EP2015320B1 - Transformateur de courant pour alimentation électrique et son procédé de fabrication - Google Patents

Transformateur de courant pour alimentation électrique et son procédé de fabrication Download PDF

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Publication number
EP2015320B1
EP2015320B1 EP08011709.6A EP08011709A EP2015320B1 EP 2015320 B1 EP2015320 B1 EP 2015320B1 EP 08011709 A EP08011709 A EP 08011709A EP 2015320 B1 EP2015320 B1 EP 2015320B1
Authority
EP
European Patent Office
Prior art keywords
core
power supply
gap
current
current transformer
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.)
Active
Application number
EP08011709.6A
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German (de)
English (en)
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EP2015320A1 (fr
Inventor
Jong Mahn Sohn
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.)
LS Electric Co Ltd
Original Assignee
LS Industrial Systems Co Ltd
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Filing date
Publication date
Application filed by LS Industrial Systems Co Ltd filed Critical LS Industrial Systems Co Ltd
Publication of EP2015320A1 publication Critical patent/EP2015320A1/fr
Application granted granted Critical
Publication of EP2015320B1 publication Critical patent/EP2015320B1/fr
Active 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/12—Magnetic shunt paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • 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

Definitions

  • the present invention relates to a current transformer for power supply and a method for manufacturing the same, and more particularly, to a current transformer for power supply capable of smoothly performing power supply and preventing damage of a subject to be supplied with power, and a method for manufacturing the same.
  • a current transformer for power supply is referred to as a current transformer (CT) or a relaying current transformer.
  • CT current transformer
  • the current transformer is mainly used as a power source of a current system or a power system in electric power distributing equipment, or a power source of a trip coil or an over current relay (OCR) in an air circuit breaker (ACB).
  • OCR over current relay
  • a current transformer for power supply comprises a core 20 having a loop shape, bobbins 30 coupled to each other so that the core 20 can be received therein, and coils 40 wound on the bobbins 30.
  • a primary conductor 10 passes through inside of the coil 20, and the core 20 is formed by insulation-laminating square-ring shaped plates.
  • the bobbins 30 are coupled to each other in a facing manner so that the primary conductor 10 can be disposed therebetween inside the core 20.
  • the coil 40 is wound on each of the bobbins 30.
  • the conventional current transformer for power supply has the following problems.
  • a saturation phenomenon occurs at a large current region, thus to induce a high voltage to both ends of the coil 40 and to flow a large current. Accordingly, a power supply subject, such as an over current relay, may be damaged.
  • a protecting device In order to prevent the power supply subject from being damaged due to flow of a large current, a protecting device (or a protecting circuit) has to be additionally provided at the power supply subject.
  • EP 1 394 823 A (SIEMENS AG [DE]) 3 March 2004 (2004-03-03) discloses a transformer to acquire the current flowing in a primary conductor.
  • the transformer has a core 3 with an air-gap 4.
  • the section with the air-gap is surrounded by a secondary coil 5.
  • a further magnetic branch 6 forms a magnetic bypass for the section of the core 3, surrounded by secondary coil 5.
  • a current transformer for power supply comprising: a first core formed of a magnetic substance, and having a loop shape with a gap at one side thereof; and at least one supporting core formed of a magnetic substance, and disposed at one or more sides of the first core so as to block the gap.
  • the first core includes a straight portion, and the gap is formed at the straight portion.
  • the first core includes segment cores each having the straight portion and a curved portion extending from one end of the straight portion.
  • Each supporting core includes a straight portion corresponding to the straight portion of the first core, and a curved portion having a length longer than one of the curved portions of the segment cores.
  • a supporting core is disposed at each of both sides of the first core in a thickness direction. Each supporting core is disposed so that the one curved portion thereof can come in contact with two curved portions of the segment cores.
  • the current transformer for power supply further comprises a coil disposed around the gap.
  • the current transformer for power supply may further comprise a second core formed of a magnetic substance, having a shape corresponding to the first core, and disposed at one or more sides of the first core.
  • the second core may include a straight portion and a curved portion corresponding to the straight portion and the curved portion of the first core.
  • the current transformer for power supply may further comprise a supporting core having a shape corresponding to the first core or the second core, and disposed at one or more sides of the first core or the second core.
  • the supporting core may be disposed at both outer sides of the first core and the second core in a thickness direction.
  • a method for manufacturing a current transformer for power supply comprising: forming a core having a loop shape with a gap at one region thereof; and winding a coil around the gap.
  • the step of forming a core comprises forming segment cores facing each other to form a gap therebetween.
