EP0285895A1 - High voltage isolation device for transformers and inductances, especially destinated to high voltage direct current transmission - Google Patents

High voltage isolation device for transformers and inductances, especially destinated to high voltage direct current transmission Download PDF

Info

Publication number
EP0285895A1
EP0285895A1 EP88104507A EP88104507A EP0285895A1 EP 0285895 A1 EP0285895 A1 EP 0285895A1 EP 88104507 A EP88104507 A EP 88104507A EP 88104507 A EP88104507 A EP 88104507A EP 0285895 A1 EP0285895 A1 EP 0285895A1
Authority
EP
European Patent Office
Prior art keywords
voltage
pressboard
solid
barriers
arrangement according
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
Application number
EP88104507A
Other languages
German (de)
French (fr)
Other versions
EP0285895B1 (en
Inventor
Dieter Dipl.-Ing. Breitfelder
Walter Dr. Müller
Werner Dr. Stein
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
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT88104507T priority Critical patent/ATE73572T1/en
Publication of EP0285895A1 publication Critical patent/EP0285895A1/en
Application granted granted Critical
Publication of EP0285895B1 publication Critical patent/EP0285895B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H01F27/28—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
    • 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
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements

Definitions

  • the invention relates to a high-voltage insulation arrangement for transformers and choke coils, in particular for high-voltage direct current transmission (HVDC) with simultaneous loading by direct and alternating voltage and by surge voltages, with insulating sections consisting of successive sections alternating between solid insulating material and transformer oil.
  • HVDC high-voltage direct current transmission
  • the insulations are designed with regard to the loads caused by the AC voltage, and it has proven to be very advantageous that the dielectric constants of solid insulating materials to oil behave approximately as 2: 1.
  • the oil used for cooling in these devices contributes significantly to the electrical insulation of the live parts.
  • the invention is therefore based on the object of creating a high-voltage insulation arrangement for transformers and choke coils for high-voltage direct current transmission which can withstand simultaneous stresses from alternating, direct and surge voltage and which can nevertheless be implemented with only a small amount of manufacturing and other outlay.
  • This object is achieved according to the invention for transformers and choke coils by that solid barriers for adapting the direct voltage field to the alternating voltage field are made of pressboard with increased electrical conductivity graded compared to conventional pressboard, - That the specific resistance of the press chip with the highest electrical conductivity is only about 2 to 10 times greater than that of the transformer oil, the dielectric constant is independent of the size of its specific resistance about twice as large as that of the transformer oil and - That the press chip with the highest electrical conductivity is arranged at the end of the insulating section at which the equipotential surfaces of the DC voltage field have smaller radii of curvature than at the other end.
  • Advantageous embodiments of the invention consist in that some or all of the solid barriers are made of electrically conductive paper, that all solid barriers are of the same thickness and that the distances between the solid barriers from one another increase with the distance from the highest direct voltage potential.
  • the solid barriers are designed as concentric cylinder jackets and, in the case of a transformer, comprise the connection point of the inner connection of a bushing with the high-voltage discharge of a winding, or the insulating material barriers are designed as angle rings and comprise the high-voltage end of a transformer winding.
  • the high-voltage insulation arrangement according to the invention is very advantageous because it can be carried out with a minimum of specifically practically uniformly stressed solid barriers, because the dielectric constant of the press chip remains unchanged even with increased conductivity, so that due to the increased conductivity of the solid barriers, the direct voltage field does not, however, do so due to the dielectric constant certain alternating field is changed. Accordingly, there is an advantageous application for the insulation arrangement according to the invention wherever inhomogeneous DC voltage fields occur. This is, for example, for the edge insulation of the valve windings of HVDC transformers as well as for their rejection until implementation and the case with DC cables.
  • a conductor pin 1 carries a paper roll 2 and is part of a high-voltage bushing with a porcelain body for connecting electrical devices, for example transformers, choke coils or rectifiers, to a high-voltage direct current transmission line.
  • electrical devices for example transformers, choke coils or rectifiers
  • the potential carried by the conductor pin 1 is capacitively reduced at least in the region of a flange for fastening the bushing on a device cover to zero or neutral point potential.
  • the paper roll 2 is mechanically held together by a porcelain cap 4 concentrically enveloping it and is relieved of stress.
  • the porcelain cap 4 extends to a flange carrying the bushing and separates the oil-filled space of the connected electrical device from an oil chamber 3 of the bushing.
  • the conductor pin 1 carries at its lower end a clamping plate 5 to which a contact piece 7 carried by the upper end of a flexible conductor cable 6 can be screwed.
  • the lower end of the conductor cable 6 is firmly connected by a further contact piece 8 to a clamping plate 9 on the free end of a winding lead 10.
  • the conductor cable 6 with its contact pieces 7 and 8, clamping pieces 5 and 9 as well as the free ends of the conductor bolt 1 and the winding lead 10 are in the operating position in a goblet-shaped shield body 11, the inner surfaces of which electrically conductive layer, for example made of copper, and the outward-facing side consists of a plurality of paper layers or pressboard.
  • the parts carrying high voltage potential, in particular the conductor cable 6, are galvanically connected to the electrically conductive layer on the inside of the shield body 11.
  • the porcelain cap 4 and the screen body 11 are concentrically surrounded by an inner solid barrier 12 and from the inside to the outside by cylindrical jacket-shaped solid barriers 13, 14, 15, 16 and 17.
  • An oil channel 18 is located between radially successive solid barriers 12 to 17.
  • the clear width of oil channels 18 increases with the distance from solid barrier 12.
  • Solid barrier 12 is retracted radially at the top of screen body 11 and carries a collar 19 there which includes the lower end of the solid barrier 13 outside.
  • the solid barriers 12 to 17 and the oil channels 18 are surrounded on the outside by a dome wall 20 concentric to them. The only partially shown dome carries the above-mentioned high voltage bushing on its upper flange.
  • the solid barriers 11, 12 to 17 consist of pressboard in the illustrated embodiment. 11, 12 and 13 pressboard with increased conductivity compared to normal pressboard is used to produce the solid barriers.
  • the pressboard used in both solid barriers 11 and 12 has a specific electrical resistance that only corresponds to 2 to 10 times the value of the specific resistance of the transformer oil.
  • the solid barrier 17 is made of normal pressboard, the specific resistance of which corresponds to approximately 100 times the specific resistance of the transformer oil.
  • the specific resistances of the pressboard types from which the solid barriers 13, 14, 15 and 16 are made are graded so that in any case for the specific resistances of neighboring solid barriers give the same ratio.
  • the dielectric constant of all types of pressboard used is the same.
  • the alternating voltage field is also constructed analogously to that of conventional solid barriers.
  • the direct voltage field is approximately analogous to the alternating voltage field.
  • the high-voltage side due to the lowering of the specific resistance of the press chip down to the order of magnitude of the specific resistance of the transformer oil, and on the other hand, on the side of the isolating path that leads to zero potential, there is an increased field strength of the DC voltage field in the solid-state barrier 17 due to the normal press chip in the solid-state barrier 17, which is significantly higher resistance than the transformer oil avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

