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4hv.org :: Forums :: Tesla Coils
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The Super Fun Extremely Relevant Capacitor Thread

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Michael W.
Sun Mar 25 2007, 01:16AM Print
Michael W. Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324
So my local Science centre has come into possession of a, and I quote "2X.1MFD 80KV" Capacitor, its about a foot or so across (and tall) and about 10 inches deep. Now what kind of transformer would optimize the cap? I'm sort of afraid of what kind of coil would utilize this...
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Myke
Sun Mar 25 2007, 02:37AM
Myke Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
WOW amazed . That's a big cap. I bet it is from a telephone pole or from a small substation. Do you think it is like a pulse xfmr? Could you maybe show a pic.
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Steve Ward
Sun Mar 25 2007, 08:44AM
Steve Ward Registered Member #146 Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
.1 to .2 uF isnt *that* big if you get into pole pig power levels. Id doubt that its a suitable cap for TC use, but i could be wrong. Some pictures would be needed to figure that out.
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Michael W.
Sun Mar 25 2007, 02:39PM
Michael W. Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324
It was donated by an xray machine technition. I'll try and get a pic eventually If I go down there...It is quite large and heavy, I'm not sure If I could move it by myself.
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teravolt
Sun Mar 25 2007, 06:40PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
is it dc filter or pulse cap
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Michael W.
Sun Mar 25 2007, 07:26PM
Michael W. Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324
I'm not sure but I don't think its a pulse cap, I could be wrong though...
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Hazmatt_(The Underdog)
Sun Mar 25 2007, 07:40PM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
For .1, my LTR correction is about root(2)-1.5, so .1/1.5 = Cres = .067uF

Xc = 1/ 2piFCres, F = 60Hz, Xc = 39.6 K ohm,

Since its 80KV rated, lets go with a 40KVAC source, thatll give 2x for ringdown, which is needed.

I = E / Z = 40KV / 39.6 K = 1,01A (all peak)

P = IV cos(theta), say its perfect, P = IV = 40K * 1.01 = 40 KW

So that's ballpark for .1uF.

U = .5 C V^2, so you get 80 Joules of bang energy out of .1uF. I get about 3 feet/Joule, so you're looking at 27 foot sparks, how fun.
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Michael W.
Sun Mar 25 2007, 09:12PM
Michael W. Registered Member #50 Joined: Thu Feb 09 2006, 04:07AM
Location: Vernon, B.C, Canada
Posts: 324
Haha, Thanks for the number crunching. I think it would become more of a group project if we ever put it into use...
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teravolt
Mon Mar 26 2007, 03:07AM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
do you have a picture of the name plate and a picture of the cap
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