Re: Rebuilding NST

To: tesla-at-pupman-dot-com
Subject: Re: Rebuilding NST
From: Esondrmn-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Fri, 02 Jul 1999 12:45:11 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

In a message dated 7/1/99 2:29:20 AM Pacific Daylight Time, tesla-at-pupman-dot-com 
writes:

> 
>  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.
>  
>  
Adam,

I would press wood or plastic shims back in to get the windings tight on the 
core.  I had (as in past tense) a real nice 12 kv 120 ma transformer that I 
unpotted to repair.  I ran it dry and it shorted in the secondary.  I wish I 
had submerged it in oil, it would probably still be working if I had.

Ed Sonderman