Re: SV: NST resonance, also NST Failures

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Garry by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Garry-at-ndfc-dot-com>

The NST I had was exibiting this kind of behaviour as well as arching to
the core. I inserted the entire thing into mineral oil put a stop to that.
It works great so far. So, if this happens, to a depotted xformer try
inserting it into mineral oil. It might just work for you too. 
---------- Original Message ----------------------------------
From: "Tesla list" <tesla-at-pupman-dot-com>
Date: Sat, 10 Feb 2001 20:15:26 -0700

>Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>
>
>Hi Jon,
>
>Wow!  That is interesting!  That is just the kind of odd arc path "I" would
>expect from RF hitting a big winding like that.  Thanks for passing this
>info on.
>
>Cheers,
>
>	Terry
>
>At 10:02 PM 2/10/2001 -0500, you wrote:
>snip...>
>>On the topic of NST failures related to HV RF, I have performed a post 
>>mortem on
>>two such about ten years ago. In both cases I found the failure mode to be 
>>inter
>>layer arcing along the outside edge of one secondary coil. Both arcs were
from
>>one end of the outer layer to a point about one third in towards the bobbin,
>>burning the edges of the paper insulation between these points and the
>>insulation off the wire. The wire was also found to be burned open at the
>inner
>>most point of the failure site. At the time of failure, these had been in use
>>without safety gaps or other filtration.
>>
>>For the record...
>>-- 
>>Jon G. Tebbs
>><jgtebbs-at-eos-dot-net>
>>
>
>
>