EP0222687A2 - Transformateur de courant pour un disjoncteur de protection - Google Patents

Transformateur de courant pour un disjoncteur de protection Download PDF

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Publication number
EP0222687A2
EP0222687A2 EP86730166A EP86730166A EP0222687A2 EP 0222687 A2 EP0222687 A2 EP 0222687A2 EP 86730166 A EP86730166 A EP 86730166A EP 86730166 A EP86730166 A EP 86730166A EP 0222687 A2 EP0222687 A2 EP 0222687A2
Authority
EP
European Patent Office
Prior art keywords
current transformer
intermediate part
core
end parts
busbar
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.)
Granted
Application number
EP86730166A
Other languages
German (de)
English (en)
Other versions
EP0222687A3 (en
EP0222687B1 (fr
Inventor
William E. May
Ronald W. Mckinney
James S. Wells
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
Publication of EP0222687A2 publication Critical patent/EP0222687A2/fr
Publication of EP0222687A3 publication Critical patent/EP0222687A3/de
Application granted granted Critical
Publication of EP0222687B1 publication Critical patent/EP0222687B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • 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
    • H01F27/02—Casings
    • H01F27/027—Casings specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards

Definitions

  • the invention relates to a current transformer for a circuit breaker with a busbar serving as the primary winding of the current transformer and penetrating its core, which has two end parts serving for connection to further conductors and an intermediate part located between the end parts and penetrating the core.
  • the object of the invention is to reduce the dimensions of the current transformer to such an extent that it practically does not exceed the width of the associated conductor rail and, furthermore, additional heating remains as low as possible.
  • the intermediate part is arranged to run transversely to the longitudinal direction of the busbar and is connected at its ends to the mutually facing sides of the end parts and in that the intermediate part is arranged at a distance from the end parts suitable for passage through the core .
  • the core of the current transformer is in a position rotated by 90 ° with respect to the known arrangements. It can therefore no longer withstand the width of the busbar. It is therefore no longer necessary to reduce the width of the intermediate part, which also results in less heat loss.
  • the aforementioned distance of the intermediate part from the end parts allows the core of the current transformer to be supported on one end part or on both end parts.
  • the end parts are arranged flush with one another at an end face distance and that the intermediate part is connected by a connecting part to the side face of the one end part and on its opposite side by a further connecting part to the opposite side surface of the other end part is connected.
  • This arrangement can be produced from individual parts as well as coherently.
  • the intermediate part be arranged approximately symmetrically overlapping a parting line between the end parts and the connecting parts with a reduced width compared to the area of the intermediate part intended for passage through the core is trained.
  • the reduced width of the connecting parts means that the intermediate part is only connected to the side surface of one end part and the current can thus only pass from the one end part to the other end part of the busbar via the intermediate part. Since these narrower connecting parts can be short, there are only minor losses. The additional heating is accordingly low and occurs in places with good heat emission.
  • the end parts, the intermediate part and the connecting parts can be formed in one piece as a bendable sheet metal part. This makes it possible to maintain the previous method of manufacturing busbars for current transformers, although the direction of the current flow through the busbar runs differently than in the known current transformers.
  • the new current transformer is equally suitable for embodiments with one secondary winding or with two secondary windings. If two secondary windings are required, the intermediate part can be dimensioned and arranged for the passage between the secondary windings.
  • FIG. 8 shows a section along the line VIII-VIII in FIG. 7.
  • FIG. 9 shows a stamped part made of copper sheet before it is formed into a busbar.
  • the current transformer 10 is provided for supplying an electronic trip unit of a circuit breaker with an insulating housing (type MCCB) and has a core 12 and a secondary winding 14.
  • the core 12 preferably consists of layered soft magnetic steel sheets which form a window for the passage of the secondary winding.
  • the secondary winding 14 surrounds one leg of the core 12 and extends through the window mentioned in such a way that the winding 14 surrounds the core 12.
