Power supply system for a polyphase arc furnace with an...

H - Electricity – 05 – B

Patent

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Details

H05B 7/00 (2006.01) H05B 7/144 (2006.01)

Patent

CA 2738729

The invention relates to a power supply system for a three-phase arc furnace (1), comprising at least one furnace transformer (4). The furnace transformer (4) is connected on the secondary side to the three-phase arc furnace (1). On the primary side, the furnace transformer (4) is connected to a three-phase supply mains (3) through an indirect converter (5). The indirect converter (5) comprises at least one rectifier (6) on the mains side, at least one inverter (7) on the transformer side, and an intermediate circuit (8) between the rectifier (6) and the inverter (7). Each phase of the three-phase supply mains (3) is connected to the intermediate circuit (8) through two converter elements (11) of the rectifier (6) in each case. Each primary-side phase of the furnace transformer (4) is connected to the intermediate circuit (8) through two converter elements (12) of the inverter (7) in each case.

L'invention concerne une installation d'alimentation électrique pour un four à arc électrique triphasé (1) comprenant au moins un transformateur de four (4). Le transformateur de four (4) est raccordé côté secondaire au four à arc électrique triphasé (1). Côté primaire, le transformateur de four (4) est raccordé à un réseau triphasé d'alimentation (3) via un convertisseur indirect (5). Le convertisseur indirect (5) possède côté réseau au moins un redresseur (6), côté transformateur au moins un onduleur (7) et, entre le redresseur (6) et l'onduleur (7), un circuit intermédiaire (8). Chacune des phases du réseau triphasé d'alimentation (3) est reliée par deux éléments convertisseurs (11) du redresseur (6) au circuit intermédiaire (8). Chaque phase primaire du transformateur de four (4) est reliée au circuit intermédiaire (8) par deux éléments convertisseurs (12) de l'onduleur (7).

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