DE2207610A1 - ARRANGEMENT FOR INCREASING THE MEASURING RANGE OF ELECTRONICALLY COMPENSATED CURRENT CONVERTERS - Google Patents

ARRANGEMENT FOR INCREASING THE MEASURING RANGE OF ELECTRONICALLY COMPENSATED CURRENT CONVERTERS

Info

Publication number
DE2207610A1
DE2207610A1 DE19722207610 DE2207610A DE2207610A1 DE 2207610 A1 DE2207610 A1 DE 2207610A1 DE 19722207610 DE19722207610 DE 19722207610 DE 2207610 A DE2207610 A DE 2207610A DE 2207610 A1 DE2207610 A1 DE 2207610A1
Authority
DE
Germany
Prior art keywords
arrangement
measuring range
current
increasing
compensated current
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
DE19722207610
Other languages
German (de)
Inventor
Manfred Dipl Ing Schwendtner
Guenter Steinmueller
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 DE19722207610 priority Critical patent/DE2207610A1/en
Priority to NL7301232A priority patent/NL7301232A/xx
Priority to IT2032373A priority patent/IT979055B/en
Priority to CH213573A priority patent/CH553414A/en
Priority to GB759573A priority patent/GB1419023A/en
Priority to FR7305466A priority patent/FR2172323A1/fr
Priority to SE7302223A priority patent/SE376803B/xx
Priority to ES411725A priority patent/ES411725A1/en
Priority to JP48020078A priority patent/JPS4894828A/ja
Publication of DE2207610A1 publication Critical patent/DE2207610A1/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/08—Circuits for altering the measuring range
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H01F27/422—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers
    • H01F27/427—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils for instrument transformers for current transformers
    • 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
    • H01F38/32—Circuit arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Description

Anordnung zur Vergrößerung des Meßbereiches von elektronisch kompensierten Stromwandlern Arrangement for enlarging the measuring range of electronically compensated current transformers

Die Erfindung "bezieht sich auf eine Anordnung sur Vergrößerung des Meßbereiches von elektronisch kompensierten Stromwandlern.The invention "relates to an arrangement for magnification of the measuring range of electronically compensated current transformers.

Bei elektronisch kompensierten Stromwandlern wird, von der bekannten Tatsache Gebrauch gemacht, daß sich die Übersetzungsfehler von Stromwandlern in der Weise verringern lassen, daß die Induktion im Stromwandler möglichst zum Verschwinden gebracht wird. Ein solcher Wandler ist praktisch unabhängig von Strom- und Bürdenänderungen. Derartig kompensierte Stromwandler weisen eine relativ hohe Genauigkeit bei geringem Eigengewicht auf. Bei elektronisch fehlerkompensierten Stromwandlern wird die Bürdenleistung von einem Verstärker aufgebracht. Dieser muß also für die volle Bürdenleistung ausgelegt sein. Die Kosten eines solchen fehlerkompensierten Stromwandlers hängen in erster Linie von den Kosten des Verstärkers ab. Diese steigen jedoch wesentlich mit zunehmender Leistung. Bei größeren Primärströmen (z.B. 60 A) und begrenztem Kernvolumen werden jedoch aufgrund der stark ansteigenden inneren Wandlerbürde die sekundär aufzubringenden Leistungen so groß, daß preisgünstige Verstärker nicht mehr eingesetzt werden können.In the case of electronically compensated current transformers, the known fact that the translation errors can be reduced by current transformers in such a way that the induction in the current transformer disappeared as far as possible will. Such a converter is practically independent of changes in current and burden. Current transformers compensated in this way have a relatively high accuracy with low weight. With electronically error-compensated current transformers the burden power is applied by an amplifier. This must therefore be designed for the full burden. The cost of such an error-compensated current transformer depends primarily on the cost of the amplifier. However, these increase significantly with increasing performance. at larger primary currents (e.g. 60 A) and limited core volume However, due to the sharply increasing internal transducer burden, the secondary power to be applied is so great that Inexpensive amplifiers can no longer be used.

