EP3133613A1 - Corona ring - Google Patents

Corona ring Download PDF

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Publication number
EP3133613A1
EP3133613A1 EP15181910.9A EP15181910A EP3133613A1 EP 3133613 A1 EP3133613 A1 EP 3133613A1 EP 15181910 A EP15181910 A EP 15181910A EP 3133613 A1 EP3133613 A1 EP 3133613A1
Authority
EP
European Patent Office
Prior art keywords
ring
screen
fastening device
corona
line
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
EP15181910.9A
Other languages
German (de)
French (fr)
Other versions
EP3133613B1 (en
Inventor
Bastian Robben
Henrik Roggow
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Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP15181910.9A priority Critical patent/EP3133613B1/en
Publication of EP3133613A1 publication Critical patent/EP3133613A1/en
Application granted granted Critical
Publication of EP3133613B1 publication Critical patent/EP3133613B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
    • 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
    • H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
    • H01B17/44—Structural association of insulators with corona rings

Definitions

  • Corona rings are used for electrical shielding, for example, in line arresters.
  • the invention relates to a corona ring and a line arrester with a corona ring.
  • Line arresters for overhead lines of power transmission lines are connected at a high-voltage side end to the overhead line and a ground-side end with ground potential, such as the mast of the overhead line. They consist of an elongated cylindrical housing, which is bounded by end fittings that serve the connection. The housing is made of an electrically insulating material and usually has a weatherproof coating, for example made of silicone. Line arresters act as insulators in normal operation and conduct, for example, due to lightning or switching operations occurring overvoltages from the ground down.
  • Line arresters are suspended from the overhead line.
  • the high-voltage side end fitting is connected to a fastening device on the overhead line.
  • the object of the invention is to ensure safe operation of a kausableiters.
  • a coronary ring is provided.
  • a corona ring has a first ring arranged about a longitudinal axis, which has an axially spaced-apart with respect to the longitudinal axis
  • Fastening device is connected.
  • the connection can be carried out, for example, by struts.
  • the struts also effect electrical connection of the first ring to the attachment device.
  • the fastening device serves for fastening the ring to a line arrester.
  • Such a coronary ring is in the DE 32 36 910 A1 shown.
  • Line arresters especially those on high or medium voltage overhead lines, often have a corona ring at the earth's end.
  • a corona ring serves as a simplified Faraday cage shielding often sharp-edged fasteners in the vicinity of the flanges.
  • the corona ring has a flat screen which protects components arranged under the line arrester, in particular an automatic disconnecting device from environmental influences, in particular icing.
  • the combination of the corona ring with a shield provides effective protection, especially against rain, thus preventing icing. It is also very easy to assemble.
  • the screen extends from a circumferential line of the first ring to the fastening device. Since the fastening device usually has a smaller circumference than the first ring, the screen spans a surface which corresponds to a jacket of a truncated cone. The base of the truncated cone is open and is bounded by the first ring.
  • a screen could be made by starting from the DE 32 36 910 A1 a stable fabric, such as glass fiber reinforced plastic, spans over the struts of the fastening device. The screen could also be punched or cut from a sheet steel as a circular segment and rolled up to the screen.
  • Such a screen can then be connected to the fastening device and the first ring, for example by soldering or welding. If the material is electrically conductive as with steel sheet, it can the aspirations are waived. Objects falling onto such a screen, such as pieces of ice, strike the screen at an oblique angle and slide off it. The arranged inside the shield to be protected components are protected so effectively.
  • the first ring is arranged on the inside of the screen. In this way, the first ring can achieve the best electrical shielding effect.
  • the screen is electrically conductive. This can be done by making the screen as described above from an electrically conductive material such as sheet steel or, in the case of the described fabric, by applying an electrically conductive layer to the fabric. As a result, it is possible to dispense with an otherwise electrical connection of the fastening device to the first ring. If the shield is also mechanically stable, it can also serve as a mechanical connection between the fastening device and the first ring.
  • a second ring is connected coaxially and parallel to the first ring with the fastening device.
  • the fastening device is arranged between the first and the second ring.
  • an advantageous embodiment of the invention provides a line arrester, which has an insulating body arranged between two flanges.
  • One of the flanges is usually connected to a high or medium voltage overhead line, the other, earth side, with a ground cable.
  • a corona ring according to the invention is attached with its fastening device to a flange, preferably the earth side, in such a way that the shield extends away from the line conductor.
  • the screen spans over it directly below the line arrester arranged components, such as the connection device of the underground cable or an automatic disconnecting device and protects it so from falling objects.
  • line arresters often have a control ring spaced from the upper end fitting. This serves to even out the voltage distribution over the length of the line arrester.
  • control ring and coronary ring have different tasks, they are structurally very similar.
  • the FIG. 1 shows a hanging on an overhead line 17 line arrester 10.
  • a cylindrical insulating body 11 is arranged, which extends along a longitudinal axis 20.
  • a non-visible active part is arranged in the insulating body 11.
  • This has a voltage-dependent resistor, which practically acts as an insulator below a threshold voltage and becomes conductive above the threshold voltage.
  • the threshold voltage is above the voltages occurring during normal operation. Occurs due to lightning or switching operations an overvoltage the limit voltage is exceeded, the active part becomes conductive and conducts the overvoltage to earth. If the overvoltage has subsided, then the active part acts again as an insulator.
  • the line arrester 10 is composed of several, here five, modules.
  • the individual modules can be manufactured independently and assembled at the installation site.
  • the invention relates to all types of Kausableitern, regardless of whether one-piece or modular composition.
  • the uppermost flange 12 is electrically and mechanically connected to the overhead line 17.
  • the line arrester 10 depends freely on the overhead line 17 down.
