Re: Putting two potential transformers in series

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

Original poster: "RIAA/MPAA's Worst Nightmare" <mike.marcum-at-zoomtown-dot-com> 

Yup, if they're the 2-bushing type just parallel the primaries  and series
the secondaries with the 2 connected hv bushings also connected to ground.
They won't see more than the 7.2 kv each. Most nst's are built like this to
save half the insulation on each secondary half. I've actually done 4 like
this before moving on to x-ray formers and cascaded 3-winding types
(theoretically no limit to voltage but at $50 per 4kv, 450mA, can get
expensive and take up alot of space).
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, December 19, 2003 12:16 AM
Subject: Putting two potential transformers in series


 > Original poster: "Rick Richter" <rrichter1-at-houston.rr-dot-com>
 >
 >
 >
 >      Hi all,
 >
 >      I have access to a couple 7.2 KV potential transformers and was
 > wondering if I could wire their secondaries in series to get 14.4 KV,
which
 > seems to be a more desirable voltage to use for coiling. I know this isn't
 > a good idea for neon transformers, but since potential transformers have a
 > Basic Impulse Level (BIL) rating of around 100 KV, would there still be
the
 > possibility of flashover internally like with NSTs? I realize the I in BIL
 > stands for impulse, but at 7.2 KV maybe there's sufficient internal
 > insulation to wire them in series without the flashover risk. Anyone have
 > any experience in this area?
 >
 >
 > Thanks in advance,
 >
 > Rick
 >
 >