DE1588740A1 - Protection device for medium or high frequency heating systems - Google Patents

Protection device for medium or high frequency heating systems

Info

Publication number
DE1588740A1
DE1588740A1 DE19671588740 DE1588740A DE1588740A1 DE 1588740 A1 DE1588740 A1 DE 1588740A1 DE 19671588740 DE19671588740 DE 19671588740 DE 1588740 A DE1588740 A DE 1588740A DE 1588740 A1 DE1588740 A1 DE 1588740A1
Authority
DE
Germany
Prior art keywords
switch
medium
high frequency
command
heating systems
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.)
Pending
Application number
DE19671588740
Other languages
German (de)
Inventor
Hacht Werner Von
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of DE1588740A1 publication Critical patent/DE1588740A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions

Landscapes

  • General Induction Heating (AREA)
  • Emergency Protection Circuit Devices (AREA)

Description

4@enrz-cbtung für M'_Ittel- oder Hachfrequenzerwärmungs- a-zr2@@;en Die .Erfindung betrifft eine Schutzeinrichtung für Mittel- öder @lchfrequenzerwärmungsanlagen, insbesondere für Induk- tionsöfen', bei denen die Verbraucher über Schalter an einen Mittel= öder hochfrequenzgenerator angeschlossen sind. Insbesondere bei Kittelfrequenzerwärmungsanlagen ist die Ab-Schaltung der vorwiegend-induktiven Verbraucher schwierig; einmal weil die Induktivität den Strom an sich aufrechterhalten will und zum anderen, weil die Spannung am Schalter sehr rasch wiederkehrt, so daß stets die Gefahr der Rückzündung besteht. 4 @ enrz-cbtung for M'_Ittel- or Hachfrequency heating a-zr2 @@; en The invention relates to a protective device for medium Öder @ lch frequency heating systems, especially for induction tion ovens', in which the consumers are switched to a Medium = or a high-frequency generator is connected. In particular in the case of mid-frequency heating systems, it is difficult to switch off the predominantly inductive loads; on the one hand because the inductance wants to maintain the current and on the other hand because the voltage at the switch returns very quickly, so that there is always the risk of flashback.

Wird ein derartiger Dichtbogen dann nicht erkannt und werden nicht sofort Gegenmaßnahmen ergriffen, so kann es sehr leicht zu einer völligen Zerstörung des Schalters kommen.If such a sealing bend is then not recognized and will not be Immediately countermeasures are taken so it can very easily lead to complete destruction of the switch come.

Die Auf dbe der vorliegenden Erfindung besteht darrt, diesem Mißstand durch eine Schutzeinrichtung abzuhelfen. Erfindungsgemäß ist hierzu dem Schalter für die Mittelfrequenz- oder Hoehfrenuenzencrge ein Überwachungsglied zugeordnet, welches beim Öffnungsbefehl für den betreffenden Schalter wirksam wird und bei einem nach Beginn des Öffnungsvorganges an-' dauernden Fließen des:Stromes zum abzuschaltenden Verbraucher Steuerbefehle zur Abschaltung der Anlage abgibt.The object of the present invention is to address this deficiency remedy by a protective device. According to the invention, this is the switch A monitoring element is assigned for the medium frequency or high frequency range, which takes effect with the opening command for the relevant switch and with a after the beginning of the opening process, the continuous flow of: the current to be switched off Consumer issues control commands to switch off the system.

Damit die Schutzeinrichtung nicht zu häufig die Gesamtanlage abschalten muß, wird in Fortbildung der Erfindung gleichzeitig oder vor dem Öffnen des Schalters die Spannung des Generators herabgesetzt, z.B. auf 3() % der Nennspannung.So that the protective device does not switch off the entire system too often must, is in a development of the invention at the same time or before opening the switch the voltage of the generator is reduced, e.g. to 3 ()% of the nominal voltage.

Anhand der Zeichnung sei die Erfindung näher erläutert: .n den Mit-telfrequenzklemmen eines Mittelfrequenzgenerators 1 ist die Primärwicklung 4a eines Hochspannungstransformators 4 angeschlossen,_dessen-Sekundärwicklungen 4b über Schalter 6 die einzelnen Induktionsspulen 5, von der-der Einfachheit halber nur eine gezeigt ist, speisen.The invention is explained in more detail with the aid of the drawing: .n the mid-frequency terminals of a mid-frequency generator 1 is the primary winding 4a of a high voltage transformer 4 connected to its secondary windings 4b the individual induction coils 5 via switch 6, for the sake of simplicity only one is shown dining.

