Re: PDT (Pig) failure modes (fwd)

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

Original poster: Tesla List Moderator <mod1-at-poodle.pupman-dot-com>



---------- Forwarded message ----------
Date: Wed, 18 Sep 2002 21:37:33 -0500
From: Crow Leader <tesla-at-lists.symmetric-dot-net>
To: Tesla list <tesla-at-pupman-dot-com>
Subject: Re: PDT (Pig) failure modes 

It does not sound like a water filled transformer supplier is reliable. I
tried to order from them before and the best answer as to age and condition
was "some look new".


KEN
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, September 18, 2002 8:59 PM
Subject: Re: PDT (Pig) failure modes


> Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<slwhite-at-zeus.ia-dot-net>
>
> Just a note of caution. Since T&R again seems to be willing to sell pigs
for
> Tesla coil use, let us be careful not to antagonize them by asking for
> replacements, etc.. Even though the transformer may have indeed been
> defective, I think it would be wiser just to eat one every now and then
than
> to beat up on them because one of their tranformers failed under Tesla
coil
> duty. I bought mine from T&R about a year ago and I want to keep them as a
> reliable supplier.
>
> Steve: Coiling in Iowa
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Tuesday, September 17, 2002 11:30 AM
> Subject: RE: PDT (Pig) failure modes
>
>
> > Original poster: "Dave Hartwick by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <ddhartwick-at-earthlink-dot-net>
> >
> > Godfrey,
> > Very interesting. I never considered thermal expansion as a factor.
> >
> > It is clear that repair is virtually impossible unless rewinding is
> > persued--forget it. By the time I do that, I may as well obtain
> laminations
> > and build a xfmr from scratch that is specifically designed for Tesla
> duty.
> > One feature of such a xfmr would be easily removable windings and a
> variable
> > magnetic shunt.
> >
> > I'm SURE Tesla duty would not be considered normal by T&R! I did talk to
> > them yesterday and they are not willing to replace the core, which is
> > expected. They are willing to sell me a complete replacement unit, no
> > questions asked concerning usage. Good enough for me, though I might buy
> one
> > from Dr. Resonance. I think there is some water floating around in the
> > bottom of the tank of this dead PDT, also some rusty chunks of
something.
> I
> > must think that I received the unit from T&R in this condition since
it's
> > just been sitting in my basement, well protected.
> > Dave
> >
> >
> >
> > Original poster: "Godfrey Loudner by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <ggreen-at-gwtc-dot-net>
> >
> > Hi Dave
> >
> > I had a similar problem with an old 7.5kVA industrial 120/240/480
> > transformer. By paralleling the two 120 windings, I could get up to 60
> amps
> > at 120 with a 240 feed. This was a great high current supply for playing
> > around with MOTs. One day the transformer went on a dead internal short
> and
> > the breakers tripped. The next day I was very surprised that the
> transformer
> > was working, but it shorted again after awhile. I decided to scrap the
> > transformer for the nice heavy copper wire. After much agony, I finally
> > freed the winding from the core. Upon removing the top layer of paper, I
> > could see burn marks between two adjacent turns. I think that heat
> expansion
> > would eventually push the two weak spots together, and after cooling off
> the
> > weak spots would separate. Maybe something like this is the problem with
> > your pole pig.
> >
> > When I got my pigs from T&R, I was told that they were under guarantee
for
> > one year for normal usage. I forgot to ask if tesla coiling was
considered
> > normal.
> >
> > Godfrey Loudner
> >
> > > What is truly a mystery about this thing is that it either works
> > perfectly,
> > > or acts like there is a crowbar dead short across the primary.  Well,
at
> > this point, I'm tentatively pronouncing Ariel dead. I'm going to
> > > call T&R to see if they can supply a replacement core so that I can
> > perform
> > > transplant surgery.
> > > Dave H
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>