EP0051715A2 - Protective device for high-voltage condenser bushings - Google Patents

Protective device for high-voltage condenser bushings Download PDF

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Publication number
EP0051715A2
EP0051715A2 EP81105290A EP81105290A EP0051715A2 EP 0051715 A2 EP0051715 A2 EP 0051715A2 EP 81105290 A EP81105290 A EP 81105290A EP 81105290 A EP81105290 A EP 81105290A EP 0051715 A2 EP0051715 A2 EP 0051715A2
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EP
European Patent Office
Prior art keywords
mounting flange
paper
ring
protective device
voltage condenser
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
EP81105290A
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German (de)
French (fr)
Other versions
EP0051715B1 (en
EP0051715A3 (en
Inventor
Wolfgang Zürich
Gerhard Brödner
Joachim Voss
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.)
Transformatorenwerk Karl Liebknecht VEB
Original Assignee
Transformatorenwerk Karl Liebknecht VEB
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.)
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Application filed by Transformatorenwerk Karl Liebknecht VEB filed Critical Transformatorenwerk Karl Liebknecht VEB
Publication of EP0051715A2 publication Critical patent/EP0051715A2/en
Publication of EP0051715A3 publication Critical patent/EP0051715A3/en
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Publication of EP0051715B1 publication Critical patent/EP0051715B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/28—Capacitor type

Definitions

  • the invention relates to a fuse device for high-voltage capacitor bushings in soft paper design, which are installed in transformers filled with insulating liquid, choke coils or similar electrical devices
  • the active part is generally housed in closed housings filled with a liquid insulating medium.
  • suitable insulating arrangements are attached around the conductor in order to prevent an electrical flashover or breakdown at the passage point through the preferably metallic housing wall.
  • bushings are usually used which are manufactured as a complete assembly and which, at higher voltages, have a capacitor winding arranged concentrically with the conductor, the coverings of which reduce the conductor potential to the earth potential of the housing in a controlled manner.
  • the capacitors are designed as soft paper windings with inserted coatings made of metal foil or of semiconducting paper.
  • the capacitor winding the central inner conductor is embedded in a hermetically sealed housing, which is usually filled with an insulating liquid.
  • This housing consists of a metallic center piece, which is also designed as a flange for attachment to the opening through the device housing.
  • the ribbed outdoor isolator is located outside the transformer.
  • the lower part of the bushing protruding into the interior of the transformer also consists of a porcelain cap, but because of the surrounding insulating medium, there is no need for outer ribs to extend the creepage distance.
  • the mechanical integrity of such feedthroughs is effected in a known manner by a central pin, or a central tube, are pressed on the b zw. Porcelain throws with high force against the metallic center flange.
  • a spring element which is mostly interposed at the head end, ensures a uniform pressing pressure, which remains effective even with small thermally induced changes in length.
  • the central tensioning element also serves as a current conductor, and if a tube is used for this, a cable conductor can also be guided inside.
  • the central tensioning element is surrounded by a soft paper capacitor winding which is itself surrounded by a liquid insulating medium, preferably insulating oil, in such a way that the winding "floats" in the insulating oil.
  • the function-related spring element accelerates the breakdown. It is particularly disadvantageous and dangerous in the event of a collapse of the bushing that the central capacitor winding slides into the interior of the transformer due to the action of gravity and causes large electrical and mechanical damage which can lead to the destruction of the transformer or
  • Consequential damage in the systems e.g. Can cause fires.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, solves the problem of creating a safety device for high-voltage capacitor bushings, which prevents the capacitor winding from falling through into the interior of the transformer if the union porcelain breaks.
  • a conical ring narrowing downward in the inner diameter is arranged on the inner circumference of the fastening flange and, as a counterpart to this, a ring of insulating paper widening upward in diameter is wound on the capacitor winding at the height of the fastening flange.
  • Both rings are dimensioned in such a way that if the outdoor insulator breaks, the capacitor winding jams after only a short downward movement and thus cannot get into the interior of the transformer.
  • the expected formation of wrinkles in the interior of the roll in the case of paper and the conductive coverings can be accepted because the implementation now only has to remain operational for a limited time.
  • wedge-shaped holding pieces can also be distributed uniformly.
  • the drawing shows a simplified sectional view of a high-voltage bushing, which consists of an outdoor insulator 1, a mounting flange 2 and the porcelain lower part 3.
  • the capacitor winding 4 made of soft paper is wound onto a tensioning bolt 5, which in this example is also a current conductor Nut 7 for bracing the entire assembly.
  • a paper wedge ring 9 is additionally wound up, which in the undamaged state of the bushing lies only loosely or not at all on the conical pressure ring 8.
  • the capacitor winding designed according to the invention slips. 4 down into the conical ring 8 and clamps firmly.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)

Abstract

1. A protective device for a high-voltage condenser bushing comprising a soft-paper capacitor element, characterised in that a conical ring (8) with a downwardly tapering inner diameter is disposed about the inner circumference of the mounting flange (2), and that a ring (9) of insulating paper with an upwardly flaring outer diameter is wound as counter-part on the capacitor element (4) at the level of the mounting flange (2) such that normally the two rings are disengaged while in case of malfunction they prevent falling-through of the soft-paper capacitor element.

