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EP0196992B2 - Transformateur de courant à noyau magnétique rectangulaire - Google Patents
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EP0196992B2 - Transformateur de courant à noyau magnétique rectangulaire - Google Patents

Transformateur de courant à noyau magnétique rectangulaire Download PDF

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Publication number
EP0196992B2
EP0196992B2 EP86730039A EP86730039A EP0196992B2 EP 0196992 B2 EP0196992 B2 EP 0196992B2 EP 86730039 A EP86730039 A EP 86730039A EP 86730039 A EP86730039 A EP 86730039A EP 0196992 B2 EP0196992 B2 EP 0196992B2
Authority
EP
European Patent Office
Prior art keywords
iron core
current transformer
insulating parts
coil forms
insulating
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
EP86730039A
Other languages
German (de)
English (en)
Other versions
EP0196992A1 (fr
EP0196992B1 (fr
Inventor
Peter Dipl.-Ing. Bradt
Günter Dipl.-Ing. Prietzel
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6264646&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0196992(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0196992A1 publication Critical patent/EP0196992A1/fr
Application granted granted Critical
Publication of EP0196992B1 publication Critical patent/EP0196992B1/fr
Publication of EP0196992B2 publication Critical patent/EP0196992B2/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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H01F27/325—Coil bobbins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49073—Electromagnet, transformer or inductor by assembling coil and core