  • the current transformer 10 has a busbar 16 which also has a section which penetrates the window of the core 12. In this way, a magnetic flux in the core 12 is excited by the current flowing through the bus bar.
  • two secondary windings can also be provided in a manner to be described.
  • the busbar 16 has a first end part 20 and a second end part 22, which are preferably flat and designed in a suitable manner for connection to an external connection device or a conductor leading into the interior of the circuit breaker , e.g. B. can be provided with through openings.
  • the first end part 20 of the busbar 14 has mutually opposite side faces 26 and 28.
  • the second end part 22 has side faces 32 and 34.
  • the side faces 28 and 34 or 26 and 32 are located on the same side of the busbar 16 in each case FIGS. 2 and 3 show that the busbar 16 has an outer end surface 24 at the end of the end part 20 and the end part 22 has an outer end surface 30.
  • the end parts 20 and 22 with inner end surfaces 25 and 31 are at a distance 36 from one another. Both end parts are conductively connected to one another by an intermediate part 38 which has a first angled leg 39 and a second angled leg 40.
  • the first angled leg 39 is connected to the end part 20 in the region of the first side surface 26 of the end part 20 via a first connecting part 42
  • the opposite angled leg 40 of the intermediate part 38 is connected to the side surface 34 of the second end part 22 via a second connecting part 44 connected is.
  • the connection at diagonally opposite points ensures that the direction of the current in the intermediate part 38 is approximately at right angles to the current direction in the busbar 16 as a whole. This is illustrated in FIG. 2 by the double arrow 18 for the current direction between the end parts 20 and 22 and the arrow 48 at right angles to this for the direction of the current in the intermediate part 38.
  • the current transformer can also have two secondary windings.
  • a corresponding exemplary embodiment is shown in FIGS. 7 and 8.
  • the current transformer 50 has a core 52 on the opposite legs of which a first secondary winding 54 and a second secondary winding 56 are attached.
  • the associated busbar 58 which forms the primary winding has a structure which in principle corresponds to the exemplary embodiment described above.
  • the intermediate part 60 connecting the end parts of the busbar 58 is provided with long angled legs 62 and 64 that the intermediate part 60 can pass between the two secondary windings 54 and 56. Accordingly, it is not the core of the current transformer that rests on the end parts of the busbar 58, but the lower secondary winding 54.
  • the exemplary embodiment according to FIGS. 7 and 8 also has the advantageous property of a small overall width compared to conventional current transformers.
  • the busbars 16 and 58 can be produced from a suitable conductor material by an extrusion process. By such a method, the conductor material is shaped into the desired hollow cross-sectional configuration and the excess material is cut away to form the end parts 20 and 22. Additional processing electrically separates the two end parts 20 and 22 and only leaves the connection to the connecting part 38.
  • the busbar 16 or 58 can be made of sheet metal.
  • a sheet metal part 66 can be cut out of copper sheet in accordance with FIG. 9 and then shaped into the desired shape by simple bending processes.
  • the sections provided with the dimension 46 form the connecting parts 42 and 44 according to FIGS. 2 and 4.
  • the stamping and bending process has the advantage of being quick to carry out.
  • extrusion can produce a busbar with more narrow tolerances.
EP86730166A 1985-11-08 1986-10-20 Transformateur de courant pour un disjoncteur de protection Expired - Lifetime EP0222687B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/796,562 US4630018A (en) 1985-11-08 1985-11-08 Molded case circuit breaker current transformer with spiral bus
US796562 1985-11-08

Publications (3)

Publication Number Publication Date
EP0222687A2 true EP0222687A2 (fr) 1987-05-20
EP0222687A3 EP0222687A3 (en) 1987-12-16
EP0222687B1 EP0222687B1 (fr) 1991-01-02

Family

ID=25168491

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86730166A Expired - Lifetime EP0222687B1 (fr) 1985-11-08 1986-10-20 Transformateur de courant pour un disjoncteur de protection

Country Status (6)

Country Link
US (1) US4630018A (fr)
EP (1) EP0222687B1 (fr)
AU (1) AU580941B2 (fr)
BR (1) BR8605527A (fr)
CA (1) CA1265217A (fr)
DE (1) DE3676446D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6603381B2 (en) * 2001-08-13 2003-08-05 General Electric Company Primary conductor for a transformer
ITBG20030062A1 (it) * 2003-12-30 2005-06-30 Abb Service Srl Dispositivo di alimentazione per un dispositivo di protezione elettronico da impiegarsi in un interruttore di bassa tensione.
US7649434B2 (en) * 2006-01-31 2010-01-19 Virginia Tech Intellectual Properties, Inc. Multiphase voltage regulator having coupled inductors with reduced winding resistance

