EP0061521A1 - Shielding element for yokes of iron cores in transformers and in inductance coils - Google Patents
Shielding element for yokes of iron cores in transformers and in inductance coils Download PDFInfo
- Publication number
- EP0061521A1 EP0061521A1 EP81108636A EP81108636A EP0061521A1 EP 0061521 A1 EP0061521 A1 EP 0061521A1 EP 81108636 A EP81108636 A EP 81108636A EP 81108636 A EP81108636 A EP 81108636A EP 0061521 A1 EP0061521 A1 EP 0061521A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paper insert
- yoke
- conductive
- insert
- conductive paper
- 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
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 17
- 239000004020 conductor Substances 0.000 claims abstract description 10
- 239000011810 insulating material Substances 0.000 claims description 10
- 230000035515 penetration Effects 0.000 claims description 2
- 238000012216 screening Methods 0.000 abstract 4
- 229910052742 iron Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
Images
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 edges of the yoke against end faces or end shield rings of windings.
- these 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 lattice which also covers them and is also made of electrically conductive material, in order 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.
- 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 guide paper insert advantageously covers at least three steps in the circumferential direction of the yoke in addition to the central laminated core on both sides 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 point by point to at least one of its neighboring insulating material 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 material layers are held together by caps arranged at a distance from one another and encompassing 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 end insulation 3.
- the core leg 1 is in a manner not shown with a lower yoke 4 so that the lower yoke 4 and the core leg 1 hold and support each other mechanically.
- the press forces required for this are in Usually applied by bandages and / or press irons and / or press bolts.
- plates 5 are provided of insulating material, which the windings 2 facing surfaces form, together with the winding-side surface of the lower yoke 4 the winding table, on which the windings 2 in a not shown manner by are supported at the bottom.
- 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 packing 7 and 8 are, for example, made of wood, pressboard or press. made of 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 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 is 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 much larger, 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)
- Transformers For Measuring Instruments (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
Description
Die Erfindung betrifft Schirmkörper aus mehreren Isolierstofflagen mit einer Leitpapiereinlage für Joche von gestuft lamellierten Eisenkernen von Transformatoren und Drosselspulen zur Schirmung der Jochstufenkanten gegen Stirnflächen bzw. Endschirmringe von Wicklungen.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 edges of the yoke against end faces or end shield rings of windings.
Entsprechend den in den deutschen Patentanmeldungen P 30 10 255.7 und P 30 22 070.3 beschriebenen Schirmkörper sind diese üblicherweise aus mehreren Lagen von Isolierstoffen aufgebaut, zwischen denen mindestens eine Schicht aus elektrisch leitendem Werkstoff vorgesehen ist. Diese elektrisch leitenden Schichten sind bei den bekannten Anordnungen mit einem sie abdeckenden niederohmigen Gitter aus ebenfalls elektrisch leitendem Werkstoff verbunden, um dadurch das Auftreten von Spannungsdifferenzen innerhalb der zur Schirmung vorgesehenen Schicht aus elektrisch leitendem Werkstoff zu verhindern. Diese Gitter sind üblicherweise aus Kupferlitze oder Kupfergewebeband hergestellt und mit einem Anschlußleiter aus dem eigentlichen Schirmkörper herausgeführt, sowie galvanisch mit dem abzuschirmenden Bauteil verbunden.According to the shield bodies described in German patent applications P 30 10 255.7 and P 30 22 070.3, these are usually made up of several layers of insulating material, between which at least one layer of electrically conductive material is provided. In the known arrangements, these electrically conductive layers are connected to a low-resistance lattice which also covers them and is also made of electrically conductive material, in order 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.
Nachteilig ist bei diesen Anordnungen der nicht unwesentliche Aufwand zur Einbringung dieses niederohmigen Gitters und dabei insbesondere die mechanische Sicherung des aus.dem Schirmkörper herausgeführten Anschlußleiters. Darüber hinaus bewirkt gerade dieser Anschlußleiter eine Inhomogenität im elektrischen Feld und erfordert aufgrund seiner vergleichsweise niedrigen mechanischen Festigkeit und seiner schwachen Verankerung im Schirmkörper besondere Vorsichtsmaßnahmen während des Zusammenbaus des zu schirmenden Eisenkerns mit den zugehörigen Wicklungen.A disadvantage of these arrangements is the not insignificant effort for introducing this low-resistance grid and, in particular, the mechanical securing of the protruding element final leader. In addition, this connecting conductor causes an inhomogeneity in the electrical field and, because of its comparatively low mechanical strength and its weak anchoring in the shield body, requires special precautionary measures during the assembly of the iron core to be shielded with the associated windings.
