[TCML] Big VTTC Suggestions Wanted
Dr. John W. Gudenas
comsciprof at ameritech.net
Fri Oct 3 22:06:44 MDT 2008
>> 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?
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
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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