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Registered Member #102
Joined: Thu Feb 09 2006, 08:15PM
Location: Raleigh, NC
Posts: 169
Well there is a LOT fo talk about VTTC's lately, wierd.
ive been sitting on these caps for a while. two pics name plate reads as follows:
Lepel HF Laboratories SN 5-6555 type .0055 KVA 1500 Volts 9000 Amps 200 Freq. 540
Anway, I guess I know that these are good caps; they all read 6nF. What worries me is the freq, it's only 540, though I don't know what order of measurement that is.
Anyway they were used in an induction heater. Which used that triode I have, in what apeared to be an armstrong circuit. Power supply was a full wave rectified 5kV three phase transformer.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Using ohms law and the impedance of the capacitor you can figure out if they mean 540hz or otherwise. Given that its reactance at 540hz is nearly 50k ohms, you would only get .18Apk through it at 9000Vpk AC sine wave (far from the 200A rating). At 540khz, the reactance is about 50 ohms, so at 9kvpk AC, you would get 180Apk, much closer to the 200A rating. I would guess this means its rated for this frequency.
You have rather extraordinary capacitors there, i hope you do something great with them.
As to VTTC suitability. I would think that the tank Q is not likely to exceed about 10 or so, so the tank current might be 10X the average input current (rough figures here). So you would probably have to feed the coil 20A input current before exceeding the current rating of just 1 capacitor. Its likely you would over-volt one before that happened. I would definately series those caps up, and be careful. It might be worth installing some sort of voltage probe to be sure you dont kill those caps.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Wow, awesome caps! Can you see any hose barbs on them for water cooling? Having said that, they're rated at a crazy 1500kVA. So at a tank Q of 10 like Ward suggested, you'll need more than 150kW from the power company to overload one of those caps. Even at a Q of 100, it could take 15kW, and a Tesla coil won't have a Q that high unless it's mistuned so badly that it doesn't break out.
Registered Member #102
Joined: Thu Feb 09 2006, 08:15PM
Location: Raleigh, NC
Posts: 169
Hah! I'm loving what I hear.
I did want to try a sitiation where a break out point isn't used, at what cost would that be to these caps?
No the caps arent water cooled. Each one is about the size of a standard computer tower, (mini tower?) and they are filled with oil. (presumabally PCB oil O_O)
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VTTC Capacitor Suitibility