Description

Die Erfindung bezieht sich auf eine Sicherungseinrichtung für Hochspannungs-Kondensator-Durchführungen in Weichpapierausführung, die in mit Isolierflüssigkeit gefüllte Transformatoren, Drosselspulen oder ähnliche elektrische Geräte eingebaut sindThe invention relates to a fuse device for high-voltage capacitor bushings in soft paper design, which are installed in transformers filled with insulating liquid, choke coils or similar electrical devices

Bei Transformatoren, Drosselspulen und ähnlichen elektrischen Geräten ist der Aktivteil im allgemeinen in geschlossenen, mit einem flüssigen Isoliermedium gefüllten Gehäusen untergebracht. Zur Herausführung der Zeiteranschlüsse aus dem Gehäuse sind um den Leiter herum geeignete Isolieranordnungen angebracht, um einen elektrischen Überschlag oder Durchschlag an der Durchgangsstelle durch die vorzugsweise metallische Gehäusewandung zu verhindern. Als geeignete Isolieranordnungen werden üblicherweise Durchführungen verwendet, die als komplette Baugruppe hergestellt werden und bei höheren Spannungen als Leiterisolation einen zum Leiter konzentrisch angeordneten Kondensatorwickel aufweisen, durch dessen Beläge das Leiterpotential gesteuert auf das Erdpotential des Gehäuses abgebaut wird. Bei einer modernen, hochspannungstechnisch besonders gü.nstigen Bauart derartiger Durchführungen sind die Kondensatoren als Weichpapierwickel mit eingefügten Belägen aus Metallfolie oder aus halbleitendem Papier ausgeführt. Der Kondensatorwickel mit dem zentralen Innenleiter ist in ein hermetisch verschlossenes Gehäuse eingebettet, das meistens mit einer Isolierflüssigkeit gefüllt ist. Dieses Gehäuse besteht aus einem metallischen Mittelstück, das zugleich als Flansch für die Befestigung am Durchbruch durch das Gerätegehäuse ausgebildet ist. Außerhalb des Transformators befindet sich der mit Rippen versehene Freiluftisolator. Das in das Innere des Transformators hineinragende Unterteil der Durchführung besteht ebenfalls aus einem Porzellanüberwurf, bei dem jedoch wegen des umgebenden Isoliermediums auf kriechwegverlängernde Außenrippen verzichtet werden kann. Der mechanische Zusammenhalt derartiger Durchführungen wird in bekannter Weise durch einen zentralen Bolzen oder ein zentrales Rohr bewirkt, über den bzw. das Porzellanüberwürfe mit hoher Kraft gegen den metallischen Mittelflansch gepreßt werden. Ein meist am Kopfende zwischengeschaltetes Federelement sorgt für einen gleichmäßigen Preßdruck, der auch bei geringen thermisch bedingten Längenänderungen wirksam bleibt. Das zentrale Spannelement dient zugleich als Stromleiter, und sofern ein Rohr dafür verwendet wird, kann in dessen Inneren auch ein Seilleiter geführt werden. Das zentrale Spannelement ist von einem Weichpapier-Kondensatorwickel umgeben, der selbst von einem flüssigen Isoliermedium, vorzugsweise Isolieröl, umgeben ist, derart, daß der Wickel im Isolieröl "schwimmt".In the case of transformers, choke coils and similar electrical devices, the active part is generally housed in closed housings filled with a liquid insulating medium. To lead the time connections out of the housing, suitable insulating arrangements are attached around the conductor in order to prevent an electrical flashover or breakdown at the passage point through the preferably metallic housing wall. As suitable insulation arrangements, bushings are usually used which are manufactured as a complete assembly and which, at higher voltages, have a capacitor winding arranged concentrically with the conductor, the coverings of which reduce the conductor potential to the earth potential of the housing in a controlled manner. In the case of a modern type of bushings of this type, which is particularly advantageous in terms of high voltage technology, the capacitors are designed as soft paper windings with inserted coatings made of metal foil or of semiconducting paper. The capacitor winding the central inner conductor is embedded in a hermetically sealed housing, which is usually filled with an insulating liquid. This housing consists of a metallic center piece, which is also designed as a flange for attachment to the opening through the device housing. The ribbed outdoor isolator is located outside the transformer. The lower part of the bushing protruding into the interior of the transformer also consists of a porcelain cap, but because of the surrounding insulating medium, there is no need for outer ribs to extend the creepage distance. The mechanical integrity of such feedthroughs is effected in a known manner by a central pin, or a central tube, are pressed on the b zw. Porcelain throws with high force against the metallic center flange. A spring element, which is mostly interposed at the head end, ensures a uniform pressing pressure, which remains effective even with small thermally induced changes in length. The central tensioning element also serves as a current conductor, and if a tube is used for this, a cable conductor can also be guided inside. The central tensioning element is surrounded by a soft paper capacitor winding which is itself surrounded by a liquid insulating medium, preferably insulating oil, in such a way that the winding "floats" in the insulating oil.