  • the step of forming a core further comprises disposing a supporting core formed of a magnetic substance at one or more sides of the segment cores so as to block the gap.
  • the step of forming a core may further comprise disposing a second core formed of a magnetic substance and having a loop shape at one or more sides of the segment cores so as to block the gap.
  • the step of forming a core may further comprise forming a second core by forming segment cores facing each other and having a close loop.
  • the method may further comprise disposing a supporting core outside the second core.
  • the method may further comprise providing a bobbin.
  • the segment cores may be inserted into the bobbin so as to form the gap.
  • the method may further comprise disposing a bobbin around the gap.
  • a current transformer for power supply comprises a case 120 having a receiving space therein, a power supply unit 140 for supplying a current induced by a primary conductor 110 to a power supply subject such as an over current relay (OCR), a current measuring unit 181 for measuring a current flowing on the primary conductor 110, and a PCB 191 connected to the power supply unit 140 and the current measuring unit 181, respectively.
  • OCR over current relay
  • a primary conductor coupling portion 122 for coupling the primary conductor 110 is formed at the case 120.
  • the current measuring unit 181 implemented as a circular Rogowski coil is disposed around the primary conductor coupling portion 122.
  • An insulating member 185 is disposed at one side (an upper side in FIG. 3 ) of the current measuring unit 181.
  • the PCB 191 is fixedly-coupled by a screw 193 between the current measuring unit 181 and the power supply unit 140.
  • a connector 135 is formed at one region of the case 120 so as to be electrically connected to the PCB 191 and a power supply subject.
  • the power supply unit 140 includes a core 141 disposed around the primary conductor 110, a bobbin 171 coupled to the core 141, and a coil 175 wound on the bobbin 171.
  • the coil 175 is received in the case 120 having one opened side.
  • a cover 130 is coupled to the case 120 by a screw 133 thus to cover the coil 175.
  • the core 141 includes a first core 151 formed of a magnetic substance, and having a loop shape with a gap (G) at one side thereof; and supporting cores 161 formed of a thin plate type magnetic substance, and disposed at one or more sides of the first core 151 so as to block the gap (G).
  • the number of plates of the first core 151, and each thickness of the supporting cores 161 are controlled according to a capacity of a rated current.
  • the first core 151 is formed as one pair of segment cores 155 face each other so as to form a gap (G) therebetween.
  • the segment cores 155 of the first core 151 are formed by insulation-laminating plates, each plate having a straight portion 156 and a curved portion 157 curved from one end of the straight portion 156.
  • the straight portion 156 of the segment core 155 is formed to be separated from a center line (C L ) of the first core 151 by a certain distance (G/2).
  • the supporting cores 161 have a shape corresponding to the first core 151, and include straight portions 163 and curved portions 165 curved from each one end of the straight portions 163. As shown in FIG. 7 , the straight portions 163 of the supporting cores 161 are formed to cover the entire length of the straight portions 156 of the first core 151 including the gap (G). As shown in FIG. 9 , the curved portions 165 of the supporting cores 161 are formed to have a length longer than the curved portions 157 of the segment cores 155 of the first core 151 by being extended from the center line (C L ).
  • the curved portions 165 of the supporting cores 161 are formed to have a length extending enough to block an interface region between two ends of the two curved portions 157 of the two segment cores 155 of the first core 151.
  • the supporting cores 161 are disposed so that the two curved portions 165 thereof can come in contact with the two curved portions 157 of the two segment cores 155 of the first core 151.
  • the straight portion 156 of the first core 151 is inserted into the bobbin 171, and the supporting cores 161 are disposed at both sides of the first core 151. Then, contact regions between two ends of the straight portions 156 of the first core 151 and the two curved portions 157 are coupled to each other by an argon welding, etc.
  • a current flows to the primary conductor 110, a magnetic flux is induced to the core 141, and a secondary current is generated at the coil 175.
  • the secondary current is supplied to a power supply subject such as an over current relay (OCR) connected to the connector 135 via the PCB 191.
  • OCR over current relay
  • a core 211 includes a first core 151 formed of a magnetic substance, and having a loop shape with a gap (G) at one side thereof; and a second core 221 formed of a magnetic substance, having a shape corresponding to the first core 151, and disposed at one or more sides of the first core 151.
  • the first core 151 has two segment cores 155.
  • the first core 151 and the second core 221 are respectively formed by insulation-laminating thin magnetic plates, and the number of plates can be controlled according to a capacity of a rated current.
  • the second core 221 is composed of one pair of segment cores 225 symmetrical to each other.
  • the segment cores 225 of the second core 221 are formed by insulation-laminating magnetic plates, each magnetic plate having a straight portion 226 and a curved portion 227 curved from one end of the straight portion 226.
  • One pair of supporting cores 161 are coupled onto each outer circumference of the first core 151 and the second core 221 in a thickness direction.
  • Each of the supporting cores 161 is formed of a magnetic substance, and includes a straight portion 163 and a curved portion 165.
