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Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Kristian wrote ...
This is my third attempt at a 4 mot stack with the resonant capacitor. At least I got some video before I smoked the transformers this time.
Wowzers, there must have been a three-footer in there somewhere! This thread has been fun to watch. It makes me happy to see that folks still have fun just drawing big arcs off of transformer banks I'm a big fan of that too!
Pity about losing all those MOTs, though Kristian: I really dig the nice containers you made for them with the ceramic bushings and all!
Registered Member #611
Joined: Wed Mar 28 2007, 11:40PM
Location: Hudsonville, Michigan
Posts: 79
Myke wrote ...
Are the transformers under oil?
Yes, the second set, the ones that see double voltage where under mineral oil. They held up fine, until I ran them with the capacitors.
I had two identical mots in this position. They were insulated very well, and held up to everything I threw at it. The inside secondary lead broke off one of them right at the insulation. Every mot I've used to replace it has fried the secondary. The original, the one that didn't break, is still working fine, even after getting deep fried in mineral oil.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Kristian wrote ...
This is my third attempt at a 4 mot stack with the resonant capacitor. At least I got some video before I smoked the transformers this time.
Cool arcs. With 4 transformers you might need 0.5 to 0.75uF resonant capacitor (not 1uF), otherwise the transformers will get too hot quickly and you won't get any longer arc.
BTW where did you get such a number of microwave caps? I'm jealouos
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
The using coolers for hv enclosures is certinly a unique idea, although I wouldn't recomend it since the thermal properties of coolers are horrible (remember they can also be used to keep hot food hot). You might even be able to keep your mots running longer if the oil bath they are in had better cooling.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
He has his cap bank arranged as 5 strings of 5 caps, which will give the same amount of capacitance as a single cap--only the voltage and current ratings will be higher. It should be just about right for the application.
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Resonant MOT arcs
This thread has been fun to watch. It makes me happy to see that folks still have fun just drawing big arcs off of transformer banks 
I'm a big fan of that too!
Kristian: I really dig the nice containers you made for them with the ceramic bushings and all!
