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Re: variac
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To: tesla@grendel.objinc.com
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Subject: Re: variac
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From: jbiehler@teleport.com (Jerry Biehler)
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Date: Tue, 2 Apr 1996 20:29:35 -0800 (PST)
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>Subject: variac
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>Hi,
>
> I'm the proud? owner of an ancient looking 0-280 volt 28amp
>Powerstat. It seems to work OK, but I've only tested it on a 120 volt
>line and with a light load. On inspection, I see that the wiper
>brushes are worn and in need of replacement. Does anyone have a
>source for new brushes or the address of Superior Electric?
>
> Can this transformer be operated at higher current levels than its 28
>amp design spec? It has a 30 amp fuse, so this will obviously need to
>go higher. I would like to operate it intermittantly at 40-45 amps.
>Would forced air cooling help?
If you immerse it in transformer oil, you can usually double the amperage
capacity of the variac.
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Jerry Biehler, 360 S.E. Edwards St, Dundee, Or, 97115 (503) 537-2638
jbiehler@teleport.com http://www.teleport.com/~jbiehler
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"Waking up early is not a virtue. The old saw about the early bird just
goes to show that the worm should have stayed in bed. -- Robert A. Heinlein
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