Re: Defeat the SGFP Transformers!
On Wed, 09 Jun 1999 12:49:09 -0600, you wrote:
>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>At 01:46 AM 6/9/99 -0400, you wrote:
>If anyone has info on these let's get it posted and let the fun begin!
>I wonder if a Tesla cap discharged into the relay would help to weld it
>closed :-)) Hopefully, we can figure out the work around before we ever
>see the first one. Of course, the neon sign guys may do it for use if the
>thing works as poorly as I suspect... Hopefully, the new gizmos will fail
>often and send large numbers of almost new transformers to Tesla land... I
>bet the new designs will be dropping like flies. Just a new bunch of parts
>to fail. This may be a good thing for us.
>Sounds like a new challenge indeed! Just what we like :-))
A couple of thoughts -
Assuming the relay is controlled by some electronics, it may be
practical to zap the control circuitry with a TC - semiconductors tend
to fail short, so hopefully the relay will be held on. Use with a
variac could still be a problem, though, as the relay wouldn't cut in
below a certain voltage.
Epoxy can be dissolved off, but the solvent would probably take
winding insulation with it. It may be possible to do a partial
immersion to dissolve the epoxy just as far as the relay contacts.
I wonder however if these requirements will accelerate the move to
'electronic' high-frequency transformers - the higher cost of the
electronics would be partially offset by the protection circuitry,
which could be implemented more easily on electronic units - now that
would be the _real_ tragedy!