AT80991B - Arrangement on arc furnaces. Arrangement on arc furnaces. - Google Patents

Arrangement on arc furnaces. Arrangement on arc furnaces.

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Publication number
AT80991B
AT80991B AT80991DA AT80991B AT 80991 B AT80991 B AT 80991B AT 80991D A AT80991D A AT 80991DA AT 80991 B AT80991 B AT 80991B
Authority
AT
Austria
Prior art keywords
arrangement
arc furnaces
phase
furnace
generator
Prior art date
Application number
Other languages
German (de)
Original Assignee
Norsk Hydro Elektrisk
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Norsk Hydro Elektrisk filed Critical Norsk Hydro Elektrisk
Application granted granted Critical
Publication of AT80991B publication Critical patent/AT80991B/en

Links

Description

  

   <Desc/Clms Page number 1> 
 



  Anordnung an Lichtbogenöfen. 



   Der   Ride : stand   eines elektrischen Lichtbogens wird, wie bekannt, bei'Änderungen der Stromstärke derart geändert, dass die Elektrodenspannung, bei zunehmender Stromstärke abnimmt ; die Charakteristik des Lichtbogens ist abfallend. Um einen stabilen Betrieb zu erzielen, kann man deshalb nicht den Lichtbogen mit konstanter Spannung speisen, sondern die Charakteristik des Speisestromes muss wenigstens ebenso viel abfallend wie die des Licht- 
 EMI1.1 
 Stromquelle und dem Ofen erreicht. Diese induktiven Widerstände entsprechen indessen bei grossen Öfen, z.

   B. zur Verbrennung des Stickstoffes der Luft, einem scheinbaren Wattverbrauch, der den   Leistungsfaktor der Anlage beträchtlich verschlechtert.   
 EMI1.2 
 
Ofen per Phase eines zwei oder mehrphasigen Wechselstromnetzes   mit Xulleitung,   durch die der Leistungsfaktor bedeutend verbessert wird. Die Erfindung besteht hauptsächlich darin, dass eine Induktionsspule in die Nulleitung zwischen den Nullpunkten des Erzeugers (bzw. der Erzeuger) und der Öfen eingeschaltet ist. 



   Die Erfindung ist in der Zeichnung veranschaulicht, die eine gemäss derselben geschaltete   Dreipbasenanlage schematisch zeigt.   G bezeichnet einen Dreiphasenerzeuger l1 l2 und l3 die Phasenleitungen und a, b. c drei L'chtbogenöfen, die je einer per Phase, in Reihe mit je einer Induktionsspule geschaltet sind. Zwischen den   Nullpunktes'des   Erzeugers und der Öfen ist eine Xul eitung lo angeordnet, in die eine Induktionsspule d, eingeschaltet jst. 



   Durch die Einschaltung der   Induktionsspule   in die Nulleitung wird erreicht : 
 EMI1.3 
 



   2. Das Entstehen höherer, harmonischer Ströme per Phase, die nicht in einem der Phasenzahl der Anlage entsprechenden Verhältnis zueinander stehen, wird bedeutend erschwert ; die   Verhinderung derartiger Ströme führt auch, wie bekannt, einevergrösserung   des Leistungsfaktors der Anlage herbei. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Arrangement on arc furnaces.



   The ride: when an electric arc is present, as is known, when the current intensity changes, the electrode voltage decreases with increasing current intensity; the characteristic of the arc is sloping. In order to achieve stable operation, the arc cannot therefore be fed with constant voltage, but the characteristic of the feed current must drop at least as much as that of the light
 EMI1.1
 Power source and the furnace. These inductive resistances, however, correspond to large furnaces, e.g.

   B. to burn the nitrogen in the air, an apparent watt consumption, which worsens the power factor of the system considerably.
 EMI1.2
 
Oven per phase of a two-phase or multi-phase AC network with Xul conductors, through which the power factor is significantly improved. The invention consists mainly in the fact that an induction coil is switched on in the neutral line between the zero points of the generator (or the generator) and the furnace.



   The invention is illustrated in the drawing, which schematically shows a three-base system connected according to the same. G denotes a three-phase generator l1 l2 and l3 the phase lines and a, b. c three electric arc ovens, one per phase, connected in series with one induction coil each. Between the zero point of the generator and the furnace there is a supply line lo, into which an induction coil d is switched on.



   By switching on the induction coil in the neutral line, the following is achieved:
 EMI1.3
 



   2. The emergence of higher, harmonic currents per phase, which are not in a ratio to one another corresponding to the number of phases in the system, is made significantly more difficult; the prevention of such currents also leads, as is known, to an increase in the power factor of the system.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

 

Claims (1)

PATENT-ANSPRUCH : Anordnung an elektrischen Lichtbogenofenanlagen, bei denen lediglich ein Ofen per Phase eines zwei-oder mehrphasigen Wechselstromnetzes mit Xulleitung eingeschaltet ist, dadurch gekennzeichnet, dass eine Induktionsspule in die Nulleitung zwischen dem Nullpunkte des Erzeugers (bzw. der Erzeuger) und dem der Öfen eingeschaltet Ist. EMI1.4 **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Arrangement on electric arc furnace systems in which only one furnace is switched on per phase of a two-phase or multi-phase alternating current network with Xulleitung, characterized in that an induction coil is switched on in the neutral line between the zero point of the generator (or the generator) and that of the furnace. EMI1.4 ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT80991D 1915-11-05 1917-09-10 Arrangement on arc furnaces. Arrangement on arc furnaces. AT80991B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE80991X 1915-11-05

Publications (1)

Publication Number Publication Date
AT80991B true AT80991B (en) 1920-07-26

Family

ID=20273142

Family Applications (1)

Application Number Title Priority Date Filing Date
AT80991D AT80991B (en) 1915-11-05 1917-09-10 Arrangement on arc furnaces. Arrangement on arc furnaces.

Country Status (1)

Country Link
AT (1) AT80991B (en)

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