EP0051715B1 - Protective device for high-voltage condenser bushings - Google Patents
Protective device for high-voltage condenser bushings Download PDFInfo
- Publication number
- EP0051715B1 EP0051715B1 EP19810105290 EP81105290A EP0051715B1 EP 0051715 B1 EP0051715 B1 EP 0051715B1 EP 19810105290 EP19810105290 EP 19810105290 EP 81105290 A EP81105290 A EP 81105290A EP 0051715 B1 EP0051715 B1 EP 0051715B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protective device
- paper
- mounting flange
- capacitor element
- 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.)
- Expired
Links
- 230000001681 protective effect Effects 0.000 title claims 3
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000007257 malfunction Effects 0.000 claims 1
- 238000004804 winding Methods 0.000 description 13
- 239000004020 conductor Substances 0.000 description 9
- 239000012212 insulator Substances 0.000 description 9
- 229910052573 porcelain Inorganic materials 0.000 description 9
- 239000007788 liquid Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 3
- 238000000576 coating method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- 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 provided 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, at higher voltages as conductor insulation, have a capacitor winding arranged concentrically with the conductor, through the coatings of which the conductor potential is reduced 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 with 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 cohesion of such bushings is effected in a known manner by means of a central bolt or a central tube, by means of which porcelain sleeves are pressed against the metallic central flange with high force.
- a spring element which is usually interposed at the head end, ensures a uniform pressing pressure, which remains effective even with slight thermal 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.
- BE-A-654 060 Another high-voltage bushing is known from BE-A-654 060, in which an outer and an inner insulator made of hardened cast resin are arranged around a metallic central tube. An insulating cone is inserted between these insulators and the central tube, which creates annular channels for the passage of a weakly electrically conductive liquid.
- the inner insulator has shoulders on its inside that serve as supports for the lower end of the sleeve or the insulating cone.
- Such an implementation provides a certain hold for the current-carrying parts on the sleeve supported on the shoulder of the inner insulator in the event of a break of the outer insulator alone, but this is also ultimately a component exposed to the risk of breakage by external forces, so that in As a result, no satisfactory security is guaranteed against conductive parts falling into the interior of the transformer if the outer insulator parts break.
- the conical ring narrowing downwards in the inner diameter on the inner circumference of the fastening flange and the ring made of insulating paper, which increases in diameter as a counterpart to this on the capacitor winding at the height of the fastening flange, are dimensioned such that the capacitor winding is only broken if the outdoor insulator breaks short downward movement so that it cannot get inside the transformer. This creates a radial pressure on the circumference of the roll, which is pressed and solidified in such a way that individual layers are prevented from slipping.
- the expected formation of wrinkles inside the winding of the paper and the conductive coverings can be accepted because the implementation should now only remain operational for a limited time until measures to switch off the high-voltage device filled with insulating liquid, e.g. of the transformer.
- wedge-shaped holding pieces can also be fitted in an evenly distributed manner.
- 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 on a clamping bolt 5, which in this example is also a current conductor.
- a pressure spring 6 is arranged and a nut 7 for bracing the entire arrangement.
- 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 4 slides down into the conical ring 8 and clamps itself in place.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulators (AREA)
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 sind.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.
Bei Transformatoren, Drosselspulen und ähnlichen elektrischen Geräten ist der Aktivteil im allgemeinen in geschlossenen, mit einem flüssigen Isoliermedium gefüllten Gehäusen untergebracht. Zur Herausführung der Leiteranschlüsse 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 üblicherwsise 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 günstigen Bauart derartiger Durchführungen sind die Kondensatoren als Weichpapierwickel mit eingefügten Belägen aus Metallfolie oder aus halbleitendem Papier ausgeführt.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. In order to lead the conductor connections out of the housing, suitable insulating arrangements are provided 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, at higher voltages as conductor insulation, have a capacitor winding arranged concentrically with the conductor, through the coatings of which the conductor potential is reduced to the earth potential of the housing in a controlled manner. In a modern type of bushings of this type, which is particularly favorable 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.
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 lsoliermedium, vorzugsweise lsolieröl, umgeben ist, derart, daß der Wickel im Isolieröl "schwimmt".The capacitor winding with 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 cohesion of such bushings is effected in a known manner by means of a central bolt or a central tube, by means of which porcelain sleeves are pressed against the metallic central flange with high force. A spring element, which is usually interposed at the head end, ensures a uniform pressing pressure, which remains effective even with slight thermal 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.
