DE2840550A1 - CURRENT TRANSFORMER FOR ELECTRICAL MEASURING DEVICES - Google Patents

CURRENT TRANSFORMER FOR ELECTRICAL MEASURING DEVICES

Info

Publication number
DE2840550A1
DE2840550A1 DE19782840550 DE2840550A DE2840550A1 DE 2840550 A1 DE2840550 A1 DE 2840550A1 DE 19782840550 DE19782840550 DE 19782840550 DE 2840550 A DE2840550 A DE 2840550A DE 2840550 A1 DE2840550 A1 DE 2840550A1
Authority
DE
Germany
Prior art keywords
current transformer
measuring devices
electrical measuring
air gap
instead
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
DE19782840550
Other languages
German (de)
Inventor
Heinz Ing Grad Schreiner
Gunther Dipl Phys Vieweg
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
Priority to DE19782840550 priority Critical patent/DE2840550A1/en
Priority to GB7932038A priority patent/GB2030373A/en
Publication of DE2840550A1 publication Critical patent/DE2840550A1/en
Pending 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
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Description

SIEMENS AKTIENGESELLSCHAFT Unser ZeichenSIEMENS AKTIENGESELLSCHAFT Our mark

Berlin und München VPA 7§ P 3 f 1 % Berlin and Munich VPA 7§ P 3 f 1%

Stromwandler für elektrische MeßgeräteCurrent transformers for electrical measuring devices

Lu. e Erfindung bezieht sich auf einen Stromwandler für elektrische Me.igeräte, bei dem ein Eisen- oder Ferritkern mit einem großen Luftspalt verwendet ist.Lu. e invention relates to a current transformer for electrical measuring devices with an iron or ferrite core with a large air gap is used.

Ein Stromwandler dieser Art ist durch die DE-OS 26 27 bekannt geworden. Dieser bekannte Stromwandler weist den Vorteil auf, daß er nicht nur für einen großen Meßbereich geeignet ist. sonaern auch einfach im Aufbau und daher billig in der Hersteilung ist. Der große Meßbereich wird durch die Linearisierung der Magnetisierungskurve infolge ~les großen Luftspaltes erreicht. Durch den großen Luftspalt wiederum lassen sich die Primär- und die Sekundärwicklung leicht auf den Kern aufschieben» B'-r bekannt ο Stromwandler hat jedoch den Nachteils daß er Infolge des unsymmetrischen Aufbaus einen relativ hohen Fremdfeidfehler aufweist.A current transformer of this type has become known from DE-OS 26 27. This known current transformer has the advantage that it is not only suitable for a large measuring range. sonaern is also simple in construction and therefore cheap to manufacture. The large measuring range is achieved by the linearization of the magnetization curve due ~ les large air gap. Due to the large air gap, in turn, the primary and secondary windings can easily be pushed onto the core »B'-r known ο However, the current transformer has the disadvantage that it has a relatively high external field error due to its asymmetrical structure.

Der Erfindung liegt die Aufgabe zugrundes einen Stromwandler der eingangs genannten Art derart zu gestaltens daß er praktisch unempfindlich gegen magnetische Fremd-Hs 2 Met / 5.9.1978The invention is based on the object's current converter of the type mentioned to make such that it's practically insensitive to external magnetic-Hs 2 Met / 05.09.1978

030012/0534 BAD ORIGINAL030012/0534 BATH ORIGINAL

28Λ055028Λ0550

VPA 78 P 3 1 7 9 BRDVPA 78 P 3 1 7 9 FRG

fehler ist.error is.

Der Stromwandler gemäß der Erfindung ist dadurch gekennzeichnet, daß statt eines Luftspaltes zwei zueinander symmetrisch angeordnete Luftspalte vorgesehen sind, und daß statt einer Sekundärwicklung zwei den beiden Luftspalten zugeordnete Sekundärwicklungen verwendet sind, welche so geschaltet sind, daß sich die in ihnen induzierten Spannungen addieren.
10The current transformer according to the invention is characterized in that instead of one air gap, two symmetrically arranged air gaps are provided, and that instead of one secondary winding, two secondary windings assigned to the two air gaps are used, which are connected so that the voltages induced in them add up.
10

Vorzugsweise ist auch die Primärwicklung auf beide Schenkel des Kerns gleichmäßig verteilt angeordnet.The primary winding is also preferably arranged so as to be uniformly distributed over both legs of the core.

Anhand der Zeichnung, in der ein Ausführungsbeispiel dargestellt ist, wird die Erfindung näher erläutert.Based on the drawing, in which an exemplary embodiment is shown, the invention is explained in more detail.

