EP2084940B1 - Dispositif de prébranchement à réactance - Google Patents

Dispositif de prébranchement à réactance Download PDF

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Publication number
EP2084940B1
EP2084940B1 EP20070803116 EP07803116A EP2084940B1 EP 2084940 B1 EP2084940 B1 EP 2084940B1 EP 20070803116 EP20070803116 EP 20070803116 EP 07803116 A EP07803116 A EP 07803116A EP 2084940 B1 EP2084940 B1 EP 2084940B1
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EP
European Patent Office
Prior art keywords
reactance
switching element
ballast device
load
induction coil
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Active
Application number
EP20070803116
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German (de)
English (en)
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EP2084940A1 (fr
Inventor
Arno DÖBBELER
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Siemens AG
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Siemens AG
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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
    • H05B7/005—Electrical diagrams

Definitions

  • the invention relates to a Reaktanzvorschalt adopted for an electric arc furnace, in particular for adjusting the Rajreaktanz a transformer of the arc furnace.
  • An arc furnace as used for example for steel smelting, is usually preceded by a transformer which adjusts an alternating voltage required for the arc. Since very high power is consumed by an electric arc furnace and high alternating voltages must be transmitted by the upstream transformers, such transformers are usually incorporated in an insulating means in order to avoid flashovers.
  • An important parameter in AC and AC is the reactance, i. the reactance of a conductor, for example in a current-carrying coil.
  • the inductor used for this purpose has at least one tap, which taps the current flowing through the coil after a certain number of turns and thus assigns a defined reactance set to the transformer.
  • the tap is hardwired.
  • a change must be made if it is recognized after a long period of operation that the selected pre-reactance in load operation, i. in furnace operation, is not optimally set, which for example leads to an unnecessary increase in energy consumption, or that the reactance should be adjusted process-dependent.
  • a shutdown of the power supply thus shutting down the furnace system and the wiring of the transformer with another tap on the choke coil required.
  • a first object of the invention is to provide a device with which the particular upstream of a transformer reactance is easily adjustable.
  • a second object of the invention is to provide a transformer with which the reactance is adjusted as accurately as possible.
  • a third object of the invention is to provide an electric arc furnace, in particular for steel smelting, which is supplied optimally and economically with energy during load operation.
  • the first object is achieved in that a reactance ballast is specified, in particular for an electric arc furnace, with a choke coil and with a freestanding on-load tap-changer, wherein the on-load tap-changer designed and set to adjust the reactance of the choke coil under load.
  • the inventive combination of a choke coil with a freestanding on-load tap-changer makes it possible to adjust the pre-reactance under load, so that the optimal pre- or additional reactance can always be selected according to the operational requirements, in particular in application to the load operation of an electric arc furnace.
  • the reactance ballast is not limited to its use for adjusting the reactance for an electric arc furnace or for an arc furnace transformer. It can also be connected upstream of other energy consumers or plants whose characteristics are determined in particular by the reactance.
  • a freestanding dry-insulated air throttle coil is selected for the Reaktanzvorschalt issued.
  • dry-insulated air throttle coils no insulating oils are used, which reduces general maintenance and fire risk and thus increases efficiency and environmental friendliness.
  • the choke coil has a suitable number of tapping points, each of which is assigned a number of turns of the coil. Since the inductance, and hence the impedance of a coil, depends on the number of turns that a coil current passes through, by tapping off an alternating current passing through the coil at one tap, the coil impedance, and hence the reactance, i.e., the inductance. the reactance at AC, according to the gradations of the taps are given graded.
  • the free-standing on-load tap-changer combined with the choke coil has a number of input contacts, at least one output contact and a switching element.
  • the switching element for alternately variable connection of at least one input contact is set up with an output contact. With multiple input contacts, the switching element can thus each connect one or more input contacts to an output contact, depending on the configuration. The respective setting of the switching element thus controls the output on or at an output contact.
  • the on-load tap-changer further comprises a container with an insulating means, in which is designed and arranged for receiving the switching element. The insulating means a sparkover is avoided by high voltages. Due to the insulating properties of the insulating the spark gap is reduced, so that the overall size is reduced.
