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Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Why it is so difficult to find any information about company in question?
I happen to have couple of these:
For now they serve me as excellent foot rest and door stop.
Sticker says:
HiVoltage Components inc. ENERGY STORAGE CAPACITOR Model no. 6L600-20* (last letter marked as * is unreadable, may be x) S/N 205 3.0MFD VOLTS 20 KVDC
LARGO, FLORIDA U.S.A.
It would be very helpful to know basic things about these like their intended use, dielectric properties etc. Terminal style and size on both ends and weight (12kg) are giving me an impression that these arent average millisecond discharge energy storage caps.
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Hey, I have one of those too! (or rather its little brother, a 75 nF 50KV model) I haven't found any information about the company or the capacitor, either. I'm not sure they exist any more... I'm fairly certain they're very serious pulse capacitors, with low ESL and ESR.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Hi Kizmo thats a nice foot rest, I would like to know as well I have 2 .33uf@25kv units. it would be nice to know what they can do and what there ratings are as far as internal inductance. It's probly low
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
teravolt wrote ... Hi Kizmo thats a nice foot rest, I would like to know as well I have 2 .33uf@25kv units. it would be nice to know what they can do and what there ratings are as far as internal inductance. It's probly low
Very nice looking capacitors!
[edit] changed after realizing that teravolt's uF value is 0.33, not 2.33.
I'm sure that the kizmo specimen could make a good can-crusher if charged to rated voltage (with lethal energy of 600 J). With two in parallel and attention to efficiency, I think you could make a dent with 3 or 4 kV, and cut cans in half with full voltage. Because of the relatively low C and high V, I think the optimum work coil will have between 10 and 20 turns, with L in the 10s of uH, so interconnect and switch inductance are relatively uncritical and peak currents relatively low (<10kA). AWG10 or AWG12 wire will be plenty thick -- it would be a waste to use copper tubing. 20 kV switch will be the fun part. I wouldn't be afraid to try a dome nut on the end of a long insulating handle, brought close to a flat metal plate. Wear safety glasses and be prepared for a firecracker-like bang! Don't call us if you die from electric shock.
As for self-inductance, in this regime it can't really be separated from the inductance of the application circuit. Can be determined from the oscillation frequency of a short-circuit discharge from, say, 10 volts. I bet it's on the order of 10 nH. Smallest-L loop I can think of is with metal sleeve around the capacitor, connected on entire circumference at one end, with switch at the center of other end. Unless you can make an annular-gap switch!
[edit] maybe the stripe is for an internal structure asymmetry, for example the terminal connected to the outside foil layer, or the end with overpressure vent. Is the cylindrical case made of insulating material or painted metal? If metal, it seems too close to electrical terminal for 20 kV, unless operated under oil.
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