Mit 1 und 2 sind zwei U-fcrmige Kernteile bezeichnet, deren beide Schenkel la b.:w. 2a gegeneinander gerichtet und durch unmagnetische Beilagen 3 zur Erziejung symme-With 1 and 2 two U-shaped core parts are designated, whose two legs la b.:w. 2a directed against each other and by means of non-magnetic enclosures 3 for educating

Z) trischer Arbeitsluftspalte voneinander· getrennt sind. Um die Schenkel 1a und 2a sind symmetrisch zu den Luftspalten ;> die beiden Sekundärwicklungen 4 angeordnet. Sie sind hierbei so geschaltet, daß sich die in ihnen induzierten Spannungen addieren. Mit 5 und 6sind die entspre-( chenden Anschlüsse bezeichnet. Auf dem Joch des Kernteiles 1 ist eine Primärwicklung 7 mit ihren beiden Anschlüssen 8 und 9 angebracht.Z) trical working air gaps are separated from each other. The two secondary windings 4 are arranged around the legs 1a and 2a symmetrically to the air gaps. They are connected in such a way that the voltages induced in them add up. 5 and 6sind which correspond (sponding terminals, respectively. In the yoke of the core member 1, a primary winding 7 with its two terminals 8 and 9 is attached.

Werden die beiden Kernteile 1 und 2 von einem magnetischen Fremdfeld durchsetzt, so heben sich die durch dieses Feld in den Primärwicklungen h induzierten Spannungen gegenseitig auf. Auf diese Weise kann der Fremdfeldfehler optimal klein gehalten werden.If the two core parts 1 and 2 are penetrated by an external magnetic field, the voltages induced in the primary windings h by this field cancel each other out. In this way, the external field error can be kept as small as possible.

1 Figur1 figure

1 Patentanspruch1 claim

030012/0534030012/0534

LeerseiteBlank page

Claims (2)

PatentansprücheClaims 1. Stromwandler für elektronische Meßgeräte, bei dem ein Eisen- oder Ferritkern mit einem großen Luftspalt verwendet ist, dadurch gekennzeichnet, daß statt eines Luftspaltes ;:wei zueinander symmetrisch angeordnete Luftspalte (3) vorgesehen sind, und daß statt einer Sekundärwicklung zwei den beiden Luftspalten (3) zugeordnete Sekundärwicklungen (4) verwendet sind, welche so geschaltet sind, daß sich die in ihnen induzierten Spannungen addieren.1. Current transformer for electronic measuring instruments, in which a Iron or ferrite core used with a large air gap is, characterized in that instead of an air gap;: white mutually symmetrical arranged air gaps (3) are provided, and that instead of one secondary winding two of the two air gaps (3) associated secondary windings (4) are used, which are connected so that the induced in them Add up tensions. 2. Stromwandler nach Anspruch 1, d a d u r c h g ek e η η ζ e I c h η e t, daij auch die Primärwicklung (?') auf beide £<■ henkel t rleicr;nia;.ii^ verteilt, angeordnet is u.2. Current transformer according to claim 1, dadurchg ek e η η ζ e I ch η et, daij also the primary winding (? ') On both £ <■ handle t r leicr; nia; .ii ^ distributed, arranged is u. 030012/0534 BACLQBiGlNAL030012/0534 BACLQBiGlNAL
DE19782840550 1978-09-18 1978-09-18 CURRENT TRANSFORMER FOR ELECTRICAL MEASURING DEVICES Pending DE2840550A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19782840550 DE2840550A1 (en) 1978-09-18 1978-09-18 CURRENT TRANSFORMER FOR ELECTRICAL MEASURING DEVICES
GB7932038A GB2030373A (en) 1978-09-18 1979-09-14 Current Transformers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782840550 DE2840550A1 (en) 1978-09-18 1978-09-18 CURRENT TRANSFORMER FOR ELECTRICAL MEASURING DEVICES

Publications (1)

Publication Number Publication Date
DE2840550A1 true DE2840550A1 (en) 1980-03-20

Family

ID=6049742

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19782840550 Pending DE2840550A1 (en) 1978-09-18 1978-09-18 CURRENT TRANSFORMER FOR ELECTRICAL MEASURING DEVICES

Country Status (2)

Country Link
DE (1) DE2840550A1 (en)
GB (1) GB2030373A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9406292U1 (en) * 1993-12-09 1994-06-16 Siemens Ag Terminal block for an electrical device
EP1372166A1 (en) * 2002-06-10 2003-12-17 ABB Schweiz AG Instrument transformer for low voltage devices
CN110085408B (en) * 2019-05-20 2024-04-30 广州汉光电气股份有限公司 Novel current transformer with small-sized wide input range
CN110389253A (en) * 2019-07-16 2019-10-29 广州汉光电气股份有限公司 A kind of metering device and end metering device of three phase electrical parameters
CN110389254A (en) * 2019-07-16 2019-10-29 广州汉光电气股份有限公司 A kind of metering device and end metering device of single-phase electrical parameter

Also Published As

Publication number Publication date
GB2030373A (en) 1980-04-02

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