RE: [TCML] Turn-to-Turn short circuit

["Jim Mora" <wavetuner@xxxxxxxxx>]

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
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