In electrical apparatuses of high-voltage direct current (HVDC) transmission systems, AC and DC voltage fields occur simultaneously alongside one another. In apparatuses of such systems the use of different materials as insulating materials to form insulating paths is unavoidable at some points. In consequence, heavily distorted electrical fields are produced from time to time because of the different characteristics of the dielectric constants and the specific resistances. According to the invention, to match the DC voltage field to the AC voltage field, solid material barriers (12 to 17) of pressboard are constructed, having an electrical conductivity increased in a graduated manner with respect to conventional pressboard, the specific resistance of the pressboard having the highest electrical conductivity being only approximately 2 to 10 times greater than that of the transformer oil, and the pressboard barriers (12, 13) having the highest electrical conductivity in each case being arranged at the end of the insulating path at which the field lines have the smaller radii of curvature. The high-voltage insulation arrangement according to the invention is advantageously suitable for the insulation of the inner end of high-voltage ducts and for the insulation of the high-voltage winding of transformers and inductances for HVDC transmission. <IMAGE>

Description

Die Erfindung betrifft eine Hochspannungsisolationsanordnung für Transformatoren und Drosselspulen, insbesondere zur Hoch­spannungs-Gleichstrom-Übertragung (HGÜ) mit gleichzeitiger Be­anspruchung durch Gleich- und Wechselspannung sowie durch Stoß­spannungen, wobei Isolierstrecken aus aufeinanderfolgenden Teilstrecken abwechselnd aus festem Isolierwerkstoff und aus Transformatoröl bestehen.The invention relates to a high-voltage insulation arrangement for transformers and choke coils, in particular for high-voltage direct current transmission (HVDC) with simultaneous loading by direct and alternating voltage and by surge voltages, with insulating sections consisting of successive sections alternating between solid insulating material and transformer oil.

Bei der Übertragung von elektrischer Energie in sehr großen Mengen über extrem weite Entfernungen hat sich infolge der ge­ringen Blindleistungsverluste die Hochspannungs-Gleichstrom-­Übertragung als sehr wirtschaflich erwiesen. Gleichzeitig hat sich als sehr zweckmäßig herausgestellt, bei der Erzeugung der elektrischen Energie in Generatoren und bei der Verteilung der Energie an die Verbraucher die bisher übliche Arbeitsweise mit Wechsel- und Drehstrom beizubehalten. Daraus ergibt sich die Notwendigkeit den in Wechsel- oder Drehstromgeneratoren erzeug­ten Strom vor dem Transport über eine HGÜ-Anlage gleichzurich­ten sowie gleichzeitig auf ein Hochspannungspotential anzuheben und entsprechend am Ende der Übertragungsleitung das Hochspan­nungspotential zu verringern und den Gleichstrom in Wechsel- ­oder Drehstrom zurückzuverwandeln.When transmitting electrical energy in very large quantities over extremely long distances, high-voltage direct current transmission has proven to be very economical due to the low reactive power losses. At the same time, it has proven to be very expedient to maintain the previously customary mode of operation with alternating and three-phase current when generating the electrical energy in generators and when distributing the energy to the consumers. This results in the need to rectify the electricity generated in AC or three-phase generators before transporting them via an HVDC system and at the same time to raise them to a high-voltage potential and correspondingly reduce the high-voltage potential at the end of the transmission line and convert the direct current back into alternating or three-phase current.

In den hierbei eingesetzten Transformatoren und Drosselspulen treten unvermeidlich nebeneinander sowohl hohe Wechsel- als auch hohe Gleichspannungen auf. Außerdem müssen diese Geräte bei der Prüfung und im Betrieb unbeschadet auch hohen Stoßspan­nungsbeanspruchungen widerstehen.Both high alternating and high direct voltages inevitably occur side by side in the transformers and choke coils used here. In addition, these devices must withstand high impulse voltage stresses during testing and during operation.

In bisher bekannten Transformatoren und Drosselspulen der Wech­sel- und Drehstromübertragungseinrichtungen sind die Isolierun­gen mit Rücksicht auf die durch die Wechselspannung bedingten Belastungen ausgelegt, wobei sich als sehr vorteilhaft erwiesen hat, daß sich die Dielektrizitätskonstanten von festen Isolier­werkstoffen zu Öl etwa wie 2 : 1 verhalten. Das in diesen Gerä­ten an sich zur Kühlung dienende Öl trägt dadurch einen wesent­lichen Anteil zur elektrischen Isolierung der spannungführenden Teile bei.In previously known transformers and choke coils of the AC and three-phase transmission devices, the insulations are designed with regard to the loads caused by the AC voltage, and it has proven to be very advantageous that the dielectric constants of solid insulating materials to oil behave approximately as 2: 1. The oil used for cooling in these devices contributes significantly to the electrical insulation of the live parts.

