RE: Where to get 4kv 20ma NST?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Dan,

On 24 Sep 2002, at 7:58, Tesla list wrote:

> Original poster: "Mccauley, Daniel H by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>
> 
> > >>>>>>>>>Actually, the rules are as follows:
> > 
> > 1.  You must use a Franceformer 4020SE Open Frame transformer (4kV/20mA
> > rated with 115VAC input and with
> >     shunts installed)
> 
> The 115VAC input I can arrange (why on earth should Vmains make any 
> difference??). What's wrong with a 230V transformer running off 230V? 
> A transformer with a 115V primary and a Franceformer I cannot. I 
> guess I'm barred even from entering the starting gates.
> 
> 
> The Vmains makes a huge difference.  For example, someone uses a 115VAC,
> 4kV, 20mA transformer.  If someone used
> a variac which can output up to 180VAC, then you then have possibly now a
> 6kV, 30mA transformer.  Although this will
> ultimately kill the transformer, it is possible to work under short periods.

Ah - the use of a variac has to be cheating IMO. You will be starting 
the race on an uneven footing right from the word go if variacs are 
allowed. Sans variac, the transformers *will* in fact be equal.
 
> I'm not trying to barr anyone from entering any type of "contest."  The
> event was mainly for a few individuals which attend a private tesla event
> each year, but now its seems to be expanding out worldwide.  The whole goal
> of the competition was to be a competition in efficiency and build design.
> By using the same model transformer and same exact input requirements, this
> contest would be somewhat fair and accurate.  Now by introducing all these
> other types of transformers etc... there is too much variability.  

Well, I will just have to watch the competition from the sidelines in 
that case. I'm not willing to part with in excess of NZ$150 to 
qualify. To the best of my knowledge, those transformers are not 
available here.

I would like to propose an amendment to the "rules": restrict the 
input voltage to Vmains. That'll sort the design skills out.

Regards,
Malcolm

> Dan
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