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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
Posted to rec.crafts.metalworking,sci.electronics.design
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Safely testing 22 kV capacitors
If you want to test them closer to their actual rating, you could charge two
caps to 9kv each, and then hook them in series across a single, giving you 18 kv. Doing it all with broomsticks, of course. For discharge, you could point a steam hose in their vicinity. Again, with a long stick, and from a good distance. I would start by inventing remotely operated aligator clips. |
#2
Posted to rec.crafts.metalworking,sci.electronics.design
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Safely testing 22 kV capacitors
Leo Lichtman wrote:
If you want to test them closer to their actual rating, you could charge two caps to 9kv each, and then hook them in series across a single, giving you 18 kv. Doing it all with broomsticks, of course. For discharge, you could point a steam hose in their vicinity. Again, with a long stick, and from a good distance. I would start by inventing remotely operated aligator clips. Connecting differently charged caps like these together with wires will end up with no wires and much noise. And, any resistance, from just the wires themselves to high value resistors will burn off half the energy transferred (if the wires live long enough to complete the energy transfer.) And, if you have a 0.5 uF cap charged to 18 KV, and connect it to a discharged 1 uF cap, you would expect the final voltage to be 2.25 KV, I think, due to the smaller cap value (2 1 uF caps in series) charging the 1 uF, and the loss of energy on transfer. This is a standard exam problem. Jon |
#3
Posted to rec.crafts.metalworking,sci.electronics.design
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Safely testing 22 kV capacitors
["Followup-To:" header set to sci.electronics.design.]
On Thu, 30 Mar 2006 21:44:08 -0600, Jon Elson wrote in Msg. Connecting differently charged caps like these together with wires will end up with no wires and much noise. A great aphorism! robert |
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