DE473614C - Current transformer for measuring the sum of several currents - Google Patents

Current transformer for measuring the sum of several currents

Info

Publication number
DE473614C
DE473614C DEA50612D DEA0050612D DE473614C DE 473614 C DE473614 C DE 473614C DE A50612 D DEA50612 D DE A50612D DE A0050612 D DEA0050612 D DE A0050612D DE 473614 C DE473614 C DE 473614C
Authority
DE
Germany
Prior art keywords
current transformer
sum
measuring
conductors
currents
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
DEA50612D
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.)
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 DEA50612D priority Critical patent/DE473614C/en
Priority to GB10173/28A priority patent/GB288606A/en
Application granted granted Critical
Publication of DE473614C publication Critical patent/DE473614C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/38—Instruments transformers for polyphase ac
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H01H2083/146—Provisions for avoiding disadvantages of having asymetrical primaries, e.g. induction of a magnetic field even by zero difference current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by unbalance of two or more currents or voltages, e.g. for differential protection with differential transformer

Description

Stromwandler zur 1Vlessung der Summe mehrerer Ströme Es sind Stromwandler zur Messung der Summe mehrerer Ströme bekannt, bei denen die diese Ströme führenden Leiter alle zusammen durch einen mit einer Sekundärwicklung ausgerüsteten Eisenkern geführt sind. Diese Stromwandler arbeiten mit befriedigender Genauigkeit, wenn die Primärleiter einander (verglichen mit ihrer Entfernung von der Sekundärwicklung) sehr nahe sind. Diese Bedingung ist erfüllt, wenn die Primärleiter zu einem einzigen Kabel verseilt sind. Liegen die Primärleiter aber weiter voneinander entfernt, wie es z. B. der Fall ist, wenn die Sammelschienen verschiedener Phase von einem gemeinsamen Eisenkern umschlossen werden, dann können sich Kraftlinien ausbilden, die mit der Sekundärwicklung oder einem Teil der Sekundärwicklung einerseits und nur einem Teil der Primärleiter andererseits verkettet sind. Dadurch wird das Meßergebnis gefälscht.Current transformers for measuring the sum of several currents. They are current transformers known for measuring the sum of several currents in which these currents lead Conductor all together through an iron core equipped with a secondary winding are led. These current transformers operate with satisfactory accuracy if the Primary conductors to each other (compared to their distance from the secondary winding) are very close. This condition is met when the primary conductor becomes a single Cables are stranded. But if the primary conductors are further apart, like it z. B. is the case when the busbars have different phases from one common Iron core are enclosed, then lines of force can form, which with the Secondary winding or part of the secondary winding on the one hand and only a part the primary conductor on the other hand are concatenated. This falsifies the measurement result.

Nach der Erfindung wird das Entstehen solcher Linien verhindert durch einen zwischen die Primärleiter und den mit der Sekundärwicklung versehenen Eisenkern eingeschobenen Mantel aus Eisenblech. Die Verwendung von magnetischen Schirmen )zwischen der Primär- und Sekundärwicklung von Transformatoren ist an sich bekannt.. Neu ist jedoch ,ihre Anwendung zur Erreichung gleicher Streuverhältnisse zwischen einer Wicklung und den Teilen einer anderen Wicklung. Der Eisenmantel erhält zweckmäßig in der Richtung senkrecht zu- den Primärleitern einen hohen elektrischen Widerstand, z. B. dadurch, daß man -ihn aus mehreren Schichten gegeneinander isolierten Blechs herstellt. Zwischen Mantel und Kern ist ein Luftspalt eingeschaltet. Die Wirkung des Mantels wind besser, wenn er innen mit einem zweiten Mantel aus elektrisch gut leitendem, magnetisch indifferentem Stoff, z. B. Kupfer, versehen ist. In Richtung der Primärleiter gibt man dem Mantel eine größere Breite als dem Eisenkern.According to the invention, the formation of such lines is prevented by an iron core provided with the secondary winding between the primary conductors inserted sheet iron coat. The use of magnetic shields) between the primary and secondary winding of transformers is known per se .. is new however, their application to achieve equal scatter ratios between one Winding and the parts of another winding. The iron jacket gets expedient a high electrical resistance in the direction perpendicular to the primary conductors, z. B. by -ihn of several layers of mutually insulated sheet metal manufactures. There is an air gap between the cladding and the core. The effect The coat winds better when it is electrically good inside with a second coat conductive, magnetically indifferent substance, e.g. B. copper is provided. In the direction the primary conductor gives the jacket a greater width than the iron core.

