RE: HV, oil and air

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

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-uswest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Chris:

It would be nice to pull air under vacuum, but professional vacuum machines
for such a job are extremely expensive. Some have build such a machine from
the unit in a refrigerator. But it is not necessary to pull the air with a
vacuum. Fill the transformer tank with oil. With the HV secondary open
circuited, run the transformer for about three hours to heat it up.
Occasionally apply a palm sander, without the sandpaper, to the side of the
tank. The heating and shaking will break loose most of the air bubbles. A
lot of X-ray technicians do not vacuum after they have changed the oil,
because the vacuum machine is just too expensive.

Godfrey Loudner


> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Wednesday, April 11, 2001 7:18 PM
> To:	tesla-at-pupman-dot-com
> Subject:	HV, oil and air
> 
> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <CTCDW-at-aol-dot-com>
> 
> Hello all!
> 
> I have aquired a HV transformer, a tank, and about 4 gallons of
> transformer 
> oil. Here's the question..
> I am going to drown this transformer in oil. when they fill pole
> transformers 
> with oil, (which does not completely fill them) do they put a vacuum on
> the 
> tank to get any air pockets out? I know this is very important for caps,
> but 
> I would think that it is just a critical for transofrmers. Any thoughts?
> 
> Thanks!
> 
> Chris W
> 
>