Re: General Questions

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jason Petrou by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jasonp-at-btinternet-dot-com>

no water really isnt a very good insulator - por a jug over a mains socket
and find out :)

Jason
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, April 09, 2001 2:10 AM
Subject: Re: General Questions


> Original poster: "davep by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<davep-at-quik-dot-com>
>
> Tesla list wrote:
>
> > Interesting...  I know epoxies like to work around the ~20Kv area but I
> > have never heard of problems at the ~200kV area...  I would be
interested
> > to hear more on this...?  Even plate glass will blow right through at
> > ~200kV.
>
> Depends on the thickness....
> and the quality.
>
> > Only oil is a real good insulator at really high voltages.
>
> And air.  And porcelain.  And epoxy.  And water.  and SF6...
> And vacuum.
>
> (yes: Water.  As I've mentioned, near here (powering this
> post in part) is a +/- 500kvdc (DC) converter.  For cooling
> AND insulation of the switch stacks:
> Very Pure Water....)
>
> Now getting That Pure water for 'home' use is tricky.  As is
> SF6 and air and hard vacuum.
>
> > Epoxy will fail from over voltage but melting and any "odd"
> > problems with epoxy at these super high voltages would be new to me.
>
> 'air' is tricky (as has been noted by others):
> Generally:
> Increasing pressure increases dielectric withstand.
> Decreasing first decreases, then as Serious vacuum
> is reached, the withstand goes up again...
>
> best
> dwp
>
>
>
>