EP0561717A1 - Measuring combination with current sensor and power supply transformer - Google Patents
Measuring combination with current sensor and power supply transformer Download PDFInfo
- Publication number
- EP0561717A1 EP0561717A1 EP93420101A EP93420101A EP0561717A1 EP 0561717 A1 EP0561717 A1 EP 0561717A1 EP 93420101 A EP93420101 A EP 93420101A EP 93420101 A EP93420101 A EP 93420101A EP 0561717 A1 EP0561717 A1 EP 0561717A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- secondary winding
- magnetic circuit
- measuring device
- current sensor
- primary conductor
- 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
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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 core 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 power 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 power supply, 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 arranged 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 an arch, the internal wall of which is in the vicinity of the current sensor.
- the protection of the handset is ensured 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 combined measurement device on a primary loop conductor.
- Figure 4 shows the handset inserted in a compartment of a circuit breaker box.
- the measuring device 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 includes 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 straight branch on which is wound the second secondary winding 22 extending orthogonally to the circular orifice 13.
- the frame consists of 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 interior 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 instrument 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)
Abstract
Description
L'invention est relative à un combiné de mesure formé par l'association d'un capteur de courant à tore amagnétique ayant un premier enroulement secondaire destiné à délivrer un signal de mesure proportionnel à la dérivée du courant parcourant un conducteur primaire commun traversant un orifice, et d'un transformateur d'alimentation comportant un circuit magnétique en matériau ferromagnétique, lequel est traversé par ledit conducteur primaire, et portant un deuxième enroulement secondaire susceptible de fournir une énergie d'alimentation, notamment à un déclencheur électronique d'un disjoncteur électrique.The invention relates to a combined measurement formed by the association of a non-magnetic core 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 power 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 power supply, in particular to an electronic trip device of an electric circuit breaker .
Un tel dispositif est connu du document FR-A-2-599.195 de la demanderesse, dans lequel le capteur de courant à tore de Rogowski, et le transformateur d'alimentation sont disposés côte à côte et coaxialement autour de la barre du conducteur primaire. Etant donné que la place réservée au déclencheur dans le boîtier du disjoncteur devient de plus en plus réduite, une disposition côte à côte du capteur et du transformateur devient inadéquate.Such a device is known from document FR-A-2-599.195 of the applicant, in which the Rogowski toroid current sensor and the power transformer are arranged side by side and coaxially around the bar of the primary conductor. As the space reserved for the trip unit in the circuit-breaker housing becomes more and more reduced, a side-by-side arrangement of the sensor and the transformer becomes inadequate.
L'objet de l'invention consiste à réduire l'encombrement d'un combiné de mesure pour un déclencheur à propre courant.The object of the invention is to reduce the size of a measuring instrument for a trigger with own current.
Le combiné de mesure est caractérisé en ce que le capteur de courant est disposé à l'intérieur du circuit magnétique du transformateur d'alimentation avec une disposition coaxiale autour de l'orifice, et que le premier enroulement secondaire est situé plus près du conducteur primaire que le deuxième enroulement secondaire, lequel est situé dans une zone à faible champ magnétique.The measuring instrument is characterized in that the current sensor is arranged 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.
Cette disposition du capteur de courant permet d'obtenir un signal de mesure maximum aux bornes du premier enroulement secondaire, alors que le deuxième enroulement secondaire est agencé pour limiter l'intensité secondaire du transformateur d'alimentation en cas d'apparition d'un courant de court-circuit dans le conducteur primaire.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.
Le circuit magnétique est agencé en cadre fermé ayant une branche rectiligne de support du deuxième enroulement secondaire, lequel s'étend orthogonalement à l'orifice de passage du conducteur primaire. Le circuit magnétique comporte à l'opposé de la branche rectiligne, une partie en forme de voûte, dont la paroi interne se trouve au voisinage du capteur de courant.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 an arch, the internal wall of which is in the vicinity of the current sensor.
La protection du combiné est assurée par une carcasse isolante formée par l'assemblage de deux demi-coquilles venant en aboutement dans le plan médian de symétrie.The protection of the handset is ensured by an insulating carcass formed by the assembly of two half-shells coming into abutment in the median plane of symmetry.
