EP2976773A1 - Encapsulated surge arrester - Google Patents
Encapsulated surge arresterInfo
- Publication number
- EP2976773A1 EP2976773A1 EP13721317.9A EP13721317A EP2976773A1 EP 2976773 A1 EP2976773 A1 EP 2976773A1 EP 13721317 A EP13721317 A EP 13721317A EP 2976773 A1 EP2976773 A1 EP 2976773A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- columns
- housing
- stacks
- column
- active part
- 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.)
- Withdrawn
Links
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
- the invention relates to an overvoltage arrester encapsulated by a fluid-tight housing in accordance with the preamble of patent claim 1.
- Overvoltage arresters are protective systems, for example, for switchgear, which occur in the event of overvoltages
- Such a surge arrester comprises one or more active parts which have a varistor column constructed from individual cylindrical varistor elements.
- 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. Frequently, 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, a pipe, ropes or rods are preferably clamped in glass fiber reinforced plastic in the end fittings under train. The tension elements surround the varistor column.
- overvoltage arresters For use in gas-insulated switchgear, overvoltage arresters have an encapsulated, fluid-tight housing which surrounds the arrester element.
- the housing is filled to increase the dielectric strength with a fluid, usually sulfur hexafluoride.
- the housing is made of a conductive material such as a metal and is electrically grounded.
- An end fitting of the delivery column is grounded via a contact made through the housing.
- the other end fitting is electrically connected via a passage with a contact located on the outside of the housing, which serves to connect to the switchgear.
- Such Matternapssabieiter are known for example from DE 102011077394 AI.
- a one-column active part is arranged in a fluid-tight housing.
- the active part can be up to several meters long.
- Object of the present invention is to provide a surge arrester, which is better adapted to the space conditions of a switchgear.
- the surge arrester has a fluid-tight housing with a housing wall which extends along a housing axis between a lower cover and an upper cover.
- the surge arrester has an active part arranged in the housing for dissipating an overvoltage, which comprises diverting elements arranged in stacks, wherein a plurality of stacks arranged one above the other and separated by insulating intermediate pieces form a pillar.
- the active part has a plurality of columns, the longitudinal axes of which are arranged parallel to the housing axis, wherein stacks of adjacent columns are electrically connected to one another in such a way that the current path meander-shaped through the Ak- is managed.
- connection can be made, for example, via cables or conductive strips, which are arranged on the lateral surfaces of the diverter elements, but is preferably carried out by a connecting element which is arranged between two stacks of two adjacent columns and each adjacent thereto spacers and thus electrically connects two adjacent stacks with each other ,
- the columns are arranged in a row next to one another. Compared to a surge absorber with a one-column active part of the surge arrester according to the invention is significantly shorter.
- the surge arrester according to the invention is less wide because of the row arrangement of the columns.
- Switchgear often does not have the same amount of space in all directions.
- the surge arrester according to the invention can be aligned in the switchgear so that its narrower side points in the direction in which less space is available.
- the housing wall in a section along the housing axis has an elliptical cross-sectional contour with a long axis and a short axis, wherein the row of columns is arranged along the long axis.
- An elliptical housing is optimally adapted to the row arrangement of the columns and still has a high compressive strength.
- intermediate pieces are arranged at the same height of the columns and that between the intermediate pieces and on both sides of the
- Intermediate piece adjacent stacks connecting elements are arranged, each electrically connecting a stack of a column with a stack of the adjacent column.
- two electrical connections to stacks of adjacent columns can be made for an intermediate piece.
- spacers can be saved and thereby the columns are shorter.
- an intermediate piece of a column and an intermediate piece arranged at the same height of an adjacent column are formed as ends of a one-piece support plate.
- the intermediate pieces can serve as additional mechanical connections between two adjacent columns, which improves the mechanical stability of the active part.
- an advantageous embodiment of the invention provides that the connecting elements on a top and
- FIG. 1 shows a surge arrester according to the invention in a longitudinal section
- Figure 2 shows the surge arrester of Figure 1 in a
- FIG. 1 shows a surge arrester 1 according to the invention in a longitudinal section.
- Figure 2 the same surge arrester 1 in a plan view.
- the columns 10a, 10b and 10c of the active part 6 are shown here visible through the lid 5 through.
- the surge arrester 1 has a fluid-tight, mostly made of a conductive material and electrically grounded housing 2.
- the housing 2 has a lower lid 4 and an upper lid 5. Between the covers 4, 5, a housing wall 3 extends along a Body axis 30.
- the housing is filled with an insulating fluid such as oil or sulfur hexafluoride when ready for use.
