Re: Ion inception voltage in oil

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Finn,

When we do all the 2D or 3D finite element E-field analysis stuff and 
volts, per say, meter stuff.  That gives is a volts per distance 
stress number.  If that exceeds the number for the oil, disaster is 
expected...  Someday...

So if we have and edge of metal at say a voltage stress of 1000V/mm 
and the oil is rated at 1001v/mm we are fine.  But if the oil is 
999v/mm, then corona starts "in the liquid" oil and it starts to 
"burn" in a way and degrade.  Unlike air, damaged oil is not 
replenished with a fan...

In practice the numbers are far more drastic...  But the voltage 
standoff for oil is really high and if you exceed it your are super 
pushing something way way above the normal... >;-)))

Cheers,

        Terry




At 11:13 PM 8/9/2006, you wrote:
> All,
>
> I am wondering how high up the ion inception voltage is moved, when 
> the parts in question are put under oil. Anyone?
>
> Cheers, Finn Hammer