  • the two curved portions 165 of the supporting cores 161 are contact-coupled to the curved portions 157, 227 of the first and second cores 151,221.
  • the supporting cores 161 may be formed of a non-magnetic substance.
  • the straight portions 156, 226, 163 of the first core 151, the second core 221, and the supporting cores 161 are inserted into the bobbin 171. Then, contact regions of the supporting cores 161 with two ends of the straight portions 156 of the first core 151 and the two curved portions 157 are welded one another, thereby integrally coupling the first core 151, the second core 221, and the supporting cores 161 one another.
  • a current transformer for power supply comprises a first core 255 formed of a magnetic substance, and having a loop shape with a gap at one side thereof; and a supporting core 261 formed of a magnetic substance, and coupled to the first core 255 so as to block one or more sides of the gap (G) of the first core 255.
  • the first core 255 includes one 'U'-shaped curved portion 257; and two straight portions 256 linearly curved from both ends of the curved portion 257, and having a predetermined gap (G) therebetween.
  • the first core 255 is formed by insulation-laminating thin plates.
  • the supporting core 261 is linearly formed to have a length corresponding to the two straight portions 256 of the first core 255.
  • the length of the supporting core 261 can be controlled.
  • a bobbin 271 is coupled to the straight portions 256 of the first core 255 so as to wind a coil thereon.
  • the bobbin 271 is composed of a first member 273 and a second member 275 coupled to each other in a facing manner in a thickness direction.
  • Guide portions 274, 276 are respectively formed at both ends of the first and second members 273, 275 so as to be protruding in a width direction and extending in a circumference direction.
  • first and second members 273, 275 are coupled to each other so that the straight portions 256 of the first core 255 can be received therein. Then, a coil is wound on the first and second members 273, 275 coupled to each other.
  • a current transformer for power supply comprises a first core 255 formed of a magnetic substance, and having a loop shape with a gap at one side thereof; and a second core 281 formed of a magnetic substance, having a shape corresponding to the first core 255, and disposed at one or more sides of the first core 255.
  • the first core 255 includes a 'U'-shaped curved portion 257; and straight portions 256 linearly curved from both ends of the curved portion 257, and having a predetermined gap (G) therebetween.
  • the second core 281 is formed to have a closed loop shape, which includes straight portions 283 corresponding to the straight portions 256 of the first core 255, and curved portions 285 formed to connect two ends of the straight portions 283.
  • the second core 281 is disposed at both sides of the first core 255 in a thickness direction.
  • the second core 281 may be disposed at one side of the first core 255.
  • a bobbin 271 is coupled to the straight portions 256, 283 of the first and second cores 255, 281 so as to wind a coil thereon.
  • the bobbin 271 is composed of a first member 273 and a second member 275 coupled to each other in a facing manner under a state that the straight portions 256, 283 are interposed therebetween.
  • the first and second cores 255, 281 are coupled to each other by a welding, etc., and the first and second members 273, 275 are coupled to each other in a facing manner so that the straight portions 256, 283 of the first and second cores 255, 281 can be received therein. Then, a coil is wound on the first and second members 273, 275 coupled to each other.
  • a secondary current linearly-increases in proportional to a primary current at a small current region.
  • a saturation phenomenon easily occurs.
  • a RMS (root mean square) value does not increase but a current peak value increases.
  • a power supply subject such as an OCR (over current relay) may be damaged.
  • a secondary current non-linearly increases in proportional to a primary current.
  • a small current flows to the primary conductor 110
  • a small secondary current can be stably supplied to a power supply subject.
  • a primary current increases
  • a secondary current non-linearly increases.
  • a large current such as an abnormal current flows to the primary conductor 110
  • a magnetic flux is limited due to the gap (G) of the core thus to limit the size of the secondary current. Accordingly, damage of a power supply unit such as OCR due to a large current can be prevented.
  • a secondary current increases in proportional to a primary current.
  • the secondary current of the second embodiment is smaller than the conventional one, but is larger than that of the first embodiment due to a gap (G) smaller than the gap (G) of the first embodiment.
  • the secondary current can be made to be small and a saturating time can be prolonged.
  • a gap is formed at the core to limit a magnetic flux thus to reduce the secondary current, thereby preventing damage of a power supply unit such as OCR due to a large current.
  • the amount of a coil can be reduced by limiting a magnetic flux induced to the core, the manufacturing cost can be reduced by reducing the number of bobbins, and the entire size of the current transformer can be decreased.
  • the current transformer for power supply power is stably supplied to a power supply subject at a small current region, and a magnetic flux induced to the core is properly controlled at a large current region. Accordingly, damage of the power supply unit due to a large current can be prevented.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Transformers For Measuring Instruments (AREA)

