Re: [TCML] NST shunt removal

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Yes, but not all NST's are configured the same. Even Franceformers. Some 
have packed shunts, and on others, it's part of the core. Some cores are 
easy to unbolt and remove the coil, others are not and would require 
cutting the core. So you never really know what your getting into until 
you get in there. Can be rewarding for some, and a waist of time for others.

Bart

Phillip Slawinski wrote:
> I have taken a perfectly functional NST and depotted it.  The results
> can be rather rewarding.
>
> On Mon, Jun 9, 2008 at 7:30 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
>   
> > Hi Alex,
> >
> > If the NST is in good working order, I would personally not modify it. They
> > are very easy to damage during the process. The only reason I modified my
> > NST is because I had killed it and at that point there was no harm in going
> > for it.
> >
> > Bart
> >
> > b alex pettit jr wrote:
> >     
> > > Hi Bart, et.al,
> > > &nbsp;
> > > So, from this, it seems that a full disassembly of the
> > > transformer ( coils from core ) must be performed to
> > > gain access to the shunt pieces ?
> > > &nbsp;
> > > I was hoping they would be more easily removed. I hate to potentially
> > > damage a fully functional NST.
> > > &nbsp;
> > > Thanks,
> > > Alex P
> > > &nbsp;
> > > *********************************
> > > My NST was a Franceformer 12/60. I burned a secondary. Well, I heated and
> > > removed the tar from the NST. I then cleaned up the secondaries, primaries,
> > > core, etc.. When I put it back together, I decided to take 1/2 the shunts
> > > out (exactly). The shunts were made of 4 bricks positioned around the NST
> > > core. I simply removed 1/2 of each brick (which were square laminations). I
> > > simply counted the total laminations in each brick and removed 1/2 of those.
> > > I expected at the time my current would double. I expected a 120mA NST.
> > > Guess what, I got a near 200mA NST out of the ordeal. Very surprising to me!
> > > The shunts are not linear to the current limit of the core. It is a
> > > differential increase in current, and as I realized that, it was that point
> > > that I decided to recommend no more that 1/2 the shunts removed from a
> > > depotting experience. Just a recommendation (if you feel compelled to remove
> > > more, by all means, have fun with it). About all I can say is that if you
> > >  remove 1/2 the shunts out of a Franceformer 12/60, you'll do better than
> > > double the current. Take care,
> > > Bart
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