RE: [TCML] Transformer Dielectric

["Lau, Gary" <Gary.Lau@xxxxxx>]

Why is it that one must drop the NST into oil to measure the modified current of a deshunted NST?  Makes no sense.

As far as requiring vacuum impregnation equipment - I don't see that immersing the NST in transformer oil is any different than immersing it in melted wax.  Both are very low viscosity and would do a reasonable (albeit imperfect) job at displacing air.  I'm unaware of anyone on this List using vacuum impregnation for anything but rolled caps.  I would agree that if the option exists, vacuum impregnation would be a good thing to do, but very few have the equipment to do that.  I find it hard to believe that one can expect a failure in short order if it isn't done.  I repotted my NST at least 3 years ago in melted Vaseline jelly without pulling a vacuum and it's still doing well.

And why not a metal tank?  I repotted my NST in its original metal case.  Granted, one must take into account the issues of leaking, but by using melted Vaseline, that issue went away.

Regards, Gary Lau
MA, USA


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of DC Cox
Sent: Sunday, June 08, 2008 3:30 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Transformer Dielectric

As you remove shunts, you must drop it into oil for new current output
testing.

A plastic Wal-Mart tub works fine.  Fill with xmfr oil.  Keep dropping it
back into the oil for testing as you keep removing shunts.

Forget the wax.  Without vacuum impregnation equipment it's very hard to
do.  Just pouring wax into a tank will not insure you are properly
impregnating the windings.  It will fail in short order if you have any air
bubbles in it as it hardens.

I would avoid a metal tank, and definitely use oil not wax.

Dr. Resonance




On Sat, Jun 7, 2008 at 3:39 PM, Phillip Slawinski <pslawinski@xxxxxxxxx>
wrote:

> If I'm going to be removing shunts from my transformer is it better to
> put it under oil, or could I put it in wax?  I'm putting it in the
> sealed metal box it came in.
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