DK0400343T3 - Electricity generator with improved accuracy - Google Patents

Electricity generator with improved accuracy

Info

Publication number
DK0400343T3
DK0400343T3 DK90108288.3T DK90108288T DK0400343T3 DK 0400343 T3 DK0400343 T3 DK 0400343T3 DK 90108288 T DK90108288 T DK 90108288T DK 0400343 T3 DK0400343 T3 DK 0400343T3
Authority
DK
Denmark
Prior art keywords
current
converter
comparator
winding
difference
Prior art date
Application number
DK90108288.3T
Other languages
Danish (da)
Inventor
Frank Dipl-Ing Herrmann
Original Assignee
Deutsche Zaehler Gmbh
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 Deutsche Zaehler Gmbh filed Critical Deutsche Zaehler Gmbh
Application granted granted Critical
Publication of DK0400343T3 publication Critical patent/DK0400343T3/en

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Control Of Eletrric Generators (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Dc-Dc Converters (AREA)

Abstract

In order to provide a current transformer with increased precision, in which a comparator converter (11; 22) and a power converter (13; 24) are located in series with their primary windings (10, 12; 21, 13) in a main circuit, in which a compensation current of a winding (16; 36) of the comparator converter (11; 22) is supplied from a secondary winding (17; 18) of the power converter (13; 24) in order to reduce the magnetisation of the core of the comparator converter (11; 22), and in which an indicator winding (19; 36) of the comparator converter (11; 22) emits a difference signal corresponding to the remaining magnetic flux, which signal is amplified (at 20; 37) and is supplied as a difference current of another winding (16; 38) of the comparator converter (11; 22), the sum of the compensation current (I1; I3) and of the difference current (I2; I4) forming the output signal, such that a high precision can be achieved both in the case of alternating current as well as in the case of pulsating direct current, with a cost-effective design, it is proposed that the power converter (24) also transmits a component, corresponding to the direct current component of the main current (Ih), in the first compensation current (I3). <IMAGE>
DK90108288.3T 1989-06-02 1990-05-01 Electricity generator with improved accuracy DK0400343T3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3918100A DE3918100A1 (en) 1989-06-02 1989-06-02 CURRENT TRANSFORMER ARRANGEMENT WITH INCREASED ACCURACY

Publications (1)

Publication Number Publication Date
DK0400343T3 true DK0400343T3 (en) 1993-08-23

Family

ID=6381981

Family Applications (1)

Application Number Title Priority Date Filing Date
DK90108288.3T DK0400343T3 (en) 1989-06-02 1990-05-01 Electricity generator with improved accuracy

Country Status (4)

Country Link
EP (1) EP0400343B1 (en)
AT (1) ATE91566T1 (en)
DE (2) DE3918100A1 (en)
DK (1) DK0400343T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10311441B4 (en) * 2003-03-15 2005-03-10 Emh Elek Zitaetszaehler Gmbh & Electronic electricity meter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3783869D1 (en) * 1986-11-11 1993-03-11 Siemens Ag FLOW-COMPENSATED CURRENT TRANSFORMER.
DE3705450A1 (en) * 1987-02-20 1988-09-01 Vacuumschmelze Gmbh Current transformer for measuring rectangular waveform currents using the compensation principle

Also Published As

Publication number Publication date
DE3918100C2 (en) 1992-07-16
EP0400343B1 (en) 1993-07-14
DE59001950D1 (en) 1993-08-19
ATE91566T1 (en) 1993-07-15
DE3918100A1 (en) 1990-12-06
EP0400343A1 (en) 1990-12-05

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