- an active part 6 is arranged, which serves to dissipate an overvoltage.
- the active part 6 is limited at a high-voltage side end 26 of an upper end fitting 20. This is electrically connected to a high-voltage contact 16, which in turn leads an electrical connection via a high-voltage bushing 25 through the upper lid 5 to the outside. Outside the housing 2 can be made with this connection to a high-voltage switchgear, not shown here.
- On an earth-side end 27 of the active part 6 this is limited by a lower end fitting 21, shown in three parts here. However, a one-piece end fitting 21 would also be possible.
- the lower end fitting 21 may be made of an electrically conductive material, then a ground connection from the active part 6 via the lower end fitting 21 and the lower cover 4 may be guided to the outside. Outside the housing 2, this earth connection can be grounded. Alternatively, the lower end fitting 21 can be made electrically insulating. Then, the active part 6 can be connected via a fluid-tight and electrically insulated against the lower lid 4, not shown here ground contact outside of the housing 2 to the ground. Frequently, the active part 6 is held together by tension elements not shown here. These are either arranged in a cage around the active part or surround the active part as a single tube-like tension element. The tension element or the tension elements are clamped on one side in the upper end fitting 20, on the other side either in the lower end fitting 21 or in the lower cover 4 and thus hold the active part together.
- the active part 6 here has three columns 10a, 10b and 10c. An alternative arrangement of two, four or more columns 10 would also be possible.
- An overvoltage absorber according to the invention preferably has an active part 6 of three or more columns 10.
- the columns 10 each extend along a longitudinal axis 31 parallel to the housing axis 30 and are in one row next to each other.
- An inner column 10b is flanked by two outer columns 10a, 10c.
- the columns 10 each consist of several stacks 7 of diverting elements 8.
- the stacks 7 are separated from one another by insulating intermediate pieces 9.
- the diverting elements 8 are provided here only by way of example with reference numerals and usually consist of a disk-shaped varistor block.
- the example of the column 10a the structure will be explained in more detail.
- the column 10a consists of a total of eighteen discharge elements 8, which are arranged one above the other in four stacks 7a, 7b, 7c and 7d, the stack 7a containing three discharge elements 8, the stacks 7b, 7c and 7d each having five discharge elements.
- the four stacks 7a, 7b, 7c and 7d are separated from each other by three insulating intermediate pieces 9a, 9b and 9c and are electrically insulated from one another within a column.
- the intermediate piece 9b for example, separates the stacks 7b and 7c from each other and isolates them from each other.
- a final piece of the column 9 d which isolates the stack 7 d against the end fitting 21.
- the columns 10b and 10c are similarly constructed, albeit with different numbers of stacks 7, diverters 8 and spacers 9.
- the outer pillars 10a, 10c are of similar construction but rotationally symmetric.
- the inner column 10b exclusively comprises stacks 7 with n discharge elements and the outer columns 10a, 10c stack 7 with 2n + 1 discharge elements, one stack each having n + 1 discharge elements 8 the outer columns 10a, 10c on one side completes.
- a connecting element 9 is arranged in each case.
- This connecting element 9 connects two stacks 7 of adjacent columns 10 with each other electrically.
- a connecting element 14c is guided from the column 10a, perpendicular to its longitudinal axis 31, into the adjacent column 10b, in which it is arranged between the stack 7i and the intermediate piece 9f adjoining it.
- the connecting element 14c thus connects the columns 10a and 10b at the same height. It establishes an electrical connection between the stacks 7c and 7i.
- the stacks 7c and 7i are thus connected in series.
- a current path 11 through the column 10a is thus interrupted here by the electrically insulating intermediate piece 9c and passed over the column 10b.
- a current path 11 through the active part 6 starts at the upper end fitting 20, is continued in the direction of the earth-side end 27 through the stack 7a of the column 10a, via the connecting element 14a in the stack 7e of the column 10b, there in the direction of high voltage side End 26, further through the connecting element 14d in the stack 7g of the column 10c, there back towards the earth end 27, finally via the connecting element 14e back on the stack 7f, the connecting element 14b in the stack 7c of the column 10a out.
- the connecting element 14a in the stack 7e of the column 10a starts at the upper end fitting 20
- the connecting element 14a in the stack 7e of the column 10b there in the direction of high voltage side End 26
- the connecting element 14d in the stack 7g of the column 10c there back towards the earth end 27, finally via the connecting element 14e back on the stack 7f, the connecting element 14b in the stack 7
- the intermediate pieces are formed as ends of one-piece support plates 15a, 15b.
- the intermediate pieces of two adjacent columns are combined to form a one-piece support plate 15a, 15b.
