Re: Single-bushing 14.7kV pigs. Thoughts?

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

Original poster: DRIEBEN-at-midsouth.rr-dot-com 

Aaron, Weazle,

I too had a coil that I wired the pig in this fashion and it also
worked fine. The only difference from mine and Weazle's setup was
that my 14.4 kV, 10 kVA pig had two high voltage bushings but I
grounded one of these bushings and let the other one be "hot". I
also liked the idea of the primary and secondary coils being elec-
trically tied together at the base and the need for only one "hot"
high voltage transmission line from the pig to the coil.

David Rieben



----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
Date: Sunday, February 8, 2004 11:34 am
Subject: Re: Single-bushing 14.7kV pigs.  Thoughts?

 > Original poster: "J. B. Weazle McCreath" <weazle-at-hurontel.on.ca>
 >
 >
 > At 08:50 AM 08/02/04 -0700, you wrote:
 > >Original poster: "J. Aaron Holmes" <jaholmes-at-silicon-arcana-dot-com>
 > >
 > >After months of searching and drooling over hopelessly-expensive
 > 5kVA units
 > >on eBay, I finally found a cheap local source for used pigs (in
 > Seattle). >
 > <SNIP>
 > >
 > >Trouble is, they're the single-bushing sort.
 > >
 > >Now, this may or may not be a big deal; I've been a long-time
 > lurker on
 > >this list, but I've never gotten a good feeling for exactly what the
 > >downside is to having only a single HV bushing.
 > >
 > <SNIP>
 > >
 > >If this has been dealt with a million times, feel free to scorch me.
 > >I deserve it :)
 > >
 > >Regards,
 > >Aaron
 > >
 >
 > Hi Aaron, Coilers,
 >
 > My coils are presently powered by a single bushing 14.4 -at- 10 KVA PDT
 > which is working just fine.  On the dolly which holds the PDT and my
 > ballast choke, I also have a 30 Amp Corcom filter.  That's the point
 > where the power ground (the green, or 3rd. lead) ends.  The case of
 > the PDT is grounded only to my dedicated Tesla ground which happens
 > to be the ground point for the inner end of the primary as well as
 > the bottom of the secondary.  This has the advantage, as I see it,
 > of making the close proximity of the primary and secondary at the
 > same potential.  I've had no problems with this arrangement.
 >
 > 73, Weazle, VE3EAR/VE3WZL
 >
 > Details of my "Hyperbaric Gap" and Tesla coil are at:
 > http://www.hurontel.on.ca/~weazle
 >
 >
 >