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Re: 25 kV PT



Original poster: "resonance" <resonance@xxxxxxxxxxxx>



Trying to run 50 kV on any transformer that is not in oil is a receipe for disaster.

Dr. Resonance




Adam - I wouldn't do it.  Not, at least, before doing
some more research on the particular unit.  I recently
found a GE JVT-200 PT.  200:1, 3kVA, two-bushing.
It's positively enormous, as PTs go!  Beyond hope, I
actually got an original hardcopy manual with it when
I picked it up.  The manual specifically says *NOT* to
ground one HV terminal unless operating at
substantially reduced voltage.  I forget the derating
factor.  It wasn't something obvious like 1/sqrt(2),
though.  It was even worse!  I assume this is all
because both sides of the HV are not insulated to 24kV
(or better) from the core.