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Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Well, you won't find me giving you any links to myself, but all I can say is that if you follow the maths, you can't go wrong. Definately use LTR capacitor, that is at least 1.4 x resonant charging frequency. C=1/(2 x pi x f x Z) Z= (transformer output Voltage / transformer output current) f = line frequency Multiply C by at least 1.4. Set the safety spark gap to fire just outside the transformer voltage. I don't personally believe that the Terry filter is necessary if you have these articles set at the correct setting. Happy sparking.
Registered Member #1185
Joined: Thu Dec 20 2007, 04:40PM
Location:
Posts: 17
Goldsphere wrote ...
Well, you won't find me giving you any links to myself, but all I can say is that if you follow the maths, you can't go wrong. Definately use LTR capacitor, that is at least 1.4 x resonant charging frequency. C=1/(2 x pi x f x Z) Z= (transformer output Voltage / transformer output current) f = line frequency Multiply C by at least 1.4. Set the safety spark gap to fire just outside the transformer voltage. I don't personally believe that the Terry filter is necessary if you have these articles set at the correct setting. Happy sparking.
The second try it was set that way(minus the LTR caps) and after a minute of running jumped to the safety gap continuously and still blew the transformer I'm hoping the Terry Filter along with a higher capacitance will stop the transformers from blowing. I already bought the Terry Filter it can't hurt.
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Jeff Sadowski wrote ...
Any suggestions on what to do with the blown transformers?
Should I try and cut off the Insulators on the ends and toss them? or would the windings be useful? What about the cores?
Careful on the double-posting. It's against forum rules and may cause various authoritarian entities to descend upon you
Well... some people have luck repairing toasted NSTs, but in most cases the exact cause of death can't be determined without painstakingly melting off the tar (and/or using a tar solvent like gasoline) and partially unwinding them. The cores can be reused, and might be worth recovering if you think you could ever be bothered to wind your own transformer. Personally, I've never had enough difficulty getting additional transformers to consider making my own, but maybe I'm just a wimp. The ceramic bushings might add some aesthetic value to your Tesla coil or another HV project. I'd probably try removing them, but if it started to get too messy, I'd probably give up and just toss 'em.
Alternatively, there might be somebody here on 4hv who would want your dead NSTs. Who knows?
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I posted my LTR thread because it has information on my work and others work goldsphere. IF you've done any of the research please post that too. It's called collaberation.
I wrote up my EE350 notes on the transformer so people could do real determinations of the transformer and go to simulation, or hand calculate and actually get the real answer. That was important to me because some people say its not possible and my calculation shows it is, and its not that hard.
The insulators have fingers and you twist them then pull them out of the punched hole in the transformer can. Save them.
Save the core of the transformers too.
If you can, locate the burn spots and you may be able to convert your 15/30 into a 12/30 or 12/45 depending on where the burn spot is and how many shunts you wish to remove.
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transformers keep blowing up for me :-(
