Re: Rebuilding NST

Oil will make it better able to stand HV duty, but it can probably stand dry
running. 2 shunt plates is probably OK, but I wouldn't take out any more. (My
personal opinion, based on what I know about inductors--I'm not a transformer

About your other question, the relative position of the secondary and primary
has nothing to do with current rating, as long as they're on the same core.
Removing the shunts allows more flux to flow through the core, which means the
current limiting is reduced, which means more current out. If you remove too
many, either the core will saturate, which means it's magnetized as much as it
can be, and wastes a lot of energy (the input current starts to go up like
a x^3
function when it hits saturation, with essentially no change in output), or the
wire could overheat. The effect of the core's saturating is that a given core
can only take so much power through it.

            --Doug Brunner

Tesla List wrote:

> Original Poster: "Adam" <aspid-at-netzero-dot-net>
> 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 assumed that when people
> said they removed two, they meant two/side/secondary.? Now the primary is
> loose between the two secondaries. Should I move the secondaries tight
> against the primary, or place some type of insulating shims between the
> primary and secondaries? 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 moving of the secondaries closer to the primary.
> My next question is whether I should repot this in something, or run it dry.
> thanx
> Adam Minchey
> aspid-at-netzero-dot-net
> ICQ 9397016
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