WO2015032671A1 - Dispositif de protection contre les surtensions à isolation gazeuse - Google Patents

Dispositif de protection contre les surtensions à isolation gazeuse Download PDF

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Publication number
WO2015032671A1
WO2015032671A1 PCT/EP2014/068167 EP2014068167W WO2015032671A1 WO 2015032671 A1 WO2015032671 A1 WO 2015032671A1 EP 2014068167 W EP2014068167 W EP 2014068167W WO 2015032671 A1 WO2015032671 A1 WO 2015032671A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
cylinder axis
pressure plate
surge arrester
shoulder
Prior art date
Application number
PCT/EP2014/068167
Other languages
German (de)
English (en)
Inventor
Markus Sulitze
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2015032671A1 publication Critical patent/WO2015032671A1/fr

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Classifications

    • 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
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T4/00—Overvoltage arresters using spark gaps
    • H01T4/04—Housings

Definitions

  • Gas-insulated surge arresters are protective systems, for example for high-voltage or medium-voltage switchgear, which discharge surges to ground in the event of overvoltage due to lightning or malfunctions of other subsystems and thus protect other components of the switchgear.
  • Such a surge arrester comprises one or more active parts with cylindrical discharge elements which have a varistor column constructed from individual, likewise cylindrical varistor elements, which extends along the cylinder axis.
  • Varistor elements are characterized by a voltage-dependent resistance. At low voltages these act as insulators. From a certain threshold voltage, which is material-dependent, they show a good conductivity.
  • varistor elements are made of metal oxides such as zinc oxide. The diverter is limited at both ends by end fittings that make electrical contact with the switchgear and ground. To ensure a good electrical contact even under mechanical stress, the varistor column must be held together under pressure. This can be done by tension members, for example, ropes or rods are preferably clamped in glass fiber reinforced plastic in the end fittings under train. The tension elements surround the
  • Varistor column and form a cage around this.
  • surge arresters For use in gas-insulated switchgear, surge arresters have a fluid-tight housing which surrounds the discharge element.
  • the housing is filled to increase the dielectric strength with a fluid, usually Schweielhexa- fluoride.
  • the housing is usually made of metal and is electrically grounded.
  • An end fitting of the delivery column is grounded via a contact made through the housing.
  • the another end fitting is electrically connected via a housing feedthrough with a located on the outside of the housing high-voltage contact, which serves to connect to the switchgear.
  • the tension elements are previously bolted in the end fittings.
  • the ends of the tension elements usually rods made of glass fiber reinforced plastic, have a thread for this purpose, which is inserted into an opening of the end fitting.
  • a threaded bushing is inserted into the opening and screwed onto the thread of the tension element.
  • the tension element is thereby tensioned.
  • the end fitting is usually made of metal and holds together with the tension elements screwed therein the active part, at the same time it serves for the electrical connection of the active part to a housing leadthrough.
  • the heads of the threaded bushings must be relatively large, since they have to transmit considerable torque.
  • WO 2012/168112 A1 shows a gas-insulated surge arrester, in which the tension elements are screwed into the end fittings.
  • the end fittings are solid and have a radial extent that significantly exceeds that of the discharge element.
  • DE 10 2008 048 840 AI shows a Freiluftabieiter, in which the tension elements are braced in massive end fittings with wedges.
  • WO 2011/000684 Al a method for pressing the end fittings with the tension elements is described.
  • the object of the invention is to provide a surge arrester which is compact and easy to assemble.
  • an overvoltage arrester with a fluid-tight housing in which an active part is arranged, is provided for this purpose.
  • the active part has a cylindrical discharge element extending along a cylinder axis between a ground connection side and a high-voltage connection side, a plurality of tension elements arranged radially around the discharge element made of an electrically insulating material, for example glass-fiber reinforced plastic, and two end fittings arranged at the ends of the discharge element the tension elements under train directly, so without additional fasteners are braced.
  • each of the end fittings has for this purpose an annular retaining element.
  • the cross-section of the support member is substantially L-shaped, with a shoulder extending radially inwardly of the cylinder axis and a leg extending parallel to the cylinder axis, with the legs of the two end fittings facing each other. The tension elements are clamped in the legs.
  • each end fitting has an inserted into the annular support member between the shoulder and the discharge element contact arrangement with a pressure plate, a contact plate and a spring element arranged between them.
