Re: Ion inception voltage in oil

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

I guess it depends on the oil (type, how dry it is, etc). I'd bet 
that it's at least 4kv/mm based on the dielectric strength of diala-a 
(200kv/inch irrc). Never actualy tested that tho since you'd probably 
have to pour it in a 0 humidity clean room to maintain that.

Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, August 10, 2006 1:33 AM
Subject: Ion inception voltage in oil


> Original poster: Finn Hammer <f-h@xxxx>
>
> 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
>
>
>
> > http://hot-streamer.com/temp/CD942C20P15K-MMC-Capacitor-Lifetest.pdf
> >
> > Of course, we don't know the "function", only the limits.  At 500V 
> > (630 V ion inception voltage- dual series)  the plates have no 
> > ionization.  They moved down to 500V in the ratings since the 
> > voltage gradient is higher at the plate edges.  But at 500V/cap the 
> > life should be "forever".  At 2000V they show a decay step at 75 
> > hours.  I never tried any other voltages on the tester.