EP0561717B1 - Combine de mesure à capteur de courant et transformateur d'alimentation - Google Patents

Combine de mesure à capteur de courant et transformateur d'alimentation Download PDF

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Publication number
EP0561717B1
EP0561717B1 EP93420101A EP93420101A EP0561717B1 EP 0561717 B1 EP0561717 B1 EP 0561717B1 EP 93420101 A EP93420101 A EP 93420101A EP 93420101 A EP93420101 A EP 93420101A EP 0561717 B1 EP0561717 B1 EP 0561717B1
Authority
EP
European Patent Office
Prior art keywords
secondary winding
magnetic circuit
current sensor
orifice
assembly according
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 - Lifetime
Application number
EP93420101A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0561717A1 (fr
Inventor
Pierre Schueller
Pierre Laffont
Pascal Houbre
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.)
Schneider Electric SE
Original Assignee
Schneider Electric SE
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0561717A1 publication Critical patent/EP0561717A1/fr
Application granted granted Critical
Publication of EP0561717B1 publication Critical patent/EP0561717B1/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
    • 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
    • H01F2038/305—Constructions with toroidal magnetic core

Definitions

  • the invention relates to a combined measurement formed by the association of a non-magnetic toroid current sensor having a first secondary winding intended to deliver a measurement signal proportional to the derivative of the current flowing through a common primary conductor passing through an orifice , and a supply transformer comprising a magnetic circuit made of ferromagnetic material, which is crossed by said primary conductor, and carrying a second secondary winding capable of supplying supply energy, in particular to an electronic trip device of an electric circuit breaker .
  • the object of the invention is to reduce the size of a measuring instrument for a trigger with own current.
  • the measuring instrument is characterized in that the current sensor is placed inside the magnetic circuit of the supply transformer with a coaxial arrangement around the orifice, and that the first secondary winding is located closer to the primary conductor than the second secondary winding, which is located in an area with a weak magnetic field.
  • This arrangement of the current sensor makes it possible to obtain a maximum measurement signal at the terminals of the first secondary winding, while the second secondary winding is arranged to limit the secondary intensity of the supply transformer in the event of the appearance of a current. short circuit in the primary conductor.
  • the magnetic circuit is arranged in a closed frame having a rectilinear branch for supporting the second secondary winding, which extends orthogonally to the orifice for the passage of the primary conductor.
  • the magnetic circuit opposite to the straight branch, a part in the shape of a vault, the internal wall of which is in the vicinity of the current sensor.
  • the handset is protected by an insulating carcass formed by the assembly of two half-shells coming into abutment in the median plane of symmetry.
  • Figure 1 is an elevational view of the measuring instrument according to the invention.
  • Figure 2 shows a sectional view along line 2-2 of Figure 1.
  • FIG. 3 represents a mode of installation of the measuring instrument on a primary conductor in a loop.
  • Figure 4 shows the handset inserted into a compartment of a circuit breaker box.
  • the combined instrument 10 is formed by the association of a current sensor 12 and a power transformer 14, arranged around an orifice 13 capable of being traversed by a conductor primary 15.
  • the latter is common to the sensor 12 and to the transformer 14, and is formed by a phase conductor of an electrical device with electronic trigger (not shown).
  • the current sensor 12 of the handset 10 comprises a closed non-magnetic toroid 16 of the Rogowski type, on which is wound a first secondary winding 18 intended to deliver a measurement signal to a processing circuit (not shown) of the trip device.
  • the low power measurement signal is proportional to the derivative of the current flowing through the primary conductor 15.
  • the adjacent supply transformer 14 comprises a magnetic circuit 20 made of ferromagnetic material, and a second secondary winding 22 intended to apply the supply voltage to the electronic trip device.
  • the magnetic circuit 20 is formed by a closed frame having at the base a rectilinear branch on which is wound the second secondary winding 22 extending orthogonally to the circular orifice 13.
  • the frame is constituted by two stacks of magnetic sheets assembled symmetrically with respect to the median plane of trace symmetry xx '.
  • the upper vaulted part of the frame has a semi-circular shape substantially centered on the axis yy 'of the orifice 13.
  • the instrument panel 10 is protected by the assembly of two half-shells 24.26 in molded insulating material, intended to ensure isolation from the surrounding environment.
  • the half-shells 24, 26 come into abutment in the median plane of symmetry.
  • the first secondary winding 18 of the sensor 12 is formed by a succession of contiguous turns distributed over the entire periphery of the non-magnetic core 16.
  • the wound toroid 16 is placed inside the magnetic circuit 20 of the transformer 14 with a coaxial arrangement around the orifice 13 for the passage of the primary conductor 15.
  • the toroid assembly 16 and the first secondary winding 18 extends orthogonally to the second secondary winding 22 by matching the inside of the upper vaulted portion of the magnetic circuit 20.
  • the non-magnetic torus 16 of the current sensor 12 directly surrounds the primary conductor 15 to obtain at the terminals of the first secondary winding 18, a maximum measurement signal as a function of a predetermined primary current.
  • the second secondary winding 22 of the supply transformer 14 is further from the primary conductor 15 than the toroid 16 and is in an area of weak magnetic field. This results in a limitation of the intensity supplied by the winding 22 in the event of a short-circuit current appearing in the primary conductor 15.
  • the primary conductor 15 is shaped according to a loop 28, with an arrangement of the second secondary winding 22 outside the loop.
  • the measuring device 10 is inserted into a compartment 30 of parallelepiped shape of an insulating box for the electrical equipment.
  • the upper vaulted part of the magnetic circuit 20 leaves two free spaces 32, 34 in the corners of the compartment 30 allowing the winding for several passages of the primary conductor 15 in the orifice 13.
  • the section of the primary conductor 15 corresponds to ratings less than 100 Amps.
  • the space occupied by the measuring device 10 in a molded switchgear box, in particular of a circuit breaker with electronic trip device with its own current, is reduced to a minimum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Transformers For Measuring Instruments (AREA)
EP93420101A 1992-03-19 1993-03-05 Combine de mesure à capteur de courant et transformateur d'alimentation Expired - Lifetime EP0561717B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9203435A FR2688931B1 (fr) 1992-03-19 1992-03-19 Combine de mesure a capteur de courant et transformateur d'alimentation.
FR9203435 1992-03-19

