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RE: First Light for 10" Coil.
Original poster: "Peter Reid" <peter-at-reidconsulting-dot-com.au>
Hi Ben,
Thanks. My MOTs have all there primaries in parallel, and all the
secondarys in series.
There is basically two sets of 3 MOT's running antiphase, such that the
middle two's cases are grounded. For the MOT's that are floating at
higher voltages I removed the high voltage (ground) wire from the
transformer core so the core could float and hopefully help improve the
hv insulation a tad. I have all the transformers in three plastic
containers, It allows for them to be easily transported and connected
with just banana plugs for the hv, and screw terminals for the mains.
You can probably see on my web page how I have grounded one of the
boxes, with the green wire linking the two black terminals, then running
up to the safety gap etc.
The output voltage of my Transformer bank is about 12,000V, with an
output current of about 1.6A (shorted).
Regards
Peter Reid
-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, 25 December 2003 3:01 AM
To: tesla-at-pupman-dot-com
Subject: Re: First Light for 10" Coil.
Original poster: Ben Haylett <bhaylett-at-shaw.ca>
Congratulations on an impressive looking coil, Peter.
How do you (and presumably Ted as well) have your 6 MOTs configured? In
other words, what sort of series/parallel arrangement are you using, and
what would the output voltage be?
Ben
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, December 23, 2003 10:46 PM
Subject: Re: First Light for 10" Coil.
> Original poster: tesla <tesla-at-paradise-dot-net.nz>
>
> Greetings Peter
>
> A most interesting coil and quite similar to my own
>
> Very interested in the way you have done things
>
> The differences
> Mine has 90nF of the 1600v 0.33uF caps (like Robin Copini)
> SRSG is currently 300bps and all electrodes are near the 90deg and
270deg
> points. This needs fixing, How did you decide on the location for
your
> rotating electrodes to set timing
>
> I use PFC of over 100uF and up to 6 MOT's. The MOTs I have are in oil
and
> phased about ground. I use 900watt xfrmrs. I run fixed ballasting of
22mHy.
> I was intrigued by your ballast and would be interested in the short
form
> specs on that.
>
> I have just purchased the bits to put a dedicated outlet at the house
so
> should be able to run the thing flat out.
>
> My operating freq, toroids and so forth are pretty similar, I can
maker
the
> beast do 2 metre O/P but I know it will do better when I get SRSG
timing
> better and a dedicated mains. It will run > than 40amps if I let it
so
need
> to keep it at that level or things start to go wrong, like fuses
start to
> blow.
>
> Hope to hear more from your expts
>
> Rgds
> Ted L in NZ
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Wednesday, December 24, 2003 8:54 AM
> Subject: First Light for 10" Coil.
>
>
> > Original poster: "Peter Reid" <peter-at-reidconsulting-dot-com.au>
> >
> > Hello Everyone on the Tesla Coil Mailing List.
> >
> > I have just finished building my new MOT powered 10" Coil and
managed
to
> > tune it somewhat. I am quite happy with the results so far,
however I
am
> > wondering if anybody could shed some light onto areas I should
work on
In
> > order to improve the spark length and power handling capabilities
of
this
> > coil. So far I have managed occasional 8.5ft Power Arcs to a
grounded
rod.
> > However I feel that the coil is still capable of a lot more.
Initially
the
> > spark output was quite poor until I increased the coupling between
the
> > primary and secondary. (I don't think I've gone too far).
> >
> > I will list the specifications below. With the current setup I am
getting
> > quite powerful arcs to the strike rail and ground with-in about a
3ft
> > radius around the coil.
> >
> > I have posted some photos on my website for anyone that's
interested. I
> > also have some pretty good video footage, but that isn't on the
> > webpage.
> >
<http://tesla.reidconsulting-dot-com.au/>http://tesla.reidconsulting-dot-com.au
> > Any input / help with improving the current setup would be greatly
> > appreciated, I am just a little worried about burning up my
secondary
if I
> > try and pump any more power though it.
> >
> >
> >
> > Coil Specs are as follows..
> >
> > Primary
> > Flat Spiral, Wound with ½ In Copper tubing, spaced but ½ inch.
> > ID = 12.7in
> > OD = 32.5in
> > Turns = 10.25, tapped at about turn 6.15
> > Primary sits 1.5ft above the ground on a specially made wooden
platform.
> > Strike Rail = 1/2copper tube raised by ½ inch around outside of
primary.
> >
> > Secondary
> > Wound on a 10" PVC pipe, which has been baked and sealed with many
coats
> of
> > polyurethane.
> > Winding length = 41in
> > Wire Diameter = 0.9mm B&S Gauge 19
> > The bottom turn of the secondary is elevated 1 inch above the top
of
the
> > primary winding.
> >
> > Toroid
> > 12" x 42.5" (Tube Diameter x Outside Diameter of Toroid)
> > Mounted 12in above the top winding on the secondary.
> >
> > Measured Res Frequency of Secondary is 84.8kHz, and primary has
been
tuned
> > to exactly that. (Can someone please tell me if its worth trying
to
detune
> > it by 1/3 of a turn to account for streamer loading etc?.)
> >
> > Capacitor
> > 0.15uF MMC Cap Bank made up of 144, 942C20P15K caps.
> >
> > Power Supply
> > 6 MOT Supply, Currently Ballasted to 40A -at- 240V
(Using a
> > Sliding Choke Balast)
> > Maximum line draw current of 80A -at- 220v when the
ballast
is
> > removed. That's 17.6kVA J
> > Approx 12kV output.
> >
> > Spark Gap.
> > 200bps Sync Gap, with a Remote Phase Adjuster.
> > Single Gap, Tungsten static electrodes, and 4 x 8mm
brass
> > threaded rod (moving electrodes) Spinning on a 12in
> > G-10 disc (3000 rpm) Gap spacing is about 1-2mm total.
> >
> >
> > BTW, Thanks to everybody who has contributed to the mailing list,
the
help
> > I have received from you guys has been invaluable.
> >
> >
> > Regards
> >
> > Peter Reid.
> >
> >
> >
>
>