Patent · US Expired

Method and device for supplying an electric arc melting furnace with current

US6421366B1 · kind B1 · utility

7Cited by

5References

14Claims

0Family size

Assignee

SMS DEMAG LLC · DE

Inventors

Dirk Breker · Selm, DE
Bernhard Espendiller · Dülmen, DE
Guido GRUND · Dorsten, DE
Klaus Schmale · Krefeld, DE

Key dates

Filing date	Nov 21, 2001
Grant date	Jul 16, 2002
Priority date	—
Expiry date	Nov 21, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/25
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention pertains to a process and to a device for supplying current to an electric-arc melting unit for melting and heating metal, especially steel, with a three-phase a.c. source, which sends the current via devices for producing direct current or alternating current to at least one electrode projecting into the vessel of the melting unit. The three-phase a.c. source (91) is followed by at least two power supply modules (41, 4n), connected in parallel, where each power supply module (41; 4n) has an uncontrolled three-phase bridge (51, 5n), a direct-current intermediate circuit (61, 6n), and a transistor unit (71, 7n) connected in series, and where, downline from the power supply modules (41, 4n) in the current flow direction, a common current-carrying line (31) leads to at least one electrode (21) of the melting unit (11) and away from at least one other electrode (22, 24).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.