Putting two potential transformers in series

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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