Eine Übertragung dieser Verhältnisse auf Geräte die neben einer Wechselspannung auch durch eine Gleichspannung beansprucht sind ist jedoch nicht möglich, weil sich die spezifischen Widerstän­de der üblichen festen Isoliermittel Papier oder Preßspan zu dem von Öl etwa wie 100: 1 verhalten. Das hat bei unveränder­ter Übernahme der von Wechsel- und Drehstromgeräten her bekann­ten Isolieranordnungen zur Folge, daß praktisch die gesamte Gleichspannung an der festen Isolierung abfällt. Zur Vermei­dung von Durchschlägen und zur Erhaltung der Betriebssicherheit muß also die feste Isolierung verstärkt werden. Dies ist jedoch aus physikalischen und insbesondere aus thermischen Gründen sehr nachteilig und aus fertigungstechnischen Gründen sehr schwierig und an einigen Stellen, wie beispielsweise der Wick­lungsisolierung aus Platzgründen nahezu unmöglich.However, it is not possible to transfer these conditions to devices that are not only subjected to an alternating voltage but also to a direct voltage, because the specific resistances of the usual solid insulating media, paper or pressboard, to oil are approximately 100: 1. If the insulation arrangements known from AC and three-phase devices are adopted unchanged, this has the consequence that practically the entire DC voltage drops across the fixed insulation. In order to avoid breakdowns and to maintain operational safety, the solid insulation must be reinforced. However, this is very disadvantageous for physical and especially for thermal reasons and very difficult for manufacturing reasons and is almost impossible in some places, such as the winding insulation, for reasons of space.

Beispielsweise sind bei einer rotationssymmetrischen konischen Kondensatordurchführung mit Abschirmelektrode am ölseitigen An­schluß die Auslegungsprinzipien gegenüber beiden Spannungsarten nur schwer miteinander vereinbar. Die bei transienten Spannun­gen wirksame Kondensator-Steuerung der Spannung im Durchfüh­rungswickel wird ohne zusätzliche Barrieren durch das leit­fähige Öl bei Gleichspannung völlig verzerrt. Konzentrisch den Wickel umhüllende Preßspanbarrieren haben im Zylinderfeld der­art unterschiedliche Isolierwiderstände gegenüber den zwischen den Barrieren liegenden Ölschichten, daß ein großer Teil der gesamten Gleichspannung an der innersten Barriere konzentriert ist. Insbesondere gilt dies auch für die Feststoff-Beschichtung der Oberfläche von Schirmelektroden.For example, in the case of a rotationally symmetrical conical capacitor bushing with a shielding electrode on the oil-side connection, the design principles with respect to both types of voltage are difficult to reconcile with one another. The capacitor control of the voltage in the feedthrough winding, which is effective for transient voltages, is completely distorted by the conductive oil at DC voltage without additional barriers. Pressboard barriers concentrically enveloping the winding have such different insulation resistances in the cylinder field with respect to the oil layers lying between the barriers that a large part of the total DC voltage is concentrated on the innermost barrier is. In particular, this also applies to the solid coating of the surface of shield electrodes.

Als Abhilfemaßnahme ist beispielsweise durch die DE-OS 20 62 157 bekannt, mit Isolierwerkstoff beschichtete Schirmelektroden zu unterteilen, so daß durch einen entspre­chend dimensionierten Ölspalt der Isolationsstrom zur blanken Innenfläche abgeleitet wird und die Beschichtung von Gleich­spannung entlastet bleibt.As a remedial measure, it is known, for example from DE-OS 20 62 157, to divide shield electrodes coated with insulating material so that the insulation current is diverted to the bare inner surface through an appropriately dimensioned oil gap and the coating remains relieved of DC voltage.

Ebenfalls gemäß der DE-OS 20 62 157 ist als Abhilfe bekannt geworden, einen Teil der festen Isolierschichten mittels Über­zügen aus hochohmig leitenden Schichten abzuschirmen und da­durch die Gleichspannung praktisch ausschließlich in vom Trans­formatoröl gebildeten Schichten abzubauen. Dies führt jedoch folgerichtig in an sich unerwünschter Weise zu vergleichsweise großen ölgefüllten Abstandsräumen und damit insgesamt zu gegen­über ausschließlich mit Wechselspannungen belasteten Transfor­matoren und Drosselspulen zu größeren Gesamtabmessungen.Likewise according to DE-OS 20 62 157 it has become known as a remedy to shield part of the solid insulating layers by means of coatings made of high-resistance conductive layers and thereby to reduce the DC voltage practically exclusively in layers formed by the transformer oil. However, this consequently leads in an undesirable manner to comparatively large oil-filled spacing spaces and thus overall to larger overall dimensions compared to transformers and choke coils which are only loaded with alternating voltages.

Der Erfindung liegt daher die Aufgabe zugrunde, für Transfor­matoren und Drosselspulen zur Hochspannungs-Gleichstrom-Über­tragung eine Hochspannungsisolationsanordnung zu schaffen, die einer gleichzeitigen Beanspruchung durch Wechsel-, Gleich- und Stoßspannung standhält und die trotzdem mit nur geringem fer­tigungstechnischen und sonstigen Aufwand realisierbar ist.The invention is therefore based on the object of creating a high-voltage insulation arrangement for transformers and choke coils for high-voltage direct current transmission which can withstand simultaneous stresses from alternating, direct and surge voltage and which can nevertheless be implemented with only a small amount of manufacturing and other outlay.

Diese Aufgabe wird für Transformatoren und Drosselspulen er­findungsgemäß dadurch gelöst,
- daß Feststoffbarrieren zur Anpassung des Gleichspannungsfel­des an das Wechselspannungsfeld aus Preßspan mit gegenüber gewöhnlichem Preßspan abgestuft erhöhter elektrischer Leit­fähigkeit aufgebaut sind,
- daß der spezifische Widerstand des Preßspans mit der höchsten elektrischen Leitfähigkeit nur etwa um das 2- bis 10-fache größer ist als der des Transformatoröls, wobei die Dielektri­ zitätskonstante des Preßspans unabhängig von der Größe seines spezifischen Widerstandes etwa doppelt so groß ist wie die des Transformatoröls und
- daß der Preßspan mit der höchsten elektrischen Leitfähigkeit jeweils an dem Ende der Isolierstrecke angeordnet ist, an dem die Äquipotentialflächen des Gleichspannungsfeldes kleinere Krümmungsradien aufweisen als an dem anderen Ende.This object is achieved according to the invention for transformers and choke coils by
that solid barriers for adapting the direct voltage field to the alternating voltage field are made of pressboard with increased electrical conductivity graded compared to conventional pressboard,
- That the specific resistance of the press chip with the highest electrical conductivity is only about 2 to 10 times greater than that of the transformer oil, the dielectric constant is independent of the size of its specific resistance about twice as large as that of the transformer oil and
- That the press chip with the highest electrical conductivity is arranged at the end of the insulating section at which the equipotential surfaces of the DC voltage field have smaller radii of curvature than at the other end.

