EP0144347B1 - Aktiver stromwandler - Google Patents

Aktiver stromwandler Download PDF

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Publication number
EP0144347B1
EP0144347B1 EP84901762A EP84901762A EP0144347B1 EP 0144347 B1 EP0144347 B1 EP 0144347B1 EP 84901762 A EP84901762 A EP 84901762A EP 84901762 A EP84901762 A EP 84901762A EP 0144347 B1 EP0144347 B1 EP 0144347B1
Authority
EP
European Patent Office
Prior art keywords
winding
current
current transformer
transformer according
tube portion
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
EP84901762A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0144347A1 (de
Inventor
Richard Friedl
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 Building Technologies AG
Deutsche Zaehler-Gesellschaft Nachf A Stepper & Co (gmbh & Co)
Original Assignee
LGZ Landis and Gyr Zug AG
Deutsche Zaehler-Gesellschaft Nachf A Stepper & Co (gmbh & Co)
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 LGZ Landis and Gyr Zug AG, Deutsche Zaehler-Gesellschaft Nachf A Stepper & Co (gmbh & Co) filed Critical LGZ Landis and Gyr Zug AG
Priority to AT84901762T priority Critical patent/ATE23412T1/de
Publication of EP0144347A1 publication Critical patent/EP0144347A1/de
Application granted granted Critical
Publication of EP0144347B1 publication Critical patent/EP0144347B1/de
Expired legal-status Critical Current

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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

