EP0080954A1 - Connection and support arrangement for the electrodes of an arc furnace - Google Patents

Connection and support arrangement for the electrodes of an arc furnace Download PDF

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Publication number
EP0080954A1
EP0080954A1 EP82402192A EP82402192A EP0080954A1 EP 0080954 A1 EP0080954 A1 EP 0080954A1 EP 82402192 A EP82402192 A EP 82402192A EP 82402192 A EP82402192 A EP 82402192A EP 0080954 A1 EP0080954 A1 EP 0080954A1
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EP
European Patent Office
Prior art keywords
electrodes
supply
arc furnace
current
cables
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82402192A
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German (de)
French (fr)
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EP0080954B1 (en
Inventor
Jean Davene
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Clecim SAS
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Clecim SAS
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Application filed by Clecim SAS filed Critical Clecim SAS
Priority to AT82402192T priority Critical patent/ATE19335T1/en
Publication of EP0080954A1 publication Critical patent/EP0080954A1/en
Application granted granted Critical
Publication of EP0080954B1 publication Critical patent/EP0080954B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/103—Mountings, supports or terminals with jaws

Definitions

  • the present invention relates to a device for supplying electrical energy and for mechanically supporting the electrodes, an electric arc furnace intended to equip a steelworks.
  • the device according to the invention allows a simpler manufacture than for these known devices, as well as a reduction in the electrical reactance of this part of the oven, which makes it possible to have, for the same power drawn from the network, a significant increase. of the power of the arcs.
  • It is characterized in that it is equipped with non-magnetic metal electrode-carrying arms, the upstream end of which serves as a contact area for the current supply cables.
  • the metal used is stainless steel.
  • the brar are constructed so as to present, on the current path, no sharp angle as well in their section as in their length.
  • each of the three vertical masts (1,2,3) carries, in a conventional manner, a wider support piece (4,5,6), provided with a part electrically insulating 7.
  • each support piece (4,5,6) carries a horizontal arm (8,9,10) made of stainless steel, the upstream end (11,12) of which serves as a contact pad for the cables 13 for supplying the current, and the downstream end of which is attached to the clamps (14, 15, 16) intended to grip the electrodes.
  • the arms (8, 9, 10) are constructed so as to present, on the path of the current, no sharp angle. Their section is circular and they are, in the direction of the length, either completely rectilinear, or presenting curves in S.
  • Figure 1 shows one of the two arms, such as arm 8, which is not framed by the other two.
  • arm 8 is rectilinear and its support member (1,4) arrives at the lower part of the associated clamp 14.
  • Figure 2 shows the "central" arm 9, which is framed by the other two (8,10, Figure 3).
  • its support member (2,5) arrives, in a conventional manner, at a level situated above that of the lower part of the associated clamp 15.
  • the mast 2 is therefore more. higher than the other two.
  • the three clamps (14,15,16) being preferably at the same level, the arm 9 has a soft curvature, S-shaped as shown, so that its downstream part is at the same level as the others.
  • non-magnetic metal is essential because these metals have a "skin effect" much less than that presented by non-magnetic metals, such than ordinary steel, for example.
  • the "Kelvin skin” is in fact about thirty times thicker for stainless steel than for ordinary steel.
  • stainless steel leads to dimensions of electrode holder arms which are especially well suited to the desired layouts for electric ovens; this metall is therefore preferred for carrying out the invention.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Physical Vapour Deposition (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

1. Arrangement for the supply of electrical energy to and for the support of the electrodes in an electric arc furnace comprising three electrodes fixed respectively in grips (14, 15, 16) placed at the respective ends of three support arms (8, 9, 10) extending horizontally from a vertical pillar, the said electrodes being connected by rigid electrical conductors to cables (13) for the supply of current, characterized in that the rigid conductors for the supply of electricity to the electrodes are constituted by the same horizontal support arms (8, 9, 10), the latter being constructed of non-magnetic metal and being provided, at their downstream ends opposite to the electrodes, with respective contact elements (11, 12) to which the cables (13) for the supply of current are connected.

Description

La présente invention est relative à un dispositif d'ali- nentation en énergie électrique et de support mécanique des électrodes l'un four électrique à arcs destiné à équiper une aciérie.The present invention relates to a device for supplying electrical energy and for mechanically supporting the electrodes, an electric arc furnace intended to equip a steelworks.