Vorteilhafte Ausgestaltungen der Erfindung bestehen darin, daß ein Teil oder alle der Feststoffbarrieren aus elektrisch leit­fähigem Papier aufgebaut sind, daß alle Feststoffbarrieren gleich dick sind und daß die Abstände der Feststoffbarrieren voneinander mit der Entfernung vom höchsten Gleichspannungspo­tential zunehmen.Advantageous embodiments of the invention consist in that some or all of the solid barriers are made of electrically conductive paper, that all solid barriers are of the same thickness and that the distances between the solid barriers from one another increase with the distance from the highest direct voltage potential.

Nach zweckmäßigen Ausgestaltungen der Erfindung sind die Fest­stoffbarrieren als konzentrische Zylindermäntel ausgeführt und umfassen bei einem Transformator die Verbindungsstelle des Innenanschlusses einer Durchführung mit der Hochspannungsaus­leitung einer Wicklung oder sind die Isolierstoffbarrieren als Winkelringe ausgeführt und umfassen das hochspannungsseitige Ende einer Transformatorwicklung.According to expedient embodiments of the invention, the solid barriers are designed as concentric cylinder jackets and, in the case of a transformer, comprise the connection point of the inner connection of a bushing with the high-voltage discharge of a winding, or the insulating material barriers are designed as angle rings and comprise the high-voltage end of a transformer winding.

Die erfindungsgemäße Hochspannungsisolationsanordnung ist sehr vorteilhaft, weil sie mit einem Minimum an spezifisch praktisch gleichmäßig beanspruchten Feststoffbarrieren ausführbar ist, denn die Dielektrizitätskonstante des Preßspans bleibt auch bei erhöhter Leitfähigkeit unverändert, so daß infolge der erhöh­ten Leitfähigkeit der Feststoffbarrieren zwar das Gleichspan­nungsfeld nicht jedoch das durch die Dielektrizitätskonstante bestimmte Wechselfeld verändert wird. Demzufolge ergibt sich für die erfindungsgemäße Isolationsanordnung eine vorteilhafte Anwendungsmöglichkeit überall dort, wo inhomogene Gleichspan­nungsfelder auftreten. Dies ist beispielsweise bei der Randiso­lation der Ventilwicklungen von HGÜ-Transformatoren sowie bei deren Ausleitungen bis zur Durchführung und bei Gleichspan­nungskabeln der Fall.The high-voltage insulation arrangement according to the invention is very advantageous because it can be carried out with a minimum of specifically practically uniformly stressed solid barriers, because the dielectric constant of the press chip remains unchanged even with increased conductivity, so that due to the increased conductivity of the solid barriers, the direct voltage field does not, however, do so due to the dielectric constant certain alternating field is changed. Accordingly, there is an advantageous application for the insulation arrangement according to the invention wherever inhomogeneous DC voltage fields occur. This is, for example, for the edge insulation of the valve windings of HVDC transformers as well as for their rejection until implementation and the case with DC cables.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeich­nung in einer Schnittdarstellung der Verbindungsstelle des Innenanschlusses einer Hochspannungsdurchführung mit dem Aus­leitungsende einer Transformatorwicklung näher erläutert.An embodiment of the invention is explained in more detail with reference to a drawing in a sectional view of the connection point of the inner connection of a high-voltage bushing with the lead-out end of a transformer winding.

Ein Leiterbolzen 1 trägt einen Papierwickel 2 und ist Teil ei­t näher dargestellten Hochspannungsdurchführung mit ei­nem Porzellankörper zum Anschluß von elektrischen Geräten, bei­spielsweise Transformatoren, Drosselspulen oder Gleichrichtern, an eine Hochspannungs-Gleichstrom-Übertragungsleitung. In der Vielzahl der Schichten des Papierwickels 2 wird das vom Leiter­bolzen 1 geführte Potential mindestens im Bereich eines Flan­sches zur Befestigung der Durchführung auf einem Gerätedeckel kapazitiv bis auf Null- oder Sternpunktpotential abgebaut.A conductor pin 1 carries a paper roll 2 and is part of a high-voltage bushing with a porcelain body for connecting electrical devices, for example transformers, choke coils or rectifiers, to a high-voltage direct current transmission line. In the multiplicity of layers of the paper roll 2, the potential carried by the conductor pin 1 is capacitively reduced at least in the region of a flange for fastening the bushing on a device cover to zero or neutral point potential.

Am unteren Ende der Durchführung ist der Papierwickel 2 durch eine ihn konzentrisch umhüllende Porzellankappe 4 mechanisch zusammengehalten und spannungsmäßig entlastet. Die Porzellan­kappe 4 erstreckt sich bis zu einem die Durchführung tragenden Flansch und trennt den ölgefüllten Raum des angeschlossenen elektrischen Gerätes von einem Ölraum 3 der Durchführung.At the lower end of the feedthrough, the paper roll 2 is mechanically held together by a porcelain cap 4 concentrically enveloping it and is relieved of stress. The porcelain cap 4 extends to a flange carrying the bushing and separates the oil-filled space of the connected electrical device from an oil chamber 3 of the bushing.

Der Leiterbolzen 1 trägt an seinem unteren Ende eine Klemmplat­te 5, an die ein vom oberen Ende eines flexiblen Leiterseils 6 getragenes Kontaktstück 7 anschraubbar ist. Das untere Ende des Leiterseiles 6 ist durch ein weiteres Kontaktstück 8 fest mit einer Klemmplatte 9 auf dem freien Ende einer Wicklungsauslei­tung 10 verbunden.The conductor pin 1 carries at its lower end a clamping plate 5 to which a contact piece 7 carried by the upper end of a flexible conductor cable 6 can be screwed. The lower end of the conductor cable 6 is firmly connected by a further contact piece 8 to a clamping plate 9 on the free end of a winding lead 10.