In .der Zeichnung ist. ein Ausführungsbeispiel in zwei Schnitten, senkrecht und parallel zu den Primärleitern, dargestellt. a sind die drei Sammelschienen einer Drehstromanlage, b der über sie geschobene gemeinsame Eisenkern, dessen Sekundärwicklung nicht gezeichnet ist. c ist eine nur mit einem Primärleiter verkettete Kraftlinie, deren Ausbildung .durch den Eisenblechmantel d verhindert werden soll. Dieser Mantel trägt innen einen aus Kupferblech bestehenden Überzug e. Der Blechmantel ist zweckmäßig breiter als der Eisenkern zu machen.In the drawing is. an embodiment in two sections, perpendicular and parallel to the primary conductors. a are the three busbars a three-phase system, b the common iron core pushed over it, its secondary winding is not drawn. c is a line of force linked to only one primary conductor, whose training .by the sheet iron jacket d is to be prevented. This coat has a copper sheet covering on the inside. The sheet metal jacket is useful wider than the iron core.

Claims (3)

PATENTANSPRÜCHE: i. Stromwandler zur Messung der Summe mehrerer Ströme mit einem Eisenkern, der die diese Ströme führenden Leiter umgibt, dadurch gekennzeichnet, daß zwischen den Leitern und dem Kern ein alle Leiter in einem geschlossenen Ring umgebender Eisenblechmantel angeordnet ist. PATENT CLAIMS: i. Current transformer for measuring the sum of several currents with an iron core surrounding the conductors carrying these currents, characterized in that that between the conductors and the core all conductors in a closed ring surrounding sheet iron jacket is arranged. 2. Stromwandler nach Anspruch i, dadurch gekennzeichnet, .daß der Blechmantel in an sich bekannter Weise senkrecht zu den Leitern unterteilt ist. 2. Current transformer according to claim i, characterized characterized, .that the sheet metal jacket in a known manner perpendicular to the Ladders is divided. 3. Stromwandler nach Anspruch i rund 2, dadurch gekennzeichnet, däß der Blechmantel innen einen Überzug aus unmagnetischem Metall mit hoher Leitfähigkeit trägt. q.. Stromwandler nach Anspruch i bis 3, dadurch gekennzeichnet, daß der Blechmantel breiter als der Eisenkern ist.3. Current transformer according to claim i around 2, characterized in that däß the sheet metal jacket inside a coating of non-magnetic metal with high conductivity wearing. q .. Current transformer according to claim i to 3, characterized in that the sheet metal jacket wider than the iron core.
DEA50612D 1927-04-13 1927-04-13 Current transformer for measuring the sum of several currents Expired DE473614C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEA50612D DE473614C (en) 1927-04-13 1927-04-13 Current transformer for measuring the sum of several currents
GB10173/28A GB288606A (en) 1927-04-13 1928-04-04 Improvements in or relating to current transformers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA50612D DE473614C (en) 1927-04-13 1927-04-13 Current transformer for measuring the sum of several currents

Publications (1)

Publication Number Publication Date
DE473614C true DE473614C (en) 1929-03-18

Family

ID=6937495

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA50612D Expired DE473614C (en) 1927-04-13 1927-04-13 Current transformer for measuring the sum of several currents

Country Status (2)

Country Link
DE (1) DE473614C (en)
GB (1) GB288606A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2849559A1 (en) * 1978-11-13 1980-05-22 Siemens Ag Polyphase high-current power supply system - eliminates interference between single-conductor transfers by screens positioned between iron cores and adjacent conductors

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3683302A (en) * 1970-12-15 1972-08-08 Fred C Butler Sensor for ground fault interrupter apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2849559A1 (en) * 1978-11-13 1980-05-22 Siemens Ag Polyphase high-current power supply system - eliminates interference between single-conductor transfers by screens positioned between iron cores and adjacent conductors

Also Published As

Publication number Publication date
GB288606A (en) 1929-02-21

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