  • the switching element suitably has a number of inputs and at least one output, wherein one or each output is associated with a branching node, at least two branches of a bridge circuit converge, the branches are each deactivatable at switching points, the branches each variable with the inputs are connectable, and in pairs with each other via a cross connection to a load switching point are connected, in particular with a vacuum switch.
  • a bridge circuit comprises at least two branches.
  • the branches make contact with the inputs of the switching element, and can be contacted individually with different inputs, so that several branches abut an input, or only one branch in each case an input.
  • the variable contacting can be achieved by shifting the branches between different inputs. If all branches are at an entrance or all branches are contacted with this entrance, then a step position is given. If, on the other hand, two branches are resting against two different entrances, then a bridge position is created Are defined. With only two branches, there is only one step position and one bridge position. Such a trained switching element allows switching under load, wherein the switching takes place from one step position to another successively via the formation of bridge positions.
  • the branches of the bridge circuit of the switching element are connected in pairs with cross-connections, which can be deactivated via a respective load switching point. Between the branching node and the cross connections, the branches are in turn provided with switching points. If switching points on individual branches are now deactivated, for example to move these branches from one to another, the cross-connections connected to these branches initially take over the load and can also compensate for current and voltage fluctuations in the area of the branching node and overload there Prevent switching. Now the cross connections at the load switch points can be deactivated and the branches thus decoupled from the current flow can be shifted.
  • the load switching points are preferably given by vacuum switch, since vacuum switch as a load switch by the shielding effect of the vacuum function reliably and are wear.
  • the branches between the cross connections and the input-side contact points are suitably provided with throttle elements which ensure a substantially uniform load distribution in the circuit in a bridge configuration.
  • a desired embodiment of the Reaktanzvorschalt founded is designed to the effect that the number of tap locations of the choke coil coincides with the number of input contacts of the on-load tap-changer and each one tap point is connected to an input contact.
  • the assignment of the tapping points to the input contacts is preferably linear, so that a counting of the input contacts in a predetermined sequence corresponds to the increasing or decreasing reactance of the choke coil. It exists hereby a desired unique association between the reactance stages and the input contacts.
  • the second object is achieved by a transformer, in particular for an electric arc furnace, which is preceded by a Reaktanzvorschalt thanks according to the aforementioned type.
  • the third object is achieved by an electric arc furnace, in particular for the steel smelting, which is preceded by a transformer of the aforementioned type.
  • FIG. 1 is a Reaktanzvorschalt issued V with an air throttle coil 1 and a freestanding on-load tap-changer 2 shown in entirety.
  • the air throttle coil 1 is connected via the feed point 3 to a power grid and is provided with a number of uniformly distributed tapping points 4, via which the current passing through the air throttle coil 1 can each be tapped after a multiple of an equal section of the bobbin.
  • the air throttle coil 1 is introduced into a container 5, which is shown here by dashed lines.
  • the freestanding on-load tap-changer 2 has a steel housing 6, the interior 7 of which is filled with an insulating agent, in particular oil.
  • the on-load tap-changer 2 is provided with a number of input contacts 8, which are wired to the tapping points 4 of the air throttle coil 1.
  • the input contacts 8 represent inputs for a localized there switching element 9, which is here as a whole variably displaceable.
  • the output of the switching element 9 is passed through an output contact 10 to the outside and connected via a power line 11 to a transformer of an electric arc furnace.
  • FIG. 2 the switching process of a switching element 9 after FIG. 1 between a step and a bridge position in the switching phases A to F shown schematically.
  • the components of the switching element 9 are first explained in detail, which are given analogously for the remaining switching phases B to F.
  • the components of the switching element 9 only provided there with reference numerals, where it is necessary for the explanation of the switching process.
  • FIG. 2 illustrated switching element 9 is connected via the on-load tap-changer 2 with the tapping points 4 of the air throttle coil 1, as it is made FIG. 1 is apparent.
  • the switching element 9 has a left line branch or branch 131 and a right line branch 13r, which are each provided with choke coils 141, 14r, and are each connected via contact points 151, 15r with toggle switches 161, 16r to a branching node 17 ,
  • the junction node 17 leads to the output 21 of the switching element 9.
  • FIG. 3 shows an arc furnace 0 with a furnace transformer T and a reactance ballast V of the type mentioned with a choke coil 1 and an on-load tap 2.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
  • Control Of Electrical Variables (AREA)
  • Discharge Heating (AREA)

