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4hv.org :: Forums :: High Voltage
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Help me identify this cap

1 2 
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Bamacoiler
Fri Dec 12 2008, 06:02PM Print
Bamacoiler Registered Member #1628 Joined: Wed Aug 06 2008, 08:48PM
Location: Huntsville, AL USA
Posts: 95
 		I found this cap at work. I'm looking for a spark gap tank cap. It will be a pole pig system using approximately 10kva. Do you think this cap is suitable? The only info I have on it is that it measures 100nf. I assume it must be pretty high voltage considering the size of the insulators. Can you guys help me?
Link2

Edit: It weighs 14 lbs. There are no markings on whatsoever.

Do you think its a filter cap or a pulse discharge. I'm guessing pulse.
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Kizmo
Sat Dec 13 2008, 09:26AM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
 		It might be power factor correction capacitor from high voltage distribution line.
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Dr. Dark Current
Sat Dec 13 2008, 09:42AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Kizmo wrote ...

It might be power factor correction capacitor from high voltage distribution line.
in which case it is useless for TC.
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Mads Barnkob
Sat Dec 13 2008, 09:49AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
 		From the bushings its made for a pretty high voltage, so we could ask, would anyone PFC with 100nF at that high voltages?

For the size of the rods, it could be pulse, but is there anything else than to try?
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Steve Conner
Sat Dec 13 2008, 12:03PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		It's too small to be a PFC. They're typically about the size and shape of jerry cans.

If it were me, I'd hook it up to my TC and try it. From a safe distance suprised
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Kizmo
Sat Dec 13 2008, 09:23PM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
 		just keep run times short and check if there is any sign of heating
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MOT_man
Sun Dec 14 2008, 12:39AM
MOT_man Registered Member #1127 Joined: Mon Nov 19 2007, 12:08AM
Location:
Posts: 139
 		I've seen a few of these capacitors... I believe if you check the bottom of the can you will likely see a serial number or a stamp. I've seem similar caps being pulled Chinese made - laser and high voltage high current discharge scientific equipment. Most of these caps ran 25 -30 kV DC range -

A guess - sorry if it doesn't help to much.
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Arcstarter
Sun Dec 14 2008, 12:56AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
 		I know this may not be much help, but if running at 14.4kv with a pig, that is 10.368 Joules per bang if the cap has long enough to charge to full voltage. Does it look like it could take that at 120 or 240bps? I don't know, just saying so that maybe someone with more experience with capacitors can figure something out :P.

Judging by those rods, it just might be pulse. If it is pulse, that is one nice cap!
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Hazmatt_(The Underdog)
Sun Dec 14 2008, 02:45AM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
 		I wouldn't push that cap over 10KVAC let alone over 1KVA. I think that guy is gonna fail spectacularly.
It may be a pulse cap, but without specs. you're playing at your own risk.
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Arcstarter
Sun Dec 14 2008, 03:00AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Hazmatt_(The Underdog) wrote ...

I wouldn't push that cap over 10KVAC let alone over 1KVA. I think that guy is gonna fail spectacularly.
It may be a pulse cap, but without specs. you're playing at your own risk.
Very valid point. I say put it in something to contain any explosion that may take place, or just make a wall with bricks. If it explodes, you sure don't want to be in the way of it!
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