  • a control ring 15 is also arranged. This serves to even out the voltage distribution over the length of the line arrester 10. Control rings and conventional corona rings have different tasks, but are structurally very similar.
  • the lowermost flange 12 of the line arrester 10 is connected via a ground cable 14 to the ground, usually a mast of the overhead line.
  • an inventive corona ring 1 with an optional second ring 5 is also arranged.
  • the corona ring 1 has three essential parts which are electrically and mechanically interconnected.
  • the fastening device 3 is a circular or annular disc with a plurality of holes can be screwed by the screws into corresponding threads in the flange 12 to attach the fastening device 3 to the flange 12.
  • the ring 2 is arranged coaxially with the longitudinal axis 20 of the Dunsableiters 10.
  • the first ring 2 has the shape of a torus with a circular cross section.
  • the torus can be massive or hollow.
  • the torus is closed here, so it describes a full circumference of 360 °.
  • the torus can also be designed open, so describe a circumference of less than 360 °.
  • the ends should then have a radius of curvature that is about half the thickness of the torus.
  • the cross section of the torus is not limited to the circular shape. Also conceivable are semicircular or three-quarter circular cross-sections, which may also be hollow.
  • a high voltage is applied to the earth-side flange 12. This voltage is also applied to the first ring 2.
  • the interior of such a ring is almost free of electric fields. The lying within the first ring 2 components, which often have peaks or edges are so in the field-free space whereby voltage spikes are avoided.
  • the shield 4 Since the fastening device 3 usually has a smaller diameter than the first ring 2, this surface and thus the shield 4 have the shape of a truncated cone shell.
  • the shield 4 extends axially, ie in the direction of the longitudinal axis 20, from the fastening device 3 to the first ring 2 and radially around the longitudinal axis.
  • the screen 4 At its upper end, the screen 4 is connected to the fastening device 3, at its lower end to the first ring 2.
  • the connection can be made by welding, soldering, gluing, riveting or the like.
  • the first ring 2 as shown here, arranged on the inside of the screen 4.
  • the screen 4 is made of an electrically conductive material such as aluminum or steel sheet. The screen 4 thus serves to protect the lying within the screen 4 Components such as the separating device 13, as well as the mechanical and electrical connection of the first ring 2 with the fastening device. 3
  • an automatic separator 13 is arranged within the screen 4. Such a separation device throws off the earth cable in case of malfunction of the line arrester, for example, by a solder joint melted or a pyrotechnic charge is triggered.
  • the separating device 13 On one side, the separating device 13 is connected by means of a connecting cable 16 with the ground-side flange 12 of the Dunsableiters 10, on the other with the ground cable 14. If the separator 13 is triggered, the ground cable 14 falls down.
  • the corona ring 1 must therefore be open at the bottom, on the one hand in order to mount the separator 13 with the ground cable at all, on the one hand to allow a dropping of the underground cable.
  • First ring 2 and second ring 5 are arranged parallel and coaxial with one another and with respect to the longitudinal axis 20.
  • the fastening device 3 is arranged between the first ring 2 and the second ring 5.
  • the second ring 5 is connected by means of struts 6 with the fastening device 3.
  • the connection can also be done by welding, soldering or gluing, or by screwing the fastening device 3 and the struts 6 with the flange 12.
  • FIGS. 4 to 7 show schematically different embodiments of the invention, each having specific advantages to have. Since the explanations are similar to those already described, the differences are mainly discussed.
  • FIG. 4 shows an embodiment in which the first ring 2 similar to the second ring 5 in the FIGS. 1 to 3 is attached by means of struts 6 to the fastening device 3.
  • An attached to the fastening device 3 screen 4 in the form of a truncated cone extends radially and axially in the form of a truncated cone of the fastening device 3 in the direction of the first ring 2.
  • the screen 4 is not a direct connection between the fastening device 3 and the first ring 2. Nevertheless he fulfills its protective effect for arranged within the screen 4 components such as the automatic separation device 13.
  • Such a screen 4 would preferably made of an electrically insulating material.
  • the severing device 13 is by means of a bracket 18, as well as in the Figures 3 to be seen, gimballed.
  • a protective cap 22 is attached to the ground cable 14 by means of a clamp 23.
  • the underground cable 14 is guided through an opening of the protective cap 22.
  • the protective cap 22 is preferably made of an electrically insulating material. Bracket 18, separating device 13 and protective cap 22 are optional embodiments that can be combined with all embodiments.
  • FIG. 5 shows an embodiment similar to the FIGS. 1 to 3
  • the first ring 2 designed as a hollow torus with an open cross-section.
  • the open edges of Torusmantels lie within the outer contour.
  • the first ring 2 is arranged on the inside of the screen 4. That is, the diameter of the circular connecting line of the first ring 2 and shield 4 is larger than the torus diameter T of the first ring 2.
  • FIG. 6 shows an embodiment similar to the FIGS. 1 to 3 in which, in contrast to the first ring 2 is not on the inside of the screen 4, but is arranged on the Torusmantel centered to the screen 4.
  • that is Diameter of the circular connecting line of the first ring 2 and screen 4 is approximately equal to the torus diameter T, the first ring second
  • FIG. 7 shows an embodiment in which the first ring 2 is arranged on the outside of the screen 4.
  • the diameter of the circular connecting line of the first ring 2 and the screen 4 is smaller than the torus diameter T 1 of the first ring 2.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Thermistors And Varistors (AREA)

Abstract

Die Erfindung betrifft einen Koronaring und einen Leitungsableiter mit einem solchen Koronaring. Der Koronaring (1) weist einen um eine Längsachse (20) angeordneten ersten Ring (2) und einer vom ersten Ring (2) axial beabstandeten und mit dem ersten Ring (2) verbundenen Befestigungsvorrichtung (3) zur Befestigung des Koronarings (1) an einem Leitungsableiter (10) auf. Erfindungsgemäß ist ein flächiger Schirm (4) zum Schutz von einem unter dem Leitungsableiter (10) angeordneten Bauelement vor Umwelteinflüssen vorgesehen.The invention relates to a corona ring and a line arrester with such a corona ring. The corona ring (1) has a first ring (2) arranged around a longitudinal axis (20) and a fastening device (3) axially spaced from the first ring (2) and connected to the first ring (2) for fastening the corona ring (1) a line arrester (10). According to the invention, a planar screen (4) for the protection of a component arranged under the line conductor (10) from environmental influences is provided.

