EP2998970A1 - Limiteur du surtension - Google Patents
Limiteur du surtension Download PDFInfo
- Publication number
- EP2998970A1 EP2998970A1 EP14185789.6A EP14185789A EP2998970A1 EP 2998970 A1 EP2998970 A1 EP 2998970A1 EP 14185789 A EP14185789 A EP 14185789A EP 2998970 A1 EP2998970 A1 EP 2998970A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- surge arrester
- tensioning
- active part
- column
- loops
- 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
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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
Definitions
- Surge arresters are protective systems, for example for power transmission networks, which in case of overvoltages caused by lightning strikes or malfunctions of other subsystems dissipate these overvoltages to ground and thus protect other components of the power transmission system.
- Such a surge arrester comprises one or more cylindrical Ableit yarnlen of individual also cylindrical Varistorblöcken.
- Varistors are characterized by a voltage-dependent resistor. At low voltages these act as insulators. From a certain threshold voltage, which is material-dependent, they show a good conductivity. Frequently, varistors are made from metal oxides such as zinc oxide. The discharge column is connected at both ends with end fittings, which establish the electrical contact to the power line and to ground. In order to ensure a good electrical contact between the varistors, even under mechanical stress, the Ableit yarn must be held together by an axial contact force.
- the object of the invention is to provide a surge arrester, which is easy to assemble and allows a few variants a large variety of variants. Another object is to provide a most efficient method for mounting a surge arrester.
- a surge arrester has a preassembled active part having a discharge column, which is in a rigid, is arranged along a longitudinal axis extending tubular housing.
- the longitudinal axis defines an axial direction.
- the rejection column is preferably constructed of a plurality of cylindrical varistor blocks stacked in a column along the longitudinal axis.
- the active part is clamped between two flanges closing the housing on the front side.
- the preassembled active part has an upper and a lower retaining plate, one of which rests on the upper and one on the lower end side of the Ableitklale.
- Each holding plate has at least two, preferably four, cams which preferably extend parallel to the longitudinal axis from a side of the holding plate facing away from the delivery column.
- the delivery column is held together axially by at least two elastic tensioning loops and is radially supported by tensioning each tensioning loop between a cam of the upper holding plate and a corresponding cam of the lower holding plate.
- the pre-assembled active part thus consists of the delivery column, the holding plates and the tension loops. Such a pre-assembled active part is sufficiently stable for the purpose of assembly. The necessary contact force is not applied by the tension loops. This is achieved only by the bracing between the flanges. The straps can be easily stretched by hand. The assembly is considerably simplified.
- the radially closest to the longitudinal axis point of a cam defines a deflection point for the tensioning loops.
- the retaining plate includes first segments S 1 with a radius R 1 and second segments S 2 with a radius R 2, where the Ableit yarn has a radius R A and wherein R 2 ⁇ R A ⁇ R 1, and wherein the deflection point a distance R u ⁇ R 2 from the longitudinal axis. All radii are in a plane perpendicular to the longitudinal axis measure up.
- the circumferential line of the holding plate thus has segments with different radii, preferably per clamping loop, a segment S 1 with a larger radius R 1 and a segment S 2 with radius R 2 .
- the rejection column can assume radii R A between R 1 and R 2 .
- the segments S 1 serve to support the holding plate as wide as possible on the delivery column.
- the deflection point set back relative to the outer contour in the direction of the longitudinal axis, which also forms the central axis, ensures that the tensioning loops extend at least partially in the radial direction at their ends. If they are stretched, a radial force component acts there, which additionally stabilizes the deflection column.
- each tensioning loop runs from the deflection point through a second segment S 2 to the shell side of the delivery column.
- the same retaining plate for Ableit yarn with diameters of R 2 to R 1 are used, which reduces the stock to be held variant variety of retaining plate
- the clamping loops are then axially along the shell side of the Ableit yarn, and are at the transition of the shell side to the front of Ableit yarn deflected toward the cams out at least partially extending in the radial direction, which the Ableit yarn when the tensioning loops are stretched, again radially supports.
- the Ablesit yarn at their end faces in each case an end plate with at least one rounded edge, wherein the tensioning loops extend over the rounded edge.