Definitions

  • the invention relates to a current transformer with a rectangular iron core, in particular for low-voltage circuit breakers, with bobbins sitting on opposite legs of the iron core, and with connecting devices for windings and insulating parts located on the bobbins for isolating the iron core from a busbar to be enclosed by the iron core, wherein one of the insulating parts extends between both ends of the coil former and at least partially surrounds the exposed legs of the iron core in a U-shape.
  • a current transformer of this type is known from US-A-2 544 658.
  • the insulating parts extending between the coil formers are arranged so as to overlap with the coil formers in such a way that the required insulation distances between the primary conductor designed as a busbar and the iron core are ensured.
  • the busbar is designed so that it is angled several times so that the connection ends and both secondary coils are aligned with one another.
  • the primary conductor is therefore an integral part of the device.
  • a current transformer of this design is therefore more suitable for installation in a switchgear than for use in a low-voltage circuit breaker, for example in accordance with the Mitsubishi Electric 0482 / AE-S / G, or other similar circuit breakers.
  • the connecting rail belonging to the circuit breaker always serves as the primary conductor.
  • the secondary part of the transformer should be removable independently of this busbar.
  • circuit breakers In the case of circuit breakers, current transformers are used to obtain currents suitable for supplying electromechanical or electronic triggers from the currents flowing through the main current paths. Since a current transformer is usually required for each phase and low-voltage circuit breakers, plug-in units for motor controls and similar applications are manufactured in relatively large numbers, there is interest in a design of such current transformers that enables inexpensive production.
  • the invention is based on the object of creating a current transformer which can be pushed onto an existing power rail and which, with simple manufacture, ensures effective and permanent insulation between the primary part and the secondary part of the current transformer.
  • the form-fitting interaction of the coil formers and the insulating parts makes it possible, without the aid of tools, to first form a frame into which the L-shaped core sheets can then be inserted.
  • the iron core of the current transformer is therefore not prefabricated, but is created directly when the current transformer is assembled.
  • each insulating part encompassing the iron core in a U-shape engages at both ends in an overlapping manner in suitably shaped connecting regions of the coil former. This has an equally favorable effect on the mechanical stability of the aforementioned frame-like structure and on the increase in the creepage distances.
  • mutually associated depressions and elevations can be provided at the ends of the insulating parts and at the connection areas of the coil formers to form a positive-locking snap connection.
  • the coil formers and the insulating parts can thus only be joined together by a brief application of force to form a closed frame, without the need for tools or separate connecting elements.
  • connection chambers for the winding connections, these connection chambers forming contact surfaces for the region of each insulating part encompassing the busbar. This configuration facilitates the assembly of the coil former with the insulating parts.
  • connection chambers can only be open on one side; connection pieces enclosed by them can be arranged so as to protrude from the mouth of the connection chambers. This proves to be advantageous in connection with a method for producing a current transformer, as will be explained below.
  • the insulating bodies can have a web for forming a conduit.
  • connecting lines of the windings located on the coil form can be laid in a mechanically well protected manner, the creepage distances also being increased.
  • Another invention relates to a method for Production of a current transformer of the type described above, wherein after the windings have been applied to the coil formers, these are connected to form a frame by attaching the insulating parts and L-shaped sheets are inserted therein without overlap to form the iron core and are joined to the outer edges of the butt joints by a in particular arcing, welding seams are connected.
  • the welded seam although it can be carried out as a melt with a low penetration depth, firmly connects the laminated cores to one another.
  • the magnetic properties of the iron core are therefore retained regardless of later influences such as vibrations, temperature changes and the like.
  • the iron core now forms a clamp that holds the bobbins together.
  • Figure 1 shows a current transformer in a perspective view.
  • FIG. 2 two coil formers and insulating parts connecting them are also shown in perspective in an exploded and rotated view relative to FIG. 1.
  • FIG. 3 shows, as a detail of a coil former, a connection chamber in section with a connector inserted, the surface of an impregnation bath being indicated.
  • the current transformer 1 according to FIG. 1 has two identical bobbins 2 with windings 3 thereon.
  • Each of the bobbins 2 has winding flanges 4 and 5 in the usual way to limit the winding space, and also a rectangular hollow winding core 6 (see FIG. 2) for receiving one leg of a rectangular iron core 7.
  • the bobbins 2 are uniform bodies, which can preferably be produced from a suitable plastic by spraying.
  • Essential elements are molded onto the flanges 4 and 5 of the bobbin 2 for efficient manufacture of the current transformer 1.
  • each of the flanges 4 and 5 carries an approximately mushroom-shaped extension 8, which is used to put on a foot part 10, which is shown in FIG. 1 and whose use is still described.
  • the flanges 4 and 5 are provided with wall parts which extend in the extension of the winding core 6.
  • the iron core in this area is partially covered by the wall parts.
  • One wall part 11 is part of the extension 8 and has the height of the iron core 7, while the side wall parts 12 and 13 have a locally smaller height than the wall part 11 for a purpose to be explained.
  • Connection chambers 14 for receiving a contact pin, a screw terminal or the like are also integrally formed on the flanges 4 and 5. Between the connection chamber 14 and the wall part 13 there is a slot 15, which is provided for the protected laying of a winding wire or a line, as will be explained. Analogously, the same design is located on the opposite side in the area of the wall part 12, where a slot 17 is likewise formed by a lower wall part 16 arranged in parallel.
  • the flanges 4 and 5 are also provided with recesses 20 and 21 both in the area of the connection chamber 14 and the slot 17, which are used for the convenient insertion and removal of the winding wires from the winding space.
  • the distance 22 between the wall parts 12 and 13 on their side opposite the extension 8 is widened by a step to an enlarged distance 23.
  • the flanges 4 and 5 are designed in this area to create a recess with a reduced wall thickness.
  • a connection area 24 is created for the engagement of insulating parts 25, the aforementioned dimension expansion and the reduction in the wall thickness corresponding to a U-shaped area 26 provided for gripping around the exposed leg 45 of the iron core 7.
  • This is formed by side walls 27 with the height of the iron core 7 and a bottom part 28 with the width of the iron core 7. Near their ends, the side walls 27 and the bottom part 28 are provided on the outside with a groove 29 which interact with correspondingly shaped projections 30 of the wall parts 12 and 13 in the connection area 24 in a form-fitting manner according to a snap connection.
  • a further U-shaped region 31 with wall parts 32 and a bottom part 33 opens towards the opposite side.
  • the length of this region is corresponding to that
  • the total width of the current transformer 1 (FIG. 1) is dimensioned and accordingly extends over the width of the flanges 4 and 5.
  • the U-shaped region 31 serves to extend the creepage distance between a rectangular busbar 9 indicated in FIG. 1 and the windings 3 and the connection devices of the winding ends.
  • the ends of the U-shaped region 31 which protrude above the U-shaped region 26 of the insulating part 25 also act as abutments on the bobbins 2 when these bobbins are joined together with the insulating parts 25 14 and a projection 35 formed in the extension of each wall part 16.
  • webs 36 are provided which extend tion of the described line channels on the flanges 4 and 5 and serve to accommodate the coil wires or connecting lines.
  • the insulating parts 25 can also be designed as plastic injection molded parts. Their wall thickness can be chosen to be less than the wall thickness of the coil former 2, since it is essentially a question of maintaining electrical creepage distances and there is no significant mechanical stress.
  • windings are first applied to the bobbins 2 in a known manner.
  • the winding ends are only mechanically fixed to pins 37 of the flanges 4 and 5 or are soldered to connecting pieces 40 projecting into the connecting chambers 14.
  • both bobbins are connected to the windings located thereon with the aid of the insulating pieces 25, which can be achieved in a simple manner by a brief effort in the direction of the arrows 41 in FIG. 2 due to the snap connection provided.
  • the iron core 7 is now installed in the frame formed in this way by inserting L-shaped iron sheets 42 from opposite sides without overlap, as is indicated in FIG. 2.
  • the closed magnetic circuit is produced in that the two L-shaped laminated cores are connected at their butt joints by an arc weld 43.
  • the wall parts 12 and 13 on the outer sides of the flanges 4 and 5 are designed locally with a height that is lower than the height of the iron core 7 in order to be able to carry out the welding process without damaging the plastic parts.
  • the laminated cores are expediently pressurized in the direction of the arrows 46 (FIG. 2), the forces being able to be introduced via the lugs 8. There is practically no air gap at the butt joints of the sheets 42. Since no cross holes for clamping bolts, outer clamps or rivets are required, the iron core 7 has consistently good magnetic properties with a comparatively small cross-section.
  • the desired type of coil switching can be carried out before or after installation of the iron core, in which, for example, the winding ends of one winding are guided through the mentioned conduit channels and soldered to the connecting pieces 40 located on the other coil former.
  • the mechanically and electrically finished current transformer 1 can also be subjected to a paint treatment in order to improve the insulating capacity and to protect the iron core 7 against corrosion.
  • the manufacture of the current transformer 1 is made considerably easier in that the coil formers can be assembled into a stable and dimensionally accurate frame by means of the insulating parts 25 before the iron core is installed.
  • the insulating parts 25 ensure permanent insulation of the iron core 7 with respect to the busbar 9 and the connection devices of the winding ends.
  • the bobbins 2 are identical, there is extensive freedom of movement with regard to the position of the connection points, since a total of four connection chambers 14 are available, which are distributed over both sides of the current transformer 1.
  • the current transformer can be due to the presence of four lugs 8 optionally in one or a 0 to 180 rotated position fix.
  • the foot parts 10 can be pushed onto the corresponding lugs 8.
  • FIG. 3 shows, using the example of one of the connection chambers 14, that the associated connection piece 40 is arranged so as to protrude from the mouth 50. If the completed current transformer 1 (FIG. 1) is now introduced into the impregnation bath in the direction of arrow 52, the mouth 50 of the connection chambers 14 equipped with connecting pieces 40 faces the surface 51 of the impregnation bath.
  • the connection chambers act as diving bells, since they are only open on one side. This prevents wetting of the connectors with the soaking agent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Insulating Of Coils (AREA)

