Tyler,
Two things you mentioned indicate that your defect may not be too serious.
You said that there was debris floating on the surface if the oil in the
can.
This suggesy to me that the fault may be above the oil level as fault
products would seem to be heaver than the oil and sink.
Also you mentioned that one of the bushings had been replaced. My long
history of working on things tells me that very often the cause of the
problem was the last time it was worked on.
Replacing the bushing is a simple task but still must be done right.
On the subject of pole transformers for sale there is a company about 20
miles northwest of Orlando in Zellwood that is licensed to recycle
transformers.
They sell them for $7.00 dollars per kva.
I got my 10 kva for $70.00 dollars.
The name of the company is TRC America. You should find them on Google and
Google Maps.
Phone 407-703-8577.
Teddy
On Jan 4, 2019 9:02 AM, "David Rieben" <drieben@xxxxxxx> wrote:
> Tyler,
>
> Wow! Although $700 may be a decent deal for a 25 kVA pig these days, it
> ain’t cheap at all, at least not to me! Especially when it dies on you so
> soon after the purchase! Can you provide any details on the capacitor that
> you were using (uFd, kV rating) and whether you were placing the capacitor
> in parallel with the Jacobs ladder rails or in series between the
> transformer bushings and the Jacobs ladder rails?
>
> Like I said, I have let the magic smoke out of a couple of smaller
> transformers in the past by simply seriesing the hv output of the pole
> pig’s bushings through a capacitor. I found that if the capacitance was in
> the correct range, it would form a near resonance with the transformer’s hv
> output and allow the power arc to drawn out to several feet before
> breaking, as opposed to mostly 12” to 18”, at best, before breaking without
> the capacitor. I should mention that my ballast allows about 100 amps to be
> drawn when shorted across a 240 volt AC source and when I applied the line
> voltage to my transformer, it would draw upwards of around 80 to 90 amps
> (w/out the capacitor). Also, with the correct sized capacitor, the power
> arc is much louder and the current draw INCREASES (and can momentarily peg
> out my 150 amp ammeter, through my same ballast!) with increased arc
> length, as opposed to DECREASING current draw with arc length increase
> without the capacitor!
>
> Your experience, as well as my past experiences with a smaller (5 kVA)
> pole pig and a 3 kVA PT, is starting to make me reconsider this practice
> (google “arczilla”) with my own 25 kVA, 14.4 kV transformer! Maybe the
> ferro-resonance that Jan mentioned is what’s happening here and may not be
> healthy practice for any pole transformer?
>
> David
>
>
>
> Sent from my iPhone
>
> > On Jan 3, 2019, at 2:29 PM, Terry Oxandale <toxandale@xxxxxxxxxxxxx>
> wrote:
> >
> > I know we would see static charges develop during oil filtering/filling,
> but these were very short-lived changes, but still enough to get your
> attention.
> > On Thursday, January 3, 2019, 1:07:31 PM CST, Teslalabor <
> teslalabor@xxxxxxxxxxx> wrote:
> >
> > How should this be possible? If there is any tiny charge, it surely is
> > not dangerous?
> >
> >
> >> Be sure to ground all terminals for a few minutes before disassembling.
> Some of these can hold a charge for a long time.
> >>
> >> Sent from my iPhone
> >>
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