Re: [TCML] NST primaries

[David Dean <deano@xxxxxxxxxxxxxxxx>]

Hi

On Wednesday 04 June 2008 05:19:57 pm Mark Olson wrote:
> Hello all,
>
> My NST, originally a 15kv@120mA, has two prmary windings and two secondary
> windings. The primary windings are paralleled for 120v input.
>
> If I rewire the transformer primaries in series (keeping phasing correct)
> can It be used with 240v input?
>
Yes it can. I have done that with a 15/60 Francformer. You can see the result 
at:
http://deanostoybox.com/nst_modifi.htm

After frying the secondaries by inputting 2.8kVA with a much larger than 
resonant tank cap (burned the insulation off of the secondary windings), I 
removed the transformer and used it for a ballast for (one of) my polemount 
distribution transformers. The two 120V primaries in series for use with 240V 
input of course. In that configuration the measured short circuit current of 
the pig was 85mA. 

> I want to do this to decrease the input current requirement.
>
> Thanks,
> Marko
> kc5gym

later
deano

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