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RE: Where to get 4kv 20ma NST?
Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
On 24 Sep 2002, at 7:58, Tesla list wrote:
> Original poster: "Mccauley, Daniel H by way of Terry Fritz
> > >>>>>>>>>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
I would like to propose an amendment to the "rules": restrict the
input voltage to Vmains. That'll sort the design skills out.