Claims (7)

  1. Un transformateur de courant pour une alimentation de puissance, comprenant :
    un premier noyau (151) formé d'une substance magnétique et présentant une forme en boucle avec un interstice (G) sur un de ses côtés ; et
    au moins un noyau support (161) formé d'une substance magnétique et disposé sur au moins un côté du premier noyau de manière à bloquer l'interstice (G), et un enroulement (175) disposé autour de l'interstice (G), dans lequel le premier noyau (151) comprend une partie rectiligne (156) et l'interstice (G) est formé au niveau de la partie rectiligne (156), dans lequel
    le premier noyau (151) comprend des segments de noyau (155) dont chacun possède la partie rectiligne (156) et une partie courbée (157) s'étendant à partir d'une extrémité de la partie rectiligne (156),
    caractérisé en ce que chaque noyau support comprend :
    une partie rectiligne (163) correspondant à la partie rectiligne (156) du premier noyau (151) ; et
    une partie courbe (165) ayant une longueur supérieure à l'une des parties courbes (157) des segments de noyau (155),
    et un noyau support (161) est disposé à chacune des deux extrémités du premier noyau (151) dans une direction de l'épaisseur de sorte que sa partie courbe (165) puisse venir en contact avec deux parties courbes (157) des segments de noyau (155).
  2. Le transformateur de courant pour alimentation de puissance de la revendication 1, comprenant en outre un second noyau (221) formé d'une substance magnétique, présentant une forme correspondant au premier noyau (151) et disposé sur un ou plusieurs côtés du premier noyau (151).
  3. Un procédé de fabrication du transformateur de courant pour alimentation de puissance selon la revendication 1, comprenant :
    la formation d'un noyau (141 ; 211) possédant le premier noyau (151) et le au moins un noyau support (161) ; et
    le bobinage d'un enroulement (175) autour de l'interstice (G), dans lequel l'étape de formation du noyau (141 ; 211) comprend la formation de segments de noyau (155) se faisant face l'un à l'autre pour former entre eux l'interstice (G),
    caractérisé en ce que
    l'étape de formation du noyau (141 ; 211) comprend en outre le placement du au moins un noyau support (161) formé de la substance magnétique sur au moins un côté des segments de noyau (155) de manière à bloquer l'interstice (G) et mettre en contact une partie courbe (165) de chaque noyau support (161) avec deux parties courbes (157) des segments de noyau (155).
  4. Le procédé de la revendication 3, dans lequel l'étape de formation du noyau (211) comprend en outre le placement d'un second noyau (221) formé d'une substance magnétique et présentant une forme en boucle sur au moins un côté des segments de noyau (155) de manière à bloquer l'interstice (G).
  5. Le procédé de la revendication 4, comprenant en outre, avant le placement du second noyau (221), la formation du second noyau (221) par formation de segments de noyau (225) faisant face l'un à l'autre avec une boucle fermée.
  6. Le procédé de la revendication 4, comprenant en outre l'obtention d'une bobine (171) avant la formation du noyau (141 ; 211), dans lequel à l'étape de formation du noyau (141 ; 211), les segments de noyau (155) sont insérés dans la bobine (171) de manière à former l'interstice (G) dans la bobine (171).
  7. Le procédé de l'une des revendications 3 à 6, comprenant en outre le placement de la bobine (171) autour de l'interstice (G) avant le bobinage de l'enroulement (175).
EP08011709.6A 2007-07-12 2008-06-27 Transformateur de courant pour alimentation électrique et son procédé de fabrication Active EP2015320B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070070281A KR100881364B1 (ko) 2007-07-12 2007-07-12 전원용 전류 변성기 및 그의 제조방법

