Re: [TCML] Big VTTC Suggestions Wanted

["Dr. John W. Gudenas" <comsciprof@xxxxxxxxxxxxx>]

SNIP,,,,,,,,,,,,SNIP

    I wrote:
> > Incidentally, a lower frequency VTTC ( 150kHz - 200kHz) is easier  
> > on the
> > tank cap.
>
> On Oct 2, 2008, at 10:08 PM, Phillip Slawinski wrote:
> Oh really, why is that?


Snip............Snip

Phillip
A specific dielectric constant is dependent upon heat, voltage,  
frequency and other parameters.
As the frequency increases less voltage is required to produce corona  
( "Electrical Coronas Their Basic Physical Mechanism", LOEB)
Consequently  a sinusoidal high voltage  V at frequency f will  
generate more heat and corona in a capacitor than V at frequency f'  
where f > f'.

So at high voltages and high frequencies corona increases and so does  
heat causing a lowered dielectric constant and potentially total break  
down.
This is a simplified explanation of a complex process, but sufficient  
to get the idea. Certain capacitors like mica, RF ceramics, and  
extended foil polypropylene resist breakdown.
Corona is suppressed by oil in the Maxwell  pulse capacitors plus  
using the proper dielectric and high voltage construction.

John W. G.

John W. Gudenas, Ph.D.
Professor of Computer Science


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