Der Erfindung liegt demgemäß die Aufgabe zugrunde, eine Anordnung zur Vergrößerung des Meßbereiches vom elektronisch fehlerkompensierten Stromwandlern zu schaffen, bei der ohne Beeinträchtigung der Meßgenauigkeit preisgünstige Verstärker ■ verwendet werden können. Die Anordnung gemäß der Erfindung besteht darin, daß der Primärwicklung des Stromwandlers ein Shunt von solcher Größe parallelgeschaltet ist, daß derThe invention is accordingly based on the object of an arrangement to increase the measuring range of electronically error-compensated current transformers, with the without Impairment of the measurement accuracy, inexpensive amplifiers ■ can be used. The arrangement according to the invention is that the primary winding of the current transformer is connected in parallel with a shunt of such a size that the

309835/06 4309835/06 4

- 2 - VPA 72/3034- 2 - VPA 72/3034

Hauptteil des PrimärstroMe.s über diesen fließt. Da bei einem kompensierten Stromwandler die sekundäre Mrdenleistung nicht von der Primärseite gedeckt werden muß, ist es möglich, den Primärstrom mittels des Shuntes so aufzuteilen, daß nur ein kleiner Anteil als Erregung für den Stromwandler wirksam wird, ohne daß diese Stromverteilung von sekundären Bürdenänderungen beeinflußt wird. Auf diese Weise lassen sich auch bei hohen Primärströmen genaue Stromwandler mit billigem Kernmaterial und preisgünstigen Verstärkern realisieren.Main part of the primary stream flows through this. There with one Current transformers did not compensate the secondary billions of power must be covered by the primary side, it is possible to divide the primary current by means of the shunt so that only one small portion as excitation for the current transformer becomes effective without this current distribution of secondary load changes being affected. In this way, even with high primary currents, accurate current transformers can be used cheaply Realize core material and inexpensive amplifiers.

Anhand der Zeichnung, in der ein Ausführungsbeispiel schematisch dargestellt ist, wird der Gegenstand der Erfindung näher erläutert.The subject of the invention is based on the drawing, in which an exemplary embodiment is shown schematically explained in more detail.

Mit 1 ist der Stromwandler und mit 2 der Verstärker bezeichnet, der die Bürdenleistung aufzubringen hat. Über die Klemmen 3 und 4· wird der Meßstrom der Primärwicklung W11 with the current transformer and 2 with the amplifier is designated, which has to provide the burden power. About the Terminals 3 and 4 · becomes the measuring current of the primary winding W1

u W3u W3

zugeführt. Mit W2#sind Sekundärwicklungen bezeichnet,, wobei die der Wicklung W1 gegenüberliegende Wicklung W2 die eigentliche Meßwicklung ist und die darunter liegende Wicklung W3 als indikatorwicklung dient. Die Indikatorwicklung W3 ist mit den Eingängen des Verstärkers 2 verbunden, während der Ausgang des Verstärkers mit der Meßwicklung W2 verbunden ist. Mit 5 ist die Wandlerbürde und mit 6 und 7 sind die sekundären Wandlerausgange bezeichnet.fed. Secondary windings are designated by W2 # , the winding W2 opposite the winding W1 being the actual measuring winding and the winding W3 underneath serving as the indicator winding. The indicator winding W3 is connected to the inputs of the amplifier 2, while the output of the amplifier is connected to the measuring winding W2. The converter burden is denoted by 5 and the secondary converter outputs are denoted by 6 and 7.

Der Verstärker 2 ist nun so ausgelegt, daß er die Bürdenleietuflg bei einem Primärstrom von max. 5 Amp. deckt. Verstärker dieser Leistung sind noch sehr preisgünstig. The amplifier 2 is now designed in such a way that it covers the burden conduction at a primary current of a maximum of 5 amps. Amplifiers of this power are still very inexpensive.

Um nun den elektronisch kompensierten Stromwandler auch bei höheren Primärströmen betreiben zu können, wird gemäß der Erfindung der Primärwicklung W1 ein Shunt θ parallel geschaltet, der so bemessen ist, daß beispielsweise bei einem -" Primärstrom von 60 Amp. über diesen 55 Amp. fließen, während die Primärwicklung W1 lediglich von einem Strom von 5 Amp. beaufschlagt wird. Eine derartige meßtechnische Maßnahme ist möglich, da die sekundäre Bürdenleistung nicht von der Primärseite gedeckt werden muß.In order to be able to operate the electronically compensated current transformer even at higher primary currents, according to the Invention of the primary winding W1 a shunt θ connected in parallel, which is dimensioned so that, for example, with a - " Primary current of 60 Amp. Flow over this 55 Amp., While the primary winding W1 only receives a current of 5 Amp. is applied. Such a metrological measure is possible because the secondary burden is not dependent on the Primary side must be covered.

