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[moved] 24,000j Capacitor Bank (Now Complete)

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LAN_403

FastMHz

Thu Oct 18 2007, 05:50PM

Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287

Hi all! Been a while since posting here....I have not had as much time to experiment lately, though that is changing. I've been dabbling in high voltage lately, rather than launchers...my latest experiments and builds can be seen on my YouTube page:

However, EM Launchers are my favorite...I am about to build a massive induction launcher. Whereas my existing discharge system was 3.5kj, my new one will be 24kj...that's not a typo...24,000 joules of energy...I have the capacitors already and will be building my bank soon. I do not know where on earth I'd find an SCR capable of switching that much current, so I'm thinking of building a large solenoid fired relay. My first coils will be about a foot in diameter, and single layer. I'll post as construction gets under way!

Simon

Fri Oct 19 2007, 03:53AM

Registered Member #32 Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549

24kJ? Wow. o_o

I'll bet you'll vaporise a lot of stuff trying to make that happen. Make sure you post pics, whatever happens!

andy73

Fri Oct 26 2007, 04:03PM

Registered Member #926 Joined: Thu Jul 26 2007, 04:09PM
Location:
Posts: 9

hi good luck, hope you dont kill yourself or a load of kit in the process, remember less is more....

Quantum Singularity

Sun Oct 28 2007, 05:31AM

Registered Member #158 Joined: Sun Feb 12 2006, 09:53PM
Location: Central Ohio
Posts: 282

Good to see your still at it man. I got to get back into it myself... my aquarium hobbies taking up most my time nowadays.

So what kind of caps you using? I'd hope with that much energy you scored some Maxwell pulse caps? Or you just making a really big array of lytics? You could probably use scr's if you had lots of money to burn, but I'd hope you have a high enough operating voltage you could simply use a spark gap switch. I'm building one very similar to Bert H.'s for when I get around to using my Maxwells (1.5" solid brass rods for contacts - machined, solenoid triggered). Oh and BTW I cant view youtube at work...and my home internet is down temporarily. I;ll have to remember to check out your stuff when I get a chance.

TodX

Wed Nov 14 2007, 12:38PM

Registered Member #1118 Joined: Wed Nov 14 2007, 09:42AM
Location:
Posts: 5

A 24kJ bank is damn impressive.
I thought you might be interested in these SCRs I found recently.

I actually just bought some for a Thompson coil/jumping ring CG I'm planning of building.
They're rated at 6000A@10mS pulse. If you're staying under 600v on the caps, then these
should work great for that massive cap bank.

FastMHz

Wed Nov 14 2007, 08:51PM

Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287

So I've finally gotten all the main bus bars on the capacitors....this bank will be configured for 4500v @ 2400uf.....enough energy to do some serious launching:

Capsbarredyp2

See my youtube vids to see what I've done with 3500j of energy....and imagine what 24,000j will do

Shaun

Wed Nov 14 2007, 09:14PM

Registered Member #690 Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616

My god man...thats insane!
Where/how did you score all those lytics?

BTW an AK47 bullet has 5kJ of kinetic energy...

Ken M.

Wed Nov 14 2007, 10:06PM

Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628

DEAR LORD!!!! Is all I really have to say, but that looks more like it would crush any metal that was near not even needing to be inside the coil.

FastMHz

Wed Nov 14 2007, 10:11PM

Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287

To give an idea of the size of the bank....here's a pic of my caps and I:

24kjcapbank2ny3

Sulaiman

Thu Nov 15 2007, 12:59AM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140

Nice Stack !

That's quite scary = hope you've got good eye, ear and body protection!

Anyway, have you considered re-arranging the capacitors and bars?
I would be tempted to put 5 capacitors on one bar, with alternate spaces.
Put another 5 capacitors the other side of the bar in the 'spaces'
(all the capacitors sitting flat as currently, with the bars on top)
continue .....
so you would end up with say TWO banks of (5 caps in parallel x 10 caps in series).
Two rigid simple banks with low esr.
Even electrolytics can discharge quite quickly so compact/low-inductance is probably worth considering too.

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