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Re: Controling a Pole Pig
Tesla List wrote:
>
> Original Poster: Steve Rodway <Legion-at-legion-elec.demon.co.uk>
>
> I have dismantled a pig almost identical to viv's one, and because of
the
> way it is wound, it is not possible to put a shunt in the magnetic path,
the 2
> windings are layered over each other, so there is no way for any flux to
link
> only one of the coils which (I believe) is what is necessary for shunting to
> work.
> I do have a related question though, I have 2 pigs, and was wondering
if I
> could use one of them as a variable inductor by putting a variable gap in
the
> core and then putting the 240V side of both pigs in parallel, not connecting
> anything to the 11 kV side of the gapped pig. Does anyone have any
> experience of
> this, will it work?
>
YEs something like this will work... This is how inexpensive welders set
the current. They have a core with lots of extra room in the middle
(where the windings are. Then, they have a piece of core (the shunt)
which slides in and out, changing the leakage inductance, as you turn
the handle (which operates a lead screw or other mechanism). When the
shunting core is all the way out it is max current, all the way in is
minimum.
--
Jim Lux Jet Propulsion Laboratory
ofc: 818/354-2075 114-B16 Mail Stop 161-213
lab: 818/354-2954 161-110 4800 Oak Grove Drive
fax: 818/393-6875 Pasadena CA 91109