dot-com
> Subject: Primary Strikes
> Richard Hull,
> I saw a recent post of yours about directing discharges from a toroid. I am
> having a problem with my 6" coil with strikes down into the primary. I use a
> 40" toroid and am running between 5 and 9 kva. Pushing it and probably
> overpowering this coil.
> I have a strike rail around the top of the primary. Previously, I have had
> to lay a coat hanger (or piece of wire) on the toroid, sticking out over the
> edge, in order to run the coil at all - at higher power levels. Without the
> wire, the strikes would hit the primary in the first few seconds and fire the
> safety gaps which would stay fired until I removed the power. A couple of
> months ago, I added a continuous ridge to the top outside edge of the toroid.
> I used 3/8" plastic tubing, taped in place and covered with aluminum foil
> tape. This had helped a great deal but I still cannot run more than maybe 10
> or 15 seconds before the primary gets hit and it all shuts down.
> My toroid is mounted about 10" above the last turn on the secondary. The
> resonant frequency is around 130 khz. Do you have any ideas on how to
> prevent this?
> Thanks, Ed Sonderman
The solution to no primary hits lay in getting rid of the primary! This
is no joke either. Only a magnifier system will ever perform to
"plus-ultra specs" A two coil system is doomed to the primary slapping
limitation. I don't know the actual spearation between the base of the
toroid and the primary winding. It should be about 4-5 feet! Nemesis,
our best and biggest two coil system (10-13 KVA), had to have a full
grounded ring around the primary of 5/8" copper pipe 1" above the outer
primary turn. It was hit all the time! The primary, itself, was
virtually never hit by the addition of this ring.
I am sorry about you primary hits, but there is a limit to the
performance of two coil systems. This limit is always related to the
required proximity of the primary to the output terminal.
Richard Hull, TCBOR