DE442564C - Equipment on electrical alternating current devices with current winding, especially for overcurrent relays - Google Patents

Equipment on electrical alternating current devices with current winding, especially for overcurrent relays

Info

Publication number
DE442564C
DE442564C DEA44580D DEA0044580D DE442564C DE 442564 C DE442564 C DE 442564C DE A44580 D DEA44580 D DE A44580D DE A0044580 D DEA0044580 D DE A0044580D DE 442564 C DE442564 C DE 442564C
Authority
DE
Germany
Prior art keywords
current
winding
equipment
alternating current
overcurrent relays
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
DEA44580D
Other languages
German (de)
Inventor
Josef Biermanns
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.)
AEG AG
Original Assignee
AEG 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 AEG AG filed Critical AEG AG
Priority to DEA44580D priority Critical patent/DE442564C/en
Application granted granted Critical
Publication of DE442564C publication Critical patent/DE442564C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments

Description

Einrichtung an elektrischen Wechselstromapparaten mit Stromwicklung, insbesondere für ilberstromrelais. Elektrische Relais, Meßinstrumente u. dgl. für Wechselstrom mit Stromwicklung sollen häufig schon auf einen sehr niedrigen Strom ansprechen; sie dürfen anderseits aber von sehr hohen Strömen, die bei heftigen Kurzschlüssen den 30- bis 5ofachen Wert des Ansprechstromes erreichen können, nicht beschädigt werden. Diese beiden einander widersprechenden Forderungen lassen sich gleichzeitig nur unbefriedigend erfüllen.Installation on electrical alternating current apparatus with current winding, in particular for overcurrent relays. Electrical relays, measuring instruments and the like for alternating current with a current winding should often respond to a very low current; On the other hand, however, they must not be damaged by very high currents, which in the event of violent short circuits can reach 30 to 5 times the value of the response current. These two contradicting requirements can only be met in an unsatisfactory manner at the same time.

Gegenstand der Erfindung ist ,eine Einrichtung, die, ohne die Empfindlichkeit fürkleine Ströme zu verschlechtern, beim Auftreten hoher Ströme (also im Kurzschluß) einen erheblichen Teil dieser Ströme von der gefährdeten Wicklung abhält. Die Erfindung besteht darin, daß .parallel zu der Stromwicklung eine Drosselspule mit ganz geschlossenen Eisenkern gzeschaltet wird. In der Zeichnung ist ein Ausführungsbeispiel dargestellt. a ist der Kern des Relais oder Meßinstruanents, b der .aus Blechringen fugenlos zusammengesetzte Drosselspulenkern. Der Gesamtstrom 1 teilt sich in den Relaisstrom il und den Drosselspulenstrom !z.The object of the invention is a device that, without the sensitivity for small currents to worsen when high currents occur (i.e. in a short circuit) keeps a significant part of these currents from the endangered winding. The invention consists in that .parallel to the current winding a choke coil with completely closed Iron core is switched on. An exemplary embodiment is shown in the drawing. a is the core of the relay or measuring instrument, b the one made of sheet metal rings without joints composite inductor core. The total current 1 is divided into the relay current il and the inductor current!

Macht man nun z. B. den magnetischen Widerstand des Eisenweges der Drosselspule sehrklein gegenüber.demmagnetischen.Widerstand des Instrumentes, so wird, wenn der Strom J ansteigt, der von der Drosselspule aufgenommene Strom i2 infolge der schnellen ansteigenden Sättigung viel schneller als il wachsen. Man kann es auf diese oder ähnliche Weise leicht erreichen, daß bei dem kleinsten Wert von J, auf den das Relais noch anspricht, nur i Prozent durch die Drosselspule fließt, die- Empfindlichkeit also praktisch nicht verschlechtert wird, daß aber bei kräftigen Kurzschlüssen ; o bis 8o Prozent von J von der Drosselspule aufgenommen werden, das Relais also nur 1/5 dies Gesamtstromes erhält. Dadurch kann man den Verwendungsbereich ,eines gegebenen Instruments auf das Fünffache erweitern. Durch geeignete Bemessung des Eisenkörpers und Wahl der Eisensorte läZt sich auch die Phasenverschiebung in d;er Drosselspule derjenigen in dem Instrument gleichmachen, so daß die Drosselspule keinen Winkelfehler bedingt, was für Instrumente mit Strom- und Spannungswicklung wichtig ist.Do you now z. If, for example, the magnetic resistance of the iron path of the choke coil is very small compared to the magnetic resistance of the instrument, then, if the current J increases, the current i2 absorbed by the choke coil will grow much faster than il, due to the rapidly increasing saturation. In this or a similar way it can easily be achieved that with the smallest value of J to which the relay still responds, only 1 percent flows through the choke coil, so the sensitivity is practically not impaired, but that with strong short circuits; o to 80 percent of J are absorbed by the choke coil, so the relay only receives 1/5 of this total current. This allows the area of use of a given instrument to be expanded fivefold. By appropriately dimensioning the iron body and choosing the type of iron, the phase shift in the choke coil can also be made the same as that in the instrument, so that the choke coil does not cause any angular error, which is important for instruments with current and voltage windings.

Claims (1)

PATENTANSPRUCH: Einrichtung an elektrischen W echselstromapparaten mit Stromwicklung, insbesondere für üb;erstromrelais, dadurch gekennzeichnet, .daß dieser Wicklung eine Drosselspule von solchen Abmessungen parallel geschaltet ist, .daß die Drosselspule einen kleinen Teil des Gesaints,tromes aufnimmt, solange dieser niedrig ist, jedoch einen um so größeren Teil, je mehr der Gesamtstrom wächst. PATENT CLAIM: Device on alternating current devices with current winding, in particular for overcurrent relays, characterized in that .that a choke coil of such dimensions is connected in parallel with this winding, .that the choke coil absorbs a small part of the total current as long as it is low, however, the greater the proportion, the more the total current grows.
DEA44580D 1925-03-28 1925-03-28 Equipment on electrical alternating current devices with current winding, especially for overcurrent relays Expired DE442564C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA44580D DE442564C (en) 1925-03-28 1925-03-28 Equipment on electrical alternating current devices with current winding, especially for overcurrent relays

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA44580D DE442564C (en) 1925-03-28 1925-03-28 Equipment on electrical alternating current devices with current winding, especially for overcurrent relays

Publications (1)

Publication Number Publication Date
DE442564C true DE442564C (en) 1927-04-09

Family

ID=6934265

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA44580D Expired DE442564C (en) 1925-03-28 1925-03-28 Equipment on electrical alternating current devices with current winding, especially for overcurrent relays

Country Status (1)

Country Link
DE (1) DE442564C (en)

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