EP0061521B1 - Corps d'écran pour culasses de noyaux de fer dans des transformateurs et dans des bobines de réactance - Google Patents

Corps d'écran pour culasses de noyaux de fer dans des transformateurs et dans des bobines de réactance Download PDF

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Publication number
EP0061521B1
EP0061521B1 EP81108636A EP81108636A EP0061521B1 EP 0061521 B1 EP0061521 B1 EP 0061521B1 EP 81108636 A EP81108636 A EP 81108636A EP 81108636 A EP81108636 A EP 81108636A EP 0061521 B1 EP0061521 B1 EP 0061521B1
Authority
EP
European Patent Office
Prior art keywords
conductive
paper insert
yoke
conductive paper
screening
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
Application number
EP81108636A
Other languages
German (de)
English (en)
Other versions
EP0061521A1 (fr
Inventor
Walter Lutz
Herbert Mössinger
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.)
Transformatoren Union AG
Original Assignee
Transformatoren Union 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 Transformatoren Union AG filed Critical Transformatoren Union AG
Priority to AT81108636T priority Critical patent/ATE9628T1/de
Publication of EP0061521A1 publication Critical patent/EP0061521A1/fr
Application granted granted Critical
Publication of EP0061521B1 publication Critical patent/EP0061521B1/fr
Expired 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material

Definitions

  • the invention relates to shield bodies made of several layers of insulating material with a conductive paper insert for yokes of stepped laminated iron cores of transformers and choke coils for shielding the yoke step edges against end faces or end shield rings of windings.
  • Such shield bodies are usually made up of several layers of insulating material, between which at least one layer of electrically conductive material is provided.
  • these electrically conductive layers are connected to a low-resistance grid which also covers them and is likewise made of electrically conductive material, in order thereby to prevent the occurrence of voltage differences within the layer of electrically conductive material provided for shielding.
  • These grids are usually made of copper braid or copper fabric tape and led out of the actual shielding body with a connecting conductor, and galvanically connected to the component to be shielded.
  • Such a shield is z. B. from DE-A-1 563 219 known.
  • the invention is therefore based on the object of creating a shield body for transformers and choke coils for their yoke parts facing the windings, which is both simple to manufacture and can be installed without complications and at the same time satisfies the physical requirements imposed on it.
  • this object is achieved in a shield body of the type mentioned at the outset in that the conductive paper insert is completely galvanically separated from all adjacent and mutually live parts, that the conductive layer in the conductive insert is high-impedance and free of voltage compensation conductors, that the electrical guided by the conductive insert Potential is set purely capacitively by the ratio of the distance between the yoke iron and the guide paper insert to the distance between the guide paper insert and the end face or end shield ring of the windings and that the edges of the guide paper insert on all sides are offset from the edges of the other layers of insulating material.
  • the insulating layer between the yoke iron and the conductive paper insert is single-layered and that the conductive paper insert is coated on the side facing away from the yoke iron with electrically conductive material and is covered on this side by an uncoated paper layer.
  • the conductive paper insert advantageously covers at least three steps in the circumferential direction of the yoke and is adapted in the longitudinal direction of the yoke to the penetration line of the yoke with a core leg.
  • the conductive paper insert To securely fix the conductive paper insert in place, it is glued to at least one of its neighboring insulating layers and the step-parallel edges of the shield body are bent in the direction of the yoke.
  • the step-parallel edges of the insulating layers are held together by caps which are arranged at a distance from one another and comprise the edges.
  • the shield body designed according to the invention is very advantageous because, due to its simple construction, it is also easy to manufacture and, as a result of connection leads which are not required, ensures extremely high operational reliability.
  • a core leg 1 carries windings 2 with an end insulation 3.
  • the core leg 1 is in a manner not shown with a lower yoke 4 interlocked so that the lower yoke 4 and the core leg 1 mechanically hold and support each other.
  • the pressing forces required for this are applied in the usual way by bandages and / or pressing iron and / or pressing bolts.
  • plates 5 made of insulating material are provided, the surfaces of which face the windings 2, together with the surface of the lower yoke 4 on the winding side, form the winding table on which the windings 2 are supported downward in a manner not shown are.
  • These plates 5 cover the plate packs lying further outwards of the laminated lower yoke 4, which is cross-sectionally adapted to a predetermined curve shape.
  • both the windings 2 and the stepped lower yoke 4 are provided with large-area shields.
  • the winding-side shielding is installed in the end-side insulation 3 of the windings in a manner which is not illustrated in any more detail.
  • Filling bodies 7 and 8 serve to mechanically support the thin-walled shield body 6, which fill the step spaces enclosed by the steps of the lower yoke 4 and the shield body 6.
  • the fillers 7 and 8 are made, for example, of wood, pressboard or pressed wood.
  • Fig. 2 shows on a greatly enlarged scale the layered structure of the shield body 6 from insulating layers.
  • These layers of insulating material consist, beginning on the side of the shield body 6 facing the lower yoke 4, of a layer of press chip 9 approximately 1 mm thick, followed by a 0.145 mm thick layer of conductive paper 10 with a conductive pad 11 facing the winding 2, which in turn is 0.145 mm thick thick paper layer 12 is covered.
  • 1 mm thick layers of pressboard 13 and 14 are provided above these layers.
  • at least the paper layers 10 and 12 are glued together point by point.
  • the conductive pad 11 itself is very thin and therefore relatively high resistance. Since a substantial part of the conductive pad 11 lies at a distance of 1.145 mm above the main laminated core of the lower yoke 4 and the distance of the conductive pad 11 from the end face of the windings 2 is very much greater, the conductive pad 11 practically does this due to capacitive coupling Potential of the lower yoke 4 without being electrically connected to it. This makes it possible to dispense with a low-resistance articulated grating for the conductive support 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Transformers For Measuring Instruments (AREA)