Muß z.B. aus Betriebsgründen eine der Induktionsspulen 5 abge-, schauet werden.,, so wird beim Öffnen des Schalters 6 durch einen Befehl des Kommandogebers B gleichzeitig das Stromüberw:::chuns,-;lied 9 wirksam gemacht und die Spannung des Generators 1, z.B. durcn Absenken der Erregung oder Ändern desPhasen-.schnittes, abgesenkt.If, for example, one of the induction coils 5 has to be checked for operational reasons are. ,, so when the switch 6 is opened by a command from the command transmitter B at the same time the Stromüberw ::: chuns, -; song 9 made effective and the voltage of generator 1, e.g. by lowering the excitation or changing the phase cut, lowered.

, ar Fließt trotz. des Öffnungsbefehls der Strom zur Spule 5 weiter, so spricht das Stromüberwachungsglied 9, welches eine dem ütronistwert entsprechende Größe über den Stromwandler ? er.-ar und_gibt ein Steuersignal auf den Kommandogeber B. .Dieser bringt eine Warnleuchte 10 zum Blinken und schaltet t-@ ei c=:zeiti@; durch Öffnen des Netzschalters 2 den Mittelfreauenzgenerator 1 ab., ar Flows in spite of. of the opening command continues the current to the coil 5, the current monitoring element 9 speaks, which is a variable corresponding to the actual value via the current transformer? er.-ar und_ gives a control signal to the command transmitter B. This causes a warning lamp 10 to flash and switches t- @ ei c =: zeiti @; by opening the power switch 2, the average frequency generator 1 off.

Claims (1)

Pi t en tans prüche
t. Schizt-einrictung für Mittel- oder Hoehfrequenzerwärmungs- anlagen, insbesondere für Induktionsöfen, bei denen die Ver- braucher über Schalter an einen Mittel- oder Hochfrequenz- generator,:ngeschlossen sind, dadurch gekennzeichnet, daß den 7jch@il tern (C) für die Mittel- oder Hocrifrequenzenergie "ewei-s ein Überwachungsglied (9) zugeordnet ist, welches bei einem Öffnungsbefehl für den betreffenden -Schalter wirksam wird und bei einem nach Beginn des Öffnungsvorganges des Sch.ilters (h) andauernden Fließen des Stromes zum abzuschaltenden Verbraucher k 5) Steuersignale zur Abschaltung der Anlak*e abgibt. ?. EEinrichtung nach Anspruch t, dadurch gekennzeichnet, daß gleich- zeitig mit dem Öffnungsbefehl für den Schalter (6) ein Kommando- geber einen Befehl zur Herabsetzung der Generatorspannung abgibt.
Pi t en tan's sayings
t. Schizt device for medium or high frequency heating systems, especially for induction furnaces where the switch to a medium or high frequency generator,: n are connected, characterized in that the 7jch @ il tern (C) for medium or high frequency energy "ewei-s is assigned a monitoring element (9), which at an opening command for the relevant switch is effective is and at one after the beginning of the opening process of the Sch.ilters (h) continuous flow of the current to be switched off Consumer k 5) emits control signals to switch off the system. ?. E device according to claim t, characterized in that the same in good time with the opening command for switch (6) a command gives a command to reduce the generator voltage gives away.
DE19671588740 1967-07-21 1967-07-21 Protection device for medium or high frequency heating systems Pending DE1588740A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0110931 1967-07-21

Publications (1)

Publication Number Publication Date
DE1588740A1 true DE1588740A1 (en) 1971-08-12

Family

ID=7530593

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19671588740 Pending DE1588740A1 (en) 1967-07-21 1967-07-21 Protection device for medium or high frequency heating systems

Country Status (2)

Country Link
JP (1) JPS4823933B1 (en)
DE (1) DE1588740A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5550376B2 (en) * 1974-01-24 1980-12-17
JPS5538815B2 (en) * 1974-07-29 1980-10-07
JPS6035226Y2 (en) * 1977-02-04 1985-10-19 日新電機株式会社 Oil-filled DC electrical equipment

Also Published As

Publication number Publication date
JPS4823933B1 (en) 1973-07-17

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