Title: Method and device for supplying electric arc melting furnace with current
Application Number: 00806646 Application Date: 2000.04.20
Publication Number: 1354968 Publication Date: 2002.06.19
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02J3/18;H02M7/162;H05B7/11;H05B7/144
Applicant(s) Name: SMS Demag AG Address:
Inventor(s) Name: Dirk Breker;Bernhard Espendiller;Guido Grund
Attorney & Agent: li deshan
Abstract:
    The invention relates to a method and to a device for supplying an electric arc melting furnace with current. Said melting furnace is used to melt and heat metal, especially steel. The inventive device comprises a three-phase current source that supplies the current via means for generating a direct current or an alternating current to at least one electrode that projects into the melting ladle of the melting furnace. At least two parallel current supply modules(41, 4n)are mounted downstream of said three-phase current source(91). Every current supply module(41, 4n)has an uncontrolled three-phase bridge(51, 5n), a direct current intermediate circuit(61, 6n)and a transistor element(71, 7n)connected in series. A common current supply(31)to at least one electrode(21)of the melting furnace(11)and from at least one further electrode(22 or 24)is provided downstream of the current supply modules(41, 4n)in the current direction.
Time: 11