Did it work ?
John ZS5JF
----------
> From: Roy Koeppe <royanjoy@ncn.net>
> To: amps@contesting.com
> Subject: Re: [AMPS] 100KW induction furnace
To: <amps@contesting.com>
> Date: 20 January 1999 11:24
>
>
> I once built a crystal set....
>
> K6XK
> -----Original Message-----
> From: Kf8od@aol.com <Kf8od@aol.com>
> To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
> Date: Wednesday, January 20, 1999 2:42 PM
> Subject: [AMPS] 100KW induction furnace
>
>
> >
> >Hi All,
> >
> >Having a problem at my shop with a 100kw induction furnace. The
furnace
> heats
> >a billet for drop forging. The problem is when you start the funace
at
> about
> >50% the GFI in the switch gear trips. If started at a lower percent
it's
> fine.
> >But that is not good enough. The unit operates at 480v 3phase 2000
amps
> input
> >to the power supply. The output is 1200 vdc 1980 amps at 1000hz. The
input
> is
> >fed to the rectifier board which are SCR's. Then to a reactor on
both
> positive
> >and negative. then to a inverter. The GFI tripping is a inducation
of a
> >unbalanced load, according to one individual. My thought was a step
start
> on
> >primary of the power supply. The capacitors that shunt the SCR's and
the
> SCR's
> >themselves look like a short for a instant. There is one thing I
noticed on
> >the schematic that I thought was not rite, they have the SCR's
shunted with
> a
> >resistor and capacitor in series. Shouldn't they be in parallel. The
reason
> >for my asking for help is that everything you think you would like
to try
> cost
> >50k. Everything is water cooled, resistors, capacitors even the
conductors
> in
> >the unit. So, anybody out there with any experience in this area
out
> there?
> >
> >Thanks for the help!
> >
> >73, Mike
> >KF8OD
> >
> >Long live QRO!
> >
> >--
> >FAQ on WWW: http://www.contesting.com/ampfaq.html
> >Submissions: amps@contesting.com
> >Administrative requests: amps-REQUEST@contesting.com
> >Problems: owner-amps@contesting.com
> >Search: http://www.contesting.com/km9p/search.htm
> >
>
>
> --
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