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RE: [TCML] Hazards of Asynchronious arc gaps?
Hello friends,
It seems that I remember 400 BPS ASRG is a healthy break rate. I have a nice
duty cycle speed controller. If I ever get my rotary gap back from my
machinist, the big coil will come to life. (we have been caught in the on
going physical geometry/heat of the gap dilemma). He is often doing
aerospace quality machining, a hell of a nice guy, and a lurker on our list.
It is 18" g10 with 3/8 tungsten 2" long slugs. The "towers" x2 are holding
9/16 diameter heat sinked electrodes and can be series/parallel
SO, what is the optimum rotation speed? I bought all the copper before it
went ballistic in price (.5" x 100 feet primary). Of course this is directly
proportional to the power and the caps. I have a 5kva 14,400V potential
transformer and (2) .1uf serious, new, general atomics capacitors.
Let's have some feedback from the people that have worked with these
parameters. The coil form is 5:1 1/8" pvc x12" but can easily scaled to
larger sonotube. I have lots of 16 and 18 awg high quality magnet wire.
This has been back burner as I have making my own bio-fuel for awhile with a
drill press and 5 gallon stirrer. Off topic, but my 250 diesel loves it!
Please check in with your experience with these parameters!
Credit goes out to Salt Lake Jack for the GE PT which can be wired for
16KV@5KVA. I wish I could find another one!
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bartb
Sent: Tuesday, August 12, 2008 6:51 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Hazards of Asynchronious arc gaps?
Not only sync rotary's for NST's, but also ensure bps is at least 100.
Low bps can really cause some unexpected problems.
The em fields are intensified as are the nasty transients, so other
components around the house can be killed as well when running low bps
on a rotary or even async. I've mentioned this in the past. I killed an
xbox-360 and a sound card in the pc simply by slowing down the rotary
for only a moment (maybe 10 seconds). The firing during that time was
very erratic and I immediately increased speed (I just wanted to see how
the coil would react at low bps). It was later that I realized the
damage incurred. The damage and the out-of-the-ordinary low bps is no
coincidence.
By running async and/or low bps, all kinds of high voltage damage can
occur to your components. This is not like single shot mode where the
single shot is a one time event. Low bps is like many single shot
situations without voltage control. The voltages "will" climb to values
which the NST and cap may not handle. And as mentioned, other things in
the house can be affected as well.
It's really good learning experience however.
Bart
Harold Weiss wrote:
> Hi Harvey,
>
> With NST drive, you want to be running with a syncronous gap.
> Otherwise you may kill the NST by overvolting when the gap fails to
> fire on the peak, and the voltage rings up extremely high. That's
> probably what's happening to the caps as well. I have seen it go 7X
> on one coil, but generally, it's between 2-4X for most coils.
>
> David Weiss
>
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