Der Erfindung liegt daher die Aufgabe zugrunde, für Transformatoren und Drosselspulen für deren den Wicklungen zugekehrte Jochteile einen Schirmkörper zu schaffen, der sowohl einfach herzustellen als auch ohne Komplikationen einbaubar ist und dabei die an ihn gestellten physikalischen Anforderungen gut erfüllt.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.
Erfindungsgemäß wird diese Aufgabe bei einem Schirmkörper der eingangs genannten Art dadurch gelöst, daß die Leitpapiereinlage galvanisch vollständig von allen benachbarten und gegeneinander Spannung führenden Teilen getrennt ist, daß die Leitschicht in der Leiteinlage hochohmig und frei von Spannungsausgleichsleitern ist, daß das von der Leiteinlage geführte elektrische Potential rein kapazitiv durch das Verhältnis des Abstandes Jocheisen - Leitpapiereinlage zu dem Abstand Leitpapiereinlage - Stirnfläche bzw. Endschirmring der Wicklungen eingestellt ist und daß die Ränder der Leitpapiereinlage auf allen Seiten gegenüber den Rändern der übrigen Isolierstoffschichten zurückstehen.According to the invention, 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.
Nach vorteilhaften Weiterbildungen der Erfindung ist vorgesehen, daß die Isolierstofflage zwischen dem Jocheisen und der Leitpapiereinlage einschichtig ist und daß die Leitpapiereinlage auf der dem Jocheisen abgekehrten Seite mit elektrisch leitendem Werkstoff beschichtet und auf dieser Seite durch eine unbeschichtete Papierlage abgedeckt ist.According to advantageous developments of the invention it is provided that 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.
Vorteilhaft überdeckt die Leitpapiereinlage in Umfangsrichtung des Joches außer dem mittleren Blechpaket nach beiden Seiten wenigstens drei Stufen und ist sie in Längsrichtung des Joches jeweils an die Durchdringungslinie des Joches mit einem Kernschenkel angepaßt.The guide paper insert advantageously covers at least three steps in the circumferential direction of the yoke in addition to the central laminated core on both sides and is adapted in the longitudinal direction of the yoke to the penetration line of the yoke with a core leg.
Zur sicheren Fixierung der Leitpapiereinlage ist diese mit wenigstens einer ihrer benachbarten Isolierstofflagen punktweise verklebt und sind die stufenparallelen Ränder des Schirmkörpers in Richtung auf das Joch abgebogen. Die stufenparallelen Ränder der Isolierstofflagen sind gemäß einem weiteren Fortbildungsmerkmal der Erfindung von im Abstand zueinander angeordneten, die Ränder umfassenden Kappen zusammengehalten.To securely fix the conductive paper insert in place, it is glued point by point to at least one of its neighboring insulating material layers and the step-parallel edges of the shield body are bent in the direction of the yoke. According to a further development feature of the invention, the step-parallel edges of the insulating material layers are held together by caps arranged at a distance from one another and encompassing the edges.
Der erfindungsgemäß ausgebildet Schirmkörper ist sehr vorteilhaft, denn er ist aufgrund seines einfachen Aufbaus auch einfach herstellbar und gewährleistet in Folge von nicht erforderlichen Anschlußleitern eine extrem große Betriebssicherheit.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.
Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert.
- Fig. 1 zeigt den Querschnitt durch ein Joch eines Transformators mit mehreren bewickelten Kernschenkeln und
- Fig. 2 eine Einzelheit bei X in Fig. 1 in sehr stark vergrößertem Maßstab.
- Fig. 1 shows the cross section through a yoke of a transformer with several wound core legs and
- Fig. 2 shows a detail at X in Fig. 1 on a very greatly enlarged scale.