Claims (8)

1. Transformateur d'intensité comportant un noyau de fer rectangulaire (7), notamment pour des disjoncteurs à basse tension, des corps de bobine (2) prenant appui sur des branches opposées du noyau de fer (7), ainsi que des dispositifs de raccordement (14,40) pour des enroulements (3) situés sur les corps de bobine (2), et des éléments isolants (25) servant à isoler le noyau de fer (7) par rapport à une barre conductrice (9) devant être entourée par le noyau de fer (7), et dans lequel respectivement l'un des éléments isolants (25) s'étend entre les deux extrémités des corps de bobine (2) et entoure au moins partiellement, avec une forme en U, la branche libre (45) du noyau de fer (7), caractérisé par les caractéristiques suivantes :
les corps de bobine (2) sont raccordés, aux deux extrémités, par des éléments isolants respectifs (25),
les corps de bobine (2) et les éléments isolants (25) sont réalisés de manière à coopérer selon une liaison par formes complémentaires, les éléments isolants (25) entourent la barre conductrice (9) au moins partiellement avec une forme en U sur la largeur du transformateur d'intensité (1) (zone 31),
le noyau de fer (7) est formé par la réunion de tôles (42) en forme de L, qui ne se chevauchent pas.
2. Transformateur d'intensité suivant la revendication 1, caractérisé par le fait que la zone (26), qui entoure en forme de U le noyau de fer (7), de chaque corps isolant (25) s'engage à ses deux extrémités, dans des zones de raccordement de forme adaptée des corps de bobine (2).
3. Transformateur d'intensité suivant la revendication 2, caractérisé par le fait qu'une liaison à encliquetage brusque agissant à la manière d'une liaison par formes complémentaires est formée par des renfoncements (30) et des élévations (31), réciproquement associés et ménagés sur les extrémités du corps isolant (25) et sur les zones de raccordement (24) des corps de bobine.
4. Transformateur d'intensité suivant la revendication 1, caractérisé par le fait que les corps de bobine (2) sont équipés de chambres de raccordement (14) pour les bornes des enroulements et que ces chambres de raccordement forment des surfaces d'appui pour la zone (31 qui entoure la barre conductrice (9), de chaque partie isolante (25)
5. Transformateur d'intensité suivant la revendication 4, caractérisé par le fait que les chambres de raccordement (14) sont réalisées de manière à être ouvertes uniquement d'un seul côté et sont disposées de telle sorte que les organes de raccordement (40), qu'elles entourent, sont disposés en retrait par rapport à l'ouverture (50) des chambres de raccordement (14).
6. Transformateur d'intensité suivant la revendication 1, caractérisé par le fait que les éléments isolants (25) comportent une barrette (36) disposée parallèlement à un élément de paroi latéral (27), recouvrant latéralement le noyau de fer (7) et servant à former un conduit pour câbles.
7. Procédé pour fabriquer un transformateur d'intensité suivant l'une des revendications précédentes, caractérisé par le fait qu'après le dépôt des enroulements (3) sur les corps de bobine (2), on réunit ces derniers moyennant la mise en place des éléments isolants (25) pour former un cadre, on insère dans ce dernier, sans chevauchement, des tôles en forme de L (42) de manière à former le noyau de fer (7) et on les réunit par un cordon de soudure (43) aux bords extérieurs des joint d'aboutement.
8. Procédé suivant la revendication 7, caractérisé par le fait que pour le traitement du transformateur d'intensité (1) terminé du point de vue mécanique, dans un bain d'imprégnation, on immerge le transformateur dans ce bain de manière que l'ouverture (50) des chambres de raccordement (14) munies des organes de raccordement (40) soit tournée vers la surface (51) du bain.
EP86730039A 1985-03-06 1986-03-04 Transformateur de courant à noyau magnétique rectangulaire Expired - Lifetime EP0196992B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853508327 DE3508327A1 (de) 1985-03-06 1985-03-06 Stromwandler mit einem rechteckigen eisenkern
DE3508327 1985-03-06

