RE: Secondary Coil design

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Gary,
        I (wrongly) assumed no topload in my reply.

On 15 Nov 2001, at 22:21, Tesla list wrote:

> Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Gary.Lau-at-compaq-dot-com>
> 
> Hi Malcolm:
> 
> Terry's voltage gradient experiment showed that, particularly for a
> top-loaded coil, the voltage gradient is rather close to linear.  See
> http://www.hot-streamer-dot-com/TeslaCoils/MyPapers/NSVPI/NVSPI.htm
> 
> Gary Lau
> MA, USA
> 
> Original poster: "Malcolm Watts by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
> 
> The highest voltage gradient per turn occurs in the bottom portion of 
> the coil. Polythermaleze wire should <not> fail in that fashion so it 
> suggests to me that the wire insulation is not the best for this 
> application. I have tested polyesterimide wire to 8kVDC between two 
> adjacent wires (standard insulation thickness for 0.8mm wire). It is 
> rare that 1kV/turn will be exceeded in the base region except on high 
> energy coils. 

In that case, parasitic corona between the primary and secondary is 
the only thing that suggests itself.

Regards,
Malcolm