Publications (2)

Publication Number Publication Date
EP2015320A1 EP2015320A1 (fr) 2009-01-14
EP2015320B1 true EP2015320B1 (fr) 2017-10-11

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ID=39838931

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Application Number Title Priority Date Filing Date
EP08011709.6A Active EP2015320B1 (fr) 2007-07-12 2008-06-27 Transformateur de courant pour alimentation électrique et son procédé de fabrication

Country Status (6)

Country Link
EP (1) EP2015320B1 (fr)
KR (1) KR100881364B1 (fr)
CN (1) CN101345126B (fr)
ES (1) ES2655865T3 (fr)
MY (1) MY180448A (fr)
RU (1) RU2390865C2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8410890B2 (en) * 2009-11-25 2013-04-02 Schneider Electric USA, Inc. Combination wire connector and current transformer
DE102012201992A1 (de) 2012-02-10 2013-08-14 Siemens Aktiengesellschaft Kombinationswandleranordnung und Schaltgerät
US8870608B2 (en) 2012-09-14 2014-10-28 Schneider Electric USA, Inc. Open spring mechanical clamping lug
DE102017005529B4 (de) * 2017-06-10 2023-11-02 Kostal Automobil Elektrik Gmbh & Co. Kg Induktives Bauteil
KR102003943B1 (ko) * 2018-01-25 2019-07-31 엘에스산전 주식회사 회로차단기의 파워 변류기 어셈블리

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Publication number Priority date Publication date Assignee Title
DE1766446C3 (de) * 1968-05-24 1973-11-08 Messwandler-Bau Gmbh, 8600 Bamberg Eisenkernsystem fur einen hneari sierten Stromwandler
CH674089A5 (fr) * 1987-10-16 1990-04-30 Lem Liaisons Electron Mec
SE0000410D0 (sv) * 2000-02-06 2000-02-06 Lennart Hoeglund Trefas transformatorkärna
US6762666B2 (en) * 2002-05-07 2004-07-13 Defond Manufacturing Limited Toroidal core for a toroid
JP2004022847A (ja) 2002-06-18 2004-01-22 Hitachi Ltd 変流器，電源装置及びセンサシステム
DE10240351A1 (de) * 2002-08-28 2004-03-11 Siemens Ag Wandleranordnung zur Speisung eines Auslösemagneten
CN2580575Y (zh) * 2002-10-15 2003-10-15 禾益电子企业股份有限公司 环形电感的环形铁芯
US6873239B2 (en) * 2002-11-01 2005-03-29 Metglas Inc. Bulk laminated amorphous metal inductive device

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
KR100881364B1 (ko) 2009-02-02
EP2015320A1 (fr) 2009-01-14
CN101345126A (zh) 2009-01-14
MY180448A (en) 2020-11-28
KR20090006685A (ko) 2009-01-15
RU2008128354A (ru) 2010-01-20
RU2390865C2 (ru) 2010-05-27
CN101345126B (zh) 2011-03-30
ES2655865T3 (es) 2018-02-22

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