  • the contact arrangement is inserted into the annular holding element in such a way that the shoulder rests on the pressure plate. plate supports.
  • the holding element in this case has a purely mechanical function, it can be made of any material, but will usually consist of a tensile metal such as steel. But it is also conceivable to produce the retaining element of a different material such as glass fiber reinforced plastic.
  • the contact arrangement serves to transmit the tensile force of the tension elements to the diverting element, and on the other hand, to electrically connect the diverting element to an earth contact, or a high-voltage contact.
  • All components of the end fittings can be designed rotationally symmetrical, since no forces must be transferred to the discharge element.
  • Such an end fitting is particularly compact to build both in the radial direction, as well as in the axial direction and easy to assemble.
  • the pressure plate has a centering pin extending along the cylinder axis, which penetrates through an opening in the spring element into a centering opening in the contact plate.
  • a centering of the components of the contact arrangement is achieved and facilitates the assembly.
  • the contact plate has an extending through an annular opening of the holding element approach with a bore into which a feedthrough bolt a ground-side implementation or a contact of a high-voltage side separation device can be inserted.
  • the bore is arranged coaxially with the cylinder axis.
  • the bore has an internal thread and the feedthrough bolt on an external thread and pressure plate and bushing bolts are bolted together.
  • an advantageous embodiment of the invention that is arranged around the contact arrangement of the high-voltage terminal side a shield cap which is electrically connected via a extending through the annular opening spring contact with the pressure plate, wherein the shield hood is pressed by the spring contact against a high voltage contact.
  • the active part is pressed against the high-voltage contact and thus fixed its longitudinal axis and at the same time an electrical contact is made to the high-voltage contact.
  • the active part through the
  • Shield cover fixed radially. This avoids having to handle the inside of the housing, which is difficult to access during installation.
  • Umbrella hood has a connection pin extending along the cylinder axis, which can be inserted into a corresponding contact bore of a high-voltage contact of a high-voltage leadthrough.
  • the active part is thereby centered and fixed against radial deflection.
  • FIG. 2 shows a detailed representation of a detail from FIG.
  • FIG. 3 shows an alternative embodiment of a surge arrester according to the invention
  • FIG. 4 shows a detailed representation of a further detail from FIG. 1.
  • FIG. 1 shows an overvoltage arrester 1 according to the invention.
  • An encapsulated fluid-tight housing 40 has a tubular housing wall 41 with flanges 42 at the tube ends. On the flanges 42 are on a high voltage terminal side 30, a high-voltage bushing 44 and at the
  • the housing 40 consists essentially of an electrically conductive material such as steel or aluminum and is grounded during operation.
  • the lid 43 is a simple plate of metal, for example, and may have a pressure relief port 45 which is closed with a rupture disk or membrane, not shown.
  • the cover 43 has an opening for a ground-side lead-through 21 for each active part 2 arranged in the housing 40.
  • the high-voltage bushing 44 consists of a frame 47 with an insulating part 46 made of an electrically insulating material such as cast resin, in which a high-voltage contact 24 is used for each of the active parts 2 arranged in the housing 40.
  • each active part 2 has a cylindrical discharge element 20 extending along a cylinder axis 26.
  • the diverting element 20 is usually formed as a stack of cylindrical varistor elements with a voltage-dependent resistor. At the ends of the discharge Elements 20 each have an end fitting 3, 4 is arranged.
  • Tensile elements 13, for example made of glass fiber reinforced plastic surround the diverting element 20 parallel to the cylinder axis
  • the tension elements 26 serve to press the varistor elements together to produce a good electrical contact between them and hold the stack together. They also serve the stack against slipping
  • the end fitting 3 is attached directly to a feedthrough pin 23 or preferably screwed.
  • the feedthrough pin 23 represents the earth contact.
  • the electrical contact is made to the outside of the housing 40, which is connected in operation to the ground.
  • the end fitting 4 here comprises an annular retaining element 5 with an L-shaped cross-section with a shoulder 26 which extends radially inward to the cylinder axis 26 and a leg 7 which extends parallel to the cylinder axis 26.
  • the leg 7 points in the direction of the discharge element 20 and in the direction of the opposite end fitting 3.
  • the ring opening 19 has a diameter which corresponds to that of the discharge element 20 and, in the region of the shoulder 6, a diameter reduced in diameter on.
  • Through the leg 7 through holes 26 are arranged parallel to the cylinder axis, in which tension elements 13 are received and pressed, for example, are crimped.
