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RE: Protecting a potential transformer
Jay:
A bit of post mortem for us all...please.
When expensive 15/60's go, I want to know what NOT to do.
Did you use a safety gap? Did you use a Terry type MOV-R-C network (see his JPG
drawing
<http://users.better-dot-org/tfritz/NSTFilt.jpg>http://users.better-dot-org/tfritz/N
STFilt.jpg
The details could benefit us all. Thanks.
Ted R
-----Original Message-----
From: Tesla List [<mailto:tesla-at-pupman-dot-com>mailto:tesla-at-pupman-dot-com]
Sent: Sunday, May 14, 2000 1:27 PM
To: tesla-at-pupman-dot-com
Subject: Protecting a potential transformer
Original Poster: "Jay Stone" <jaykstone-at-home-dot-com>
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