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Re: [TCML] NIST High Voltage Laboratory Testing / Safety Reference



Dave,

Thanks a million for your reply; you have given much to think about.

Bob in Bellflower. 
On Sun, 31 Aug 2014 19:29:51 -0400 David Speck <Dave@xxxxxxxxxxxxxxxx>
writes:
> Bob,
> 
> I don't see any transformers in the photo list that you indicated, 
> but 
> with the description of a 100 amp line filter, I'd guess that the 
> setup 
> is for a utility pole (a.k.a. pole pig) transformer.
> 
> These usually were run backward to transform 240 VAC at high current 
> 
> into 5 - 25 KVA of 14,400 volt output, at a current rating depending 
> on 
> the size of the transformer in question.  5 or 10 KVA units were the 
> 
> most commonly used ones among TC builders, unless they were going 
> for 
> truly monster coils.  Transformers bigger than 10 KVA tend to be 
> unmanageably heavy unless you have a dedicated lab with a smooth 
> concrete floor and a crane to handle them.
> 
> These were once readily available from D. C. Cox for something in 
> the 
> ~$250 price range, plus LTL truck freight shipping, which ran 
> another 
> $250.  You could buy several for just a slightly greater S&H charge 
> if 
> they went to the same destination.  I remember doing a group buy of 
> 5 
> pieces for myself and 3 friends about 12 years ago.
> 
> Regrettably, D. C. has passed away and so has the last easy source 
> of 
> pole transformers available to the TC builder community.  Another 
> transformer rebuilding outfit that was once available to TC 
> experimenters will no longer sell to mere mortals.
> 
> I did a quick scan of eBay, and found some reasonably suitable units 
> in 
> the  $800 - 1500 range, plus shipping.  If you are patient and 
> lucky, 
> you might find one at a lower price eventually.  Large industrial 
> potential transformers may get you from 0.5 to ~2 KVA in a single 
> package, but these tend to be expensive, unless you are lucky enough 
> to 
> find one at a bargain price.
> 
> A series stack of 4 beefy microwave oven transformers can deliver a 
> 
> respectable ~8800 volts at ~500 mA, or ~4.4 KVA, which competes 
> favorably with the best of the potential transformers, and is way 
> cheaper.
> 
> Probably the best avenue now is to get one from another coiler who 
> is 
> moving on to SSTCs.  The days of big iron disruptive coils are 
> numbered, 
> though IMHO they are simpler and more bullet proof than the SSTCs.
> 
> You might also investigate DC resonant charged TCs.  I believe that 
> 
> Richie Burnett in England has a magnifier system that makes 10 foot 
> 
> discharges with only two microwave oven transformers in series as a 
> 
> power supply.  These are a lot easier to  acquire and transport, 
> though 
> the coil design is a bit more complicated.
> 
> Dave
> 
> 
> On 8/31/2014 1:38 PM, rd_parker@xxxxxxxx wrote:
> > A couple of questions if I may: 1 - what would be the cost of a
> > transformer such as you are displaying, and 2) what is the 
> expected
> > voltage generated and the voltage input? I am new to this 
> 'hobby'.
> >
> > Thanks,
> >
> > Bob in Bellflower.
> 
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