Method and device for measuring the instability of an arc in an electric furnace for the processing (treatment) of liquid metal, fed with direct current

According to this method and this device, a signal is picked up which represents the voltage at the terminals of the arc, the signal is forwarded simultaneously into two band-pass filters (6, 7) which have, respectively, a wide high-frequency band (6) excluding the DC component and a wide band (7) i...

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Bibliographische Detailangaben
Hauptverfasser:	NGLER GILBERT, MAURER GHISLAIN
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS CONTROLLING ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY METALLURGY OF IRON PHYSICS PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL REGULATING SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Beschreibung
Zusammenfassung:	According to this method and this device, a signal is picked up which represents the voltage at the terminals of the arc, the signal is forwarded simultaneously into two band-pass filters (6, 7) which have, respectively, a wide high-frequency band (6) excluding the DC component and a wide band (7) including the DC component, the signals coming from the filters (6, 7) are sent to effective-value extractors (8, 9), an energy signal, proportional to the ratio of the effective value of the signal coming from the wide-band filter (6) excluding the DC component to the effective value of the signal coming from the wide-band filter (7) including the DC component, is generated by means of a divider module (11), and the proportional energy signal, obtained on a scale (12) where it is expressed as a percentage, is displayed, this percentage being indicative of the stability of the arc, significant of the smelting phase. The signal supplied by the display member (12) enables the furnace to be adjusted in real time by the control operator. Selon ce procédé et ce dispositif on capte un signal représentant la tension aux bornes de l'arc, on achemine le signal simultanément dans deux filtres passe-bande (6,7) respectivement à bande large haute fréquence excluant la composante continue (6) et à bande large incluant la composante continue (7), on transmet les signaux issus des filtres (6,7) à des extracteurs (8,9) de valeur efficace, on élabore au moyen d'un module diviseur (11) un signal énergétique proportionnel au rapport de la valeur efficace du signal issu du filtre à bande large excluant la composante continue (6) et de la valeur efficace du signal issu du filtre à bande large incluant la composante continue (7), et on affiche le signal énergétique proportionnel obtenu sur une échelle (12) où il est exprimé en pourcentage, ce pourcentage étant indicatif de la tenue de l'arc, significatif de la phase d'élaboration. Le signal fourni par l'organe d'affichage (12) permet de régler le four en temps réel par l'opérateur de contrôle.