D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de réalisation de l'invention, donné à titre d'exemple non limitatif, et représenté aux dessins annexés, dans lesquels:Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention, given by way of nonlimiting example, and represented in the appended drawings, in which:
La figure 1 est une vue en élévation du combiné de mesure selon l'invention.Figure 1 is an elevational view of the measuring instrument according to the invention.
La figure 2 montre une vue en coupe selon la ligne 2-2 de la figure 1.Figure 2 shows a sectional view along line 2-2 of Figure 1.
La figure 3 représente un mode d'installation du combiné de mesure sur un conducteur primaire en boucle.FIG. 3 represents a mode of installation of the combined measurement device on a primary loop conductor.
La figure 4 montre le combiné inséré dans un compartiment d'un boîtier de disjoncteur.Figure 4 shows the handset inserted in a compartment of a circuit breaker box.
Sur les figures 1 et 2, le combiné de mesure 10 est formé par l'association d'un capteur de courant 12 et d'un transformateur d'alimentation 14, agencée autour d'un orifice 13 susceptible d'être traversé par un conducteur primaire 15. Ce dernier est commun au capteur 12 et au transformateur 14, et est formé par un conducteur de phase d'un appareil électrique à déclencheur électronique (non représenté). Le capteur de courant 12 du combiné 10 comprend un tore amagnétique 16 fermé du type Rogowski, sur lequel est bobiné un premier enroulement secondaire 18 destiné à délivrer un signal de mesure à un circuit de traitement (non représenté) du déclencheur. Le signal de mesure de faible puissance est proportionnel à la dérivée du courant parcourant le conducteur primaire 15.In FIGS. 1 and 2, the
Le transformateur d'alimentation 14 adjacent comporte un circuit magnétique 20 en matériau ferromagnétique, et un deuxième enroulement secondaire 22 destiné à appliquer la tension d'alimentation au déclencheur électronique. Le circuit magnétique 20 est formé par un cadre fermé ayant à la base une branche rectiligne sur laquelle est bobiné le deuxième enroulement secondaire 22 s'étendant orthogonalement à l'orifice 13 circulaire. La cadre est constitué par deux empilements de tôles magnétiques assemblées symétriquement par rapport au plan médian de symétrie de trace xx'. La partie supérieure en voûte du cadre présente une forme semi-circulaire sensiblement centrée sur l'axe yy' de l'orifice 13. Le combiné 10 est protégé par l'assemblage de deux demi-coquilles 24,26 en matériau isolant moulé, destinées à assurer l'isolement par rapport au milieu environnant. Les demi-coquilles 24,26 viennent en aboutement dans le plan médian de symétrie.The
Le premier enroulement secondaire 18 du capteur 12 est formé par une succession de spires jointives réparties sur tout le pourtour du tore 16 amagnétique. Le tore 16 bobiné est placé à l'intérieur du circuit magnétique 20 du transformateur 14 avec une disposition coaxiale autour de l'orifice 13 de passage du conducteur primaire 15.The first
L'ensemble tore 16 et le premier enroulement secondaire 18 s'étend orthogonalement au deuxième enroulement secondaire 22 en épousant l'intérieur de la partie supérieure en voûte du circuit magnétique 20. La tore 16 amagnétique du capteur de courant 12 entoure directement le conducteur primaire 15 pour obtenir aux bornes du premier enroulement secondaire 18, un signal de mesure maximum en fonction d'un courant primaire prédéterminé. La largeur L du tore 16 de Rogowski mesurée le long de l'axe yy' correspond sensiblement à la dimension du deuxième enroulement secondaire 22 mesurée le long de cet axe YY'.The
Le deuxième enroulement secondaire 22 du transformateur d'alimentation 14 est plus éloigné du conducteur primaire 15 que le tore 16 et se trouve dans une zone de faible champ magnétique. Il en résulte une limitation de l'intensité fournie par l'enroulement 22 en cas d'apparition d'un courant de court-circuit dans le conducteur primaire 15.The second
