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

[Matthew Stevens <truesoutherngeek@xxxxxxxxx>]

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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