Process and device for supplying current to an electric-arc...

H - Electricity – 05 – B

Patent

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Details

H05B 7/144 (2006.01) F27B 3/08 (2006.01) F27B 3/28 (2006.01) H02J 3/18 (2006.01) H02J 3/38 (2006.01) H02M 5/458 (2006.01) H02M 7/162 (2006.01) H05B 7/00 (2006.01) H05B 7/11 (2006.01)

Patent

CA 2371094

The invention relates to a method and to a device for supplying an electric arc melting furnace with current. Said melting furnace is used to melt and heat metal, especially steel. The inventive device comprises a three-phase current source that supplies the current via means for generating a direct current or an alternating current to at least one electrode that projects into the melting ladle of the melting furnace. At least two parallel current supply modules (41, 4n) are mounted downstream of said three-phase current source (91). Every current supply module (41, 4n) has an uncontrolled three-phase bridge (51, 5n), a direct current intermediate circuit (61, 6n) and a transistor element (71, 7n) connected in series. A common current supply (31) to at least one electrode (21) of the melting furnace (11) and from at least one further electrode (22 or 24) is provided downstream of the current supply modules (41, 4n) in the current direction.

La présente invention concerne un procédé et un dispositif pour alimenter en courant une unité de fusion à arc électrique, utilisée pour fondre et chauffer du métal, notamment de l'acier. Ledit dispositif comprend une source de courant triphasé qui fournit le courant au moyen de systèmes produisant un courant continu ou un courant alternatif sur au moins une électrode pénétrant dans le récipient de l'unité de fusion. Au moins deux modules d'alimentation en courant parallèles (41, 4n) sont connectés en aval de ladite source de courant triphasé (91). Chaque module d'alimentation en courant (41, 4n) présente un pont triphasé non commandé (51, 5n), un circuit intermédiaire à courant continu (61, 6n) et une unité transistor (71, 7n), montés en série. Un élément d'alimentation en courant commun (31), situé en aval des modules d'alimentation en courant (41, 4n), dans la direction du courant, est relié à au moins une électrode (21) de l'unité de fusion (11) et se trouve à distance d'au moins une autre électrode (22 ou 24).

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