Der erhebliche Nachteil dieser Durchführung besteht darin, daß beim Bruch des luftseitigen Porzellanüberwulfes die ganze Durchführung praktisch sofort zusammenbricht.The significant disadvantage of this implementation is that if the air-side porcelain overwrap breaks, the entire implementation breaks down practically immediately.

Das funktionsbedingte Federelement beschleunigt dabei den Zusammenbruch. Besonders nachteilig und gefährlich ist bei einem Zusammenbruch der Durchführung, daß der zentrale Kondensatorwickel durch Einwirkung der Schwerkraft in das Innere des Transformators rutscht und elektrische und mechanische Schäden großen Ausmaßes verursacht, die bis zur Zerstörung des Transformators führen können bzw.The function-related spring element accelerates the breakdown. It is particularly disadvantageous and dangerous in the event of a collapse of the bushing that the central capacitor winding slides into the interior of the transformer due to the action of gravity and causes large electrical and mechanical damage which can lead to the destruction of the transformer or

Folgeschäden in den Anlagen, z.B. Brände, hervorrufen können.Consequential damage in the systems, e.g. Can cause fires.

Es sind Lösungen bekannt, die ein Durchfallen des zentralen Kondensatorwickels bei Porzellanbruch verhindern sollen, indem durch eine straffe Bandage um den Wickel im Bereich des Erdpotentials eine Aufhängomöglichkeit geschaffen wird, die in geeigneter Weise im Inneren des Metallflansches aufliegto Da der Kondensatorwickel dadurch bei Zerstörung des Porzellanüberwurfes in seiner vorgeschriebenen Lage festgehalten wird und auch die' Schlagweite der luftseitig freiliegenden spannungsführenden Teile erhalten bleibt und somit die Betriebsfähigkeit der Durchführung bis zum baldigen Abschalten des Transformators gewährleistet ist, treten zwar die bereits genannten Nachteile mit den schwerwiegenden Folgen nicht auf, jedoch ist hierbei der Nachteil zu verzeichnen, daß beim Anlegen der Bandage der Kondensatorwickel derart zusammengepreßt wird, daß in den einzelnen Papierlagen, vor allem in den leitenden Belägen, Falten entstehen, die die innere elektrische Festigkeit des Kondensatorwickels vermindern. Dies führt zu Inhomogenitäten in der elektrischen Feldverteilung zwischen den Belägen, was insbesondere bei Langzeitbetrieb eine Verkürzung der Lebensdauer zur Folge hat.Solutions are known which are intended to prevent the central capacitor winding from falling through in the event of porcelain breakage, by creating a suspension option by means of a tight bandage around the winding in the region of the earth potential, which hangs in a suitable manner on the inside of the metal flange is maintained in its prescribed position and the ' striking distance of the live parts exposed on the air side is preserved and thus the operability of the implementation is guaranteed until the transformer is switched off soon, the disadvantages already mentioned with the serious consequences do not occur, but this is the case Disadvantage to be noted that when the bandage is applied, the capacitor winding is compressed in such a way that folds occur in the individual paper layers, especially in the conductive coverings, which ver verify the internal electrical strength of the capacitor winding reduce. This leads to inhomogeneities in the electrical field distribution between the pads, which results in a shortening of the service life, especially in long-term operation.

Hier will die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, löst die Aufgabe, eine Sicherungseinrichtung für Hochspannungs-Kondensator-Durchführungen zu schaffen, die bei Bruch des Überwurfporzellans ein Durchfallen des Kondensatorwickels in das Innere des Transformators verhindert.The invention seeks to remedy this. The invention, as characterized in the claims, solves the problem of creating a safety device for high-voltage capacitor bushings, which prevents the capacitor winding from falling through into the interior of the transformer if the union porcelain breaks.

Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, daß die schwerwiegenden Folgen für den Transformator, die Drosselspule oder ähnliche Geräte bei einem Durchführungsdefekt vermieden und auch die nachgeschalteten Anlagenelemente nicht in Mitleidenschaft gezogen werden. Gleichzeitig erfahren die Funktionssicherheit und Lebensdauer der Durchführung keine nachteilige Beeinflussung.The advantages achieved by the invention are essentially to be seen in the fact that the serious consequences for the transformer, the inductor or similar devices are avoided in the event of an implementation defect and also the downstream system elements are not affected. At the same time, the functional reliability and service life of the implementation are not adversely affected.

Das wird erfindungsgemäß dadurch erreicht, indem am inneren Umfang des Befestigungsflansches ein sich nach unten im inneren Durchmesser verengender konischer Ring angeordnet und als Gegenstück dazu auf dem Kondensatorwickel in Höhe des Befestigungsflansches ein sich nach oben im Durchmesser erweiternder Ring aus Isolierpapier aufgewickelt ist. Beide Ringe sind so dimensioniert, daß sich der Kondensatorwickel bei Bruch des Freiluftisolators nach nur kurzer Abwärtsbewegung festklemmt und so nicht in das Innere des Transformators gelangen kann. Dabei entsteht ein radialer Druck auf den Umfang des Wickels, der dadurch zusammengepreßt und verfestigt wird, derart, daß auch ein Durchrutschen einzelner Lagen verhindert wird. Die dabei zu erwartende nachteilige Faltenbildung im Inneren des Wickels beim Papier und den leitenden Belägen kann in Kauf genommen werden, weil die Durchführung jetzt nur noch für eine begrenzte Zeit betriebsfähig bleiben muß.This is achieved according to the invention in that a conical ring narrowing downward in the inner diameter is arranged on the inner circumference of the fastening flange and, as a counterpart to this, a ring of insulating paper widening upward in diameter is wound on the capacitor winding at the height of the fastening flange. Both rings are dimensioned in such a way that if the outdoor insulator breaks, the capacitor winding jams after only a short downward movement and thus cannot get into the interior of the transformer. This creates a radial pressure on the circumference of the roll, which is thereby compressed and solidified in such a way that slipping of individual layers is also prevented. The expected formation of wrinkles in the interior of the roll in the case of paper and the conductive coverings can be accepted because the implementation now only has to remain operational for a limited time.

Im Normalbetrieb der unbeschädigten Durchführung tritt diese, die Lebensdauer der Durchführung beeinträchtigende Erscheinung nicht auf.In normal operation of the undamaged bushing, this phenomenon that affects the life of the bushing does not occur.

Anstelle des konischen Ringes am Innenumfang des Befestigungsflansches können auch gleichmäßig verteilt keilförmige Haltestücke angebracht werden.Instead of the conical ring on the inner circumference of the fastening flange, wedge-shaped holding pieces can also be distributed uniformly.

Im folgenden wird die Erfindung anhand einer Zeichnung, die einen Ausführungsweg darstellt, näher erläutert.The invention is explained in more detail below with reference to a drawing which represents an embodiment.

Die Zeichnung zeigt eine vereinfachte Schnittdarstellung einer Hochspannungsdurchführung, die aus einem Freiluftisolator 1, einem Befestigungsflansch 2 und dem Porzellanunterteil 3 besteht. Der Kondensatorwickel 4 aus Weichpapier ist auf einen Spannbolzen 5, der in diesem Beispiel zugleich Stromleiter ist, aufgewickelte Am oberen Ende des Spannbolzens sind eine Druckfeder 6 angeordnet sowie eine Mutter 7 zum Verspannen der gesamten Anordnung.The drawing shows a simplified sectional view of a high-voltage bushing, which consists of an outdoor insulator 1, a mounting flange 2 and the porcelain lower part 3. The capacitor winding 4 made of soft paper is wound onto a tensioning bolt 5, which in this example is also a current conductor Nut 7 for bracing the entire assembly.

Im Mittelteil des Kondensatorwickels, in Höhe des Befestigungsflansches 2, ist zusätzlich ein Papierkeilring 9 aufgewickelt, der im unbeschädigten Zustand der Durchführung nur lose oder überhaupt nicht am konischen Druckring 8 anliegt. Bei Havarie der Durchfiihrunq, d.h., wenn die Haltefunktion des Freiluftisolators wegfällt, rutscht der erfindungsgemäß ausqeführte Kondensatorwickel. 4 nach unten in den konischen Ring 8 hinein und klemmt sich fest.In the middle part of the capacitor winding, at the level of the fastening flange 2, a paper wedge ring 9 is additionally wound up, which in the undamaged state of the bushing lies only loosely or not at all on the conical pressure ring 8. In the event of an accident, i.e. when the holding function of the outdoor insulator ceases to exist, the capacitor winding designed according to the invention slips. 4 down into the conical ring 8 and clamps firmly.

