Power supply for a three-phase plasma heating unit

Details Power supply for a three-phase plasma heating unit Power supply for a three-phase plasma heating unit

1987-09-23

1989-04-04

Paschall, M. H.

Electric heating

Metal heating

By arc

21912136, 2191301, 323355, B23K 900

Patent

active

048188360

ABSTRACT:
A power supply for a three-phase plasma heating unit includes a three-phase transformer having a primary winding group with taps which are switched under load. The transformer also has secondary winding groups which are offset by a 60.degree. phase angle, the secondary winding groups being connected to the three-phase plasma heating unit. Converter units are also connected to the secondary winding groups. Each converter unit includes a three-phase thyristor bridge and a choke connected to the bridge. Another embodiment employs two three-phase transformers. The first transformer has a secondary winding group with taps which are switched under load. The second transformer has a primary winding group which is connected to the secondary winding group of the first transformer. The second transformer also has secondary winding groups which are offset by a 60.degree. phase angle, the secondary winding groups being connected to the three-phase plasma heating unit. Converter units, each including a three-phase thyristor bridge and a choke, are connected to the secondary winding groups.

REFERENCES:
patent: 3555234 (1971-01-01), Lepp et al.
patent: 3917992 (1975-11-01), Volkov et al.
Karl-Heinz Eichler, "Stromversorgung fur Drehstrom-Plasmabrenner," May 1985 (2 pages, 114 and 117).
"Stromrichteranlagen der Starkstrom-technik"; Springer-Verlag.

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