Bei einer aus der US-A- 2 859 269 bekannten Hochspannungs-Kondensator-Durchführung, die je nach der Ausbildung der Anschlußelemente bei Transformatoren oder bei Leistungsschattern eingesetzt werden kann, folgen rund um den Kondensatorwickel und ein von diesem umschlossenes Zentralrohr der Reihe nach ein äußerer Porzellanüberwurf, ein metallischer Mittelflansch und ein innerer Porzellanüberwurf aufeinander, die mit Hilfe von endseitig am inneren und am äußeren porzellanüberwurf angreifenden Spannplatten zusammengehalten werden. Bei einer solchen Ausbildung der Durchführung besteht bei einem Bruch des luftseitigen äußeren Porzellanüberwurfs die Gefahr, daß der Kondensatorwickel der Schwerkraft folgend in das Innere des Transformators rutscht und dort mechanische und elektrische Schäden bis zur Zerstörung des Transformators und möglichen Folgeschäden für die Gesamtanlage z.B. durch Brand auslöst, sofern nicht durch eine bei Transformatoren für deren Betrieb nicht notwendige und daher unübliche zusätzliche mechanisch stabile Verbindung zwischen dem Mittelflansch und dem inneren Porzellanüberwurf dafür gesorgt wird, daß der innere Porzellanüberwurf anderweitig Halt findet.In a high-voltage capacitor bushing known from US-A-2 859 269, which can be used in transformers or circuit breakers, depending on the design of the connection elements, an outer tube follows one after the other around the capacitor winding and a central tube enclosed by the latter Porcelain cap, a metallic middle flange and an inner porcelain cap, which are held together with the help of clamping plates that act on the end of the inner and outer porcelain cap. With such a design of the implementation, if the outer porcelain cap on the air side breaks, there is a risk that the capacitor winding will slide into the interior of the transformer following the force of gravity and there mechanical and electrical damage until the transformer is destroyed and possible consequential damage to the entire system, e.g. triggers by fire, unless an additional mechanically stable connection between the center flange and the inner porcelain cover, which is not necessary for transformers for their operation and is therefore unusual, ensures that the inner porcelain cover finds a different hold.
Aus BE-A-654 060 ist eine weitere Hochspannungsdurchführung bekannt, bei der rund um ein metallisches Zentralrohr ein äußerer und ein innerer Isolator aus gehärtetem Gießharz angeordnet sind. Zwischen diesen Isolatoren und dem Zentralrohr ist ein IsolierKonus eingefügt, der ringförmige Kanäle für den Durchtritt einer schwach elektrisch leitenden Flüssigkeit entstehen läßt. Der innere Isolator weist auf seiner Innenseite Schultern auf, die als Stützen für das untere Ende der Hülse bzw. des Isolierkonus dienen. Eine solche Durchführungsausbildung bietet zwar bei einem Bruch allein des äußeren Isolators einen gewissen Halt für die stromführenden Teile an der auf der Schulter des inneren Isolators abgestützten Hülse, doch handelt es sich auch bei diesem letztlich um ein durch äußere Kräfte Bruchgefahr ausgesetztes Bauteil, so daß im Ergebnis keine zufriedenstellende Sicherheit gegen ein Abstürzen leitender Teile in das Transformatorinnere bei einem Bruch der äußeren Isolatorteile gewährleistet ist.Another high-voltage bushing is known from BE-A-654 060, in which an outer and an inner insulator made of hardened cast resin are arranged around a metallic central tube. An insulating cone is inserted between these insulators and the central tube, which creates annular channels for the passage of a weakly electrically conductive liquid. The inner insulator has shoulders on its inside that serve as supports for the lower end of the sleeve or the insulating cone. Such an implementation provides a certain hold for the current-carrying parts on the sleeve supported on the shoulder of the inner insulator in the event of a break of the outer insulator alone, but this is also ultimately a component exposed to the risk of breakage by external forces, so that in As a result, no satisfactory security is guaranteed against conductive parts falling into the interior of the transformer if the outer insulator parts break.
Daher ist es Aufgabe der vorliegenden Erfindung, eine Sicherungseinrichtung für Hochspannungs-Kondensator-Durchführungen zu schaffen, die bei jedem denkbaren Bruch an der äußeren Isolierung die Gefahr eines Abstürzens leitender Teile in das Transformatorinnere mit Sicherheit ausschließt.It is therefore an object of the present invention to provide a safety device for high-voltage capacitor bushings which, with every conceivable break in the outer insulation, reliably precludes the risk of conductive parts falling into the interior of the transformer.