  • the tension elements 13 are inserted into the holes, biased and the Halteelemement 5 plastically deformed in a press so that the tension elements 13 are firmly connected to the holding element 5.
  • a contact arrangement 8 consisting of a pressure plate 9, a contact plate 10 and a spring element 11 arranged between the pressure plate 9 and the contact plate 10, here embodied as a telescopic spring, is arranged within the ring opening 19 in the region of the leg 7.
  • an insert plates 15 can still be inserted.
  • the bias of the tension elements 13 exerts a force on the holding element 5, which is supported with its shoulder 6 on the pressure plate 9.
  • the end fitting 3 on the ground terminal side 31 is constructed equivalently. Such an end fitting 3, 4 is built very compact. It protrudes radially beyond the diversion element 20 by only about twice the diameter of the tension element 13. In addition, it can be manufactured from low-cost turned parts, since all components are rotationally symmetrical.
  • the contact arrangement 8 ensures a uniform distribution of force on the end face of the discharge element 20.
  • the pressure plate 9 in its center a in
  • a hood-like shield cap 27 is arranged to the end fitting 4 on the high voltage terminal side. This shields the end fitting 4, in particular its corners and edges, against the high voltage.
  • a spring contact 18 is arranged in the form of a helical spring. The spring contact 18 extends thereby through the ring opening 19 in the region of the shoulder 6 through the holding element 5 therethrough. It electrically connects the pressure plate 9 with the shielding cap 27 and presses the shielding cap 27 against a high-voltage contact 24 of the high-voltage feedthrough 44. This produces a continuous electrical connection from the outside of the housing 40 to the diverting element 20.
  • a cylindrical wall of the umbrella hood 27 extending in the direction of the cylinder axis 26 guides the retaining element 5 in the radial direction, ie perpendicular to the cylinder axis 26.
  • FIG. 3 shows an alternative embodiment.
  • a shield cap 27 is arranged around the end fitting 4, which rests, however, not directly on the holding element 5 via a spring element.
  • the connection to the high voltage contact 24 is here via a removable separator
  • the separating device 32 has a cylindrical housing body 34 and two mutually movable contacts 33, 35.
  • the contact 33 is fixed to the
  • Housing body 34 is connected, a movable contact 35 is hineind Wegbar in the housing body 35 against a spring 36.
  • the length of the separator 32 can be shortened by the impressions of the movable contact 35.
  • the movable contact 35 is pressed by the spring 36 to the high voltage contact 24.
  • a recess in the high voltage contact 24 centers the movable contact 35.
  • the separator 32 can be easily removed, for example, through a manhole in the housing 40 and replaced. This is advantageous in tests of the switchgear in which the surge arrester 1 is installed, since the active part 2 can thus be easily separated from the switchgear.
  • FIG. 4 shows the construction of the end fitting 3 on the ground connection side 31.
  • Retaining element 5 and the contact arrangement 8 Pressure plate 9, contact plate 10 and spring element 11 are constructed here as in FIG. 3, but without a shield cap 27 surrounding the end fitting 3, which is not necessary on the ground connection side 31 because of the low field strengths.
  • the projection 12 of the pressure plate 9 has here as well as in the figure 2, a bore 16 which is coaxial with the cylinder axis 26. This bore 26 has an internal thread which is screwed onto a corresponding external thread of a bushing bolt 23.
  • the bushing pin 23 is the electrically conductive part of the ground-side housing bushing 21, which also has two electrically insulating feedthrough bushings 22, one of which is disposed inside, the other outside of the housing 40. Through a central opening through both bushings 22 of the bushing pin 23 is inserted, which produces an electrically conductive connection, which is electrically insulated from the housing 40 from inside to outside of the housing 40.
  • the two bushings 22 have tubular approaches with different diameters, which lead through a passage opening in the lid 23 and are inserted into each other.
  • the bushing bolt 23 has on its lying outside of the housing 40 side a stop which is supported on the outer bushing 22.
  • An anti-twist device 25 prevents co-rotation of the feedthrough bolt 23 when the active part 2 is screwed onto the inside of the housing 40 on the feedthrough bolt 23.
  • the projection 12 of the pressure plate 9 is supported on the inner bushing sleeve 22.
  • the bushings 22 are inserted from both sides into the passage opening of the lid 43. From the outside of the bushing pin 23 is inserted and with the
  • the preassembled active part 2 is now screwed with the bore 16 on the bushing bolt 23.
  • he has key surfaces 17 for a tool, such as an open-end wrench on. Apart from the key surfaces 17, all components of the end fitting 3 rotationally symmetrical.
  • the active part 2 is now connected via the housing feedthrough 21 fixed to the lid 43.
  • the lid 23 can now be placed on the housing 40.
  • the active part 2 is centered on the high voltage contact 24 via the terminal bolt 28 or the movable contact 35.

