DE267968C - - Google Patents

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Publication number
DE267968C
DE267968C DENDAT267968D DE267968DA DE267968C DE 267968 C DE267968 C DE 267968C DE NDAT267968 D DENDAT267968 D DE NDAT267968D DE 267968D A DE267968D A DE 267968DA DE 267968 C DE267968 C DE 267968C
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DE
Germany
Prior art keywords
electrodes
phase
voltage
bath
voltages
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.)
Expired
Application number
DENDAT267968D
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German (de)
Publication date
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Publication of DE267968C publication Critical patent/DE267968C/de
Expired legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00Heating by electric discharge
    • H05B7/02Details
    • H05B7/144Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00Arrangement of elements for electric heating in or on furnaces
    • F27D11/02Ohmic resistance heating
    • F27D11/04Ohmic resistance heating with direct passage of current through the material being heated
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00Heating by electric discharge
    • H05B7/18Heating by arc discharge
    • H05B7/20Direct heating by arc discharge, i.e. where at least one end of the arc directly acts on the material to be heated, including additional resistance heating by arc current flowing through the material to be heated
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

PATENTSCHRIFTPATENT LETTERING

- JVe 267968 -KLASSE 2\h. GRUPPE - JVe 267968 - CLASS 2 \ h. GROUP

Schaltung für elektrische Drehstromöfen. Patentiert im Deutschen Reiche vom 9. Juni 1911 ab. Circuit for electric three-phase ovens. Patented in the German Empire on June 9, 1911.

Für diese Anmeldung ist bei der Prüfung gemäß dem Unionsvertrage vomFor this registration, the examination according to the Union Treaty of

20. März 1883March 20, 1883

14. Dezember 1900 auf Grund der Anmeldung in Frankreich vom 9. Juni 1910 anerkannt.Recognized on December 14, 1900 on the basis of the registration in France on June 9, 1910.

die Prioritätthe priority

Die gegenwärtige Erfindung bezweckt eine Speisungsmethode elektrischer Öfen mit leitendem Herde mittels Drehstroms; nach ihr ist der Ofen mit drei Elektroden oder Elektrodengruppen versehen, die in besonderer Weise sternförmig mit den drei Phasen verbunden sind, wobei der gemeinsame Leiter an den Herd des Ofens angeschlossen ist.The present invention aims at a method of energizing electric ovens with conductive Stoves by means of three-phase current; after her is the furnace with three electrodes or groups of electrodes provided, which are star-connected in a special way with the three phases, the common conductor to the stove of the oven is connected.

Die neue Speisungsmethode hat den Zweck, eine möglichst große Menge des Stromes zu zwingen, durch das Bad zu fließen, wobei die drei Phasen ziemlich gleich belastet sind.The purpose of the new feeding method is to supply the largest possible amount of electricity force to flow through the bath, the three phases being loaded pretty equally.

Wenn man in einen elektrischen Ofen der erwähnten Gattung die drei Elektroden mit den in gewöhnlicher Weise sternförmig geschalteten Phasen verbinden würde, wobei der Nulleiter an den Herd angeschlossen ist, würde zwischenIf you put the three electrodes with the would normally connect star-connected phases, with the neutral conductor on connected to the stove would be between

.- den Elektroden und dem Bad die gleiche Phasenspannung für die drei Elektroden, und zwischen diesen Elektroden selbst die gleiche zusammengesetzte Spannung für alle drei vorhanden sein. Bei einer derartigen Anordnung müßte —- gleiche Belastung der drei Phasen vorausgesetzt — gar kein Strom durch das Bad nach unten zu den Polen hindurchgehen..- the electrodes and the bath the same Phase voltage for the three electrodes, and the same between these electrodes themselves composite tension exist for all three. With such an arrangement - assuming the same load on the three phases - there would have to be no current at all through the bath go down to the poles.

Nach der vorliegenden Erfindung verwendet man eine unsymmetrische Sternschaltung, in welcher eine der Phasen umgekehrt ist, wodurch es möglich wird, die nachfolgenden Wirkungen zu erzielen:Used in accordance with the present invention one an asymmetrical star connection in which one of the phases is reversed, whereby it becomes possible to achieve the following effects:

3535

4040

Die Spannung zwischen den drei Elektroden und dem Bade sowie zwei Spannungen zwischen den Elektroden sind der Phasenspannung gleich, dagegen ist die · dritte Spannung zwischen den Elektroden die kombinierte Spannung.The voltage between the three electrodes and the bath and two voltages between The phase voltage between the electrodes is the same, whereas the third voltage between the Electrodes the combined voltage.

Die beiliegende, als Beispiel gegebene Zeichnung stellt schematisch eine Ausführungsform eines elektrischen Ofens mit drei Elektroden und leitendem Herde dar, welcher Ofen sich nach der gegenwärtigen Erfindung speisen läßt.The accompanying drawing, given as an example, shows schematically an embodiment an electric furnace with three electrodes and conductive hearth, which furnace is after of the present invention.

