Re: Can anyone explain this???

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

Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>

Hi Tyler,

Be sure to use safety gaps too!  I have a filter design at:

http://hot-streamer-dot-com/TeslaCoils/Misc/NSTFilt.jpg

that you can check out for reference.

My first though would be that you are seeing a little resonant rise but
500pF is really small to affect a 12/400 modified NST.

There is a chance that the fewer shunts left in a saturating more esily and
the NST is loosing some if it's current limiting ability and acting like an
unshunted transformer but I would be really surprised to see that happening
with such a tiny capacitance.  Usually we see saturation only with really
large LTR caps on the output.

It is possible that the NST is just going from the 60BPS to 120BPS modes or
something as you turn up the power.

I really am not sure what is happeing without hooking test stuff up and
checking it.  I would just be sure the safety gaps are properly set and be
careful.  You may want to fuse the input of the NST.  That will help
protect it if shunt saturation is the case.

Cheers,

	Terry

At 01:27 AM 4/12/2001 -0600, you wrote:
>I am getting very close to completion of my huge coil.
>Today I put some small caps on my transformers because I was told by fellow
>coilers that it would help to protect them.  What I did was to put 4   500pf
>20kv caps, putting two on each side of the tranny, to ground. The tranny is
>two modified NST to run 12kv 400ma.
>Then just for fun, as I have done before, I ran up the roto and gave it some
>power.
>Sudenly the power output of my tranny seemed to double.  There were huge
>sparks coming from the roto. I thought it was a phase problem but as I
>adjusted the phase of the motor the sparks got even bigger and started to
>fire the safety gap on the trannys. Then I noticed that the power pull went
>from 30 amps to 38 amps.
>I got an 8 amp jump, just adding these caps.
>Not that any of this is bad. It just suprised me to se such a power increse
>in input amps as well as visiual output from the trannys by just adding
>these small caps.
>Have I done something wrong?
>Is the power increse going to hurt my trannys?
>Any coments would be greatly appreciated.
>
>Thanks all,
>Tyler
>P.S. You can see pics of the entire coil setup as well as the new caps that
>I put on at my web sight under TRANNYS on my 3rd coil.
>www.users.qwest-dot-net/~tsgeoman/coils.htm
>
>