Claims (10)

1. Corps-écran constitué par plusieurs couches d'une substance isolante (9, 12, 13, 14) et par une garniture de papier conducteur (10) pour des culasses de noyaux de fer, lamellés et en gradins, de transformateurs et de bobines de réactance, en vue de la protection par écran du bord des gradins de culasse contre les surfaces frontales ou l'écran statique d'extrémité d'enroulements, caractérisé par le fait,
- que la garniture en papier conducteur (10) est séparée galvaniquement et complètement de tous les éléments voisins (2, 4) et portés respectivement à des tensions,
- que la couche conductrice (11) dans la garniture à papier conducteur (10) est fortement ohmique et dépourvue de conducteurs de compensation de tension,
- que le potentiel électrique de la garniture conductrice (10) est ajusté, par voie purement capacitive, par le rapport entre la distance culasse (4) - garniture de papier conducteur et la distance garniture de papier conducteur (10) - surface frontale ou anneau statique d'extrémité des enroulements (2), et
- que les bords de la garniture du papier conducteur (10) sont de toutes parts en retrait sur les bords des autres couches de substance isolante (9, 12, 13, 14).
2. Corps-écran selon la revendication 1, caractérisé par le fait que la couche de substance isolante (9) est constituée par une couche disposée entre la culasse (4) et la garniture de papier conducteur (10).
3. Corps-écran selon les revendications 1 et 2, caractérisé par le fait que la garniture de papier conducteur (10) est recouverte, sur le côté qui est éloigné de la culasse (4), d'une couche d'une matière électriquement conductrice (11), et est, sur ce côté, recouverte par une couche de papier (12), non enduite.
4. Corps-écran selon les revendications 1 à 3, caractérisé par le fait que la garniture de papier conducteur (10) et la couche de papier (12) qui est située sur son côté enduit, ont respectivement une épaisseur de 0,145 mm, et que toutes les autres couches de substance isolante (9, 13, 14) sont constituées par un papier fort ou par du presspahn ayant une épaisseur d'environ 1 mm.
5. Corps-écran selon les revendications 1 à 4, caractérisé par le fait que les garnitures de papier conducteur (10) recouvrent, sur les deux côtés, au moins trois gradins dans le sens périphérique de la culasse (4), à l'exception du paquet de tôles médian.
6. Corps-écran selon les revendications 1 à 5, caractérisé par le fait que les garnitures de papier conducteur (10) sont adaptées, dans la direction longitudinale de la culasse (4), respectivement à la ligne de passage de la culasse (4) par rapport à la branche de noyaux (1).
7. Corps-écran selon les revendications 1 à 6, caractérisé par le fait qu'au moins la garniture de papier conducteur (10) est collée, par points, avec au moins une couche de substance isolante (9, 12, 13, 14) voisine.
8. Corps-écran selon les revendications 1 à 7, caractérisé par le fait que les bords du corps-écran (6) qui sont parallèles aux gradins, sont recourbés en direction de la culasse (4), selon un angle d'environ 90°.
9. Corps-écran selon les revendications 1 à 8, caractérisé par le fait que les bords des couches de substance isolante (9, 10, 12, 13, 14), qui sont parallèles aux gradins, sont assemblés par des capots disposés à une certaine distance l'un de l'autre et entourant les bords.
EP81108636A 1981-03-20 1981-10-21 Corps d'écran pour culasses de noyaux de fer dans des transformateurs et dans des bobines de réactance Expired EP0061521B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81108636T ATE9628T1 (de) 1981-03-20 1981-10-21 Schirmkoerper fuer joche von eisenkernen von transformatoren und drosselspulen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3111100 1981-03-20
DE19813111100 DE3111100A1 (de) 1981-03-20 1981-03-20 Schirmkoerper fuer joche von eisenkernen von transformatoren und drosselspulen

Publications (2)

Publication Number Publication Date
EP0061521A1 EP0061521A1 (fr) 1982-10-06
EP0061521B1 true EP0061521B1 (fr) 1984-09-26

Family

ID=6127909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108636A Expired EP0061521B1 (fr) 1981-03-20 1981-10-21 Corps d'écran pour culasses de noyaux de fer dans des transformateurs et dans des bobines de réactance

Country Status (4)

Country Link
EP (1) EP0061521B1 (fr)
JP (1) JPS57167613A (fr)
AT (1) ATE9628T1 (fr)
DE (2) DE3111100A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116250053A (zh) * 2020-09-23 2023-06-09 西门子能源国际公司 用于变压器的线圈的屏蔽设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1274213B (de) * 1959-08-10 1968-08-01 Licentia Gmbh Schirmkoerper fuer Transformatoren und Drosselspulen mit in den Isolierstoff eingelegten leitenden Belaegen
DE1513997B2 (de) * 1966-02-16 1972-08-31 Abschirmflaeche fuer transformatoren, drosselspulen und dgl. hochspannungsgeraete
DE1563219A1 (de) * 1966-05-12 1969-11-27 Licentia Gmbh Anordnung zur Abschirmung der Joche von Eisenkernen von Transformatoren
DE3022070C2 (de) * 1980-06-12 1986-05-07 Transformatoren Union Ag, 7000 Stuttgart Schirmkörper für bewickelte Kernschenkel von Transformatoren, Drosselspulen u.dgl.

Also Published As

Publication number Publication date
ATE9628T1 (de) 1984-10-15
JPS57167613A (en) 1982-10-15
EP0061521A1 (fr) 1982-10-06
DE3111100A1 (de) 1982-09-30
DE3166352D1 (en) 1984-10-31

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