[TCML] parallel operation of a single phase transformers.
resonance at wildblue.net
Tue Apr 15 20:33:00 MDT 2008
When you can pick up a used xmfr from most neon shops for $25-$50, and
considering the incredible amount of time, work, and precision required to
work with nst sec windings (typically 38 to 42 AWG wire), it really makes
more sense to scrap it out and pick up another xmfr.
I get them for $40, unpot them in the summer over a BBQ grill in a
throw-away aluminum pie pan, then pull out some of the shunts, drop them
into a Walmart plastic tub, and you have an excellent 200 plus mA xmfr that
delivers 12 kV for under $50 --- including the charcoal for the grill!
It can be done but it really is a stretch on your patience and certainly not
BTW, anyone on the list know Jack King's email or tel number? A friend of
mine is looking for some large variacs for a coil project, and I suggested
Jack might be a good source.
On Tue, Apr 15, 2008 at 7:18 PM, adegbamigbe tunji <tunji579 at hotmail.com>
> i would like you to help me on this question,with full explanation in
> details .
> what are the effects in practice of connecting transformers in parallel
> under the following conditioins .
> 1)different impedance ,same voltage ratios .2)different R/X ratios ,same
> voltage ratios.> Date: Tue, 15 Apr 2008 13:51:01 -0700> From:
> yurtle_t at yahoo.com> Subject: Re: [TCML] Windings Repair - Should This
> Work? Is There a Better Way?> To: tesla at pupman.com> CC: > > First of all,
> I'm assuming you're talking about an> NST. If so, simply unwind the wire
> until you get past> the damaged portion. Then solder the thicker wire that>
> was previously used, back to the "new" end. Retape and> you should be good
> to go. It's not as hard as it> looks. Reading glasses help to get really
> close to see> the small wire. You will still need to pot it in> something,
> as I tried running several dry and I> experienced flashovers that didn't
> occur when potted.> I used paraphen, but others have used vasoline, oil,>
> and even the original potting.> > Adam> > --- Tedd Payne <
> teddp2 at comcast.net> wrote:> > > Hi,> > > > I'm trying to solve a problem
> with a spark coil, but> > maybe the solution could also benefit coilers in>
> > some way.> > > > I've exposed a small section of the outer layer of> > the
> high voltage secondary winding. The wire is> > very small, I can barely see
> the individual strands.> > Here's the problem: 3 or 4 of the strands are> >
> broken and I'd like to repair them. I'm not trying> > to reconnect
> individual broken pairs, I think it> > would be good enough to just "short"
> all the broken> > ends together. I don't think I can use a blob of> > hot
> solder because I don't think I can adequately> > prepare the ends to bond to
> the solder, and I don't> > want to risk heat damage to the surrounding area.
> > > Also, access to the wires is limited, kind of like> > in a hole. I don't
> think I want to use a conductive> > paint or glue, because if it doesn't
> work then I may> > have made things worse by adding something which> > would
> be hard or impossible to remove. Here's my> > idea: use finely powdered
> silver or copper to try> > to fill the area around the breaks, maybe using
> a> > little liquid carrier which would evaporate cleanly.> > My thought is
> that enough powder would allow> > electrical contact among all the broken
> ends. If> > that works, then I would probably seal the repaired> > area in
> some way.> > > > So, do you think the powder would work? Do you have> > a
> better idea?> > > > Thanks in advance for your comments!> > > > Tedd> >
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