Description

Koronaringe dienen der elektrischen Abschirmung beispielsweise bei Leitungsableitern. Die Erfindung betrifft einen Koronaring und einen Leitungsableiter mit einem Koronaring.Corona rings are used for electrical shielding, for example, in line arresters. The invention relates to a corona ring and a line arrester with a corona ring.

Leitungsableiter für Freileitungen von Stromübertragungsleitungen sind an einem hochspannungsseitigen Ende mit der Freileitung verbunden und mit einem erdseitigen Ende mit Erdpotential, beispielsweise dem Mast der Freileitung. Sie bestehen aus einem langestreckten zylindrischen Gehäuse, das von Endarmaturen begrenzt wird, die dem Anschluss dienen. Das Gehäuse ist aus einem elektrisch isolierenden Material hergestellt und weist meist einen wetterfesten Überzug beispielsweise aus Silikon auf. Leitungsableiter wirken im Normalbetrieb als Isolatoren und leiten beispielsweise durch Blitzeinschlag oder Schaltvorgänge auftretenden Überspannungen zur Erde hin ab.Line arresters for overhead lines of power transmission lines are connected at a high-voltage side end to the overhead line and a ground-side end with ground potential, such as the mast of the overhead line. They consist of an elongated cylindrical housing, which is bounded by end fittings that serve the connection. The housing is made of an electrically insulating material and usually has a weatherproof coating, for example made of silicone. Line arresters act as insulators in normal operation and conduct, for example, due to lightning or switching operations occurring overvoltages from the ground down.

Leitungsableiter sind hängend an der Freileitung befestigt. Dabei ist die hochspannungsseitige Endarmatur mit einer Befestigungsvorrichtung an der Freileitung verbunden.Line arresters are suspended from the overhead line. In this case, the high-voltage side end fitting is connected to a fastening device on the overhead line.

Unter der erdseitigen Endarmatur sind häufig Befestigungsvorrichtungen für das Erdkabel und automatische Abtrennvorrichtungen oder andere Vorrichtungen angeordnet. In kälteren Regionen tritt häufig das Problem auf, dass die Abtrennvorrichtung vereist und dadurch womöglich nicht ordnungsgemäß auslöst.Under the earth-side end fitting fastening devices for the underground cable and automatic disconnecting devices or other devices are often arranged. In colder regions, the problem often arises that the separation device ices up and thus may not trigger properly.

Aufgabe der Erfindung ist es, einen sicheren Betrieb eines Leitungsableiters zu gewährleisten.The object of the invention is to ensure safe operation of a Leitungsableiters.

Dazu ist ein Koronaring vorgesehen. Ein solcher Koronaring weist einen um eine Längsachse angeordneten ersten Ring auf, der mit einer axial bezogen auf die Längsachse beabstandeten Befestigungsvorrichtung verbunden ist. Die Verbindung kann beispielsweise durch Streben ausgeführt sein. Die Streben bewirken auch eine elektrische Verbindung des ersten Rings mit der Befestigungsvorrichtung. Die Befestigungsvorrichtung dient zur Befestigung des Rings an einem Leitungsableiter. Ein solcher Koronaring ist in der DE 32 36 910 A1 gezeigt.For this purpose, a coronary ring is provided. Such a corona ring has a first ring arranged about a longitudinal axis, which has an axially spaced-apart with respect to the longitudinal axis Fastening device is connected. The connection can be carried out, for example, by struts. The struts also effect electrical connection of the first ring to the attachment device. The fastening device serves for fastening the ring to a line arrester. Such a coronary ring is in the DE 32 36 910 A1 shown.

Leitungsableiter, insbesondere solche an Hoch- oder Mittelspannungsfreileitungen, weisen am erdseitigen Ende häufig einen Koronaring auf. Ein solcher Koronaring dient als vereinfachter Faradayscher Käfig der Abschirmung von oft scharfkantigen Befestigungselementen in der Umgebung der Flansche.Line arresters, especially those on high or medium voltage overhead lines, often have a corona ring at the earth's end. Such a corona ring serves as a simplified Faraday cage shielding often sharp-edged fasteners in the vicinity of the flanges.

Erfindungsgemäß ist vorgesehen, dass der Koronaring einen flächigen Schirm aufweist, der unter dem Leitungsableiter angeordnete Bauelemente, insbesondere eine automatische Abtrennvorrichtung vor Umwelteinflüssen, insbesondere Vereisung schützt. Die Kombination des Koronarings mit einem Schirm bewirkt einen effektiven Schutz besonders vor Regen und verhindert damit eine Vereisung. Sie ist außerdem besonders einfach zu montieren.According to the invention, it is provided that the corona ring has a flat screen which protects components arranged under the line arrester, in particular an automatic disconnecting device from environmental influences, in particular icing. The combination of the corona ring with a shield provides effective protection, especially against rain, thus preventing icing. It is also very easy to assemble.

