Re: 25 kV PT

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Bert Hickman <bert.hickman@xxxxxxxxxx>

Tesla list wrote:

> Original poster: Yurtle Turtle <yurtle_t@xxxxxxxxx>
> I have 2 25 kV PT's like these:
> http://geindustrial.com/products/specs/pt62125.pdf
> Has anyone ever grounded one leg of a PT before? I
> know lots of folks have done this with their pigs
> (myself included). I'd like to run them in series for
> 50 kV out, but would hate to kill them.
> thanks
> Adam

Hi Adam,

It looks as though the insulation system for this transformer family 
should be able to operate at full voltage with one bushing at ground. 
A "one ear" version of a PT that's similar to yours (but 24 kV/200:1 
ratio) can be seen here:

http://geindustrial.com/products/specs/pt61125.pdf

The insulation system for the above transformer is rated for 
continuous 25.5 kV operation (24 kV nominal) with H2 grounded. It may 
be worth giving the GE folks a call to determine if H2 is nearest the 
core for the particular model you have. If so, it certainly looks 
like a pair of these PT's should safely provide 50 kV with the 
midpoint grounded. Nice transformers!

Bert
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