Sur la figure 3, le conducteur primaire 15 est conformé selon une boucle 28, avec une disposition du deuxième enroulement secondaire 22 à l'extérieur de la boucle.In FIG. 3, the
En référénce à la figure 4, le combiné de mesure 10 est inséré dans un compartiment 30 de forme parallélépipédique d'un boîtier isolant de l'appareillage électrique. La partie supérieure en voûte du circuit magnétique 20 laisse subsister dans les coins du compartiment 30, deux volumes libres 32,34 autorisant le bobinage pour plusieurs passages du conducteur primaire 15 dans l'orifice 13. La section du conducteur primaire 15 correspond à des calibres inférieurs à 100 Ampères.With reference to FIG. 4, the
L'encombrement occupé par le combiné de mesure 10 dans un boîtier moulé d'appareillage, notamment d'un disjoncteur à déclencheur électronique à propre courant, est réduit au minimum.The space occupied by the
Claims (6)
caractérisé en ce que le capteur de courant (12) est disposé à l'intérieur du circuit magnétique (20) du transformateur d'alimentation (14) avec une disposition coaxiale autour de l'orifice (13), et que le premier enroulement secondaire (18) est situé plus près du conducteur primaire (15) que le deuxième enroulement secondaire (22), lequel est situé dans une zone à faible champ magnétique.Measuring device formed by the association of a non-magnetic core current sensor (12) having a first secondary winding (18) intended to deliver a measurement signal proportional to the derivative of the current flowing through a primary conductor (15 ) common through an orifice (13), and a supply transformer (14) comprising a magnetic circuit (20) of ferromagnetic material, which is crossed by said primary conductor (15), and carrying a second secondary winding (22 ) capable of supplying supply energy, in particular to an electronic trip device of an electric circuit breaker,
characterized in that the current sensor (12) is arranged inside the magnetic circuit (20) of the supply transformer (14) with a coaxial arrangement around the orifice (13), and that the first secondary winding (18) is located closer to the primary conductor (15) than the second secondary winding (22), which is located in an area with a weak magnetic field.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9203435A FR2688931B1 (en) | 1992-03-19 | 1992-03-19 | MEASURING HANDSET WITH CURRENT SENSOR AND POWER TRANSFORMER. |
FR9203435 | 1992-03-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0561717A1 true EP0561717A1 (en) | 1993-09-22 |
EP0561717B1 EP0561717B1 (en) | 1996-09-04 |
Family
ID=9427937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93420101A Expired - Lifetime EP0561717B1 (en) | 1992-03-19 | 1993-03-05 | Measuring combination with current sensor and power supply transformer |
Country Status (5)
Country | Link |
---|---|
US (1) | US5382896A (en) |
EP (1) | EP0561717B1 (en) |
JP (1) | JP3249228B2 (en) |
DE (1) | DE69304377T2 (en) |
FR (1) | FR2688931B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1467213A2 (en) * | 1996-10-23 | 2004-10-13 | General Electric Company | Self-powered axial current sensor |
WO2012094903A1 (en) * | 2011-01-13 | 2012-07-19 | 上海诺雅克电气有限公司 | Supply current transformer for electronic protection |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19706019A1 (en) * | 1997-02-07 | 1998-08-13 | Siemens Ag | Low-voltage circuit breakers with optionally installable measuring transducers |
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 (en) * | 2003-12-30 | 2005-06-30 | Abb Service Srl | POWER SUPPLY FOR AN ELECTRONIC PROTECTION DEVICE TO BE USED IN A LOW VOLTAGE SWITCH. |
FR2870350B1 (en) * | 2004-05-13 | 2006-07-14 | Schneider Electric Ind Sas | DEVICE FOR MEASURING AN ELECTRICAL CURRENT, CURRENT SENSOR, ELECTRICAL SENSOR AND CUTTING DEVICE COMPRISING SUCH A MEASURING DEVICE |