Abstract

L'invention concerne un dispositif de protection contre les surtensions (1) pourvu d'un boîtier (40) étanche au fluide dans lequel une partie active (2) est disposée. La partie active (2) comprend un élément de déviation cylindrique (2) s'étendant le long d'un axe de cylindre (26) entre un côté de raccordement à la terre (31) et un côté de raccordement haute tension (30) et plusieurs éléments de tension (13) disposés radialement autour de l'élément de déviation (2) et mis en tension dans deux garnitures terminales (3, 4) disposées aux extrémités de l'élément de déviation (2). Chaque garniture terminale (3, 4) comprend un élément de support annulaire (5) pourvu d'un épaulement (6), lequel s'étend radialement vers l'intérieur par rapport à l'axe de cylindre (26) et d'une branche (7), laquelle s'étend parallèlement à l'axe de cylindre (26), les branches (26) des deux garnitures terminales (3, 4) étant tournées l'une vers l'autre, et les éléments de tension (13) étant montés dans les branches (7), et un ensemble de contact (8) inséré dans l'élément de support annulaire (5) entre l'épaulement (6) et l'élément de déviation (2), et pourvu d'une plaque de pression (9), d'une plaque de contact (10) et d'un élément ressort (11) disposé entre ces derniers, l'épaulement (6) étant en appui sur la plaque de pression (9).
PCT/EP2014/068167 2013-09-09 2014-08-27 Dispositif de protection contre les surtensions à isolation gazeuse WO2015032671A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20130183563 EP2846333A1 (fr) 2013-09-09 2013-09-09 Paratonnerre isolé du gaz
EP13183563.9 2013-09-09

Publications (1)

Publication Number Publication Date
WO2015032671A1 true WO2015032671A1 (fr) 2015-03-12

Family

ID=49123748

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/068167 WO2015032671A1 (fr) 2013-09-09 2014-08-27 Dispositif de protection contre les surtensions à isolation gazeuse

Country Status (2)

Country Link
EP (1) EP2846333A1 (fr)
WO (1) WO2015032671A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3082136B1 (fr) 2015-04-14 2017-11-01 Siemens Aktiengesellschaft Paratonnerre à isolation gazeuse
MX2021010821A (es) 2019-03-07 2022-01-18 Arris Entpr Llc Dispositivo y método para lanzar ondas magnéticas transversales.
DE102020212640A1 (de) 2020-10-07 2022-04-07 Siemens Energy Global GmbH & Co. KG Leiteranordnung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4905118A (en) * 1988-03-31 1990-02-27 Hubbell Incorporated Base mounted electrical assembly
GB2258352A (en) * 1991-08-02 1993-02-03 Ngk Insulators Ltd Overvoltage arrester
WO2000055869A1 (fr) * 1999-03-17 2000-09-21 Siemens Aktiengesellschaft Coupe-circuit de surtension dote d'un element de traction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008048840A1 (de) 2007-10-12 2009-04-16 Tridelta Überspannungsableiter Gmbh Überspannungsableiter mit Käfig-Design
DE102009031571A1 (de) 2009-06-30 2011-01-20 Siemens Aktiengesellschaft Endarmatur eines elektrischen Bauteils und Verfahren zum Verpressen einer Endarmatur
DE102011077394A1 (de) 2011-06-10 2012-12-13 Siemens Aktiengesellschaft Überspannungsableiter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4905118A (en) * 1988-03-31 1990-02-27 Hubbell Incorporated Base mounted electrical assembly
GB2258352A (en) * 1991-08-02 1993-02-03 Ngk Insulators Ltd Overvoltage arrester
WO2000055869A1 (fr) * 1999-03-17 2000-09-21 Siemens Aktiengesellschaft Coupe-circuit de surtension dote d'un element de traction

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Publication number Publication date
EP2846333A1 (fr) 2015-03-11

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