309835/0646309835/0646

Claims (1)

PatentanspruchClaim Anordnung zur Vergrößerung des Meßbereiches von elektronisch kompensierten Stromwandlern, dadurch gekennzeichnet, daß der Primärwicklung des Stromwandlers ein Shunt von solcher Größe parallel geschaltet ist, daß der Hauptteil des Primärstromes über diesen fließt.Arrangement for enlarging the measuring range of electronically compensated current transformers, characterized in that the primary winding of the current transformer is connected in parallel with a shunt of such size that the main part of the primary current over this flows. 309835/0646309835/0646 LeerseiteBlank page
DE19722207610 1972-02-18 1972-02-18 ARRANGEMENT FOR INCREASING THE MEASURING RANGE OF ELECTRONICALLY COMPENSATED CURRENT CONVERTERS Pending DE2207610A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE19722207610 DE2207610A1 (en) 1972-02-18 1972-02-18 ARRANGEMENT FOR INCREASING THE MEASURING RANGE OF ELECTRONICALLY COMPENSATED CURRENT CONVERTERS
NL7301232A NL7301232A (en) 1972-02-18 1973-01-29
IT2032373A IT979055B (en) 1972-02-18 1973-02-13 ARRANGEMENT FOR ENLARGING THE MEASUREMENT FIELD OF CURRENT TRANSFORMERS WITH ELECTRONIC COMPENSATION
CH213573A CH553414A (en) 1972-02-18 1973-02-15 ARRANGEMENT FOR INCREASING THE MEASURING RANGE OF ELECTRONICALLY ERROR-COMPENSATED CURRENT CONVERTERS.
GB759573A GB1419023A (en) 1972-02-18 1973-02-15 Electronically-compensated current transformers
FR7305466A FR2172323A1 (en) 1972-02-18 1973-02-16
SE7302223A SE376803B (en) 1972-02-18 1973-02-16
ES411725A ES411725A1 (en) 1972-02-18 1973-02-17 Electronically-compensated current transformers
JP48020078A JPS4894828A (en) 1972-02-18 1973-02-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722207610 DE2207610A1 (en) 1972-02-18 1972-02-18 ARRANGEMENT FOR INCREASING THE MEASURING RANGE OF ELECTRONICALLY COMPENSATED CURRENT CONVERTERS

Publications (1)

Publication Number Publication Date
DE2207610A1 true DE2207610A1 (en) 1973-08-30

Family

ID=5836319

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19722207610 Pending DE2207610A1 (en) 1972-02-18 1972-02-18 ARRANGEMENT FOR INCREASING THE MEASURING RANGE OF ELECTRONICALLY COMPENSATED CURRENT CONVERTERS

Country Status (9)

Country Link
JP (1) JPS4894828A (en)
CH (1) CH553414A (en)
DE (1) DE2207610A1 (en)
ES (1) ES411725A1 (en)
FR (1) FR2172323A1 (en)
GB (1) GB1419023A (en)
IT (1) IT979055B (en)
NL (1) NL7301232A (en)
SE (1) SE376803B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3634221A1 (en) * 1986-10-08 1988-04-14 Bbc Brown Boveri & Cie ELECTRIC CONVERTER
CN113241245A (en) * 2021-05-10 2021-08-10 大连北方互感器集团有限公司 Current transformer with constant-value resistor and preparation method thereof

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2045952B (en) * 1979-03-15 1983-01-12 Tokyo Shibaura Electric Co Current transforming circuits
CH661814A5 (en) * 1983-06-01 1987-08-14 Landis & Gyr Ag MEASURING VOLTAGE CONVERTER HIGH ACCURACY.
US5107204A (en) * 1986-12-22 1992-04-21 General Electric Company Low temperature coefficient shunt for current measurement
FR2690993A1 (en) * 1992-05-06 1993-11-12 Europ Agence Spatiale Galvanically-isolated DC current pulse intensity measurement appts. e.g. for DC=DC converter or radar - has transformer with first sec. in parallel with resistor across which voltage is measured by amplifier, and second transformer sec. which is in series with further resistor and fed by amplifier output.
FR2704652B1 (en) * 1993-04-30 1995-06-23 Zellweger Sauter En Sa CURRENT SENSOR FOR ALTERNATING CURRENTS.
CN103000361A (en) * 2012-11-22 2013-03-27 南京江北自动化技术有限公司 Current transformer
GB2538816B (en) * 2015-05-26 2017-08-16 Secure Int Holdings Pte Ltd Electricity meter with isolated shunt

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3634221A1 (en) * 1986-10-08 1988-04-14 Bbc Brown Boveri & Cie ELECTRIC CONVERTER
CN113241245A (en) * 2021-05-10 2021-08-10 大连北方互感器集团有限公司 Current transformer with constant-value resistor and preparation method thereof
CN113241245B (en) * 2021-05-10 2022-03-11 大连北方互感器集团有限公司 Current transformer with constant-value resistor and preparation method thereof

Also Published As

Publication number Publication date
SE376803B (en) 1975-06-09
JPS4894828A (en) 1973-12-06
CH553414A (en) 1974-08-30
IT979055B (en) 1974-09-30
NL7301232A (en) 1973-08-21
GB1419023A (en) 1975-12-24
ES411725A1 (en) 1976-01-01
FR2172323A1 (en) 1973-09-28

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