Definitions

  • the invention relates to an active current transformer of the type specified in the preamble of claim 1.
  • the primary winding generates significantly larger floods than converters equipped with a ferromagnetic core require for the magnetic core to function properly.
  • transducers are known whose magnetic core comprises only a part of the conductor cross section carrying the measuring current. Particular problems arise with regard to the relatively large temperature dependency and the need to eliminate principle-related phase errors between the primary and secondary currents by special measures.
  • an active current transformer in which the current to be measured is divided into two separate conductors which are wound in opposite directions to form the primary winding and whose resistance values differ from one another (DE-A-31 40 544).
  • active current transformers which completely dispense with ferromagnetic cores (DE-A-28 12 303) and in which the secondary winding is designed as a toroid through which the primary conductor carrying the measuring current passes.
  • the invention has for its object to provide a current transformer which, compared to the known arrangements with at least the same metrological properties, can be constructed more simply and manufactured more cost-effectively.
  • the current transformation ratio is not determined exclusively by the ratio of the number of turns of the primary and secondary windings, but also to a considerable extent by the coupling factor, which indicates the ratio of partial flow to total flow.
  • the coupling factor which indicates the ratio of partial flow to total flow.
  • the current error is also compensated for in the new converter in a known manner by selecting a suitable amplification.
  • the coupling factor is achieved by a sufficiently large geometric distance between the primary and detector windings or secondary windings.
  • the coupling factor is also influenced by the permeability of these materials.
  • the current converter according to the invention with a high current ratio is distinguished from the known arrangements primarily by further considerable simplifications, by insensitivity to temperature changes and by low phase errors. Further advantages are the possibility of simply assembling the primary conductor with the other necessary components by introducing (inserting) these parts into the magnetic field of the current flowing in the primary conductor, so that, for example, these components can also be replaced without having to open the primary circuit, and the unrestricted function in the presence of DC components in the primary and secondary circuit.
  • the use of the arrangement according to the invention with the known circuits of digital ' flux compensation in the secondary circuit and the known blanking of the magnetic flux with sawtooth signals is particularly suitable since the frequency of the measurement cycles is chosen to be relatively high due to the low impedance of the secondary winding can.
  • the new current transformer can be equipped with or without ferromagnetics.
  • the new converter is particularly suitable for use in electricity meters for single and multi-phase alternating current.
  • 1 a represents the invention in the most general way. It concerns the arrangement of a mutual inductor, consisting of a primary winding 1 carrying the alternating current 1 1 to be measured with the number of turns W 1 , through the surface of which the magnetic flux 0 1 passes, and a detector winding 3, which is crossed by the partial flow 0 13 , ie by a part of the flow 0 1 , while the other part 0 11 does not pass through the winding 3 as a stray flux.
  • a secondary winding 2 with the number of turns W 2 is relatively firmly coupled to the winding 3.
  • the voltage induced in the detector winding 3 is fed to an amplifier arrangement V which builds up a current 1 2 in the secondary winding 2 such that the partial flow 0 13 , which passes through the detector winding 3, is usually completely compensated for with usually high amplification, the coupling factor not being influenced by the amplification.
  • the secondary measuring current 1 2 is then very precisely proportional to the current 1 1 to be measured in the winding 1.
  • the transformer has a flat conductor 1 carrying the current to be measured, which is provided with current leads 4 and 5 and forms the primary winding 1 with only one turn W 1 .
  • the flat conductor 1 a encloses a tube section 6 made of ferromagnetic material, which in turn concentrically comprises a cylindrical ferromagnetic core rod 7 also made of ferromagnetic material, on which the windings 3 and 2 are applied.
  • the ferromagnetic core rod 7 with the windings 3 and 2 is opposite to that Pipe section 6 in the annular space 8 either filled with insulation or fixed by other mechanical means.
  • the arrangement works as follows: The magnetic field generated by the current 1 1 to be measured is divided in the cylindrical primary winding 1 by the ferromagnetic tube section 6 and the ferromagnetic core rod 7 into two magnetic fluxes, the relationship of which largely depends on the magnetic conductivities of the two ferromagnetic Parts 6 and 7 is determined. Consequently, with the same ferromagnetic material (for example ferrite material) and radially symmetrical arrangement of the core rod 7 in the tube section 6 with the same length of the parts 6 and 7, the division ratio of the magnetic fluxes and thus the coupling factor K largely depends on the ratio of the radial axis perpendicular to the tube or rod longitudinal axis Cut surfaces determined. The coupling factor K can be further reduced by shortening the core rod 7 while maintaining the length of the tube section 6. The coupling factor can also be changed by moving the core rod 7 in its longitudinal direction.
  • a reduction in the coupling factor according to FIGS. 3a and 3b can also be achieved in that the core rod 7 with the windings 3 and 2 is opposite the Pipe section 6 rotates into an angular position, so that the winding 3 passes through only part of the maximum detectable magnetic flux.
  • FIG. 4 shows one of many possibilities of how the coupling factor for an arrangement according to FIG. 2 can be finely adjusted.
  • An annular ferromagnetic sheet 10 with a radially inwardly directed nose 10a is placed on an end face of the tube section 6.
  • a ferromagnetic sheet metal flag 11 is pivotally attached, which increases the coupling factor when approaching the nose 10a of the sheet 10 and decreases when turning away.
  • FIG. 5 shows an embodiment for fine adjustment according to FIG. 5, in that a ferromagnetic sheet metal flag 12 is rotatably mounted eccentrically to the pipe section 6 on or near the pipe section 6 and is rotated over the field that emerges from the pipe section 6 until the desired translation is available.
  • ferromagnetic screws 13 there is the possibility of using ferromagnetic screws 13 to delicately influence the field profile and thus the flow distribution between the tube section 6 and the core rod 7 (FIG. 5).
  • Residual phase errors can be compensated for by suitable loading of the partial flows with metal parts in which eddy currents arise.
  • a ferrite cylinder or pot can be pushed over this winding, which is slotted on the jacket side for the passage of the current leads 4 and 5.
  • the lengths of the tube section 6 and the core rod 7 with the windings 3 and 2 are shorter than the axial length of the cylindrical primary winding 1 formed by the flat conductor 1 and the bull-side ends of the primary winding 1 with cresiform ferromagnetic covers 16 and 17 to complete, these covers being held at a distance from the ferromagnetic parts 6 and 7 via the non-magnetic disks 14 and 15.
  • all the parts located within the ring section of the flat conductor 1 a - possibly including electronic elements - can be pushed into the conductor tube as a common block.
  • the primary winding 1, the windings 2 and 3, the tube section 6 and the rod core 7 in a largely closed, advantageously cylindrical shielding pot made of ferromagnetic material according to FIGS. 8a and 8b.
  • the shielding pot advantageously consists of two shell halves 18 and 19, the contact surfaces 20 of the two shell halves 18 and 19, the longitudinal axis of the shielding pot 18, 19 and thus also the longitudinal axis of the tube section 6 (FIG. 2) lying in a common plane.
  • the two shell halves 18 and 19 are provided with cutouts 21 and 22 for carrying out the current leads 4, 5 (FIG. 2) of the flat conductor 1a and the connections of the windings 2 and 3.
  • the shell halves 18 and 19 are folded over the current transformer described. In this way, the inner converter part can be replaced at the operating location even with current-carrying flat conductor 1.
  • FIG. 9a and 9b show an embodiment of a cylindrical shielding pot consisting of two shell parts 23 and 24, in which the contact surfaces 25 of the two shell parts 23 and 24 lie in one with respect to the longitudinal axis of the shielding pot 23, 24 and thus to the longitudinal axis of the tube section 6 (FIG. 2) vertical plane.
  • the shell part 23 is designed as a pot and the shell part 24 as a lid.
  • a tubular pin 26 or 27 is formed on the inside of the circular end face of the shell part 23 or 24.
  • These pipe journals 26 and 27 together form the pipe section 6 (FIG. 2) for the purpose of flow division, an air gap 28 between the opposite end faces of the pipe journals 26, 27 ensuring shear of the magnetic circuit and thus preventing a magnetic short circuit.
  • the hollow cylindrical space 29 between the jacket of the shielding pot 23, 24 and the tubular pin 26, 27 serves to receive the primary winding 1 or the flat conductor 1a and the space 30 inside the tubular pin 26, 27 to accommodate the core rod 7, the secondary winding 2 and the detector winding 3.
  • a cut-out 31 is provided in the shielding pot 23, 24 for carrying out the current leads 4, 5 of the flat conductor 1 a and a cut-out 32 for carrying out the coil wires to the space 30.
  • the arrangement according to the invention is also suitable because of the low feed of a ferromagnetic material (iron powder, ferrite) for feeding a sawtooth signal of relatively high frequency into the winding 2, the zero crossings of the voltage at the detector winding in electronic multiplier arrangements using the so-called time division method 3 are immediately available as a duty cycle for controlling the second measurement variable.
  • a ferromagnetic material iron powder, ferrite

