Abstract: Adapter device for composite electrodes having an auxiliary reactance function on electric arc furnaces, the furnace being able to be of a type fed with direct current or alternating current and comprising at least one secondary supply circuit which connects a transformer (13) to one or more electrode-holder arms (16), the adapter comprising a hollow cylindrical metallic body (21) associated with the relative electrode-holder arm (16) and directed towards the inside of the furnace, the metallic body (21) being connected at its lower end to a graphite segment (24), directed towards the bath of molten metal, at least part of the the adapter (20) including a conductive portion (30) which is made of a highly conductive material and is solidly associated with the metallic body (21) and is dimensioned according to the desired value of overall reactance of the secondary circuit of the furnace.

Abstract: System for connection of pneumatic and/or hydraulic hoses (11) on composite electrodes (12) for arc furnaces, the electrodes (12) comprising, at least one hollow adapter (13) associated at their lower part with a replaceable graphite element (14), the electrode (12) cooperating with an electrode-holder arm (15) and being displaceable axially in relation to that electrode-holder arm (15), the hoses (11) being associated at one end with a first connection assembly (18a) associated with a support (17), the adapter (13) including a solidly attached second connection assembly (18b) mating functionally with the first connection assembly (18a), the first (18a) and second (18b) connection assemblies comprising mating connecting elements (19a, 19b) equipped with elements to interrupt the flow of the fluid which can be temporally actuated, the a support (17) associated with the first connection assembly (18a) having a first inactive position temporally solid with the electrode-holder arm (15) and a second working posit

Abstract: A secondary circuit having a variable impedance for electric arc furnaces of a type working with alternating current, which is associated with a transformer (11) is disclosed. A secondary circuit comprises at least one rigid connection (12) connected to the outputs (16) of the transformer (11), flexible cables (13) connected through rigid connection elements (29, 129) at first end to the rigid connection (12) and at the other end to specific electrodes (15). At least one branch of the secondary circuit (10) corresponds to a specific phase including at least one of the respective rigid components (12, 17, 29, 129) having at least two parts reciprocally positionable in an adjustable manner according to the required value of overall reactance of the specific branch of the secondary circuit (10) comprising that rigid component (12, 17, 29, 129).