Power control system for ac electric arc furnace

H - Electricity – 05 – B

Patent

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H05B 7/148 (2006.01)

Patent

CA 2440464

A power control system for an AC electric arc furnace. The control system includes variable reactors located intermediate a furnace power supply and arc electrodes that are height adjustable. The control system monitors operating characteristics of the furnace that are indicative of the active power consumption of the furnace and adjusts the variable reactors and the electrode height so as to minimize variations in the active power consumption. Loss of electrode arc can be predicted and countered by lowering the electrodes and decreasing the reactance of the variable reactors. Image

La présente invention concerne un système de commande de puissance destiné à un four à arc électrique à courant alternatif. Le système de commande comprend des réactances variables disposées entre une alimentation électrique de four et des électrodes à arc qui sont réglables en hauteur. Le système de commande surveille les caractéristiques de fonctionnement du four, qui sont représentatives de la consommation en puissance active du four, et ajuste les réactances variables et la hauteur des électrodes de manière à minimiser les variations de la consommation de puissance active. La perte d'arc d'électrode peut être prévue et évitée grâce à l'abaissement des électrodes et à la diminution de la valeur des réactances variables.

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