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE934842C (de) * 1953-02-28 1955-11-03 Purrmann & Herr G M B H Aus Vollkupferleiter bestehende, zusammensetzbare Primaerwicklung fuer Stromwandler
FR1256641A (fr) * 1960-02-11 1961-03-24 Compteurs Comp D Perfectionnements aux transformateurs de courant
DE1253353B (de) * 1962-10-12 1967-11-02 Messwandler Bau Gmbh Wickelstromwandler mit einer aus Flachband hergestellten Primaerwicklung
US4591942A (en) * 1984-12-07 1986-05-27 General Electric Company Current sensing transformer assembly

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US508620A (en) * 1893-11-14 Field-magnet coil and method of manufacturing same
DE20818C (de) * F. REIMHERR in Dortmund Rauchverbrennungsvorrichtung für Lekomotiven und Schiffskessel
US662162A (en) * 1899-04-22 1900-11-20 Charles A Balph Fireproof construction.
US691404A (en) * 1901-03-14 1902-01-21 Henry E Meyers Portable electric welding-machine.
US1022880A (en) * 1908-09-11 1912-04-09 Gen Electric Current-transformer.
US1722444A (en) * 1925-10-28 1929-07-30 Reiche Willi Connecting transformer of the shell type
US2246167A (en) * 1940-03-16 1941-06-17 Gen Electric Transformer
US2715669A (en) * 1951-01-29 1955-08-16 Allen A Dicke Electric soldering tool
FR1308052A (fr) * 1961-09-22 1962-11-03 Comp Generale Electricite Enroulement pour transformateur
DE1488371B2 (de) * 1964-09-19 1970-02-05 Siemens AG, 1000 Berlin u. 8000 München Freiluft-Hochströltransformator
US3629761A (en) * 1970-05-01 1971-12-21 Motorola Inc Broadband high-frequency transformer
US3761776A (en) * 1972-12-26 1973-09-25 Gen Electric Multi-phase electric circuit breaker
US3826967A (en) * 1973-05-29 1974-07-30 Pioneer Magnetics Inc Low leakage secondary circuit for a power transformer including conductive strips forming the secondary and connections for rectifying diodes
US4159457A (en) * 1977-10-25 1979-06-26 Burroughs Corporation Low voltage high current transformer
US4181389A (en) * 1978-09-13 1980-01-01 General Electric Company Tap changing electrical connector for static trip circuit breakers
US4281359A (en) * 1980-03-14 1981-07-28 General Electric Company Static trip unit for molded case circuit breakers
CH660538A5 (de) * 1983-03-02 1987-04-30 Landis & Gyr Ag Messwandler zum messen eines stromes.
CH660537A5 (de) * 1983-03-02 1987-04-30 Landis & Gyr Ag Messwandler zum messen eines stromes.
ATE59480T1 (de) * 1986-09-29 1991-01-15 Landis & Gyr Betriebs Ag Messwandler zum messen des in einem elektrischen leiter fliessenden stromes.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE934842C (de) * 1953-02-28 1955-11-03 Purrmann & Herr G M B H Aus Vollkupferleiter bestehende, zusammensetzbare Primaerwicklung fuer Stromwandler
FR1256641A (fr) * 1960-02-11 1961-03-24 Compteurs Comp D Perfectionnements aux transformateurs de courant
DE1253353B (de) * 1962-10-12 1967-11-02 Messwandler Bau Gmbh Wickelstromwandler mit einer aus Flachband hergestellten Primaerwicklung
US4591942A (en) * 1984-12-07 1986-05-27 General Electric Company Current sensing transformer assembly

Also Published As

Publication number Publication date
DE3676446D1 (de) 1991-02-07
EP0222687A3 (en) 1987-12-16
AU580941B2 (en) 1989-02-02
US4630018A (en) 1986-12-16
AU6491086A (en) 1987-05-14
BR8605527A (pt) 1987-08-11
CA1265217A (fr) 1990-01-30
EP0222687B1 (fr) 1991-01-02

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