Re: Rebuilding NST
On Wed, 30 Jun 1999 22:13:36 -0600 In the Tesla List
Adam <aspid-at-netzero-dot-net> wrote;
>I have unpotted a 15/30 nst and removed 2 shunt plates from each side
>of each secondary (eight total). Is that too many?
I've gone as far as removing 4 shunt laminations (two from each side)
no ill effects.
>...Now the primary is loose between the two secondaries. Should I move
>secondaries tight against the primary
NO, that will increase the tendency of primary to secondary breakdown!
>...or place some type of insulating shims between the primary and
YES! I use wax impregnated kiln dried wood wedges.
>I'm an engineer but not electrical, and am unclear as to whether it is
>the removal of the shunts that increases the current rating, or the
>of the secondaries closer to the primary.
The increased current capacity IS due to the reduced number of magnetic
The closeness of the secondary has no effect on a properly designed
>My next question is whether I should repot this in something, or run it
You will get much better longevity out of the transformer if you can
it in a plastic (methylene chloride adhered Plexiglass) case and fill it
light mineral oil. This will improve high voltage insulation and is a
conductor of heat to help keep the transformer cool.
Alfred A. Skrocki Sr.
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