Das Leiterseil 6 mit seinen Kontaktstücken 7 und 8, Klemmstük-­ken 5 und 9 sowie die freien Enden des Leiterbolzens 1 und der Wicklungsausleitung 10 liegen in Betriebsstellung in einem kelchförmigen Schirmkörper 11, dessen Innenflächen von einer elektrisch leitenden Schicht, beispielsweise aus Kupfer, und dessen nach außen gekehrte Seite aus einer Vielzahl von Papier­schichten oder Preßspan besteht. Die Hochspannungspotential führenden Teile, insbesondere das Leiterseil 6, sind galvanisch mit der elektrisch leitenden Schicht auf der Innenseite des Schirmkörpers 11 verbunden.The conductor cable 6 with its contact pieces 7 and 8, clamping pieces 5 and 9 as well as the free ends of the conductor bolt 1 and the winding lead 10 are in the operating position in a goblet-shaped shield body 11, the inner surfaces of which electrically conductive layer, for example made of copper, and the outward-facing side consists of a plurality of paper layers or pressboard. The parts carrying high voltage potential, in particular the conductor cable 6, are galvanically connected to the electrically conductive layer on the inside of the shield body 11.

Die Porzellankappe 4 und der Schirmkörper 11 sind konzentrisch von einer inneren Feststoffbarriere 12 sowie von innen nach außen von zylindermantelförmigen Feststoffbarrieren 13, 14, 15, 16 und 17 umgeben. Zwischen radial aufeinanderfolgenden der Feststoffbarrieren 12 bis 17 befindet sich jeweils ein Ölkanal 18. Die lichte Weite der Ölkanäle 18 wächst mit dem Abstand von der Feststoffbarriere 12. Die Feststoffbarriere 12 ist in Höhe des oberen Randes des Schirmkörpers 11 radial eingezogen und trägt dort eine Manschette 19, die das untere Ende der Fest­stoffbarriere 13 außen umfaßt. Die Feststoffbarrieren 12 bis 17 und die Ölkanäle 18 sind nach außen von einer zu ihnen konzen­trischen Domwand 20 umfaßt. Der nur ausschnittsweise darge­stellte Dom trägt auf seinem oberen Flansch die oben erwähnte Hochspannungsdurchführung.The porcelain cap 4 and the screen body 11 are concentrically surrounded by an inner solid barrier 12 and from the inside to the outside by cylindrical jacket-shaped solid barriers 13, 14, 15, 16 and 17. An oil channel 18 is located between radially successive solid barriers 12 to 17. The clear width of oil channels 18 increases with the distance from solid barrier 12. Solid barrier 12 is retracted radially at the top of screen body 11 and carries a collar 19 there which includes the lower end of the solid barrier 13 outside. The solid barriers 12 to 17 and the oil channels 18 are surrounded on the outside by a dome wall 20 concentric to them. The only partially shown dome carries the above-mentioned high voltage bushing on its upper flange.

Die Feststoffbarrieren 11, 12 bis 17 bestehen beim dargestell­ten Ausführungsbeispiel aus Preßspan. Dabei ist zur Herstellung der Feststoffbarrieren 11, 12 und 13 Preßspan mit gegenüber nor­malem Preßspan erhöhter Leitfähigkeit verwendet. Der in beiden Feststoffbarrieren 11 und 12 eingesetzte Preßspan hat einen spezifischen elektrischen Widerstand, der nur dem 2- bis 10-fa­chen Wert des spezifischen Widerstandes des Transformatoröls entspricht. Dagegen ist die Feststoffbarriere 17 aus normalem Preßspan hergestellt, dessen spezifischer Widerstand etwa dem 100-fachen Wert des spezifischen Widerstandes des Transforma­toröls entspricht. Die spezifischen Widerstände der Preßspan­sorten, aus denen die Feststoffbarrieren 13, 14, 15 und 16 hergestellt sind, sind so abgestuft, daß sich in jedem Fall für die spezifischen Widerstände benachbarter Feststoffbarrieren das gleiche Verhältnis ergibt.The solid barriers 11, 12 to 17 consist of pressboard in the illustrated embodiment. 11, 12 and 13 pressboard with increased conductivity compared to normal pressboard is used to produce the solid barriers. The pressboard used in both solid barriers 11 and 12 has a specific electrical resistance that only corresponds to 2 to 10 times the value of the specific resistance of the transformer oil. In contrast, the solid barrier 17 is made of normal pressboard, the specific resistance of which corresponds to approximately 100 times the specific resistance of the transformer oil. The specific resistances of the pressboard types from which the solid barriers 13, 14, 15 and 16 are made are graded so that in any case for the specific resistances of neighboring solid barriers give the same ratio.

Die Dielektrizitätskonstante aller verwendeten Preßspansorten ist gleich groß.The dielectric constant of all types of pressboard used is the same.

Da die Dielektrizitätskonstante aller im Ausführungsbeispiel eingesetzten Feststoffbarrieren 11 bis 17 gleich der bei nor­malem Preßspan ist, ist auch das Wechselspannungsfeld analog dem bei üblichen Feststoffbarrieren aufgebaut.Since the dielectric constant of all solid barriers 11 to 17 used in the exemplary embodiment is the same as that of normal pressboard, the alternating voltage field is also constructed analogously to that of conventional solid barriers.