Publications (2)

Publication Number Publication Date
EP0561717A1 EP0561717A1 (fr) 1993-09-22
EP0561717B1 true EP0561717B1 (fr) 1996-09-04

Family

ID=9427937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93420101A Expired - Lifetime EP0561717B1 (fr) 1992-03-19 1993-03-05 Combine de mesure à capteur de courant et transformateur d'alimentation

Country Status (5)

Country Link
US (1) US5382896A (ja)
EP (1) EP0561717B1 (ja)
JP (1) JP3249228B2 (ja)
DE (1) DE69304377T2 (ja)
FR (1) FR2688931B1 (ja)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6018239A (en) * 1996-10-23 2000-01-25 General Electric Company Self-powered axial current sensor
DE19706019A1 (de) * 1997-02-07 1998-08-13 Siemens Ag Niederspannungs-Leistungsschalter mit wahlweise einbaubarem Meßwandler
US6608741B1 (en) * 2000-03-04 2003-08-19 Pass & Seymour, Inc. Two winding resonating arc fault sensor which boosts arc fault signals while rejecting arc mimicking noise
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.
FR2870350B1 (fr) * 2004-05-13 2006-07-14 Schneider Electric Ind Sas Dispositif de mesure d'un courant electrique, capteur de courant, declencheur electrique et dispositif de coupure comportant un tel dispositif de mesure
CN102136358B (zh) 2011-01-13 2012-12-19 上海诺雅克电气有限公司 电子式保护用供电电流互感器
JP6492693B2 (ja) * 2015-01-27 2019-04-03 富士電機機器制御株式会社 電流センサユニット
DE102016123953A1 (de) * 2016-12-09 2018-06-14 Eaton Industries (Austria) Gmbh Schaltschrank

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR427948A (fr) * 1910-04-01 1911-08-17 Edward Barnwell Howland Agrafe de fermeture pour corsets et autres objets similaires
FR734768A (fr) * 1931-03-04 1932-10-28 Delle Atel Const Electr Perfectionnements aux transformateurs d'intensité dans l'air pour tensions élevées
DE1638625A1 (de) * 1967-12-15 1971-09-30 Siemens Ag Stromwandler
DE2363931C3 (de) * 1973-12-20 1979-08-02 Siemens Ag, 1000 Berlin Und 8000 Muenchen Strommeßeinrichtung
US4059798A (en) * 1976-03-08 1977-11-22 F. W. Bell, Inc. Method and apparatus for measuring the current flowing in a workpiece
DE2711193A1 (de) * 1977-03-15 1978-09-21 Ritz Messwandler Kg Stromwandler-innenkern
US4140961A (en) * 1977-06-21 1979-02-20 Mitsubishi Denki Kabushiki Kaisha Shunt circuit for an insulation type current transformer to adapt to a wide-band of frequency
US4262209A (en) * 1979-02-26 1981-04-14 Berner Charles A Supplemental electrical power generating system
US4540939A (en) * 1982-04-16 1985-09-10 Lucas Industries Public Limited Company Apparatus for monitoring current levels in an a.c. transmission line
FR2599195B1 (fr) * 1986-05-26 1992-10-30 Merlin Gerin Capteur de courant pour un declencheur statique

Also Published As

Publication number Publication date
EP0561717A1 (fr) 1993-09-22
DE69304377D1 (de) 1996-10-10
FR2688931B1 (fr) 1995-07-07
JP3249228B2 (ja) 2002-01-21
US5382896A (en) 1995-01-17
DE69304377T2 (de) 1997-02-20
JPH0689823A (ja) 1994-03-29
FR2688931A1 (fr) 1993-09-24

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