In einer bevorzugten Ausgestaltung der Erfindung erstreckt sich der Schirm von einer Umfangslinie des ersten Rings zur Befestigungsvorrichtung. Da die Befestigungsvorrichtung meist einen kleineren Umfang hat als der erste Ring, überspannt der Schirm dabei eine Fläche, die einem Mantel eines Kegelstumpfes entspricht. Die Grundfläche des Kegelstumpfes ist dabei offen und wird von dem ersten Ring begrenzt. Ein solcher Schirm könnte hergestellt werden, indem man ausgehend von der DE 32 36 910 A1 ein stabiles Gewebe, wie glasfaserverstärkten Kunststoff, über die Streben der Befestigungsvorrichtung spannt. Der Schirm könnte auch aus einem Stahlblech als Kreisringsegment ausgestanzt oder geschnitten werden und zum Schirm aufgerollt werden. Ein solcher Schirm kann dann mit der Befestigungsvorrichtung und dem ersten Ring beispielsweise durch Löten oder Schweißen verbunden werden. Wenn das Material wie beim Stahlblech elektrisch leitend ist, kann auf die Streben verzichtet werden. Auf einen solchen Schirm herabfallende Objekte wie Eisstücke treffen in einem schrägen Winkel auf den Schirm auf und gleiten an ihm ab. Die innerhalb des Schirms angeordneten zu schützenden Bauelemente sind so besonders effektiv geschützt.In a preferred embodiment of the invention, the screen extends from a circumferential line of the first ring to the fastening device. Since the fastening device usually has a smaller circumference than the first ring, the screen spans a surface which corresponds to a jacket of a truncated cone. The base of the truncated cone is open and is bounded by the first ring. Such a screen could be made by starting from the DE 32 36 910 A1 a stable fabric, such as glass fiber reinforced plastic, spans over the struts of the fastening device. The screen could also be punched or cut from a sheet steel as a circular segment and rolled up to the screen. Such a screen can then be connected to the fastening device and the first ring, for example by soldering or welding. If the material is electrically conductive as with steel sheet, it can the aspirations are waived. Objects falling onto such a screen, such as pieces of ice, strike the screen at an oblique angle and slide off it. The arranged inside the shield to be protected components are protected so effectively.

Vorzugsweise ist der erste Ring auf der Innenseite des Schirms angeordnet. Auf diese Weise kann der erste Ring die beste elektrische Abschirmwirkung erzielen.Preferably, the first ring is arranged on the inside of the screen. In this way, the first ring can achieve the best electrical shielding effect.

Vorteilhaft ist der Schirm elektrisch leitend. Dies kann erfolgen, indem der Schirm wie oben beschrieben aus einem elektrisch leitenden Material wie Stahlblech hergestellt ist, oder im Falle des beschriebenen Gewebes, indem eine elektrisch leitende Schicht auf das Gewebe aufgebracht wird. Dadurch kann auf eine anderweitige elektrische Verbindung der Befestigungsvorrichtung mit dem ersten Ring verzichtet werden. Ist der Schirm zudem mechanisch stabil ausgeführt kann er außerdem als mechanische Verbindung zwischen Befestigungsvorrichtung und erstem Ring dienen.Advantageously, the screen is electrically conductive. This can be done by making the screen as described above from an electrically conductive material such as sheet steel or, in the case of the described fabric, by applying an electrically conductive layer to the fabric. As a result, it is possible to dispense with an otherwise electrical connection of the fastening device to the first ring. If the shield is also mechanically stable, it can also serve as a mechanical connection between the fastening device and the first ring.

Es wird auch als vorteilhaft angesehen, wenn ein zweiter Ring koaxial und parallel zum ersten Ring mit der Befestigungsvorrichtung verbunden ist. Dabei ist die Befestigungsvorrichtung zwischen dem ersten und dem zweiten Ring angeordnet. Ein solcher Koronaring bewirkt eine besonders effektive elektrische Abschirmung und schützt unter dem Schirm angeordnete Objekte vor mechanischen Beschädigungen durch herabfallende Objekte.It is also considered advantageous if a second ring is connected coaxially and parallel to the first ring with the fastening device. In this case, the fastening device is arranged between the first and the second ring. Such a corona ring effects a particularly effective electrical shielding and protects objects arranged under the shield from mechanical damage caused by falling objects.

Des Weiteren sieht eine vorteilhafte Ausgestaltung der Erfindung einen Leitungsableiter vor, der einen zwischen zwei Flanschen angeordneten Isolierkörper aufweist. Einer der Flansche wird üblicherweise mit einer Hoch- oder Mittelspannungsfreileitung verbunden, der andere, erdseitige, mit einem Erdkabel. Ein erfindungsgemäßer Koronaring ist mit seiner Befestigungsvorrichtung an einem Flansch, vorzugsweise dem erdseitigen, derart befestigt, dass sich der Schirm vom Leitungsableiter weg erstreckt. Der Schirm überspannt dabei direkt unter dem Leitungsableiter angeordnete Bauelemente, wie die Anschlussvorrichtung des Erdkabels oder eine automatische Abtrennvorrichtung und schützt diese so vor herabfallenden Objekten.Furthermore, an advantageous embodiment of the invention provides a line arrester, which has an insulating body arranged between two flanges. One of the flanges is usually connected to a high or medium voltage overhead line, the other, earth side, with a ground cable. A corona ring according to the invention is attached with its fastening device to a flange, preferably the earth side, in such a way that the shield extends away from the line conductor. The screen spans over it directly below the line arrester arranged components, such as the connection device of the underground cable or an automatic disconnecting device and protects it so from falling objects.

Leitungsableiter weisen zusätzlich oft einen Steuerring auf, der beabstandet von der oberen Endarmatur angeordnet. Dieser dient der Vergleichmäßigung der Spannungsverteilung über die Baulänge des Leitungsableiters.In addition, line arresters often have a control ring spaced from the upper end fitting. This serves to even out the voltage distribution over the length of the line arrester.

Steuerring und Koronaring haben zwar unterschiedliche Aufgaben, sind konstruktiv jedoch sehr ähnlich.Although the control ring and coronary ring have different tasks, they are structurally very similar.

Im Folgenden wird die Erfindung anhand der Zeichnungen näher erläutert. Dabei zeigen:

Figur 1
einen Leitungsableiter mit einem erfindungsgemäßen Koronaring,
Figur 2 bis 3
eine Detaildarstellung eines Ausschnitts aus Figur 1,
Figur 4 bis 7
alternative Ausführungen eines erfindungsgemäßen Koronarings
In the following the invention will be explained in more detail with reference to the drawings. Showing:
FIG. 1
a line arrester with a corona ring according to the invention,
FIGS. 2 to 3
a detail of a section FIG. 1 .
FIGS. 4 to 7
alternative embodiments of a corona ring according to the invention

Einander entsprechende Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen.Corresponding parts are provided in all figures with the same reference numerals.

