Re: Variac in Overdrive

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

Original poster: "Yurtle Turtle by way of Terry Fritz <twftesla-at-qwest-dot-net>" <yurtle_t-at-yahoo-dot-com>

Thanks. I just tried feeding the 15/120 you sold me
with 140 volts. WOW! Now I know what I've been
missing! It actually made me jump when I first hit it.

thanks
Adam

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> 
> Hi Adam,
> 
> I "think" you will be fine since variacs are pretty
> well ovedesigned.  If
> you can measure the open load current, look for just
> the variac drawing
> higher than normal current on the input side.  Core
> saturation is the
> problem and if that happens the current will be
> abnormally high.
> 
> Cheers,
> 
> 	Terry
> 
> 
> At 03:14 PM 10/25/2001 -0700, you wrote:
> >How much can you overvolt a variac? My "small" 120
> >volt 17 amp variac doesn't have the taps for 140
> out.
> >If I set my variac for 120 in and 102.86 out, then
> >reverse the leads, I get 120 in and 140 out. This
> >results in approximately 16.7% overvolting of the
> >windings. Obviously, I then have reduced my variac
> to
> >a step up autotransformer that can't be adjusted on
> >the fly.
> >
> >Can a variac run like this for short (15 to 30
> >seconds) runs, or am I putting my variac's windings
> at
> >risk?
> >
> >thanks
> >Adam
> >
> >=====
> >Adam Minchey
> >yurtle_t-at-yahoo-dot-com
> >www.geocities-dot-com/yurtle_t/index.htm
> >
> >__________________________________________________
> >Do You Yahoo!?
> >Make a great connection at Yahoo! Personals.
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> >
> 
> 


=====
Adam Minchey
yurtle_t-at-yahoo-dot-com
www.geocities-dot-com/yurtle_t/index.htm

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