- the end plates are circular cylindrical plates of a few millimeters in thickness and a diameter corresponding to that of the varistor blocks used, made of an electrically conductive material such as steel or aluminum, in which the circular edge is rounded at the transition from shell side to the front side.
- the radius of curvature is preferably at least 0.5 mm and may be up to half the thickness of the end plate.
- the end plate distributes the pressure which the holding plates exert on the delivery column evenly over the mostly very brittle varistor blocks, on the other hand
- the rounded edges protect the clamping loops, which do not run over the mostly sharp edge of the varistors.
- the tension loops preferably have a volume resistance and a surface resistance of at least 10 6 ohms, preferably at least 10 9 ohms. This ensures that below the threshold voltage no significant currents flow through the tensioning loops.
- clamping loops on a circular cross-section are available in many lengths and easy to handle.
- the tensioning loops made of an elastomer, preferably made of natural or synthetic rubber, such as silicone.
- an elastomer preferably made of natural or synthetic rubber, such as silicone.
- this offers the best elastic properties for the present application; on the other hand, such tensioning loops, for example as commercially available O-rings, are particularly readily available and cost-effective.
- At least one of the holding plate has a centering pin which can be inserted into a centering device on the flange.
- a centering device on the flange for example, a centering plate with a corresponding bore or a spiral spring can serve with a corresponding central opening.
- an active part is first preassembled in this method for mounting a surge arrester.
- a discharge column extending along a longitudinal axis is arranged with its end faces between an upper and a lower holding plate.
- At least two straps are each stretched between a cam of the upper holding plate and a corresponding cam of the lower holding plate and thus hold the active part axially, ie in the direction of the longitudinal axis, together and support it radially.
- the thus pre-assembled active part is introduced into a rigid tubular housing in the direction of the longitudinal axis and compressed therein by an external acting on the retaining plate pressing device for generating an axial contact force.
- the active part is locked in the compressed position by means of a locking device in the housing. The opposing force acting against the contact force is thus absorbed by the housing.
- FIG. 1 shows a section through a surge arrester according to the invention 1. Visible from the outside are the rigid housing 2 with a rigid, along a longitudinal axis 40 extending tube 3, for example made of glass fiber reinforced plastic, and molded onto this silicone coating with umbrellas 4. Alternatively, the housing be made of ceramic together with the umbrellas 4. At its end faces the housing 2 with two flanges 5, 6 is hermetically sealed. These are the flanges 5, 6 with the rigid Glued tube 3.
- the flange 5 at the upper end of the housing 2 has a connection, not shown, to a high voltage line. It can also have an arc electrode 21.
- the flange 6 at the lower end of the housing 2 has a connection, not shown, to a grounding point.
- it has, here in the form of a blow-out bar 22, a pressure relief device, via which in the event of a fault in the interior of the housing 2 emerging gas can be directed directed outwards.
- the active part 20 is arranged.
- FIG. 2 shows the structure of the surge arrester 1 in the region of the upper, ie the high-voltage side flange 5.
- the flange 5 abuts with an outer shell side on an inner shell side of the rigid tube 3 and is glued there with this.
- a cover plate 23 closes off a cavity in which, for example, desiccant can be accommodated.
- a spring 18, designed here as a spiral spring is arranged between the cover plate 23 and the active part 20, a spring 18, designed here as a spiral spring, is arranged. About this, the contact force is transmitted from the housing 2 to the active part 20. At least the outermost turn of the spring 18 is supported on the cover plate 23 at a shoulder of the flange 5 from.
- the opening in the center of the spring 18 is dimensioned such that a centering pin 17 of a retaining plate 8 can immerse therein and is centered.
- the active part 20 is constructed at its upper, ie the high-voltage side and at its lower, as the earth-side end similar.
- the active part 20 has a discharge column 7, which is composed of cylindrical blocks 25. At its end faces, the discharge column 7 may be delimited by electrically conductive end plates 11, for example made of steel, copper or aluminum.
- On the upper end faces of the discharge column 7 is an upper retaining plate 8, on the lower a lower retaining plate 9.
- Upper and lower retaining plate 8, 9 may be designed similar and are also electrically conductive.
- the holding plates can be made of steel, copper or aluminum.
