Re: switching a polemount transformer

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

Original poster: "Metlicka Marc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>



Tesla list wrote:
> 
> Original poster: "Crow Leader by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<presence-at-churchofinformationwarfare-dot-org>
> 
> So it seems some large mechanical switch or contactor will do. I've assumed
> the back EMF of a giant transformer would inst-destroy the "slowest" contact
> of say a paralleled 3 pole 20A generic contactor. I'll find one and see what
> happens.

It is nice to put a small snubber across the coil of the contactor, This
helps bring it in tight without chatter.
Take care,
Marc M.


> 
> KEN
> 
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Friday, August 31, 2001 10:25 PM
> Subject: Re: switching a polemount transformer
> 
> > Original poster: "Barton B. Anderson by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>
> >
> > Hi Ken,
> > I use a variac to increase the voltage from zero up as well as a variac
> for
> > a current ballast. This elliminates the
> > need to switch the pig on at full voltage.
> >
> > Bart
> >
> > Tesla list wrote:
> >
> > > Original poster: "Crow Leader by way of Terry Fritz
> <twftesla-at-qwest-dot-net>"
> > <presence-at-churchofinformationwarfare-dot-org>
> > >
> > > Greetings from Chicago.
> > >
> > > What do some of you  use to switch on an off a 10kVA polemount
> transformer?
> > > I browsed some catalogs and it seems a two pole 100A contactor is
> something
> > > like $400 and up (I"m not seeing any "value" there either). What about
> big
> > > stud SCRs or electrical disconnect boxes with the fun handle? Has anbody
> had
> > > problem with the inrush current?
> > >
> > > KEN
> >
> >
> >