Publications (3)

Publication Number Publication Date
EP0196992A1 EP0196992A1 (fr) 1986-10-08
EP0196992B1 EP0196992B1 (fr) 1988-09-28
EP0196992B2 true EP0196992B2 (fr) 1993-01-20

Family

ID=6264646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86730039A Expired - Lifetime EP0196992B2 (fr) 1985-03-06 1986-03-04 Transformateur de courant à noyau magnétique rectangulaire

Country Status (5)

Country Link
US (1) US4700166A (fr)
EP (1) EP0196992B2 (fr)
JP (1) JPH0630307B2 (fr)
DE (2) DE3508327A1 (fr)
IN (1) IN165981B (fr)

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JPS63142622A (ja) * 1986-12-04 1988-06-15 Nippon Denso Co Ltd 内燃機関の点火コイル
DE4325056C1 (de) * 1993-07-26 1995-01-12 Siemens Nixdorf Inf Syst Planar-Transduktor
WO1995024050A2 (fr) * 1994-03-02 1995-09-08 Siemens Aktiengesellschaft Transformateur de courant pour conducteur se presentant sous forme de rail
US6118362A (en) * 1997-01-24 2000-09-12 Sundstrand Corporation Integrated inductive assembly
DE19815153C1 (de) * 1998-03-27 1999-07-15 Siemens Ag Stromwandler zur Versorgung eines elektronischen Überstromauslösers mit Hilfsenergie
CA2233802C (fr) * 1998-03-31 2004-09-14 Trans-Coil, Inc. Bobinette avec plaquettes de soutien integral
JP5285357B2 (ja) * 2008-08-29 2013-09-11 ミドリ安全株式会社 変流器
US9607750B2 (en) * 2012-12-21 2017-03-28 Eaton Corporation Inductor systems using flux concentrator structures
DE102016118149B4 (de) 2016-09-26 2025-12-04 Hitachi Energy Ltd Transformator
EP4022657A1 (fr) * 2020-01-15 2022-07-06 Hitachi Energy Switzerland AG Procédé de fabrication d'un transformateur de type sec, transformateur de type sec obtenu à partir dudit procédé, et agencement de barrière diélectrique pour isoler électriquement une bobine d'un ensemble transformateur
JP7854162B2 (ja) * 2022-09-10 2026-05-01 株式会社力電 超広域対応の電流センサ計測機、盤、及び、電力プラント
CN118762899B (zh) * 2024-09-05 2025-01-21 华电新乡发电有限公司 一种用于电机电流采集的电流互感器及数据监测处理方法

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US2544658A (en) * 1946-04-27 1951-03-13 Gen Electric Electric induction apparatus
GB804827A (en) * 1956-03-12 1958-11-26 Siemens Ag Improvements in or relating to coil carriers intended for use in magnetic amplifiers
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JPS6020128U (ja) * 1983-07-19 1985-02-12 株式会社トーキン 変流器

Also Published As

Publication number Publication date
DE3660846D1 (en) 1988-11-03
DE3508327A1 (de) 1986-09-11
EP0196992A1 (fr) 1986-10-08
JPS6249611A (ja) 1987-03-04
EP0196992B1 (fr) 1988-09-28
JPH0630307B2 (ja) 1994-04-20
IN165981B (fr) 1990-02-17
US4700166A (en) 1987-10-13

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