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RE: phase shifter instead of variac use

Original poster: Dieter.Boeckeler@xxxxxxxxxxx ( =?iso-8859-1?Q?"Dieter_Böckeler"?
Hi Black Moon,Coilers,
in the systems we use these phase shifters we sometimes have shorted secondary windings.
One example:
The welding of railways with very high current.
in a locomotive is a 800HP diesel engine.The engine drives a generator.
The generator produces 400V 1000A.After the generator is the phase shifter circuit to
regulate the 400V/1000A.After the phase shifter there is a transformer on a crane out of the
locomotive.The secondary of this transformer are the two railways which should be welded.
The current in the railways if put together is 16ka/~20V.
The most use for such primary shifters is for galvano systems.
best regards

"Tesla list" <tesla@xxxxxxxxxx> schrieb:
> Original poster: "Black Moon" <black_moons@xxxxxxxxxxx>
> I think the problem comes from the fact a triac is either full on or off,
> and you need actual current limiting to prevent the pig from looking like a
> near dead short when the secondary arcs
> >From: "Tesla list" <tesla@xxxxxxxxxx>,")"@pupman.com (by way of Terry
> >Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>)
> >To: tesla@xxxxxxxxxx
> >Subject: phase shifter instead of variac use
> >Date: Tue, 04 Jan 2005 15:32:14 -0700
> >
> >Original poster: Dieter.Boeckeler@xxxxxxxxxxx (
> >=?iso-8859-1?Q?"Dieter_Böckeler"?
> >Hi all,
> >an idea:
> >is it possible to use a big phase shifter with current regulator for
> >teslacoils.
> >for example:
> >A semiconductor module with two thyristors (called powerblock)
> >in a W1C circuit.Such powerblocks can easily handle a lot of current
> >(eupec TT95N12=95A 1200V).The moduls with cooling and
> >R-C-safety circuit are very compact and the unit with controller weight a
> >lot less! than a variac with 95A.
> >O.k.I don´t need 95A but these modules are the smallest available for
> >me.(no cost)
> >In the company I work we use those circuits like
> >W1C (1-phase primary shifter),W3C(3-phase primary shifter)
> >to regulate the primary current of high current transformers.
> >best regards
> >alex
> >