RE: [TCML] New Geek Group Video - How To Phase NSTs

["Lau, Gary" <Gary.Lau@xxxxxx>]

Paralleling chokes are only used when paralleling Variacs.  For NST's, one just ties the primary coils in parallel, and likewise the secondary coils, directly.  Even if the output voltages are not exactly the same, it's not a big deal.  The secondary impedance is pretty high, so it doesn't care.  Variacs on the other hand, have very low output impedances, so any voltage mismatch between units will result in damaging circulating currents, hence the need for the paralleling chokes.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Christoph Bohr
> Sent: Tuesday, March 31, 2009 1:55 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] New Geek Group Video - How To Phase NSTs
> 
> Hello Chris, fellow coilers.
> 
> Great video tutorial indeed, thanks for giving it to the community.
> One thought came to my mind. Of course even "identical" transformers
> will not be truely identical, let alone when they are identically rated, but
> from different manufaturers. Now, could and should one use some
> sort of parralleling choke, in cases where the rating differs more than tolerable.
> 
> I know, this is somewhat pedantic and in most cases will make no sense. But
> maybe its of interest to folks who work on a budget and have to make
> fit what they can find.
> As long, as such a choke is isolated from ground it should not have to stand
> extreme voltages... I am just curious.
> 
> best regards
> 
> Christoph Bohr
> 
> 
> ----- Original Message -----
> From: "Lau, Gary" <Gary.Lau@xxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Tuesday, March 31, 2009 7:08 PM
> Subject: RE: [TCML] New Geek Group Video - How To Phase NSTs
> 
> 
> Hi Chris,
> 
> You mentioned in the Part 1 video that when paralleling NST, both should have the
> same current rating.  What's the basis for this?  I don't think that this matters.
> 
> Regards, Gary Lau
> MA, USA
> 
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