- the holding plates each have a plurality, ie at least two, cams 16. These cams 16 each extend from an end facing away from the Ableitkla 7 end face of the retaining plate 8, 9 parallel to the longitudinal axis 40. To each cam 16, one end of an elastic tensioning loop 10 is placed. The other end of the tensioning loop 10 is stretched around a corresponding cam 16 of the lower holding plate 9.
- the tensioning loops 10 extend essentially radially parallel to the front side of the diverter column 7 on the retaining plate 8 and are deflected in the axial direction in the region of the edge of the diverter column 7 and then run along the shell side of the diverter column 7.
- the elasticity of the tensioning loop 10 is chosen to be that this is at least partially applied to the jacket side of the delivery column 7. If the tensioning loops 10 are tensioned, they thus support the delivery column 7 radially.
- FIG. 3 shows the structure of the surge arrester 1 in the region of the lower, ie the ground-side flange 6.
- the flange 6 is here with an inner shell side on an outer shell side of the tube 3 and is glued there with this.
- a pressure plate 12 presses the active part 20 against the upper flange 5.
- a sealing ring 13 and seals 15 seal together with a non-visible membrane, which is arranged between pressure plate 12 and sealing ring 13, the arrangement against the flange 6 from.
- the membrane is designed such that it ruptures at an increase in pressure inside the housing and releases the excess pressure through the flange 6 and the Ausblasschute 22 to the outside.
- a locking ring 14 secures the assembly prior to removal of the pressing device so that the contact force exerted on the active part 20 is maintained.
- the locking ring can be screwed to the flange 6, for example, or be connected by a bayonet lock with the flange 6.
- the pressure plate 12 has openings through which gas can escape more easily at an overpressure.
- it has a center hole 24 into which an am Active part 20 arranged centering pin 17 can dip to center the active part 20.
- the FIG. 4 shows an embodiment of a preassembled active part 20 of a surge arrester 1 according to the invention.
- the active part 20 has a discharge column 7, which is composed of a column of a plurality of cylindrical Varistorblöcken 25. End plates 11, which preferably have rounded edges 26, can be arranged on the end faces of the diverter column 7.
- the Ableit yarn 7 is clamped between two arranged at their end faces holding plates 8, 9 by means of clamping loops 10.
- the tensioning loops 10 are made of an elastic material such as natural or synthetic rubber, silicone or other elastomers. Two or more tensioning loops 10 are placed around cams 16 on each of the two retaining plates 8 and clamp the Ablesit yarn 7 a.
- the clamping force of the tensioning loops 10 is dimensioned such that the tensioning loops can be manually attached by a person. This clamping force is sufficient to hold the active part 20 together for the purpose of assembly, but the necessary contact force is not applied by the tensioning loops 10. This is applied and obtained as described above by means of the pressing device.
- the tensioning loops 10 are annular and preferably have a round cross section so that commercially available O-rings can be used as tensioning loops 10.
- the material should have both a volume resistivity and a surface resistance of at least 10 6 ohms, preferably at least 10 9 ohms. In addition, it should retain its elastic properties in a temperature range of -50 ° C to +100 ° C.
- FIG. 5 shows a plan view of another embodiment of the active part 20.
- the visible holding plate 8 structurally simpler designed than in the FIGS. 1 to 4 to make the essential details clearer.
- the FIG. 6 shows a corresponding partial section.
- the upper retaining plate 8 is designed substantially cylindrical.
- the lower holding plate 9, not shown, is designed to this similar.
- the holding plate 8 has, along its circumference, segments S 1 with a radius R 1 and segments S 2 with a radius R 2 .
- the segments S 1 and S 2 alternate in the circumferential direction and are distributed uniformly over the circumference.
- the segments S 1 extend over a significantly smaller angular range than the segments S 2 .
- this can also be the other way round.
- each tensioning loop 10 there is in each case a segment S 1 and a segment S 2 .
- the nose-like protuberances 29 in the segments S 1 support the Ablesit yarn 7 at the end face over its entire diameter.
- the radius R 1 thus determines the preferably to be used largest radius R A of the Ableit yarn 7. Although it could be used with larger radius Ableit yarnlen 7, but these are then no longer supported on the front side over its entire diameter.
- the smallest radius R A of the delivery column 7 to be used is determined by the radius R 2 of the segments S 2 .
- the segments S 2 are shown in the present embodiment as indentations 30 of the circumferential line.