Claims (9)

  1. Dispositif (V) de ballast à réactance, notamment pour un four à arc électrique, comprenant une bobine ( 1 ) de self et un commutateur ( 2 ) de réglage en charge détaché, le commutateur ( 2 ) de réglage en charge étant constitué et conçu pour le réglage de la réactance de la bobine ( 1 ) de self en charge.
  2. Dispositif ( V ) de ballast à réactance suivant la revendication 1, dans lequel la bobine ( 1 ) de self est constituée sous la forme d'une bobine de self à air détachée et isolée à sec.
  3. Dispositif ( V ) de ballast à réactance suivant la revendication 1 ou 2, dans lequel la bobine ( 1 ) de self est pourvue d'un certain nombre de points ( 4 ) de prise, auquel est associé respectivement un nombre de spires de la bobine ( 1 ) de self.
  4. Dispositif ( V ) de ballast à réactance suivant l'une des revendications 1 à 3, dans lequel le commutateur ( 2 ) de réglage en charge comprend un certain nombre de contacts ( 8 ) d'entrée, au moins un contact ( 10 ) de sortie et un élément ( 9 ) de commutation, lequel élément ( 9 ) de commutation est conçu respectivement pour la liaison d'au moins un contact ( 4 ) d'entrée à un contact ( 10 ) de sortie, ainsi qu'un récipient ( 6 ) ayant un agent isolant, lequel récipient ( 6 ) est constitué et conçu pour la réception de l'élément ( 9 ) de commutation.
  5. Dispositif ( V ) de ballast à réactance suivant la revendication 4, dans lequel l'élément ( 9 ) de commutation a un certain nombre d'entrées ( 121, 12r ) et au moins une sortie ( 21 ), dans lequel il est associé, à une sortie ou à chaque sortie, un noeud ( 17 ) de dérivation, auquel concourent au moins deux branches ( 131, 13r ) d'un circuit en pont, les branches ( 131, 13r ) pouvant être désactivées respectivement en des points ( 151, 15r ) de commutation, les branches ( 131, 13r ) pouvant être reliées de manière variable respectivement aux entrées ( 121, 12r ) et étant reliées respectivement paire par paire entre elles par une liaison ( 18 ) transversale à un point ( 20 ) de commutation en charge, notamment à un interrupteur à vide.
  6. Dispositif ( V ) de ballast à réactance suivant la revendication 3 et suivant l'une des revendications 4 ou 5, dans lequel le nombre des points ( 4 ) de prise de la bobine ( 1 ) de self coïncide avec le nombre des contacts ( 8 ) d'entrée du commutateur ( 2 ) de réglage en charge et respectivement un point ( 4 ) de prise est relié à un contact ( 8 ) d'entrée.
  7. Dispositif ( V ) de ballast à réactance suivant la revendication 6, dans lequel les contacts ( 8 ) d'entrée et les contacts ( 10 ) de sortie du commutateur de réglage en charge sont associés, de manière univoque, respectivement aux entrées ( 121, 12r ) et aux sorties ( A ) de l'élément de commutation.
  8. Transformateur ( T ), notamment pour un four ( 0 ) à arc électrique, en amont duquel est branché un dispositif ( V ) de ballast à réactance suivant l'une des revendications précédentes pour un réglage préalable de réactance.
  9. Four ( 0 ) à arc électrique, notamment pour la fusion de l'acier, en amont duquel est branché un transformateur ( T ) suivant la revendication 8.
EP20070803116 2006-10-26 2007-08-31 Dispositif de prébranchement à réactance Active EP2084940B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006050624A DE102006050624A1 (de) 2006-10-26 2006-10-26 Reaktanzvorschalteinrichtung
PCT/EP2007/059120 WO2008049680A1 (fr) 2006-10-26 2007-08-31 Dispositif de prébranchement à réactance

Publications (2)

Publication Number Publication Date
EP2084940A1 EP2084940A1 (fr) 2009-08-05
EP2084940B1 true EP2084940B1 (fr) 2015-04-29

Family

ID=38617536

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070803116 Active EP2084940B1 (fr) 2006-10-26 2007-08-31 Dispositif de prébranchement à réactance

Country Status (7)

Country Link
US (1) US8023550B2 (fr)
EP (1) EP2084940B1 (fr)
CN (1) CN101529977A (fr)
DE (1) DE102006050624A1 (fr)
RU (1) RU2514856C2 (fr)
UA (1) UA97120C2 (fr)
WO (1) WO2008049680A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012101988B4 (de) * 2012-03-09 2014-07-17 Maschinenfabrik Reinhausen Gmbh Anordnung einer Luft-Drosselspule und eines Umschalters sowie Verfahren zur Herstellung einer solchen Anordnung
DE102012109844B4 (de) * 2012-10-16 2016-05-25 Maschinenfabrik Reinhausen Gmbh Vorrichtung und Verfahren zur Regelung eines Lichtbogenofens in der Anfangsphase eines Schmelzprozesses
EP2797088A1 (fr) * 2013-04-23 2014-10-29 ABB Technology AG Bobine pour transformateur à sec et transformateur à sec comportant une telle bobine
DE102014206008A1 (de) * 2014-03-31 2015-10-01 Siemens Aktiengesellschaft Vorrichtung und Verfahren zur dynamischen Einstellung eines Elektrolichtbogenofens

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US1839148A (en) 1929-08-14 1931-12-29 Albert E Greene Electric furnace and voltage control
DE1009735B (de) * 1955-09-20 1957-06-06 Siemens Ag Einrichtung zur Stromversorgung von Lichtbogenoefen
US3410946A (en) 1967-04-17 1968-11-12 Titanium Metals Corp Alternating current hot topping
US3493664A (en) * 1968-03-08 1970-02-03 Westinghouse Electric Corp Control system for electric arc furnace
CA1065028A (fr) * 1977-03-23 1979-10-23 Richard F. Dudley Bobine a noyau dans l'air
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Also Published As

Publication number Publication date
DE102006050624A1 (de) 2008-04-30
UA97120C2 (ru) 2012-01-10
RU2514856C2 (ru) 2014-05-10
RU2009119739A (ru) 2010-12-10
US20100033285A1 (en) 2010-02-11
EP2084940A1 (fr) 2009-08-05
WO2008049680A1 (fr) 2008-05-02
CN101529977A (zh) 2009-09-09
US8023550B2 (en) 2011-09-20

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