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1. AU1993046727 - A method for measuring the electric quantities of an AC electric-arc furnace

Office Australie
Numéro de la demande 46727/93
Date de la demande 23.02.1993
Numéro de publication 1993046727
Date de publication 17.11.1994
Type de publication A
CIB
H05B 7/144
HÉLECTRICITÉ
05TECHNIQUES ÉLECTRIQUES NON PRÉVUES AILLEURS
BCHAUFFAGE ÉLECTRIQUE; ÉCLAIRAGE ÉLECTRIQUE NON PRÉVU AILLEURS
7Chauffage par décharge électrique
02Détails
144Sources de puissance spécialement adaptées pour le chauffage par décharge électrique; Commande automatique de la puissance, p.ex. en commandant la position des électrodes
CPC
H05B 7/144
HELECTRICITY
05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
7Heating by electric discharge
02Details
144Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
Y02P 10/25
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
10Technologies related to metal processing
25Process efficiency
Déposants Toivonen, Lassi
Inventeurs Toivonen, Lassi
Données relatives à la priorité 920820 25.02.1992 FI
Titre
(EN) A method for measuring the electric quantities of an AC electric-arc furnace
Abrégé
(EN)
This invention relates to a method for measuring the electrode-related electric quantities of an AC electric-arc furnace. The method is based on observing the mutual corrrelation between electrode currents and total power supplied into a furnace by utilizing the fast, natural fluctuation of currents and power supplied into a furnace, and on estimation obervations. The information required in estimation is collected by performing a plurality of successive current and voltage measurements at adjacent instants and at various energy distributions of a furnace. The measurement results are used to calculably determine the estimates for electrode-related voltages, impedances and powers. It is further possible to split the electrode-related powers and voltages on the one hand in the electric-arc power and voltage and on the other hand in the power and voltage loss caused by resistive conduction. The effect of mutual impedances is automatically taken into account in estimation. If desired, the estimation can be performed independently at those frequencies, i.e., at the power system fundamental frequency and at harmonic and interharmonic frequencies which experience a significant transfer of energy. The method is useful in measuring both a furnace with neutral power connection and a furnace without neutral power connection. The measurements can be performed in the primary or secondary of the furnace transformer.

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