Dielectric constant (permittivity, epsilon) doesn't correlate well with dielectric breakdown strength. Consider salt water which has epsilon close to 80
What you want is high breakdown, non flammable, not hygroscopic, not forming tiny droplets of water, etc.
Epsilon doesn't have much effect, although high epsilon actually increases the volts/meter field, and increases the energy stored per unit volume, which often increases the chance of breakdown
On Nov 25, 2013, at 17:06, <mrapol@xxxxxxxxxxxx> wrote:
> ----- Original Message ----- From: "Jim Lux" <jimlux@xxxxxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Monday, November 25, 2013 4:25 PM
> Subject: Re: [TCML] Unusual dielectric media
>>
>> Why are looking for high dielectric constant liquids to immerse capacitors in. Aren't you using it in this case as just an insulator. That is, you're not using it as the "inside" of the capacitor dielectric.
>>
>> Typically, for an insulator, what you look for is robustness (breakdown voltage doesn't change with small amounts of contaminants), lack of spoilage, etc. (most liquids have very similar breakdown voltages)
>
> Yes, I am immersing ready-made capacitors (in this case, usually high voltage ceramic "doorknob" caps) in high K media to suppress corona, arc-over, etc. I have in the past potted Cockroft Walton multipliers and cap arrays in paraffin wax, but I was curious to try some liquids with high K values. I know many coilers use transformer oil or even motor oil to insulate components, but glycerin and syrup have very high K values. So far, glycerin has work very well.
>
> PBT
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