Durch die von der Feststoffbarriere 11 bis zur Feststoffbar­riere 17 stufenweise abnehmende Leitfähigkeit des verwendeten Preßspans ist das Gleichspannungsfeld etwa analog dem Wechsel­spannungsfeld. Einerseits ist auf der Hochspannungsseite durch die Absenkung des spezifischen Widerstandes des Preßspans bis auf die Größenordnung des spezifischen Widerstandes des Trans­formatoröls und andererseits ist auf der Nullpotential führen­den Seite der Isolierstrecke durch den gegenüber dem Transfor­matoröl deutlich höherohmigen normalen Preßspan in der Fest­stoffbarriere 17 eine erhöhte Feldstärke des Gleichspannungs­feldes vermieden.Due to the gradually decreasing conductivity of the press chip used from the solid barrier 11 to the solid barrier 17, the direct voltage field is approximately analogous to the alternating voltage field. On the one hand, on the high-voltage side due to the lowering of the specific resistance of the press chip down to the order of magnitude of the specific resistance of the transformer oil, and on the other hand, on the side of the isolating path that leads to zero potential, there is an increased field strength of the DC voltage field in the solid-state barrier 17 due to the normal press chip in the solid-state barrier 17, which is significantly higher resistance than the transformer oil avoided.

Analog zum beschriebenen Ausführungsbeispiel ist ein Aufbau von Isolierstrecken aus Transformatoröl und Feststoffbarrieren mit abgestuft erhöhten Leitfähigkeitswerten überall dort sinnvoll, wo gleichzeitig vorhandene Wechsel- und Gleichspannungsfelder zu beherrschen sind. Anstelle von Preßspan mit stufenweise ver­änderter elektrischer Leitfähigkeit ist auch der Einsatz ande­rer fester Isolierwerkstoffe, beispielsweise Papier, möglich soweit dabei die höchste Leitfähigkeit in der Größenordnung der Leitfähigkeit des Transformatoröls liegt.Analogous to the exemplary embodiment described, it is sensible to construct insulating sections made of transformer oil and solid barriers with gradually increased conductivity values wherever existing AC and DC voltage fields can be mastered at the same time. Instead of pressboard with gradually changing electrical conductivity, it is also possible to use other solid insulating materials, for example paper, as long as the highest conductivity is in the order of the conductivity of the transformer oil.

Claims (7)

1. Hochspannungsisolationsanordnung für Transformatoren und Drosselspulen, insbesondere zur Hochspannungs-Gleichstrom-­Übertragung (HGÜ), mit gleichzeitiger Beanspruchung durch Gleich- und Wechselspannung sowie durch Stoßspannungen, wobei Isolierstrecken aus aufeinanderfolgenden Teilstrecken abwech­selnd aus festen Isolierwerkstoffen und aus Transformatoröl be­stehen,
dadurch gekennzeichnet,
- daß Feststoffbarrieren (12 bis 17) zur Anpassung des Gleich­spannungsfeldes an das Wechselspannungsfeld aus Preßspan mit gegenüber gewöhnlichem Preßspan abgestuft erhöhter elektri­scher Leitfähigkeit aufgebaut sind,
- daß der spezifische Widerstand des Preßspans mit der höchsten elektrischen Leitfähigkeit nur etwa um das 2- bis 10-fache größer ist als der des Transformatoröls, wobei die Dielektri­zitätskonstante des Preßspans unabhängig von der Größe seines spezifischen Widerstandes etwa doppelt so groß ist wie die des Transformatoröls und
- daß der Preßspan mit der höchsten elektrischen Leitfähigkeit jeweils an dem Ende der Isolierstrecke angeordnet ist, an dem die Äquipotentialflächen kleinere Krümmungsradien aufweisen als an dem anderen Ende.1. High-voltage insulation arrangement for transformers and choke coils, in particular for high-voltage direct current transmission (HVDC), with simultaneous exposure to direct and alternating voltage and surge voltages, with insulating sections consisting of successive sections alternating between solid insulating materials and transformer oil,
characterized,
that solid barriers (12 to 17) for adapting the direct voltage field to the alternating voltage field are made of pressboard with increased electrical conductivity graded compared to normal pressboard,
- That the specific resistance of the press chip with the highest electrical conductivity is only about 2 to 10 times greater than that of the transformer oil, the dielectric constant of the press chip regardless of the size of its resistivity is about twice as large as that of the transformer oil and
- That the press chip with the highest electrical conductivity is arranged at the end of the insulating section at which the equipotential surfaces have smaller radii of curvature than at the other end. 2. Hochspannungsisolationsanordnung nach Anspruch 1, da­durch gekennzeichnet, daß ein Teil oder alle der Feststoffbarrieren (12 bis 17) aus elektrisch leit­fähigem Papier aufgebaut sind.2. High-voltage insulation arrangement according to claim 1, characterized in that part or all of the solid barriers (12 to 17) are made of electrically conductive paper. 3. Hochspannungsisolationsanordnung nach Anspruch 1 oder 2, dadurch gekennzeich net, daß alle Fest­stoffbarrieren (12 bis 17) gleich dick sind.3. High-voltage insulation arrangement according to claim 1 or 2, characterized in that all solid barriers (12 to 17) are of the same thickness. 4. Hochspannungsisolationsanordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Abstände der Feststoffbarrieren (12 bis 17) voneinander mit der Entfernung vom höchsten Gleichspannungspotential zunehmen.4. High-voltage insulation arrangement according to one of claims 1 to 3, characterized in that the distances between the solid barriers (12 to 17) increase with the distance from the highest DC potential. 5. Hochspannungsisolationsanordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die vom höchsten Gleichspannungspotential am weitesten entfern­te Feststoffbarriere (17) aus Werkstoff mit dem etwa 100-fachen spezifischen elektrischen Widerstand des Transformatoröls be­steht.5. High-voltage insulation arrangement according to one of claims 1 to 4, characterized in that the most distant from the highest DC voltage potential solid barrier (17) consists of material with about 100 times the electrical resistance of the transformer oil. 6. Hochspannungsisolationsanordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Feststoffbarrieren (13 bis 17) als konzentrische Zylindermäntel ausgeführt sind und bei einem Transformator die Verbindungs­stelle des Innenanschlusses einer Durchführung (1) mit der Hochspannungsausleitung (10) einer Wicklung umfassen.6. High-voltage insulation arrangement according to one of claims 1 to 5, characterized in that the solid barriers (13 to 17) are designed as concentric cylinder jackets and in a transformer, the connection point of the inner connection of a bushing (1) with the high-voltage lead (10) of a winding. 7. Hochspannungsisolationsanordnung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Feststoffbarrieren als im Querschnitt L-förmige Ringe ausge­führt sind und das hochspannungsseitige Ende einer Transforma­torwicklung umfassen.7. High-voltage insulation arrangement according to one of claims 1 to 6, characterized in that the solid barriers are designed as L-shaped rings in cross section and comprise the high-voltage end of a transformer winding.
EP88104507A 1987-04-09 1988-03-21 High voltage isolation device for transformers and inductances, especially destinated to high voltage direct current transmission Expired - Lifetime EP0285895B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88104507T ATE73572T1 (en) 1987-04-09 1988-03-21 HIGH VOLTAGE INSULATION ARRANGEMENT FOR TRANSFORMERS AND CHOKE COILS, PARTICULARLY FOR HIGH VOLTAGE DIRECT CURRENT (HGUE) TRANSMISSION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3712034 1987-04-09
DE3712034 1987-04-09

