RE: [TCML] secondary windings burning?

["Jim Mora" <wavetuner@xxxxxxxxx>]

Hi Bert,

It may be useful to state the type of wire preferred. I used to think
Formvar was king - way off. However, The other day I landed on a reputable
Mag wire site. It seems Polyamide rules. It has very high temp and highest
dielectric strength by substantial margins.

Jim Mora

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Bert Hickman
Sent: Tuesday, August 18, 2009 1:59 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] secondary windings burning?

mike osipowicz wrote:
> hello, I just finished my coil, but my secondary windings are glowing
> in some small parts, when its off it leaves little black spots on the
> magnet wire coating, any ideas?
> 
> 
> 
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Hi Mike,

It sounds like you may have a problem with the wire you used. Did you
accidentally overlap some portions of the winding? Did you use double
build (or "heavy build) wire? Was it brand new wire? Enamel insulation
on old wire can craze, or even flake off, and more modern insulation
systems can age and craze during winding. Since the secondary voltage
stress in a high performance coil can reach 2-3 kV per turn, using wire
with high quality insulation is essential.

Bert
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