Ein Kernschenkel 1 trägt Wicklungen 2 mit einer stirnseitigen Isolierung 3. Der Kernschenkel 1 ist in nicht näher dargestellter Art und Weise mit einem unteren Joch 4 so verzahnt, daß sich das untere Joch 4 und der Kernschenkel 1 gegenseitig mechanisch halten und stützen. Die hierzu erforderlichen Preßkräfte sind in üblicher Weise durch Bandagen und/oder Preßeisen und/oder Preßbolzen aufgebracht.A core leg 1 carries windings 2 with end insulation 3. The core leg 1 is in a manner not shown with a lower yoke 4 so that the lower yoke 4 and the core leg 1 hold and support each other mechanically. The press forces required for this are in Usually applied by bandages and / or press irons and / or press bolts.
Seitlich anschließend an die beiden Längsseiten des unteren Joches 4 sind Platten 5 aus Isolierwerkstoff vorgesehen, deren den Wicklungen 2 zugekehrte Oberflächen zusammen mit der wicklungsseitigen Oberfläche des unteren Joches 4 den Wicklungstisch bilden, auf dem die Wicklun- gen 2 in nicht dargestellter Art und Weise nach unten abgestützt sind. Diese Platten 5 überdecken dabei die weiter außen liegenden Blechpakete des im Querschnitt stufenförmig an eine vorgegebene Kurvenform angepaßten lamellierten unteren Joches 4.Laterally adjoining the two longitudinal sides of the lower yoke 4 plates 5 are provided of insulating material, which the windings 2 facing surfaces form, together with the winding-side surface of the lower yoke 4 the winding table, on which the windings 2 in a not shown manner by are supported at the bottom. 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.
In Folge der üblichen Erdung des unteren Joches 4 und der auf Hochspannungspotential liegenden Wicklungen 2 besteht zwischen diesen beiden Baugruppen ein erheblicher Potentialunterschied, zu dessen leichterer und sichererer Beherrschung zumindest bei sehr hohen Nennspan-. nungen sowohl die Wicklungen 2 als auch das Stufen aufweisende untere Joch 4 mit großflächigen Abschirmungen versehen sind. Die wicklungsseitige Abschirmung ist beim Ausführungsbeispiel in nicht näher dargestellter Art und Weise in die stirnseitige Isolierung 3 der Wicklungen eingebaut.As a result of the usual grounding of the lower yoke 4 and the windings 2 lying at high voltage potential, there is a considerable potential difference between these two assemblies, for easier and safer control, at least at very high nominal voltages. Both the windings 2 and the stepped lower yoke 4 are provided with large-area shields. In the exemplary embodiment, 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.
Zur Abschirmung des unteren Joches 4 dient ein Schirmkörper 6, der im Zwischenraum zwischen den Platten 5 über dem unteren Joch 4 angeordnet ist. Zur mechanischen Unterstützung des dünnwandig ausgeführten Schirmkörpers 6 dienen Füllkörper 7 und 8, die die von den Stufen des unteren Joches 4 und dem Schirmkörper 6 eingeschlossenen Stufenräume ausfüllen. Die Füllkörper 7 und 8 sind beispielsweise aus Holz, Preßspan oder Preß-. holz hergestellt.A
Fig. 2 zeigt in stark vergrößertem Maßstab den schichtweisen Aufbau des Schirmkörpers 6 aus Isolierstofflagen. Diese Isolierstofflagen bestehen beginnend auf der dem unteren Joch 4 zugekehrten Seite des Schirmkörpers 6 aus einer Schicht etwa 1 mm starken Preßspans 9, gefolgt von einer 0,145 mm starken Schicht Leitpapiers 10 mit einer der Wicklung 2 zugekehrten leitenden Auflage 11, die wiederum von einer 0,145 mm starken Papierschicht bedeckt ist. Über diesen Schichten sind beim Ausführungsbeispiel noch jeweils 1 mm starke Schichten aus Preßspan 13 und 14 vorgesehen. Zur gegenseitigen Lagesicherung der einzelnen Schichten sind mindestens die Papierlagen 10 und 12 punktweise miteinander verklebt.Fig. 2 shows on a greatly enlarged scale the layered structure of the