Die Figur 1 zeigt einen an einer Freileitung 17 hängenden Leitungsableiter 10. Zwischen zwei Flanschen 12 ist ein zylindrischer Isolierkörper 11 angeordnet, der sich entlang einer Längsachse 20 erstreckt. In dem Isolierkörper 11 ist ein nicht sichtbares Aktivteil angeordnet. Dieses weist einen spannungsabhängigen Widerstand auf, der unterhalb einer Grenzspannung praktisch als Isolator wirkt und oberhalb der Grenzspannung leitend wird. Die Grenzspannung liegt dabei oberhalb der im Normalbetrieb auftretenden Spannungen. Tritt durch Blitzeinschlag oder Schaltvorgänge eine Überspannung auf, so wird die Grenzspannung überschritten, das Aktivteil wird leitend und leitet die Überspannung zur Erde hin ab. Ist die Überspannung abgeklungen, so wirkt das Aktivteil wieder als Isolator.The FIG. 1 shows a hanging on an overhead line 17 line arrester 10. Between two flanges 12, a cylindrical insulating body 11 is arranged, which extends along a longitudinal axis 20. In the insulating body 11, a non-visible active part is arranged. This has a voltage-dependent resistor, which practically acts as an insulator below a threshold voltage and becomes conductive above the threshold voltage. The threshold voltage is above the voltages occurring during normal operation. Occurs due to lightning or switching operations an overvoltage the limit voltage is exceeded, the active part becomes conductive and conducts the overvoltage to earth. If the overvoltage has subsided, then the active part acts again as an insulator.

In der gezeigten Ausführung ist der Leitungsableiter 10 aus mehreren, hier fünf, Modulen zusammengesetzt. Die einzelnen Module können unabhängig hergestellt und am Montageort zusammengebaut werden. Die Erfindung betrifft alle Arten von Leitungsableitern, unabhängig ob einteilig oder modular zusammengesetzt. Der oberste Flansch 12 ist mit der Freileitung 17 elektrisch und mechanisch verbunden. Der Leitungsableiter 10 hängt frei von der Freileitung 17 herunter.In the embodiment shown, the line arrester 10 is composed of several, here five, modules. The individual modules can be manufactured independently and assembled at the installation site. The invention relates to all types of Leitungsableitern, regardless of whether one-piece or modular composition. The uppermost flange 12 is electrically and mechanically connected to the overhead line 17. The line arrester 10 depends freely on the overhead line 17 down.

Am obersten Flansch 12 ist außerdem ein Steuerring 15 angeordnet. Dieser dient der Vergleichmäßigung der Spannungsverteilung über die Baulänge des Leitungsableiters 10. Steuerringe und herkömmliche Koronaringe haben unterschiedliche Aufgaben, sind konstruktiv jedoch sehr ähnlich.At the top flange 12, a control ring 15 is also arranged. This serves to even out the voltage distribution over the length of the line arrester 10. Control rings and conventional corona rings have different tasks, but are structurally very similar.

Der unterste Flansch 12 des Leitungsableiters 10 ist über ein Erdkabel 14 mit der Erde, meist einem Mast der Freileitung, verbunden.The lowermost flange 12 of the line arrester 10 is connected via a ground cable 14 to the ground, usually a mast of the overhead line.

Am untersten Flansch 12 ist außerdem ein erfindungsgemäßer Koronaring 1 mit einem optionalen zweiten Ring 5 angeordnet.At the bottom flange 12, an inventive corona ring 1 with an optional second ring 5 is also arranged.

Die Figuren 2 und 3 zeigen diesen Bereich im Detail in unterschiedlichen Perspektiven. Der erfindungsgemäße Koronaring 1 weist drei wesentliche Teile auf, die elektrisch und mechanisch miteinander verbunden sind. Eine Befestigungsvorrichtung 3, einen ersten Ring 2 und einen Schirm 4. Die Befestigungsvorrichtung 3 ist eine kreis- oder kreisringförmige Scheibe mit mehreren Löchern durch die Schrauben in entsprechende Gewinde im Flansch 12 eingeschraubt werden können, um die Befestigungsvorrichtung 3 am Flansch 12 zu befestigen. Auf einer dem Leitungsableiter 10 abgewandten Seite der Befestigungsvorrichtung 3 ist ein erster Ring 2 angeordnet. Der Ring 2 ist dabei koaxial mit der Längsachse 20 des Leitungsableiters 10 angeordnet. Der erste Ring 2 weist die Form eines Torus mit kreisförmigem Querschnitt auf. Der Torus kann dabei massiv oder hohl sein. Der Torus ist hier geschlossen, beschreibt also einen vollen Kreisumfang von 360°. Der Torus kann auch offen gestaltet sein, also einen Umfang von weniger als 360° beschreiben. Die Enden sollten dann einen Abrundungsradius aufweisen, der etwa der halben Dicke des Torus entspricht. Der Querschnitt des Torus ist auch nicht auf die Kreisform beschränkt. Denkbar sind auch halbkreisförmige oder dreiviertelkreisförmige Querschnitte, die auch hohl sein können. Im Falle einer Überspannung liegt am erdseitigen Flansch 12 eine hohe Spannung an. Diese Spannung liegt auch am ersten Ring 2 an. Gemäß den Gesetzen der Elektrostatik ist das Innere eines solchen Ringes fast frei von elektrischen Feldern. Die innerhalb des ersten Ringes 2 liegenden Bauteile, die häufig Spitzen oder Kanten aufweisen, befinden sich so im feldfreien Raum wodurch Spannungsspitzen vermieden werden.The Figures 2 and 3 show this area in detail in different perspectives. The corona ring 1 according to the invention has three essential parts which are electrically and mechanically interconnected. A fastening device 3, a first ring 2 and a screen 4. The fastening device 3 is a circular or annular disc with a plurality of holes can be screwed by the screws into corresponding threads in the flange 12 to attach the fastening device 3 to the flange 12. On a side facing away from the line arrester 10 side of the fastening device 3, a first ring 2 is arranged. The ring 2 is arranged coaxially with the longitudinal axis 20 of the Leitungsableiters 10. The first ring 2 has the shape of a torus with a circular cross section. The torus can be massive or hollow. The torus is closed here, so it describes a full circumference of 360 °. The torus can also be designed open, so describe a circumference of less than 360 °. The ends should then have a radius of curvature that is about half the thickness of the torus. The cross section of the torus is not limited to the circular shape. Also conceivable are semicircular or three-quarter circular cross-sections, which may also be hollow. In the case of an overvoltage, a high voltage is applied to the earth-side flange 12. This voltage is also applied to the first ring 2. According to the laws of electrostatics, the interior of such a ring is almost free of electric fields. The lying within the first ring 2 components, which often have peaks or edges are so in the field-free space whereby voltage spikes are avoided.