- the radius R 2 is smaller than in the segment S 1 , so R 2 ⁇ R 1 .
- the deflection point 19 for the tensioning loop 10, that is the respective next longitudinal axis 40 point of a cam 16 is set back relative to the outer contour of the segment S 2 , that is closer to the longitudinal axis 40, and thus has a distance R U ⁇ R 2 from the longitudinal axis.
- Around the cams 16 around the clamping loops 10 extend semicircular in a groove 27 and are guided substantially radially to the longitudinal axis 40 by a segment S 2 to the outside. At the edge of the discharge column 7, it is guided in the direction of the lower holding plate 9. It runs in the axial direction parallel to the longitudinal axis 40 along the lateral surface of the Ableitkla 7.
- tensioning loops 10 are used as in the embodiments shown. It would also be conceivable to use only three tensioning loops 10. The three cams 16 would then lie on the corners of an equilateral triangle about the longitudinal axis 40. Alternatively, a design with only two tensioning loops 10 is conceivable by a tensioning loop is placed around two cams 16, as in FIGS. 5 and 6 indicated by dashed lines, which represent an alternative groove 28. In a further alternative embodiment, the cams 16, around which a tensioning loop 10 extends, can be combined to form, for example, a lenticular cam 16.
- the active part 20 is pre-assembled by stacking a required number of varistor blocks 25 into a column.
- length compensation elements can be inserted into the column to bring the Ableit yarn to a housing 2 corresponding length.
- Such compensation elements have the same diameter as the varistor blocks 25 and are made of a highly electrically conductive material.
- At the end faces of the column end plates 11 are arranged.
- the length compensation can alternatively be done by different thicknesses or more end plates 11.
- At least two elastic clamping loops 10 are now stretched between a cam 16 of the upper holding plate 8 and a corresponding cam 16 of the lower holding plate 9. As a result, the active part 20 is held together axially and radially supported.
- the housing 2 is placed upside down, so with the upper flange 5 down on a support and the cover plate 23 and the spring 18 inserted.
- the preassembled active part 20 is inserted into the housing 2.
- the centering pin 17 is inserted into a central opening of the spring 18.
- the pressure plate 12 is placed on the lower holding plate 9, wherein the centering pin 17 dips into a center hole 24 of the pressure plate 12.
- the seal 15 is inserted and placed the membrane on the pressure plate and the sealing ring 13 in turn on the membrane. Now an axial force is exerted on the pressure plate 12 with an external pressing device, not shown, and the active part 20 is pressed together until the required contact force acts on the varistor blocks 25.
- the arrangement is now locked in the housing 2 with a locking device 14, for example a locking ring.
- a locking device 14 for example a locking ring.
- the pressing device can now be removed.
- the active part 20 is now clamped between the upper flange 5 and the lower flange 6 in the housing 2.
- the clamping force is transmitted between the flanges 5, 6 through the rigid tube 3.
- the Ausblasschute 22 still has to be attached to the outside of the lower flange 6, then the surge arrester 1 is fully assembled.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14185789.6A EP2998970B1 (fr) | 2014-09-22 | 2014-09-22 | Limiteur du surtension |
CN201580050690.4A CN106688055B (zh) | 2014-09-22 | 2015-09-14 | 过电压防护放电器 |
PCT/EP2015/070913 WO2016045997A1 (fr) | 2014-09-22 | 2015-09-14 | Limiteur de surtension |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14185789.6A EP2998970B1 (fr) | 2014-09-22 | 2014-09-22 | Limiteur du surtension |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2998970A1 true EP2998970A1 (fr) | 2016-03-23 |
EP2998970B1 EP2998970B1 (fr) | 2017-08-02 |
