Re: 'suicidal' glass plates
>>From: "Kevin D. Christiansen" <kdc4n-at-cs.virginia.edu>
>>Subject: Suicidal glass plates
>>I then sat the whole unit on the carpet in my appartment
>>and slowly charged the capacitor up (with DC voltage)
>>by using a 15 KV neon sign transformer and a full-wave
>>rectifier, with a variac to control the output voltage
>>of the transformer. When I got up to about 12 KV (DC),
>>the bottom glass plate broke! Remember that the glass
>>plate is not even part of the capacitor - the capacitor is
>>simply sitting on the plate! I then continued increasing
>>the voltage, by slowly turning the knob on the variac.
>>Around 17 KV, the top glass plate broke! (Note that
>>here is no weight piled on top of the capacitor, either.)
>>Furthermore, I saw no corona anywhere (like you see when
>>a cap is used in a tesla coil).
>>What is going on here? I know that these glass plates
>>can handle _at_least_ 22 KV, since these plates were
>>previously part of another glass/aluminum foil capacitor
>>that I had made, and I routinely charged it up to 22 KV (DC).
> Voltage greater than 22kv was present???
How about a series LC circuit multiplying the neon's output
voltage by the Q of the LC circuit. In your old TC you had a load -
the arc - to limit the voltage. Here, there was no load so the voltage
increased until something gave. What is the reverse voltage limit of
you HV bridge? I would guess that the bridge has a much higher reverse
voltage breakdown otherwise the bridge would have blown rather than