Dans un four électrique de fusion à arcs, le courant électrique est conduit du transformateur de four aux électrodes par des cà- bles souples et des conducteurs rigides en cuivre. Ces conducteurs sont en général refroidis et sont supportés par la partie horizontale, ou aras, de chaque porte-électrode. Chacun de ces bras est construit en acier ordinaire et a une section carrée ou rectangulaire. La construction des conducteurs est assez complexe dans son tracé, son isolation électrique et son mode de support. Les conducteurs de chaque phase sont disposés de façon à réduire et équilibrer leurs caractéristiques électriques que sont les réactances et résistances.In an electric arc melting furnace, electric current is passed from the furnace transformer to the electrodes by flexible cables and rigid copper conductors. These conductors are generally cooled and are supported by the horizontal part, or macaws, of each electrode holder. Each of these arms is made of ordinary steel and has a square or rectangular section. The construction of the conductors is quite complex in its layout, its electrical insulation and its mode of support. The conductors of each phase are arranged so as to reduce and balance their electrical characteristics, which are reactances and resistances.

Dans ces dispositifs connus, les fonctions de support(bras) et de conducteur électrique(tubes en cuivre) sont toujours séparées.Pour l'homme de métier en effet, la conduction électrique de courants très intenses se fait toujours par l'intermédiaire de tubes en cuivre, en raison de la basse résistivité de ce métal. Par contre le cuivre, en raison de ses propriétés mécaniques insuffisantes avec les diamètres souhaités pour avoir une implantation satisfaisante, n'est pas utilisé pour la construction des bras porte-électrode.In these known devices, the support (arm) and electrical conductor (copper tubes) functions are always separate. For those skilled in the art, the electrical conduction of very intense currents is always done by means of tubes. in copper, due to the low resistivity of this metal. On the other hand, copper, because of its insufficient mechanical properties with the desired diameters to have a satisfactory implantation, is not used for the construction of the electrode-carrying arms.

Le dispositif selon l'invention permet une fabrication plus simple que pour ces dispositifs connus, ainsi qu'une réduction de la réactance électrique de cette partie du four, ce qui permet d'avoir, pour une même puissance appelée au réseau, une augmentation sensible de la puissance des arcs. Il est caractérisé en ce qu'il est équipé de bras porte-électrode en métal amagnétique, dont l'extrémité amont sert de plage de contact aux cables d'amenée du courant. Préférentiellement, le métal utilisé est l'acier inoxydable.Préférentiellement également, les brar sont construits de manière à ne présenter, sur le trajet du courant, aucun angle vif aussi bien dans leur section que sur leur longueur.The device according to the invention allows a simpler manufacture than for these known devices, as well as a reduction in the electrical reactance of this part of the oven, which makes it possible to have, for the same power drawn from the network, a significant increase. of the power of the arcs. It is characterized in that it is equipped with non-magnetic metal electrode-carrying arms, the upstream end of which serves as a contact area for the current supply cables. Preferably, the metal used is stainless steel. Preferably also, the brar are constructed so as to present, on the current path, no sharp angle as well in their section as in their length.

L'invention sera mieux comprise à l'aide de la description suivante d'un exemple préférentiel de réalisation, en référence aux dessins annexés dans lesquels :

  • - la figure 1 est une vue latérale schématique d'un des bras porte-électrode qui n'est pas encadré par les deux autres
  • - la figure 2 est une vue latérale schématique du bras porte-électrode qui se trouve encadré par les deux autres
  • - la figure 3 est une vue schématique de dessus du dispositif de l'invention.
The invention will be better understood using the following description of a preferred embodiment, with reference to the accompanying drawings in which:
  • - Figure 1 is a schematic side view of one of the electrode holder arms which is not framed by the other two
  • - Figure 2 is a schematic side view of the electrode holder arm which is framed by the other two
  • - Figure 3 is a schematic top view of the device of the invention.

En se reportant à l'ensemble des figures 1 à 3, chacun des trois mâts verticaux(1,2,3) porte, de manière classique, une pièce de support (4,5,6) plus large, munie d'une partie électriquement isolante 7.Referring to all of FIGS. 1 to 3, each of the three vertical masts (1,2,3) carries, in a conventional manner, a wider support piece (4,5,6), provided with a part electrically insulating 7.

Conformément à l'invention, chaque pièce-support(4,5,6) porte un bras horizontal (8,9,10) en acier inoxydable, dont l'extrémité amont (11,12) sert de plage de contact pour les cables 13 d'amenée du courant, et dont l'extrémité aval est rattachée aux pinces(14,15,16) destinées à enserrer les électrodes.According to the invention, each support piece (4,5,6) carries a horizontal arm (8,9,10) made of stainless steel, the upstream end (11,12) of which serves as a contact pad for the cables 13 for supplying the current, and the downstream end of which is attached to the clamps (14, 15, 16) intended to grip the electrodes.