Publications (2)

Publication Number Publication Date
EP0285895A1 true EP0285895A1 (en) 1988-10-12
EP0285895B1 EP0285895B1 (en) 1992-03-11

Family

ID=6325247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104507A Expired - Lifetime EP0285895B1 (en) 1987-04-09 1988-03-21 High voltage isolation device for transformers and inductances, especially destinated to high voltage direct current transmission

Country Status (3)

Country Link
EP (1) EP0285895B1 (en)
AT (1) ATE73572T1 (en)
DE (1) DE3868959D1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0795877A2 (en) * 1996-03-14 1997-09-17 Hitachi, Ltd. DC bushing
WO2007096299A1 (en) * 2006-02-21 2007-08-30 Siemens Aktiengesellschaft Electrical shielding arrangement
WO2007111564A1 (en) * 2006-03-24 2007-10-04 Abb Technology Ltd A high voltage insulation system and a method of manufacturing same
WO2010060450A1 (en) * 2008-11-28 2010-06-03 Siemens Aktiengesellschaft Barrier arrangement for a cable duct
WO2011113479A1 (en) 2010-03-16 2011-09-22 Siemens Aktiengesellschaft Line guide system for a high-voltage transformer
RU2453941C2 (en) * 2007-08-20 2012-06-20 Тебиан Электрик Аппаратус Сток Ко., Лтд Reactor with steel core
WO2012093052A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Grading ring for an hvdc transformer winding or an hvdc reactor winding
DE102011008461A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Cutting point of a cable feedthrough for a HVDC component
DE102011008459A1 (en) 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Cable bushing for the boiler wall of an HVDC component
WO2012093053A1 (en) 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Insulating assembly for an hvdc component having wall-like solid barriers
DE102011008456A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Cable routing for HVDC transformer coils or HVDC choke coils
EP2942795A1 (en) * 2014-05-07 2015-11-11 ABB Technology Ltd High voltage electromagnetic induction device
EP3934036A1 (en) * 2020-06-30 2022-01-05 Siemens Aktiengesellschaft High voltage feedthrough and high voltage electrical device with high-voltage feedthrough

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2620958B1 (en) * 2012-01-26 2014-11-26 Siemens Aktiengesellschaft Shielding device for an electrically conductive connection element

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE592264C (en) * 1925-06-09 1934-02-03 Felten & Guilleaume Carlswerk Hard paper implementation in which the places of higher electrical stress consist of insulating material with a higher dielectric constant than the remaining insulating material
GB659222A (en) * 1949-05-17 1951-10-17 British Thomson Houston Co Ltd Improvements in high voltage electrical insulating bushings
DE891713C (en) * 1941-09-12 1953-10-01 Siemens Ag High-voltage transformer with star-connected high-voltage layer winding
DE1049971B (en) * 1959-02-05
DE1268720B (en) * 1964-09-21 1968-05-22 Licentia Gmbh Shield ring arrangement for windings of oil-filled transformers, instrument transformers and inductors
DE1293328B (en) * 1966-10-03 1969-04-24 Licentia Gmbh Layer winding with shields
DE1513958A1 (en) * 1965-09-24 1969-07-10 Licentia Gmbh Layer winding with capacitor control pads in the main spreading channel
DE1816492A1 (en) * 1968-12-23 1970-08-06 Licentia Gmbh Winding for transformers, inductors and similar devices with high DC voltage potential

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049971B (en) * 1959-02-05
DE592264C (en) * 1925-06-09 1934-02-03 Felten & Guilleaume Carlswerk Hard paper implementation in which the places of higher electrical stress consist of insulating material with a higher dielectric constant than the remaining insulating material
DE891713C (en) * 1941-09-12 1953-10-01 Siemens Ag High-voltage transformer with star-connected high-voltage layer winding
GB659222A (en) * 1949-05-17 1951-10-17 British Thomson Houston Co Ltd Improvements in high voltage electrical insulating bushings
DE1268720B (en) * 1964-09-21 1968-05-22 Licentia Gmbh Shield ring arrangement for windings of oil-filled transformers, instrument transformers and inductors
DE1513958A1 (en) * 1965-09-24 1969-07-10 Licentia Gmbh Layer winding with capacitor control pads in the main spreading channel
DE1293328B (en) * 1966-10-03 1969-04-24 Licentia Gmbh Layer winding with shields
DE1816492A1 (en) * 1968-12-23 1970-08-06 Licentia Gmbh Winding for transformers, inductors and similar devices with high DC voltage potential

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 84 (E-239)[1521], 18. April 1984; & JP-A-59 006 505 (TOKYO SHIBAURA DENKI K.K.) 13-01-1984 *
WISSENSCHAFTLICHE BERICHTE AEG-TELEFUNKEN, Band 43, Nr. 3?4, 17 März 1971, Seiten 192-200; H. FALKENHAGEN et al.: "Isolationsfragen bei Stromrichter-Transformatoren für die Hochspannungs-Gleichstromübertragung" *