In beiliegender Zeichnung stellenPlace in the accompanying drawing

i, 2, 3 die drei Phasen eines Hochspannungsdrehstromnetzes dar; α ist ein Einphasentransformator, dessen Primärwicklung an die Phase 1 und die Phase 3 angeschlossen ist; b ist ein gleicher Transformator, dessen Primärwicklung an die Phase 2 bzw. 3 angeschlossen ist, und endlich ist die Primärwicklung des Transformators c an die Phase 1 und 2 angeschlossen. Die Sekundärwicklungen der Transformatoren a, b, c sind einerseits mit dem bei d1, d2 an das Bad a angeschlossenen gemeinsamen Leiter d' und andererseits mit den Elektroden f bzw. g, h ■ des Ofens * verbunden. Die Sekundärwicklung des Transformators α ist bezüglich der Sekundärwicklungen der Transformatoren b und c umgekehrt. i, 2, 3 represent the three phases of a high-voltage three-phase network; α is a single-phase transformer, the primary winding of which is connected to phase 1 and phase 3; b is an identical transformer, the primary winding of which is connected to phase 2 or 3, and finally the primary winding of transformer c is connected to phase 1 and 2. The secondary windings of the transformers a, b, c are connected on the one hand to the common conductor d ' connected to the bath a at d 1 , d 2 and on the other hand to the electrodes f and g, h ■ of the furnace *. The secondary winding of the transformer α is reversed with respect to the secondary windings of the transformers b and c.

Die Wirkungsweise der beschriebenen Vorrichtung ist folgende:The mode of operation of the device described is as follows:

Wenn z. B. zwischen jeder der Elektroden f, If z. B. between each of the electrodes f,

g, h und dem Bade e eine Spannung von 60 Volt, gleich der Phasenspannung, vorhanden ist, wird die Spannung zwischen den Elektroden g und h gleich der zusammengesetzten Spannung, d. h. 60 Volt mal 1,73 — 104 Volt sein; zwischen f und h und zwischen f und g beträgt die Spannung dagegen 60 Volt, indem der Spannungsunterschied zwischen den Elektroden von der Umkehrung der Sekundärwicklung α herrührt. g, h and bath e is 60 volts equal to the phase voltage, the voltage between electrodes g and h will be equal to the composite voltage, ie 60 volts times 1.73-104 volts; between f and h and between f and g , on the other hand, the voltage is 60 volts, since the voltage difference between the electrodes is due to the reversal of the secondary winding α .

, Die Umkehrung der gewendeten Phase könnte ebenfalls durch die Umkehrung der Primär-■ wicklung des zugehörigen Transformators anstatt der sekundären erreicht werden.
Wie oben erwähnt, gestattet die beschriebene Schaltung, den größten Teil des Stromes zu zwingen, durch das Bad, welches auf diese Weise auf eine hohe Temperatur gebracht wird, zu fließen, wobei die drei Phasen ziemlich gleich belastet sind.
The reversal of the reversed phase could also be achieved by reversing the primary ■ winding of the associated transformer instead of the secondary.
As mentioned above, the circuit described makes it possible to force most of the current to flow through the bath, which is brought to a high temperature in this way, the three phases being loaded fairly equally.

Es liegt auf der Hand, daß man anstatt drei einfacher Elektroden, wie dies in der Zeichnung dargestellt worden ist, auch drei Elektrodengruppen verwenden könnte. Der gemeinsame Leiter könnte natürlich an mehr oder weniger als zwei Stellen an das Bad angeschlossen werden.It is obvious that instead of three simple electrodes, as shown in the drawing has been shown could also use three groups of electrodes. The common one Ladders could of course be connected to the bathroom in more or less than two places will.

Claims (1)

Patent-Anspruch:Patent claim: Schaltung für elektrische Drehstromöfen, bei welchen die über dem Bade befindlichen Elektroden mit den Sekundärwicklungen der Speisetransformatoren verbunden sind, die sternförmig geschaltet und andererseits durch den Nulleiter mit dem leitenden Herde verbunden sind, dadurch . gekennzeichnet, daß die eine Phase der Sternschaltung durch Wendung der Sekundärwicklung oder der Primärwicklung des entsprechenden Transformators umgekehrt ist, so daß die Spannungen zwischen den Elektroden und dem Bade sowie zwei Spannungen zwischen zwei Elektroden unter sich gleich der Phasenspannung sind, während die Spannung für den dritten Elektroden-Stromkreis eine kombinierte ist.Circuit for electric three-phase ovens, in which those located above the bath Electrodes are connected to the secondary windings of the supply transformers, which are connected in a star shape and on the other hand connected by the neutral conductor to the conductive hearth, thereby . characterized in that the one phase of the star connection by reversing the secondary winding or vice versa of the primary winding of the corresponding transformer is so that the voltages between the electrodes and the bath as well as two voltages between two electrodes are equal to the phase voltage, while the voltage for the third electrode circuit is a combined. Hierzu ι Blatt Zeichnungen.For this purpose ι sheet of drawings.
DENDAT267968D Expired DE267968C (en)

Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6012875A (en) * 1997-04-02 2000-01-11 The Conair Group, Inc. Apparatus for dispensing granular material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6012875A (en) * 1997-04-02 2000-01-11 The Conair Group, Inc. Apparatus for dispensing granular material

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