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
EP84901762A 1983-05-24 1984-04-27 Aktiver stromwandler Expired EP0144347B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84901762T ATE23412T1 (de) 1983-05-24 1984-04-27 Aktiver stromwandler.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3318749A DE3318749C2 (de) 1983-05-24 1983-05-24 Aktiver Stromwandler
DE3318749 1983-05-24

Publications (2)

Publication Number Publication Date
EP0144347A1 EP0144347A1 (de) 1985-06-19
EP0144347B1 true EP0144347B1 (de) 1986-11-05

Family

ID=6199709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84901762A Expired EP0144347B1 (de) 1983-05-24 1984-04-27 Aktiver stromwandler

Country Status (5)

Country Link
US (1) US4629974A (ja)
EP (1) EP0144347B1 (ja)
JP (1) JPS60501434A (ja)
DE (2) DE3318749C2 (ja)
WO (1) WO1984004849A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0335511A1 (en) * 1988-03-04 1989-10-04 Landis & Gyr Betriebs AG Active current transformer

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4894610A (en) * 1985-09-14 1990-01-16 LOZ Landis & Gyr Zug AG Current-transformer arrangement for an electrostatic meter
DE3540777A1 (de) * 1985-11-16 1987-05-21 Martin Dipl Ing Kahmann Elektronische zusatzschaltung fuer wechselstromwandler
FR2638235B1 (fr) * 1988-10-21 1991-04-19 Robert Jean Procede et dispositifs pour generer un courant alternatif secondaire dont l'intensite est proportionnelle a celle d'un courant primaire et compteurs equipes de ces dispositifs
US5369355A (en) * 1992-11-12 1994-11-29 B/E Aerospace Compensation circuit for transformer linearization
DE10045194A1 (de) * 2000-09-13 2002-03-28 Siemens Ag Auswerteschaltung für einen Stromsensor nach dem Kompensationsprinzig, insbesondere zur Messung von Gleich- und Wechselströmen, sowie Verfahren zum Betrieb eines solchen Stromsensors
US7174261B2 (en) * 2003-03-19 2007-02-06 Power Measurement Ltd. Power line sensors and systems incorporating same
WO2006078944A2 (en) * 2005-01-19 2006-07-27 Power Measurement Ltd. Sensor apparatus
CN107037252B (zh) * 2017-03-29 2020-12-25 中国电力科学研究院 电子补偿式感应分流器

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191422248A (en) * 1914-11-09 1915-07-29 Oliver Imray Improvements in Electric Transformers.
GB198714A (en) * 1921-12-09 1923-06-11 Edouard Vedovelli Improvements in or relating to electric transformers
FR1463203A (fr) * 1965-11-05 1966-12-23 Perfectionnements aux transformateurs électriques réglables, notamment pour les travaux de soudure
CH476629A (fr) * 1968-03-12 1969-08-15 Suisse Des Explosifs Soc Installation pour le transport d'un explosif liquide
CH467505A (de) * 1968-03-14 1969-01-15 Landis & Gyr Ag Messwandler mit einstellbarem Übersetzungsverhältnis
SE397221B (sv) * 1973-06-05 1977-10-24 Siemens Ag Stromtransformator med elektronisk felkompensation, i synnerhet for elektroniska kwh-metare
DE2330048A1 (de) * 1973-06-13 1974-12-19 Siemens Ag Anordnung zur erfassung des laststromes fuer elektronische kwh-zaehler
DE2359756A1 (de) * 1973-11-30 1975-06-12 Siemens Ag Saettigungswandler
DE2802129A1 (de) * 1978-01-19 1979-07-26 Friedl Richard Nebenschlusstromwandler
DE2812303C2 (de) * 1978-03-21 1983-12-29 Deutsche Zähler-Gesellschaft Nachf. A. Stepper & Co (GmbH & Co), 2000 Hamburg Stromwandleranordnung mit elektronischer Fehlerkompensation
US4240059A (en) * 1979-04-05 1980-12-16 Westinghouse Electric Corp. Current divider for a current sensing transducer
DE3140544A1 (de) * 1981-10-13 1983-04-21 Richard Dr.-Ing. 3300 Braunschweig Friedl Aktiver stromsensor mit primaerer reduzierwicklung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0335511A1 (en) * 1988-03-04 1989-10-04 Landis & Gyr Betriebs AG Active current transformer

Also Published As

Publication number Publication date
JPS60501434A (ja) 1985-08-29
EP0144347A1 (de) 1985-06-19
DE3461233D1 (en) 1986-12-11
US4629974A (en) 1986-12-16
JPH0426530B2 (ja) 1992-05-07
DE3318749C2 (de) 1985-03-28
WO1984004849A1 (en) 1984-12-06
DE3318749A1 (de) 1984-11-29

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