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Re: [TCML] Big VTTC Suggestions Wanted
My HV pulse caps avoid oil which increases the Q factor substantially (over
20,000 vs. 12,000 for Maxwells in silicone oil).
I design in air (enclosed polystyrene box at 240 Volts/mil. Max is 100 kV
but I dereate them to 80 kV.
They run great up to 29.9 kV erms input.
On Fri, Oct 3, 2008 at 10:06 PM, Dr. John W. Gudenas <
> 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?
> 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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