Afin d'éviter les phénomènes d'échauffement qui seraient dus à des accumulations de courant, les bras(8,9,10) sont construits de manière à ne présenter, sur le trajet du courant, aucun angle vif. Leur section est circulaire et ils sont, dans le sens de la longueur, soit totalement rectilignes, soit présentant des courbures en S.In order to avoid the phenomena of heating which would be due to accumulations of current, the arms (8, 9, 10) are constructed so as to present, on the path of the current, no sharp angle. Their section is circular and they are, in the direction of the length, either completely rectilinear, or presenting curves in S.

La figure 1 représente un des deux bras, tel que le bras 8, qui n'est pas encadré par les deux autres. Un tel bras est rectiligne et son organe de support(1,4) arrive au niveau de la partie inférieure de la pince associée 14.Figure 1 shows one of the two arms, such as arm 8, which is not framed by the other two. Such an arm is rectilinear and its support member (1,4) arrives at the lower part of the associated clamp 14.

La figure 2 représente le bras"central" 9, qui se trouve encadré par les deux autres (8,10,figure 3). Pour des raisons évidentes d'encombrement, son organe de support(2,5) arrive, de manière classique, à un niveau situé au-dessus de celui de la partie inférieure de la pince associée 15. Le mât 2 est donc plus. haut que les deux autres. Les trois pinces(14,15,16) étant préférentiellement au même niveau, le bras 9 présente une courbure douce, en forme de S comme représenté, de sorte que sa partie aval soit au même niveau que les autres.Figure 2 shows the "central" arm 9, which is framed by the other two (8,10, Figure 3). For obvious reasons of space, its support member (2,5) arrives, in a conventional manner, at a level situated above that of the lower part of the associated clamp 15. The mast 2 is therefore more. higher than the other two. The three clamps (14,15,16) being preferably at the same level, the arm 9 has a soft curvature, S-shaped as shown, so that its downstream part is at the same level as the others.

Pour la réalisation de l'invention, l'utilisation d'un métal amagnétique est indispensable car ces métaux présentent un "effet de peau" bien moindre que celui présenté par les métaux amagnétiques, tel que l'acier ordinaire par exemple.. La"peau de Kelvin" est en effet en- viron trente fois plus épaisse pour l'acier inoxydable que pour l'a-:ier ordinaire. Par ailleurs, l'acier inoxydable conduit à des dimen- ions de bras porte-électrode qui se trouvent spécialement bien adap- tées aux implantations souhaitées pour les fours électriques; ce mé- :al s'avère donc préférentiel pour la réalisation de l'invention.For the realization of the invention, the use of a non-magnetic metal is essential because these metals have a "skin effect" much less than that presented by non-magnetic metals, such than ordinary steel, for example. The "Kelvin skin" is in fact about thirty times thicker for stainless steel than for ordinary steel. In addition, stainless steel leads to dimensions of electrode holder arms which are especially well suited to the desired layouts for electric ovens; this metall is therefore preferred for carrying out the invention.

Claims (3)

1. Dispositif d'alimentation en énergie électrique et de support mécanique d'un four électrique à arcs,du type selon lequel chaque électrode est supportée par l'intermédiaire d'un bras horizontal(8,9,10), caractérisé en ce qu'il est équipé de bras porte-électrode(8,9,10) en métal amagnétique, dont l'extrémité amont(11,12) sert de plage de contact aux câbles(133 d'amenée du courant.1. Device for supplying electrical energy and mechanical support for an electric arc furnace, of the type in which each electrode is supported by means of a horizontal arm (8, 9, 10), characterized in that 'it is equipped with non-magnetic metal electrode-carrying arms (8,9,10), the upstream end (11,12) of which serves as a contact area for the cables (133 for supplying current. 2. Dispositif d'alimentation et de support selon la revendication 1, caractérisée en ce que lesdits bras sont construits de manière à ne présenter, sur le trajet du courant, aucun angle vif aussi bien dans leur section que sur leur longueur.2. Supply and support device according to claim 1, characterized in that said arms are constructed so as to present, on the current path, no sharp angle as well in their section as in their length. 3. Dispositif d'alimentation et de support selon la revendication 1 ou la revendication 2, caractérisé en ce que ledit métal amagnétique est de l'acier inoxydable.3. Supply and support device according to claim 1 or claim 2, characterized in that said non-magnetic metal is stainless steel.
EP82402192A 1981-12-01 1982-12-01 Connection and support arrangement for the electrodes of an arc furnace Expired EP0080954B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82402192T ATE19335T1 (en) 1981-12-01 1982-12-01 CONNECTION AND CARRYING DEVICE FOR THE ELECTRODES OF AN ARC FURNACE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8122521 1981-12-01
FR8122521A FR2517502A1 (en) 1981-12-01 1981-12-01 ELECTRODE SUPPLYING AND SUPPORTING DEVICE FOR ARC OVEN

