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4hv.org :: Forums :: Tesla Coils
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Is this transformer good for tesla power supply? + some TC desing

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Kizmo
Thu Mar 22 2007, 07:44PM Print
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Hi!

I got big and old transformer like this:

http://riemun.huuto.net/auctionimages/0/9b/158b4ebb27ae3fb4572ac16971449-orig.jpg

Primary 1x230V
Secondary 1x5500V, rated for 2.6kVA

Is this good for medium/large teslacoil?
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Andrew L.
Thu Mar 22 2007, 09:10PM
Andrew L. Registered Member #515 Joined: Sun Feb 11 2007, 02:06PM
Location: Slovenia/Ljubljana
Posts: 94
Wooow where did you get that "pig". amazed
I would say that it is pretty good for a medium/large tesla coil.
It would be good if you could have it submerged in oil when you are using it.
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Sulaiman
Thu Mar 22 2007, 09:21PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I think it would be good
BUT

-it's not like an NST or MOT, it has no inherent current-limiting
so I guess the best would be to use dc resonant-charging with a rotary spark gap,
maybe with a voltage multiplier ?

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Marko
Thu Mar 22 2007, 09:50PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Yes, as voltage is a bit low considering it's power, and you need a big current limiting inductor anyway, resonant charging may be good.


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Kizmo
Thu Mar 22 2007, 11:17PM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Yes, secondary voltage is a bit low. This is my 1st tesla and im allready planned to use resonant charging with rotary spark gap. At least i got fat arcs with that power :D

Is there simple way to make that voltage doubler mentioned earlier, does something like this work:

http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/ietron2/voldoub.gif
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Sulaiman
Fri Mar 23 2007, 12:26AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Yes, just like that.

It should give you about 15 kV dc.
With resonant charging you'll be up near 30 kV so smooth surfaces to reduce corona will be required.
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sparky
Fri Mar 23 2007, 01:51AM
sparky Registered Member #530 Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
Oh nice trannie!! Yeah, I'd be wanting to make a high powered DC power supply out of this unit. I bet on small runs you could easily push the transformer to 4kVA@15 kVDC without significant heating what so ever...

YOU MUST PUT THIS TRANSFORMER UNDER OIL!!! Its a must!!!
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Kizmo
Fri Mar 23 2007, 03:48AM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
So under oil it goes :)

(have to make aluminum countainer, put tranny in there and fill it up with transformer oil. Countainer will be grounded naturally)
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Coronafix
Fri Mar 23 2007, 04:47AM
Coronafix Registered Member #160 Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
I'd just put it up on some spacers in a plastic container under oil.
You can still ground it.
I don't think you'll get much heat coming off of it.
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Marko
Fri Mar 23 2007, 12:29PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
If the transformer wasn't designed to be run exclusively under oil, I wouldn't say it's an apsolute must considering it won't run 24hrs a day for weeks.

But it surely wouldn't be any bad, so put it under oil if you don't consider it too messy.


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