Ein flächiger Schirm 4 überspannt die Fläche zwischen Befestigungsvorrichtung 3 und erstem Ring 2. Da die Befestigungsvorrichtung 3 meist einen kleineren Durchmesser aufweist, als der erste Ring 2, weist diese Fläche und damit der Schirm 4 die Form eines Kegelstumpfmantels auf. Der Schirm 4 erstreckt sich dabei axial, also in Richtung der Längsachse 20, von der Befestigungsvorrichtung 3 zum ersten Ring 2 und radial um die Längsachse herum. An seinem oberen Ende ist der Schirm 4 mit der Befestigungsvorrichtung 3 verbunden, an seinem unteren Ende mit dem ersten Ring 2. Die Verbindung kann jeweils durch Schweißen, Löten, Kleben, Nieten oder Ähnliches erfolgen. Vorzugsweise ist der erste Ring 2, wie hier dargestellt, auf der Innenseite des Schirms 4 angeordnet. Ebenfalls vorzugsweise ist der Schirm 4 aus einem elektrisch leitfähigen Material wie Aluminium oder Stahlblech gefertigt. Der Schirm 4 dient so zum Schutz der innerhalb des Schirms 4 liegenden Bauelemente wie der Abtrennvorrichtung 13, als auch zur mechanischen und elektrischen Verbindung des ersten Rings 2 mit der Befestigungsvorrichtung 3.Since the fastening device 3 usually has a smaller diameter than the first ring 2, this surface and thus the shield 4 have the shape of a truncated cone shell. The shield 4 extends axially, ie in the direction of the longitudinal axis 20, from the fastening device 3 to the first ring 2 and radially around the longitudinal axis. At its upper end, the screen 4 is connected to the fastening device 3, at its lower end to the first ring 2. The connection can be made by welding, soldering, gluing, riveting or the like. Preferably, the first ring 2, as shown here, arranged on the inside of the screen 4. Also preferably, the screen 4 is made of an electrically conductive material such as aluminum or steel sheet. The screen 4 thus serves to protect the lying within the screen 4 Components such as the separating device 13, as well as the mechanical and electrical connection of the first ring 2 with the fastening device. 3

Innerhalb des Schirms 4 ist eine automatische Trennvorrichtung 13 angeordnet. Eine solche Trennvorrichtung wirft bei einer Fehlfunktion des Leitungsableiters das Erdkabel ab, indem beispielsweise eine Lötstelle durchgeschmolzen oder eine pyrotechnische Ladung ausgelöst wird. Auf einer Seite ist die Trennvorrichtung 13 mittels eines Anschlusskabels 16 mit dem erdseitigen Flansch 12 des Leitungsableiters 10 verbunden, auf der anderen mit dem Erdkabel 14. Wird die Trennvorrichtung 13 ausgelöst, so fällt das Erdkabel 14 herab. Der Koronaring 1 muss also nach unten offen sein, einerseits um die Trennvorrichtung 13 mit dem Erdkabel überhaupt montieren zu können, einerseits um ein Abwerfen des Erdkabels zu ermöglichen. Es ist allerdings denkbar, eine hier nicht dargestellte kreisförmige oder kugelschalenartige Kappe 22 unterhalb, also auf der dem Leitungsableiter 10 abgewandten Seite, der Trennvorrichtung 13 am Erdkabel 14 zu befestigen, die bei Auslösen der Trennvorrichtung 13 mit dem Erdkabel 14 abgeworfen wird.Within the screen 4, an automatic separator 13 is arranged. Such a separation device throws off the earth cable in case of malfunction of the line arrester, for example, by a solder joint melted or a pyrotechnic charge is triggered. On one side, the separating device 13 is connected by means of a connecting cable 16 with the ground-side flange 12 of the Leitungsableiters 10, on the other with the ground cable 14. If the separator 13 is triggered, the ground cable 14 falls down. The corona ring 1 must therefore be open at the bottom, on the one hand in order to mount the separator 13 with the ground cable at all, on the one hand to allow a dropping of the underground cable. However, it is conceivable that a not shown here circular or spherical shell-like cap 22 below, so on the side facing away from the line arrester 10 side, the separator 13 to secure the ground cable 14, which is dropped when the disconnecting device 13 with the underground cable 14.

Oberhalb der Befestigungsvorrichtung 3, also auf der dem Leitungsableiter 10 zugewandten Seite, ist ein optionaler zweiter Ring 5 angeordnet. Erster Ring 2 und zweiter Ring 5 sind parallel und koaxial zueinander und zur Längsachse 20 angeordnet. Die Befestigungsvorrichtung 3 ist zwischen dem ersten Ring 2 und dem zweiten Ring 5 angeordnet. Der zweite Ring 5 ist mittels Streben 6 mit der Befestigungsvorrichtung 3 verbunden. Die Verbindung kann ebenfalls durch Schweißen, Löten oder Kleben erfolgen, oder auch durch Verschrauben der Befestigungsvorrichtung 3 und der Streben 6 mit dem Flansch 12. Durch den zweiten Ring 5 wird der feldfreie Raum auf den Raum zwischen den beiden Ringen 2, 5 erweitert.Above the fastening device 3, ie on the line conductor 10 side facing an optional second ring 5 is arranged. First ring 2 and second ring 5 are arranged parallel and coaxial with one another and with respect to the longitudinal axis 20. The fastening device 3 is arranged between the first ring 2 and the second ring 5. The second ring 5 is connected by means of struts 6 with the fastening device 3. The connection can also be done by welding, soldering or gluing, or by screwing the fastening device 3 and the struts 6 with the flange 12. By the second ring 5, the field-free space is extended to the space between the two rings 2, 5.