Publications (2)

Publication Number Publication Date
EP0080954A1 true EP0080954A1 (en) 1983-06-08
EP0080954B1 EP0080954B1 (en) 1986-04-16

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ID=9264562

Family Applications (1)

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EP82402192A Expired EP0080954B1 (en) 1981-12-01 1982-12-01 Connection and support arrangement for the electrodes of an arc furnace

Country Status (6)

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EP (1) EP0080954B1 (en)
JP (1) JPS58161293A (en)
AT (1) ATE19335T1 (en)
DE (1) DE3270677D1 (en)
ES (1) ES276272Y (en)
FR (1) FR2517502A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563404A1 (en) * 1984-04-19 1985-10-25 Stein Heurtey Support arm for ladle furnace electrode
EP0184140A2 (en) * 1984-11-29 1986-06-11 Fuchs Systemtechnik GmbH Arc furnace
US4742529A (en) * 1986-01-23 1988-05-03 C. Conradty Nurnberg Gmbh & Co. Kg Three-phase arc furnace
EP0594272A1 (en) * 1992-10-20 1994-04-27 MANNESMANN Aktiengesellschaft Electrode supporting arm for an electric arc furnace
DE102014208516A1 (en) 2014-05-07 2015-11-12 Sms Group Gmbh Apparatus for supporting an electrode arm of a high current supply to a metallurgical furnace
FR3045268A1 (en) * 2015-04-01 2017-06-16 Clesid Lorber CONDUCTIVE ARM IN AMAGNETIC STEEL REINFORCED BY LOW RESISTIVITY MATERIAL

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2543642Y2 (en) * 1992-10-20 1997-08-13 株式会社ニッコー Electrode support equipment for electric furnaces

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR783511A (en) * 1934-03-21 1935-07-15 Electrode suspension system and method for special alloy electric furnaces
FR848766A (en) * 1938-02-14 1939-11-07 Umbra Prodotti Chimici Soc Electrode holder for electric furnaces, in particular for the production of carbon disulphide
US3395238A (en) * 1965-05-17 1968-07-30 Northwestern Steel & Wire Comp Power coupling and electrode arrangement for electric furnace
US3433878A (en) * 1965-06-10 1969-03-18 Asea Ab Line transmission in arc furnaces
FR1569521A (en) * 1967-06-06 1969-05-30

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494775A (en) 1946-01-31 1950-01-17 Delaware Engineering Corp Arc electrode support
JPS5150686Y2 (en) * 1973-06-13 1976-12-06

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR783511A (en) * 1934-03-21 1935-07-15 Electrode suspension system and method for special alloy electric furnaces
FR848766A (en) * 1938-02-14 1939-11-07 Umbra Prodotti Chimici Soc Electrode holder for electric furnaces, in particular for the production of carbon disulphide
US3395238A (en) * 1965-05-17 1968-07-30 Northwestern Steel & Wire Comp Power coupling and electrode arrangement for electric furnace
US3433878A (en) * 1965-06-10 1969-03-18 Asea Ab Line transmission in arc furnaces
FR1569521A (en) * 1967-06-06 1969-05-30

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563404A1 (en) * 1984-04-19 1985-10-25 Stein Heurtey Support arm for ladle furnace electrode
EP0184140A2 (en) * 1984-11-29 1986-06-11 Fuchs Systemtechnik GmbH Arc furnace
EP0184140A3 (en) * 1984-11-29 1987-04-08 Fuchs Systemtechnik Gmbh Arc furnace
US4742529A (en) * 1986-01-23 1988-05-03 C. Conradty Nurnberg Gmbh & Co. Kg Three-phase arc furnace
EP0594272A1 (en) * 1992-10-20 1994-04-27 MANNESMANN Aktiengesellschaft Electrode supporting arm for an electric arc furnace
DE102014208516A1 (en) 2014-05-07 2015-11-12 Sms Group Gmbh Apparatus for supporting an electrode arm of a high current supply to a metallurgical furnace
FR3045268A1 (en) * 2015-04-01 2017-06-16 Clesid Lorber CONDUCTIVE ARM IN AMAGNETIC STEEL REINFORCED BY LOW RESISTIVITY MATERIAL

Also Published As

Publication number Publication date
DE3270677D1 (en) 1986-05-22
JPS58161293A (en) 1983-09-24
FR2517502A1 (en) 1983-06-03
ATE19335T1 (en) 1986-05-15
EP0080954B1 (en) 1986-04-16
FR2517502B1 (en) 1984-10-26
ES276272Y (en) 1984-12-01
ES276272U (en) 1984-04-16

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