Re: [TCML] multiple miniature transformers

[Chris Rutherford <chrismrutherford@xxxxxxxxxxxxxx>]

Hi Jim,

Given that the LV side will be open circuit on the not powered up
transformers, then surely the impedance will be high, presenting only
a small load?  Also even if there was some load, then this load would
reduce as more transformers were powered up, thus producing a
non-linear increase in power with each transformer?

Thanks

Chris

> Your power on switches will be on the LV side. One of the possible problems
> I see is the transformers not powered up will look to the energized ones as
> load impedances. You will also have to contrive a means to power that many
> transformers.
>
> I believe it was Richard Hull who said when you run out of space to walk
> around in, its time to step up to a pole pig.
>
> Play Safe,
> Jim Mora
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of Chris Rutherford
> Sent: Wednesday, November 11, 2009 7:27 AM
> To: Tesla Coil Mailing List
> Subject: [TCML] multiple miniature transformers
>
> Hi All,
>
> A couple of years back I made a TC powered by 4 parallel NSTs,
> providing 1KVA, which worked reasonably well.  I was thinking about
> extending the idea using 10 larger (identical) NSTs to provide 10KVA.
> I would individually protect each NST using something like a Terry
> filter, and also place a switch on the mains side of each transformer,
> so that I can switch each transformer on individually (perhaps using a
> relay).  In theory, this would allow me to ramp up the power in 1KVA
> steps to a total of 10KVA.  What problems can you foresee with this?
> Has this method of TC load control been tried before?  The advantage
> would be removal of the Variac and not having to lug a pole pig
> around.  Presumably the primary circuit can be modeled/ designed based
> on the parallel impedances of the transformers, at maximum input
> power.
>
> Thanks
>
> Chris
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