Family
ID=51570427
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14185789.6A Not-in-force EP2998970B1 (fr) | 2014-09-22 | 2014-09-22 | Limiteur du surtension |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2998970B1 (fr) |
CN (1) | CN106688055B (fr) |
WO (1) | WO2016045997A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020057915A1 (fr) | 2018-09-17 | 2020-03-26 | Siemens Aktiengesellschaft | Dispositif de protection contre les surtensions doté d'un dispositif de libération de pression et procédé de fabrication d'un dispositif de protection contre les surtensions |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113299445A (zh) * | 2021-05-28 | 2021-08-24 | 固力发电气有限公司 | 一种高压复合支柱绝缘子 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4656555A (en) * | 1984-12-14 | 1987-04-07 | Harvey Hubbell Incorporated | Filament wrapped electrical assemblies and method of making same |
US4851955A (en) * | 1986-01-29 | 1989-07-25 | Bowthorpe Emp Limited | Electrical surge arrester/diverter having a heat shrink material outer housing |
WO1996007186A1 (fr) * | 1994-08-29 | 1996-03-07 | Asea Brown Boveri Ab | Limiteur de surtension |
EP0614198B1 (fr) | 1993-03-04 | 1997-01-15 | ABB Management AG | Parafoudre |
WO2012098250A1 (fr) * | 2011-01-21 | 2012-07-26 | Tridelta Überspannungsableiter Gmbh | Limiteur de tension à configuration en cage |
EP2757565A1 (fr) | 2013-01-18 | 2014-07-23 | Siemens Aktiengesellschaft | Flasque pour boîtier rigide pour l'isolation électrique d'un composant électrique |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SI0642141T1 (en) * | 1993-09-06 | 1997-10-31 | Asea Brown Boveri | Surge arrester |
FR2757693B1 (fr) * | 1996-12-23 | 1999-02-19 | Sediver | Parafoudre avec une enveloppe ayant une surface exterieure gaufree |
CN2307340Y (zh) * | 1997-04-29 | 1999-02-10 | 水利部电力工业部机电研究所 | 一种有机外壳避雷器 |
DE10020129C1 (de) * | 2000-04-14 | 2001-11-15 | Siemens Ag | Baugruppe mit Überspannungsableiter für eine Hochspannungsanlage |
CN201289770Y (zh) * | 2008-12-30 | 2009-08-12 | 山东泰开互感器有限公司 | 硅橡胶复合外套交流无间隙金属氧化物避雷器 |
DE102011088072A1 (de) * | 2011-12-09 | 2013-06-13 | Siemens Aktiengesellschaft | Überspannungsableiter |
CN103000323B (zh) * | 2012-12-05 | 2015-09-30 | 中国西电电气股份有限公司 | 超高压复合外套避雷器端部一次封胶方法 |
CN203521081U (zh) * | 2013-10-10 | 2014-04-02 | 广东吉熙安电缆附件有限公司 | 一种内锥插拔式避雷器 |
-
2014
- 2014-09-22 EP EP14185789.6A patent/EP2998970B1/fr not_active Not-in-force
-
2015
- 2015-09-14 WO PCT/EP2015/070913 patent/WO2016045997A1/fr active Application Filing
- 2015-09-14 CN CN201580050690.4A patent/CN106688055B/zh not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4656555A (en) * | 1984-12-14 | 1987-04-07 | Harvey Hubbell Incorporated | Filament wrapped electrical assemblies and method of making same |
US4851955A (en) * | 1986-01-29 | 1989-07-25 | Bowthorpe Emp Limited | Electrical surge arrester/diverter having a heat shrink material outer housing |
EP0614198B1 (fr) | 1993-03-04 | 1997-01-15 | ABB Management AG | Parafoudre |
WO1996007186A1 (fr) * | 1994-08-29 | 1996-03-07 | Asea Brown Boveri Ab | Limiteur de surtension |
WO2012098250A1 (fr) * | 2011-01-21 | 2012-07-26 | Tridelta Überspannungsableiter Gmbh | Limiteur de tension à configuration en cage |
EP2757565A1 (fr) | 2013-01-18 | 2014-07-23 | Siemens Aktiengesellschaft | Flasque pour boîtier rigide pour l'isolation électrique d'un composant électrique |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020057915A1 (fr) | 2018-09-17 | 2020-03-26 | Siemens Aktiengesellschaft | Dispositif de protection contre les surtensions doté d'un dispositif de libération de pression et procédé de fabrication d'un dispositif de protection contre les surtensions |
Also Published As
Publication number | Publication date |
---|---|
WO2016045997A1 (fr) | 2016-03-31 |
CN106688055A (zh) | 2017-05-17 |
CN106688055B (zh) | 2019-05-03 |
EP2998970B1 (fr) | 2017-08-02 |
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