Claims (2)

1. Sicherungseinrichtung für Hochspannungs-Kondensator-Durchführung mit Weichpapierwickel
dadurch gekennzeichnet,
daß am inneren Umfang des Befestigungsflansches (2) ein sich im Innendurchmesser nach unten verengender konischer Ring (8) angeordnet ist und daß als GeGenstück dazu auf dem Kondensatorwickel (4) in Höhe des Befestigungsflansches (2) ein sich nach oben im Außendurchmesser erweiternder Ring (9) aus Isolierpapier aufgewickelt ist.1. Safety device for high-voltage condenser bushing with soft paper winding
characterized,
that on the inner circumference of the mounting flange (2) there is a conical ring (8) which narrows down in the inside diameter and that as a counterpart to this on the capacitor winding (4) at the level of the mounting flange (2) is a ring which widens upwards in the outside diameter ( 9) is wound from insulating paper. dadurch gekennzeichnet, daß 2. Sicherungseinrichtung nach Patentanspruch 1, am inneren Umfang des Befestigungsflansches (2) gleichmäßig verteilt anstelle des konischen Ringes (8) einzelne keilförmige Haltestücke angeordnet sind.characterized in that 2. securing device according to claim 1, on the inner circumference of the mounting flange (2) evenly distributed instead of the conical ring (8) individual wedge-shaped holding pieces are arranged.
EP19810105290 1980-11-04 1981-07-08 Protective device for high-voltage condenser bushings Expired EP0051715B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD224950 1980-11-04
DD22495080A DD161044A3 (en) 1980-11-04 1980-11-04 FUSE DEVICE FOR HIGH VOLTAGE CONDENSER IMPLEMENTATION

Publications (3)

Publication Number Publication Date
EP0051715A2 true EP0051715A2 (en) 1982-05-19
EP0051715A3 EP0051715A3 (en) 1982-11-17
EP0051715B1 EP0051715B1 (en) 1986-06-11

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ID=5527043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810105290 Expired EP0051715B1 (en) 1980-11-04 1981-07-08 Protective device for high-voltage condenser bushings

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EP (1) EP0051715B1 (en)
DD (1) DD161044A3 (en)
DE (1) DE3174805D1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011086033A1 (en) * 2010-01-15 2011-07-21 Siemens Aktiengesellschaft High-voltage duct
CN102568757A (en) * 2010-09-21 2012-07-11 Abb技术有限公司 Plug-in bushing and high-voltage installation having a bushing such as this
CN112673436A (en) * 2018-08-30 2021-04-16 Abb电网瑞士股份公司 Electrical bushing with anti-rotation mounting flange and method of mounting an electrical bushing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE310463C (en) *
US2859269A (en) * 1955-01-25 1958-11-04 Gen Electric High voltage bushing
BE654060A (en) * 1964-10-07 1965-04-07 Acec Cast synthetic resin insulator, hardened

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE310463C (en) *
US2859269A (en) * 1955-01-25 1958-11-04 Gen Electric High voltage bushing
BE654060A (en) * 1964-10-07 1965-04-07 Acec Cast synthetic resin insulator, hardened

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011086033A1 (en) * 2010-01-15 2011-07-21 Siemens Aktiengesellschaft High-voltage duct
CN102714077A (en) * 2010-01-15 2012-10-03 西门子公司 High-voltage duct
CN102568757A (en) * 2010-09-21 2012-07-11 Abb技术有限公司 Plug-in bushing and high-voltage installation having a bushing such as this
CN102568757B (en) * 2010-09-21 2014-11-26 Abb技术有限公司 Plug-in bushing and high-voltage installation having a bushing such as this
CN112673436A (en) * 2018-08-30 2021-04-16 Abb电网瑞士股份公司 Electrical bushing with anti-rotation mounting flange and method of mounting an electrical bushing
US11798712B2 (en) 2018-08-30 2023-10-24 Hitachi Energy Switzerland Ag Electrical bushing having an anti-rotation mounting flange and method for mounting the same

Also Published As

Publication number Publication date
EP0051715B1 (en) 1986-06-11
DE3174805D1 (en) 1986-07-17
DD161044A3 (en) 1984-08-29
EP0051715A3 (en) 1982-11-17

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