Protecting a potential transformer

• To: tesla-at-pupman-dot-com
• Subject: Protecting a potential transformer
• From: "Jay Stone" <jaykstone-at-home-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 14 May 2000 12:26:49 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hello fellow coilers!!!
 
Having recently blown up my second 15/60 neon on my 6" coil, I have decided
it's time for something different.  I have recently acquired a transformer
which I am told is rated at 20 KV, 2 KVA.  I am trying to get more info about
this xfmr such as BIL rating etc which I don't currently have.  I think it is
some sort of potential transformer.  It has multiple taps on the 120VAC side
for +/-5% and 10%, and a large, round epoxy sealed winding.  One side of the HV
winding is tied to gnd and the other to a single terminal on the top.  Does
anyone know what this is?  
 
Since one side of the HV winding is tied to gnd, I believe I will have to use
an Oudin coil configuration w/  one side of primary tank coil at gnd.  I plan
to use an unmodified 20A variac in series with the 120VAC side of the
transformer for ballast at least to start with.  I know it will probably
saturate and tend to overheat but I hope this will be ok for short runs.  Will
this work?
 
The other question I have is about protecting the HV side of the transformer. 
Should I use a safety gap and a choke or some sort of RC filter like one might
use on a NST?  Any recommendations would be greatly appreciated.
 
Thanks ,
 
Jay
 
 

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