Die gestellte Aufgabe wird gemäß der Erfindung durch eine Sicherungseinrichtung gelöst, wie sie im Patentanspruch 1 angegeben ist; eine vorteilhafte Weiterbildung der Erfindung ergibt sich aus dem Unteranspruch 2.The object is achieved according to the invention by a safety device as specified in
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 veirmieden und auch die nachgeschalteten Anlagenelemente nicht im 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 choke coil or similar devices are avoided in the event of an implementation defect, and the downstream system elements are also not affected. At the same time, the functional reliability and service life of the implementation are not adversely affected.
Der am inneren Umfang des Befestigungsflansches sich nach unten im inneren Durchmesser verengender konische Ring und der als Gegenstück dazu auf dem Kondensatorwickel in Höhe des Befestigungsflansches sich nach oben im Durchmesser erweiternde Ring aus Isolierpapier sind so dimensioniert, daß sich der Kondensatorwickel bei Bruch des Freiluftisolators nach nur kurzer Abwärtsbewegung festklemmt umd so nicht in das Innere des Transformators gelangen kann. Dabei entsteht ein radialer Druck auf den Umfang des Wickels, der dadurch zuasmmengepreßt 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 soll, bis Maßnahmen zur Abschaltung des mit Isolierflüssigkeit gefüllten Hochspannungsgerätes, z.B. des Transformators, ergriffen sind.The conical ring narrowing downwards in the inner diameter on the inner circumference of the fastening flange and the ring made of insulating paper, which increases in diameter as a counterpart to this on the capacitor winding at the height of the fastening flange, are dimensioned such that the capacitor winding is only broken if the outdoor insulator breaks short downward movement so that it cannot get inside the transformer. This creates a radial pressure on the circumference of the roll, which is pressed and solidified in such a way that individual layers are prevented from slipping. The expected formation of wrinkles inside the winding of the paper and the conductive coverings can be accepted because the implementation should now only remain operational for a limited time until measures to switch off the high-voltage device filled with insulating liquid, e.g. of the transformer.
Im Normalbetrieb der unbeschädigten Durchführung tritt diese, die Lebensdauer der Durchführung beeinträchtigende Erscheinung nicht auf.In normal operation of the undamaged bushing, this phenomenon does not affect the life of the bushing.
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 fitted in an evenly distributed manner.
Im folgenden wird die Erfindung anhand einer Zeichnung, die einen Ausführungeweg darstellt, näher erläutert. 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, auf gewickelt. Am oberen Ende des Spannbolzens sind eine Druchfeder 6 angeordnet sowie eine Mutter 7 zum Verspannen der gesamten Anordnung. 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 Durchführung, d.h., wenn die Haltefunktion des Freiluftisolators wegfällt, rutscht der Kondensatorwickel 4 nach unten in den konischen Ring 8 hinein und klemmt sich fest.In the following the invention will be explained in more detail with reference to a drawing which represents an embodiment. The drawing shows a simplified sectional view of a high-voltage bushing, which consists of an
Claims (2)
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.
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 EP0051715A2 (en) | 1982-05-19 |
| EP0051715A3 EP0051715A3 (en) | 1982-11-17 |
| EP0051715B1 true EP0051715B1 (en) | 1986-06-11 |
Family
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 |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0051715B1 (en) |
| DD (1) | DD161044A3 (en) |
| DE (1) | DE3174805D1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010005086B4 (en) * | 2010-01-15 | 2018-05-24 | Siemens Aktiengesellschaft | High-voltage bushing |
| EP2431982B1 (en) * | 2010-09-21 | 2014-11-26 | ABB Technology AG | Plugable feedthrough and high voltage assembly with such a feedthrough |
| EP3618084B1 (en) * | 2018-08-30 | 2021-09-29 | ABB Power Grids Switzerland AG | Electrical bushing having an anti-rotation mounting flange and method for mounting the same |
Family Cites Families (3)
| 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 |
-
1980
- 1980-11-04 DD DD22495080A patent/DD161044A3/en not_active IP Right Cessation
-
1981
- 1981-07-08 EP EP19810105290 patent/EP0051715B1/en not_active Expired
- 1981-07-08 DE DE8181105290T patent/DE3174805D1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0051715A3 (en) | 1982-11-17 |
| DE3174805D1 (en) | 1986-07-17 |
| DD161044A3 (en) | 1984-08-29 |
| EP0051715A2 (en) | 1982-05-19 |
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