Die Figuren 4 bis 7 zeigen schematisch unterschiedliche Ausführungsformen der Erfindung, die jeweils spezifische Vorteile haben. Da die Ausführungen ähnlich der bereist beschriebenen sind, wird vorwiegend auf die Unterschiede eingegangen.The FIGS. 4 to 7 show schematically different embodiments of the invention, each having specific advantages to have. Since the explanations are similar to those already described, the differences are mainly discussed.

Die Figur 4 zeigt eine Ausführung, bei der der erste Ring 2 ähnlich wie der zweite Ring 5 in den Figuren 1 bis 3 mittels Streben 6 an der Befestigungsvorrichtung 3 befestigt ist. Ein an der Befestigungsvorrichtung 3 befestigter Schirm 4 in Form eines Kegelstumpfmantels erstreckt sich radial und axial in Form eines Kegelstumpfmantels von der Befestigungsvorrichtung 3 in Richtung des ersten Rings 2. Hier stellt der Schirm 4 keine direkte Verbindung zwischen Befestigungsvorrichtung 3 und erstem Ring 2 dar. Dennoch erfüllt er seine Schutzwirkung für innerhalb des Schirms 4 angeordnete Bauelemente wie die automatische Abtrennvorrichtung 13. Ein solcher Schirm 4 würde vorzugsweise aus einem elektrisch isolierenden Material hergestellt. Die Abtrennvorrichtung 13 ist mittels eines Bügels 18, wie auch in der Figuren 3 zu sehen, kardanisch aufgehängt. Unterhalb des ersten Rings 2 ist am Erdkabel 14 mittels einer Klemme 23 eine Schutzkappe 22 befestigt. Das Erdkabel 14 ist durch eine Öffnung der Schutzkappe 22 geführt. Die Schutzkappe 22 ist vorzugsweise aus einem elektrisch isolierenden Material. Bügel 18, Abtrennvorrichtung 13 und Schutzkappe 22 sind optionale Ausgestaltungen, die mit allen Ausführungsformen kombinierbar sind.The FIG. 4 shows an embodiment in which the first ring 2 similar to the second ring 5 in the FIGS. 1 to 3 is attached by means of struts 6 to the fastening device 3. An attached to the fastening device 3 screen 4 in the form of a truncated cone extends radially and axially in the form of a truncated cone of the fastening device 3 in the direction of the first ring 2. Here, the screen 4 is not a direct connection between the fastening device 3 and the first ring 2. Nevertheless he fulfills its protective effect for arranged within the screen 4 components such as the automatic separation device 13. Such a screen 4 would preferably made of an electrically insulating material. The severing device 13 is by means of a bracket 18, as well as in the Figures 3 to be seen, gimballed. Below the first ring 2, a protective cap 22 is attached to the ground cable 14 by means of a clamp 23. The underground cable 14 is guided through an opening of the protective cap 22. The protective cap 22 is preferably made of an electrically insulating material. Bracket 18, separating device 13 and protective cap 22 are optional embodiments that can be combined with all embodiments.

Die Figur 5 zeigt eine Ausführung ähnlich den Figuren 1 bis 3 allerdings ist hier der erste Ring 2 als hohler Torus mit offenem Querschnitt ausgeführt. Die offenen Kanten des Torusmantels liegen dabei innerhalb der Außenkontur. Wie in den Figuren 1 bis 3 ist der erste Ring 2 auf der Innenseite des Schirms 4 angeordnet. Das heißt, der Durchmesser der kreisförmigen Verbindungslinie von erstem Ring 2 und Schirm 4 ist größer, als der Torusdurchmesser T, des ersten Rings 2.The FIG. 5 shows an embodiment similar to the FIGS. 1 to 3 However, here is the first ring 2 designed as a hollow torus with an open cross-section. The open edges of Torusmantels lie within the outer contour. As in the FIGS. 1 to 3 the first ring 2 is arranged on the inside of the screen 4. That is, the diameter of the circular connecting line of the first ring 2 and shield 4 is larger than the torus diameter T of the first ring 2.

Die Figur 6 zeigt eine Ausführung ähnlich den Figuren 1 bis 3, bei der im Unterschied dazu der erste Ring 2 nicht auf der Innenseite des Schirms 4 ist, sondern am Torusmantel mittig zum Schirm 4 angeordnet ist. Anders ausgedrückt ist der Durchmesser der kreisförmigen Verbindungslinie von erstem Ring 2 und Schirm 4 etwa gleich dem Torusdurchmesser T, des ersten Rings 2.The FIG. 6 shows an embodiment similar to the FIGS. 1 to 3 in which, in contrast to the first ring 2 is not on the inside of the screen 4, but is arranged on the Torusmantel centered to the screen 4. In other words, that is Diameter of the circular connecting line of the first ring 2 and screen 4 is approximately equal to the torus diameter T, the first ring second

Die Figur 7 zeigt eine Ausführung, bei der der erste Ring 2 auf der Außenseite des Schirms 4 angeordnet ist. Anders ausgedrückt ist der Durchmesser der kreisförmigen Verbindungslinie von erstem Ring 2 und Schirm 4 kleiner als der Torusdurchmesser T, des ersten Rings 2.The FIG. 7 shows an embodiment in which the first ring 2 is arranged on the outside of the screen 4. In other words, the diameter of the circular connecting line of the first ring 2 and the screen 4 is smaller than the torus diameter T 1 of the first ring 2.

