DE543481C - Device for switching on transformers and similar electrical apparatus - Google Patents

Device for switching on transformers and similar electrical apparatus

Info

Publication number
DE543481C
DE543481C DES95321D DES0095321D DE543481C DE 543481 C DE543481 C DE 543481C DE S95321 D DES95321 D DE S95321D DE S0095321 D DES0095321 D DE S0095321D DE 543481 C DE543481 C DE 543481C
Authority
DE
Germany
Prior art keywords
transformers
switch
switching
electrical apparatus
similar electrical
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
DES95321D
Other languages
German (de)
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 Schuckertwerke AG
Siemens AG
Original Assignee
Siemens Schuckertwerke AG
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 Schuckertwerke AG, Siemens AG filed Critical Siemens Schuckertwerke AG
Priority to DES95321D priority Critical patent/DE543481C/en
Application granted granted Critical
Publication of DE543481C publication Critical patent/DE543481C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
    • H02H9/002—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers

Description

Einrichtung zum Einschalten von Transformatoren und ähnlichen elektrischen Apparaten Beim Einschalten von Transformatoren treten bekanntlich Einschaltschwingungen auf, wobei der Einschaltstrom unter Umständen das io- bis 2ofache des normalen Stromes erreichen kann. Die Größe des Einschaltstromes hängt von der Sättigung des Eisens und davon ab, in welchem Punkt der Spannungskurve eingeschaltet wird. Diese Einschaltschwingung dauert je nach der Dämpfung des Kreises einige Sekunden, so daß der Schalter, durch den der Transformator eingeschaltet wird, auslöst. Es ist deshalb vorgeschlagen worden, die Transformatoren nicht sofort an die volle Spannung anzuschalten, sondern sie erst über einen Widerstand an die Netzspannung zu legen. Dazu dienen Schalter mit Vorkontakten. Durch die Erfindung werden diese Schalter überflüssig, die wegen ihres sperrigen Aufbaues viel Platz. wegnehmen.Device for switching on transformers and similar electrical Apparatus It is well known that switch-on oscillations occur when transformers are switched on on, whereby the inrush current may be 10 to 2 times the normal current can reach. The size of the inrush current depends on the saturation of the iron and from the point at which the voltage curve is switched on. This switch-on oscillation takes a few seconds, depending on the attenuation of the circuit, so that the switch goes through which the transformer is switched on triggers. It is therefore suggested not to switch the transformers to full voltage immediately, but rather first to connect it to the mains voltage via a resistor. Switches are used for this with previous contacts. The invention makes these switches superfluous because of a lot of space due to its bulky structure. take away.

Gemäß der Erfindung wird zwischen Schalter und Transformator ein Widerstand mit positiven Temperaturkoeffizienten geschaltet und die Größe dieses Widerstandes so bemessen und sein Material so gewählt, daß der Einschaltstrom auf einen geringeren Wert als der des Auslösestromes des Schalters in einer Zeit herabgesetzt wird, die kleiner als die Auslösezeit des Schalters ist. Anordnungen, bei denen Widerstände mit positiven Temperaturkoeffizienten verwendet werden, sind bekannt. Bei diesen Anordnungen werden aber die Widerstände zu einem anderen Zweck, nämlich zur Begrenzung des Kurzschlußstromes, verwendet. Durch die Erfindung wird die Eigenschaft der Widerstände mit positiven Temperaturkoeffizienten ausgenutzt, um ein störungsfreies Einschalten von Transformatoren oder ähnlichen Apparaten zu erreichen.According to the invention, there is a resistor between the switch and the transformer switched with positive temperature coefficients and the size of this resistance so dimensioned and its material chosen so that the inrush current to a lower Value than that of the tripping current of the switch is reduced in a time that is less than the tripping time of the switch. Arrangements in which resistors with positive temperature coefficients are known. With these Arrangements, however, use the resistors for a different purpose, namely to limit of the short-circuit current. The invention makes the property of the resistors with positive temperature coefficients used to ensure trouble-free switch-on from transformers or similar devices.

Das Material, aus dem der Widerstand besteht, kann z. B. Eisen oder jedes andere Material mit positivem Temperaturkoeffizienten sein. Zweckmäßig wird man den Widerstand, wenn er starke Erhitzung aushalten soll, in einem luftleeren Raum oder auch in einem mit indifferentem Gas angefüllten Raum anordnen.The material from which the resistor is made can e.g. B. iron or be any other material with a positive temperature coefficient. Will be expedient the resistance, if it is to withstand intense heating, is in a vacuum Arrange space or in a space filled with inert gas.

Claims (1)

PATENTANSPRUCH: Einrichtung zum Einschalten von Transformatoren und ähnlichen elektrischen Apparaten, dadurch gekennzeichnet, daß vor dem Transformator ein Widerstand mit positivem Temperaturkoeffizienten liegt und die Größe des Widerstandes und sein Material so gewählt sind, daß der Einschaltstrom auf einen geringeren Wert als den des Auslösestromes des Schalters in einer Zeit herabgesetzt wird, die kleiner als die Auslösezeit des Schalters ist.PATENT CLAIM: Device for switching on transformers and Similar electrical apparatus, characterized in that in front of the transformer there is a resistor with a positive temperature coefficient and the size of the resistor and its material are chosen so that the inrush current is reduced to a lower value than that of the tripping current of the switch is reduced in a time that is smaller than is the tripping time of the switch.
DES95321D 1929-12-01 1929-12-01 Device for switching on transformers and similar electrical apparatus Expired DE543481C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES95321D DE543481C (en) 1929-12-01 1929-12-01 Device for switching on transformers and similar electrical apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES95321D DE543481C (en) 1929-12-01 1929-12-01 Device for switching on transformers and similar electrical apparatus

Publications (1)

Publication Number Publication Date
DE543481C true DE543481C (en) 1932-02-05

Family

ID=7519287

Family Applications (1)

Application Number Title Priority Date Filing Date
DES95321D Expired DE543481C (en) 1929-12-01 1929-12-01 Device for switching on transformers and similar electrical apparatus

Country Status (1)

Country Link
DE (1) DE543481C (en)

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