JP6492693B2 (en) * | 2015-01-27 | 2019-04-03 | 富士電機機器制御株式会社 | Current sensor unit |
DE102016123953A1 (en) * | 2016-12-09 | 2018-06-14 | Eaton Industries (Austria) Gmbh | switch cabinet |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR734768A (en) * | 1931-03-04 | 1932-10-28 | Delle Atel Const Electr | Improvements to air current transformers for high voltages |
GB427948A (en) * | 1933-11-02 | 1935-05-02 | British Thomson Houston Co Ltd | Improvements in and relating to electric transformers |
DE1638625A1 (en) * | 1967-12-15 | 1971-09-30 | Siemens Ag | Power converter |
FR2255603A1 (en) * | 1973-12-20 | 1975-07-18 | Siemens Ag | |
DE2711193A1 (en) * | 1977-03-15 | 1978-09-21 | Ritz Messwandler Kg | Current transformer system with inner core - has second core winding connected in parallel with winding of main core to reduce overcurrent factor |
US4262209A (en) * | 1979-02-26 | 1981-04-14 | Berner Charles A | Supplemental electrical power generating system |
FR2599195A1 (en) * | 1986-05-26 | 1987-11-27 | Merlin Gerin | Current sensor for a static trip |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4059798A (en) * | 1976-03-08 | 1977-11-22 | F. W. Bell, Inc. | Method and apparatus for measuring the current flowing in a workpiece |
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 |
US4540939A (en) * | 1982-04-16 | 1985-09-10 | Lucas Industries Public Limited Company | Apparatus for monitoring current levels in an a.c. transmission line |
-
1992
- 1992-03-19 FR FR9203435A patent/FR2688931B1/en not_active Expired - Fee Related
-
1993
- 1993-03-05 DE DE69304377T patent/DE69304377T2/en not_active Expired - Lifetime
- 1993-03-05 EP EP93420101A patent/EP0561717B1/en not_active Expired - Lifetime
- 1993-03-05 US US08/027,099 patent/US5382896A/en not_active Expired - Lifetime
- 1993-03-17 JP JP05729593A patent/JP3249228B2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR734768A (en) * | 1931-03-04 | 1932-10-28 | Delle Atel Const Electr | Improvements to air current transformers for high voltages |
GB427948A (en) * | 1933-11-02 | 1935-05-02 | British Thomson Houston Co Ltd | Improvements in and relating to electric transformers |
DE1638625A1 (en) * | 1967-12-15 | 1971-09-30 | Siemens Ag | Power converter |
FR2255603A1 (en) * | 1973-12-20 | 1975-07-18 | Siemens Ag | |
DE2711193A1 (en) * | 1977-03-15 | 1978-09-21 | Ritz Messwandler Kg | Current transformer system with inner core - has second core winding connected in parallel with winding of main core to reduce overcurrent factor |
US4262209A (en) * | 1979-02-26 | 1981-04-14 | Berner Charles A | Supplemental electrical power generating system |
FR2599195A1 (en) * | 1986-05-26 | 1987-11-27 | Merlin Gerin | Current sensor for a static trip |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1467213A2 (en) * | 1996-10-23 | 2004-10-13 | General Electric Company | Self-powered axial current sensor |
EP1467213A3 (en) * | 1996-10-23 | 2005-03-16 | General Electric Company | Self-powered axial current sensor |
WO2012094903A1 (en) * | 2011-01-13 | 2012-07-19 | 上海诺雅克电气有限公司 | Supply current transformer for electronic protection |
US8723630B2 (en) | 2011-01-13 | 2014-05-13 | Noark Electric (Shanghai) Co. Ltd. | Current transformer for supplying power to electronic controller |
EP2665071A4 (en) * | 2011-01-13 | 2017-10-18 | Noark Electrics (Shanghai) Co., Ltd. | Supply current transformer for electronic protection |
Also Published As
Publication number | Publication date |
---|---|
FR2688931B1 (en) | 1995-07-07 |
DE69304377D1 (en) | 1996-10-10 |
JPH0689823A (en) | 1994-03-29 |
DE69304377T2 (en) | 1997-02-20 |
EP0561717B1 (en) | 1996-09-04 |
US5382896A (en) | 1995-01-17 |
JP3249228B2 (en) | 2002-01-21 |
FR2688931A1 (en) | 1993-09-24 |
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