Die leitende Auflage 11 selbst ist sehr dünn und dadurch verhältnismäßig hochohmig. Da ein wesentlicher Teil der leitenden Auflage 11 in einem Abstand von 1,145 mm über dem Hauptblechpaket des unteren Joches 4 liegt und der Abstand der leitenden Auflage 11 von der Stirnseite der Wicklungen 2 sehr viel größer ist, führt die leitende Auflage 11 aufgrund kapazitiver Kopplung praktisch das Potential des unteren Joches 4, ohne galvanisch mit diesem verbunden zu sein. Dadurch ist es möglich, auch auf ein niederohmiges Anlenkgitter für die leitende Auflage 11 zu verzichten.The
Wie darüber hinaus Versuche gezeigt haben, ergibt sich ein besonders günstiger Feldverlauf, wenn die zur Jochachse parallelen Längskanten des Schirmkörpers 6 um etwa 90° abgebogen sind und sich mit ihren Rändern an eine Stufenkante des unteren Joches 4 anlegen.As tests have also shown, there is a particularly favorable field profile if the longitudinal edges of the
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT81108636T ATE9628T1 (en) | 1981-03-20 | 1981-10-21 | SHIELDING BODY FOR YOCHES OF IRON CORES OF TRANSFORMERS AND CHOKE COILS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813111100 DE3111100A1 (en) | 1981-03-20 | 1981-03-20 | UMBRELLA BODY FOR JOCHE OF IRON CORES OF TRANSFORMERS AND THROTTLE COILS |
| DE3111100 | 1981-03-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0061521A1 true EP0061521A1 (en) | 1982-10-06 |
| EP0061521B1 EP0061521B1 (en) | 1984-09-26 |
Family
ID=6127909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81108636A Expired EP0061521B1 (en) | 1981-03-20 | 1981-10-21 | Shielding element for yokes of iron cores in transformers and in inductance coils |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0061521B1 (en) |
| JP (1) | JPS57167613A (en) |
| AT (1) | ATE9628T1 (en) |
| DE (2) | DE3111100A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022061601A1 (en) * | 2020-09-23 | 2022-03-31 | Siemens Gas And Power Gmbh & Co. Kg | Shielding device for an coil of transformer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1274213B (en) * | 1959-08-10 | 1968-08-01 | Licentia Gmbh | Shield body for transformers and choke coils with conductive linings embedded in the insulating material |
| DE1563219A1 (en) * | 1966-05-12 | 1969-11-27 | Licentia Gmbh | Arrangement for shielding the yokes of iron cores of transformers |
| DE1513997B2 (en) * | 1966-02-16 | 1972-08-31 | SCREENING AREA FOR TRANSFORMERS, REACTORS AND THE LIKE. HIGH VOLTAGE DEVICES | |
| DE3022070A1 (en) * | 1980-06-12 | 1981-12-17 | Transformatoren Union Ag, 7000 Stuttgart | Screen for wound transformer core shanks - is used as coil former and consists of thin-wall insulating tube with layers of impregnated paper |
-
1981
- 1981-03-20 DE DE19813111100 patent/DE3111100A1/en not_active Withdrawn
- 1981-10-21 DE DE8181108636T patent/DE3166352D1/en not_active Expired
- 1981-10-21 AT AT81108636T patent/ATE9628T1/en not_active IP Right Cessation
- 1981-10-21 EP EP81108636A patent/EP0061521B1/en not_active Expired
-
1982
- 1982-03-19 JP JP57044422A patent/JPS57167613A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1274213B (en) * | 1959-08-10 | 1968-08-01 | Licentia Gmbh | Shield body for transformers and choke coils with conductive linings embedded in the insulating material |
| DE1513997B2 (en) * | 1966-02-16 | 1972-08-31 | SCREENING AREA FOR TRANSFORMERS, REACTORS AND THE LIKE. HIGH VOLTAGE DEVICES | |
| DE1563219A1 (en) * | 1966-05-12 | 1969-11-27 | Licentia Gmbh | Arrangement for shielding the yokes of iron cores of transformers |
| DE3022070A1 (en) * | 1980-06-12 | 1981-12-17 | Transformatoren Union Ag, 7000 Stuttgart | Screen for wound transformer core shanks - is used as coil former and consists of thin-wall insulating tube with layers of impregnated paper |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022061601A1 (en) * | 2020-09-23 | 2022-03-31 | Siemens Gas And Power Gmbh & Co. Kg | Shielding device for an coil of transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE9628T1 (en) | 1984-10-15 |
| JPS57167613A (en) | 1982-10-15 |
| DE3111100A1 (en) | 1982-09-30 |
| EP0061521B1 (en) | 1984-09-26 |
| DE3166352D1 (en) | 1984-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19811021 |
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