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0795877A2 (en) * 1996-03-14 1997-09-17 Hitachi, Ltd. DC bushing
EP0795877A3 (en) * 1996-03-14 1998-09-16 Hitachi, Ltd. DC bushing
WO2007096299A1 (en) * 2006-02-21 2007-08-30 Siemens Aktiengesellschaft Electrical shielding arrangement
US7927141B2 (en) 2006-02-21 2011-04-19 Siemens Aktiengesellschaft Electrical shielding arrangement
WO2007111564A1 (en) * 2006-03-24 2007-10-04 Abb Technology Ltd A high voltage insulation system and a method of manufacturing same
US7994427B2 (en) 2006-03-24 2011-08-09 Abb Technology Ltd. High voltage insulation system and a method of manufacturing same
CN101213624B (en) * 2006-03-24 2011-10-26 Abb技术有限公司 A high voltage insulation system and a method of manufacturing same
RU2453941C2 (en) * 2007-08-20 2012-06-20 Тебиан Электрик Аппаратус Сток Ко., Лтд Reactor with steel core
WO2010060450A1 (en) * 2008-11-28 2010-06-03 Siemens Aktiengesellschaft Barrier arrangement for a cable duct
WO2011113479A1 (en) 2010-03-16 2011-09-22 Siemens Aktiengesellschaft Line guide system for a high-voltage transformer
WO2012093023A2 (en) 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Line feedthrough for the vessel wall of an hvdc component
WO2012093023A3 (en) * 2011-01-07 2012-08-30 Siemens Aktiengesellschaft Line feedthrough for the vessel wall of an hvdc component
DE102011008459A1 (en) 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Cable bushing for the boiler wall of an HVDC component
WO2012093054A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Disconnection point of a wire feedthrough for an hvdc component
WO2012093052A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Grading ring for an hvdc transformer winding or an hvdc reactor winding
WO2012093053A1 (en) 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Insulating assembly for an hvdc component having wall-like solid barriers
DE102011008456A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Cable routing for HVDC transformer coils or HVDC choke coils
WO2012093055A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Wiring arrangement for hvdc transformer windings or hvdc reactor windings
DE102011008454A1 (en) 2011-01-07 2012-07-26 Siemens Aktiengesellschaft Isolation arrangement for a HVDC component with wall-like solid barriers
DE102011008461A1 (en) * 2011-01-07 2012-07-12 Siemens Aktiengesellschaft Cutting point of a cable feedthrough for a HVDC component
CN103403818A (en) * 2011-01-07 2013-11-20 西门子公司 Wiring arrangement for HVDC transformer windings or HVDC reactor windings
CN103415971A (en) * 2011-01-07 2013-11-27 西门子公司 Disconnection point of a wire feedthrough for an hvdc component
CN103415894A (en) * 2011-01-07 2013-11-27 西门子公司 Insulating assembly for an HVDC component having wall-like solid barriers
CN103415971B (en) * 2011-01-07 2017-05-24 西门子公司 Disconnection point of a wire feedthrough for an hvdc component
CN103415894B (en) * 2011-01-07 2016-11-02 西门子公司 The seal for D.C. high voltage transmission assembly with wall-like solid insulation
CN103403818B (en) * 2011-01-07 2017-01-18 西门子公司 Wiring arrangement for HVDC transformer windings or HVDC reactor windings
EP2942795A1 (en) * 2014-05-07 2015-11-11 ABB Technology Ltd High voltage electromagnetic induction device
US9672969B2 (en) 2014-05-07 2017-06-06 Abb Schweiz Ag High voltage electromagnetic induction device
EP3934036A1 (en) * 2020-06-30 2022-01-05 Siemens Aktiengesellschaft High voltage feedthrough and high voltage electrical device with high-voltage feedthrough

Also Published As

Publication number Publication date
EP0285895B1 (en) 1992-03-11
ATE73572T1 (en) 1992-03-15
DE3868959D1 (en) 1992-04-16

Similar Documents

Publication Publication Date Title
DE69728972T2 (en) TRANSFORMER / REACTOR
EP0285895B1 (en) High voltage isolation device for transformers and inductances, especially destinated to high voltage direct current transmission
DE3243595C2 (en) Winding arrangement for a gas-cooled transformer
DE69816101T2 (en) POWER TRANSFORMER / inductance
WO2009149857A1 (en) Test arrangement for ac testing of electrical high voltage components
DE3634946C2 (en) Arrangement for the transmission of a high-voltage direct current
EP0315835A1 (en) High-voltage potential tranformer
EP1529296B1 (en) Winding arrangement
EP0383988B1 (en) High-voltage lead-through for oil-cooled electric devices
DE2530892C3 (en) Particle accelerator for charged particles
EP2846336A1 (en) Connection of at least four electrical conductors
DE2513218C2 (en) Arrangement for preventing glow discharges on the electrodes of electrical high-voltage devices
DE19926540C1 (en) Capacitatively controlled high voltage winding
DE478394C (en) Antenna system
DE501099C (en) Transmission system or a combination of transmission systems with transmitters for telecommunications flows
DE102019213995B4 (en) Measuring arrangement for measuring a voltage potential on a conductor in a power switching device and corresponding power switching device
DE627614C (en) Voltage transformer for high voltages
DE1283967B (en) Shielded high voltage rectifier
EP3001433B1 (en) Pin-isolator adapted for a transformer
WO2009138099A1 (en) Coupling of transformer winding modules
DE3326422C2 (en)
EP3363055A1 (en) High-energy surge current limiter
EP0660343B1 (en) High-voltage transformer and use
DE1174421B (en) Winding arrangement for high voltage power transformers
DE2934719A1 (en) Encapsulated transformer with HV and LV winding - has insulators between HV winding and metal supporting elements, containing potential control capacitors (NL 4.3.80)

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE GB IT LI NL SE

17P Request for examination filed

Effective date: 19881026

17Q First examination report despatched

Effective date: 19910726

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE GB IT LI NL SE

REF Corresponds to:

Ref document number: 73572

Country of ref document: AT

Date of ref document: 19920315

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3868959

Country of ref document: DE

Date of ref document: 19920416

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
EAL Se: european patent in force in sweden

Ref document number: 88104507.4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960220

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19960223

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19960320

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19960328

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960520

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19960624

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19970321

Ref country code: AT

Effective date: 19970321

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19970322

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19970331

Ref country code: CH

Effective date: 19970331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19971001

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970321

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19971001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19971202

EUG Se: european patent has lapsed

Ref document number: 88104507.4

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050321