Claims (7)

Koronaring (1) mit einem um eine Längsachse (20) angeordneten ersten Ring (2) und einer vom ersten Ring (2) axial beabstandeten und mit dem ersten Ring (2) verbundenen Befestigungsvorrichtung (3) zur Befestigung des Koronarings (1) an einem Leitungsableiter (10),
gekennzeichnet durch
einen flächigen Schirm (4) zum Schutz von einem unter dem Leitungsableiter (10) angeordneten Bauelement vor Umwelteinflüssen.Corona ring (1) with a first ring (2) arranged around a longitudinal axis (20) and a fastening device (3) axially spaced from the first ring (2) and connected to the first ring (2) for fastening the corona ring (1) to a Line arrester (10),
marked by
a flat screen (4) for the protection of a device arranged under the Leitungsableiter (10) from environmental influences. Koronaring (1) nach Anspruch 1,
dadurch gekennzeichnet, dass
sich der erste Schirm (4) von einer Umfangslinie des ersten Rings (2) zur Befestigungsvorrichtung (3) erstreckt.Corona ring (1) according to claim 1,
characterized in that
the first screen (4) extends from a circumferential line of the first ring (2) to the fastening device (3). Koronaring (1) nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet, dass
der erste Ring (2) auf der Innenseite des Schirms (4) angeordnet ist.Corona ring (1) according to one of claims 1 or 2,
characterized in that
the first ring (2) is arranged on the inside of the screen (4). Koronaring (1) nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass
der Schirm (4) elektrisch leitend ist.Corona ring (1) according to one of claims 1 to 3,
characterized in that
the shield (4) is electrically conductive. Koronaring (1) nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass
ein zweiter Ring (5) koaxial und parallel zum ersten Ring (4) mit der Befestigungsvorrichtung (3) verbunden ist, wobei die Befestigungsvorrichtung (3) zwischen dem ersten und dem zweiten Ring (4, 5) angeordnet ist.Corona ring (1) according to one of claims 1 to 4,
characterized in that
a second ring (5) is coaxially and parallel to the first ring (4) connected to the fastening device (3), wherein the fastening device (3) between the first and the second ring (4, 5) is arranged. Leitungsableiter (10) mit einem zwischen zwei Flanschen (12) angeordneten Isolierkörper (11), wobei an einem Flansch (12) ein Koronaring (1) nach einem der Ansprüche 1 bis 4 mit seiner Befestigungsvorrichtung (3) derart befestigt ist, dass sich der Schirm (4) vom Leitungsableiter (10) weg erstreckt.Conductor (10) having an insulating body (11) arranged between two flanges (12), wherein a corona ring (1) according to one of Claims 1 to 4 is fastened with its fastening device (3) to a flange (12) in such a way that the Screen (4) from the line arrester (10) extends away. Leitungsableiter (10) nach Anspruch 6,
dadurch gekennzeichnet, dass
eine mit dem Leitungsableiter (10) elektrisch verbundene automatische Abtrennvorrichtung (13) innerhalb des Schirms (4) angeordnet ist.Line arrester (10) according to claim 6,
characterized in that
an automatic disconnecting device (13) electrically connected to the line conductor (10) is arranged inside the screen (4).
EP15181910.9A 2015-08-21 2015-08-21 Line arrester Not-in-force EP3133613B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15181910.9A EP3133613B1 (en) 2015-08-21 2015-08-21 Line arrester

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Application Number Priority Date Filing Date Title
EP15181910.9A EP3133613B1 (en) 2015-08-21 2015-08-21 Line arrester

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EP3133613A1 true EP3133613A1 (en) 2017-02-22
EP3133613B1 EP3133613B1 (en) 2020-12-16

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ID=53969221

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020052965A1 (en) * 2018-09-13 2020-03-19 Siemens Aktiengesellschaft Corona ring for a high-voltage apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1957985A (en) * 1931-01-26 1934-05-08 Franklin S Smith High voltage terminal construction
US3459881A (en) * 1967-11-16 1969-08-05 Westinghouse Electric Corp Protective rain shield and electric field grading apparatus for use on a high voltage insulator
US3832482A (en) * 1972-07-17 1974-08-27 Westinghouse Electric Corp Ehv rain-shield and voltage grading ring for high-voltage equipment
DE3236910A1 (en) 1982-10-06 1984-04-12 Brown, Boveri & Cie Ag, 6800 Mannheim Vibration-damped corona ring
JPS63118223U (en) * 1987-01-27 1988-07-30
US6265669B1 (en) * 1996-08-12 2001-07-24 Clyde N. Richards Semiconductive attachment disc for insulators to reduce electrical stress-induced corrosion
EP2711939A1 (en) * 2012-09-21 2014-03-26 Siemens Aktiengesellschaft Line arrester

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1957985A (en) * 1931-01-26 1934-05-08 Franklin S Smith High voltage terminal construction
US3459881A (en) * 1967-11-16 1969-08-05 Westinghouse Electric Corp Protective rain shield and electric field grading apparatus for use on a high voltage insulator
US3832482A (en) * 1972-07-17 1974-08-27 Westinghouse Electric Corp Ehv rain-shield and voltage grading ring for high-voltage equipment
DE3236910A1 (en) 1982-10-06 1984-04-12 Brown, Boveri & Cie Ag, 6800 Mannheim Vibration-damped corona ring
JPS63118223U (en) * 1987-01-27 1988-07-30
US6265669B1 (en) * 1996-08-12 2001-07-24 Clyde N. Richards Semiconductive attachment disc for insulators to reduce electrical stress-induced corrosion
EP2711939A1 (en) * 2012-09-21 2014-03-26 Siemens Aktiengesellschaft Line arrester

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020052965A1 (en) * 2018-09-13 2020-03-19 Siemens Aktiengesellschaft Corona ring for a high-voltage apparatus

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