[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [TCML] Turn-to-Turn short circuit
The coating is intact, but, as I said, the spool was unmarked. I haven't the
slightest idea what this wire is. It could be some kind of craft wire, for
all I know. To be safe, I think I'll just rewind it with some "documented"
magnet wire, so I know what it is! I also didn't take the time to count the
turns, but I will this time.
Thanks for all of your help, everyone!
Matthew
On Thu, Mar 19, 2009 at 3:41 AM, Jim Mora <wavetuner@xxxxxxxxx> wrote:
> Hi Matthew,
>
> Magnet wire can have very high rated insulation on it (polyamides or even
> other polyesters). This looked like green magnet wire. The question is how
> many turns are there and what is the voltage across the whole coil? PVC is
> conservatively rated at usually 600v. I have some milspec belden hookup
> wire
> that is over 1KV #18. It ain't cheap. I think Magnet wire is usually rated
> much higher like ^10 if it is not nicked or crossed. So:
>
> How much voltage?
> How many turns?
> Is that green the coating off the reel?
>
> Jim Mora
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of Matthew Stevens
> Sent: Wednesday, March 18, 2009 5:55 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Turn-to-Turn short circuit
>
> It's for a filter (2 to be exact).
> So what you're saying is that I should probably use insulated wire? Every
> set of instructions I could find was using copper motor type wire that
> looked uninsulated.
>
> On Wed, Mar 18, 2009 at 6:07 PM, BunnyKiller <bunnikillr@xxxxxxx> wrote:
>
> > Hey Matthew...
> >
> > Looking at the picture and seeing the cross over at the end of your
> > windings, take the time to re wrap those last couple of windings. what
> > concerns me is the mention of the usage of un-insulated wire.... ( you
> did
> > ask about using insulated wire and I am going to asume that you used bare
> > wire)...
> >
> > What are you using this coil for? Primary? Secondary? Filter
> application?
> > it makes a difference in application.
> >
> > Normal preferences apply as such
> >
> > Primary: uninsulated but given enuf air gap to act as insulated
> > Secondary: definately insulated since turn to turn voltages can reach
> 600+
> > V per turn
> > Filter Coils: still prefer insulation since turn to turn votlages can
> > exceed 100V
> >
> > If 50% of the wraps are in contact with each other you only have 50%
> > uninsulated which increases the turn to turn voltage on the uninsulated
> > wraps by an additional 50+ %.... thus needing more air gap between
> > turns...
> >
> > Scot D
> >
> >
> >
> >
> > Matthew Stevens wrote:
> >
> > This is a link to a picture of the coil in question
> >>
> >> http://drop.io/overlapped_coil_chokes/asset/100-1673-crop-jpg
> >>
> >> should I have used insulated wire?
> >> I am using an 8kv, 30mA NST for a power supply
> >> I think I understood what Stephen said, but I wanted to be certain
> before
> >> I
> >> powered up!
> >>
> >> On Sun, Mar 15, 2009 at 6:47 PM, Stephen Hiscock
> >> <stephenhiscock@xxxxxxxxx>wrote:
> >>
> >>
> >>
> >>> I'm assuming you are talking about a single layer inductor? and the
> wires
> >>> are all touching each other? and they are all insulated?
> >>> (if not insulated then you will have to work out the insulation of air
> >>> for
> >>> the gap between turns that you have)
> >>>
> >>> It depends on Voltage per turn (ie what is the final output voltage
> >>> divided
> >>> by the total number of turns),
> >>> The insulation of the wire ie what voltage will produce a discharge
> >>> through
> >>> the insulation of surrounding each individual wire,
> >>> and how far apart the overlapped the overlapped wire are from each
> >>> other..
> >>> eg you could have 20 wires overlapped if the over lapped wires are only
> >>> overlapping one at a time and are all spaced far from each other.
> >>> but if all next to each other, then it may be problem
> >>>
> >>> But saying this simply, if the Voltage per turn exceeds the wire
> >>> insulation
> >>> then you will have a problem ,but 99.99% of the time this won't apply.
> >>>
> >>>
> >>> regards
> >>> stephen
> >>>
> >>>
> >>> Matthew Stevens wrote:
> >>>
> >>>
> >>>
> >>>> If two of turns on a coil overlap, will it cause a short? I am using
> two
> >>>> chokes I made from pens and wire as RF filters, and one (only one) of
> >>>> the
> >>>> turns overlaps another. Just wondering if this would cause a problem,
> >>>> before
> >>>> I put current to the coil!
> >>>>
> >>>> Thanks!
> >>>>
> >>>> Matthew
> >>>> _______________________________________________
> >>>> Tesla mailing list
> >>>> Tesla@xxxxxxxxxxxxxx
> >>>> http://www.pupman.com/mailman/listinfo/tesla
> >>>>
> >>>> __________ Information from ESET Smart Security, version of virus
> >>>> signature database 3937 (20090314) __________
> >>>>
> >>>> The message was checked by ESET Smart Security.
> >>>>
> >>>> http://www.eset.com
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>> _______________________________________________
> >>> Tesla mailing list
> >>> Tesla@xxxxxxxxxxxxxx
> >>> http://www.pupman.com/mailman/listinfo/tesla
> >>>
> >>>
> >>>
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxxxxxx
> >> http://www.pupman.com/mailman/listinfo/tesla
> >>
> >>
> >>
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla