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4hv.org :: Forums :: High Voltage
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What is this capacitor useful for?

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mezzman
Sun Jul 18 2010, 03:08AM Print
mezzman Registered Member #3008 Joined: Sun Jul 18 2010, 03:02AM
Location:
Posts: 3
I recently found this capacitor and I'd like to know what it is best used for. Is it a PFC cap? I was thinking it might work with a really large tesla coil. My hope was using it for energy discharge projects, but I'm not sure it can do that safely.
The specs are as follows (as printed on the side): Axel 8341 3.5mfd 20% 33kvdc.
Any ideas?
1279422514 3008 FT0 Photo
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Adam Munich
Sun Jul 18 2010, 03:22AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Wow! Idk what to use it for, but i would definitely try shorting it through some thin wire.
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3l3ctrici7y
Sun Jul 18 2010, 04:21AM
3l3ctrici7y Registered Member #1806 Joined: Sun Nov 09 2008, 04:58AM
Location: USA
Posts: 136
Looks old.. does it say anything about pcbs?
If it doesn't say pcb free, I'd be hesitant about doing anything to it that could cause it to come apart.
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...
Sun Jul 18 2010, 04:29AM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
It definitely looks like a PFC cap, but if it was free there can't be much harm in using it for high energy discharge stuffs.

Nice find!
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HazzWold 1993
Sun Jul 18 2010, 06:04AM
HazzWold 1993 Registered Member #2563 Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280
Should try a can crusher with it. at 33Kv and nearly 2Kj it should tear it in half.
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HVgeek
Sun Jul 18 2010, 11:15AM
HVgeek Registered Member #2998 Joined: Tue Jul 13 2010, 08:34PM
Location: Swedish forests.
Posts: 26
Since it's DC I doubt it would be very useful for a tesla coil, but at those voltages and with such a large capacitor I'm thinking an EMP. Can crushers are cool and all, but I think the HV has more use in making a humongous EM-pulse instead. I think there was a truck mounted device that could blow the chips of computers up to 10 meters away, and it didn't look like it had much larger capacitor than that. I'm too lazy to come up with a link at the moment.
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UltraMagnus
Sun Jul 18 2010, 01:07PM
UltraMagnus Registered Member #2875 Joined: Mon May 24 2010, 08:28AM
Location: England
Posts: 42
3l3ctrici7y wrote ...

Looks old.. does it say anything about pcbs?
If it doesn't say pcb free, I'd be hesitant about doing anything to it that could cause it to come apart.

well, make sure you keep it in a strong container in case something does happen, but the isn't that bad a risk unless he opens it and drinks the contents, but I would imagine that would be a bad idea with any capacitor.
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radiotech
Sun Jul 18 2010, 02:12PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
a Capacitors for power factor use are rated in KVAR, Voltage and Frequency. As to PCB'S it if has no stamp or label that states "NO PCB"you should assume it contains PCBs.

You should connect a 14 guage wire across the terminals and to the ground studs on the case and keep it on until energised.

There is really no way you can test it at rated voltage easily without the gear needed. However if you connect it in series with a 25 watt lamp 120 volt 60 Hz, it should glow dimly. And if you tickle -spark the terminals through the lamp.if it is good it should give charge to about 160 volts DC that your DMM can measure.
Capacitors like that one are sometimes connected inside the terminal boxes of high voltage (13,800) motors for surge protection.

If you connect a 2 Henry choke in series with it, and can get 30 amps to flow through the circuit, it will yield 25 KV at 60 Hz, assuming you choke can withstand 25 Kv. (which is a way of saying keep it away from combinations of parts involving trsnsformers and other iron core coils)
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mezzman
Sun Jul 18 2010, 06:07PM
mezzman Registered Member #3008 Joined: Sun Jul 18 2010, 03:02AM
Location:
Posts: 3
Luckily it is PCB free.
I can't tell if it is DC though, there are no polarity markings anywhere on/near the terminals.
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radiotech
Sun Jul 18 2010, 07:45PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
You said "Axel 8341 3.5mfd 20% 33kvdc.
Any ideas?"

so it has a DC rating.

If it was connected to a a 25 kV 60 Hz system it wold draw about 30 amps and would source 7500 KVAR. Sometine you see 3 of those on poles at some point in long rural lines. Where did you find it?
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