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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Are those capacitors pulse rated? I ask because the fluted terminals are really big and generally pulse rated capacitors have either very small terminals or internally threaded terminals. If they aren't, then i'd be very careful as i've seen capacitors that look like these fail spectacular under high current discharges.
Registered Member #3616
Joined: Fri Jan 14 2011, 08:47PM
Location:
Posts: 34
GE Potential transformer - puts out just under 40kv 50kv, 2.5uF caps - custom built (do not know if pulse rated) Inductors - hand wound on 4 inch pvc pipe Rectifier - 17 series microwave oven diodes Spark gaps - welded 1 inch ball bearings onto bolts (adjustable) Vessel - Made of 3/4" thick nylon plates
I am using this machine to break up rocks to liberate precious gemstones from background material.
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Oneironaut wrote ...
Thanks,
Yes, the caps were custom built by General Atomics. I believe they were for radar use, but can't be sure.
I arrived at the Joules figure by being lazy and using the calculator on this website...
250vk and 2.5uF
Brad
Keep in mind that in marx generator capacitors are charged in parallel and discharged in series. During charging you are charging 12.5µF 50kV worth of capacitors. Once spark gaps fire, your capacitors will be in series. Voltage is 250kV but so called erected capacitance is 2.5µF/5 -> 0.5µF
Quick calculation reveals that stored energy on both states is same
12.5µF 50kV -> 15.625kJ 0.5µf 250kV -> 15.625kJ
But still it will be mighty bang :)
EDIT:
Uncontrolled and uncountained 70kJ looks like this:
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78000 Joules Ready to Fire!