- the support plate 15a connects the columns 10a and 10b at the same height and serves the Increasing the mechanical stability of the active part 6.
- Intermediate pieces 9 and support plates 15 may be made of materials such as epoxy resin, cast resin, or other electrically insulating solids. The following is also described for spacers 9 for support plates 15, even if the support plates 15 are not explicitly mentioned.
- a connecting element 14 between the intermediate piece 9 and the stacks 7 adjacent thereto on both sides is arranged at each intermediate pieces 9 on its upper and lower sides. For each of these intermediate pieces 9, therefore, two electrical connections to adjacent columns 10 are made.
- the intermediate pieces 9 and the connecting elements 14 are dimensioned in their thickness so that the columns 10 have the same height, even if they contain different numbers of spacers 9, and stacks 7.
- the connecting elements 14 may be thin metal plates, or in the case of the support plates 15 on the top and bottom of the support plates 15 applied metallic layers.
- the housing wall 3 has an elliptical
- the housing 2 in this case has a long axis 12 and a short axis 13, wherein the long axis 12 is longer than the short axis 13.
- the row of columns 10 is arranged along the long axis 12.
- the housing 2 may also have a nozzle 22 which is closable with a manhole cover 23. In the manhole cover, a blow-off opening closed with a membrane can be arranged which, in the event of an erroneous pressure increase, breaks in the housing 2 and discharges the pressure to the outside.
- a Ausblasschute 24 can thereby redirect the resulting fluid flow in a direction in which no other parts of the system can be affected by the fluid flow.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2013/058782 WO2014173462A1 (en) | 2013-04-26 | 2013-04-26 | Encapsulated surge arrester |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2976773A1 true EP2976773A1 (en) | 2016-01-27 |
Family
ID=48326286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13721317.9A Withdrawn EP2976773A1 (en) | 2013-04-26 | 2013-04-26 | Encapsulated surge arrester |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2976773A1 (en) |
JP (1) | JP6324488B2 (en) |
KR (1) | KR20150135486A (en) |
CN (1) | CN105122386A (en) |
WO (1) | WO2014173462A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3082136B1 (en) * | 2015-04-14 | 2017-11-01 | Siemens Aktiengesellschaft | Gas-insulated surge arrestor |
EP3131098B1 (en) | 2015-08-12 | 2018-02-28 | Siemens Aktiengesellschaft | Enclosed surge voltage protector |
RU183133U1 (en) * | 2017-10-26 | 2018-09-12 | Закрытое акционерное общество "Завод электротехнического оборудования" (ЗАО "ЗЭТО") | OVERVOLTAGE LIMITER |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3412273A (en) * | 1964-10-28 | 1968-11-19 | Westinghouse Electric Corp | High voltage lightning arrester having a plurality of arrester elements |
JPS58186183A (en) * | 1982-04-24 | 1983-10-31 | 株式会社日立製作所 | Arrester |
JPH0773085B2 (en) | 1987-04-07 | 1995-08-02 | 株式会社日立製作所 | Ground tank type arrester |
EP1603141B1 (en) * | 2004-06-04 | 2016-08-24 | ABB Schweiz AG | Surge arrester with insulation by gas |
DE102007057265A1 (en) * | 2007-11-26 | 2009-05-28 | Siemens Ag | isolator assembly |
JP5234092B2 (en) * | 2010-12-01 | 2013-07-10 | 株式会社日立製作所 | Lightning arrestor |
DE102011077394A1 (en) | 2011-06-10 | 2012-12-13 | Siemens Aktiengesellschaft | Surge arresters |
-
2013
- 2013-04-26 KR KR1020157030782A patent/KR20150135486A/en active Search and Examination
- 2013-04-26 WO PCT/EP2013/058782 patent/WO2014173462A1/en active Application Filing
- 2013-04-26 JP JP2016509307A patent/JP6324488B2/en not_active Expired - Fee Related
- 2013-04-26 EP EP13721317.9A patent/EP2976773A1/en not_active Withdrawn
- 2013-04-26 CN CN201380075741.XA patent/CN105122386A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO2014173462A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2014173462A1 (en) | 2014-10-30 |
JP6324488B2 (en) | 2018-05-16 |
KR20150135486A (en) | 2015-12-02 |
JP2016521003A (en) | 2016-07-14 |
CN105122386A (en) | 2015-12-02 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20151022 |
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AX | Request for extension of the european patent |
Extension state: BA ME |
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DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AKTIENGESELLSCHAFT |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
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17Q | First examination report despatched |
Effective date: 20180924 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS ENERGY GLOBAL GMBH & CO. KG |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20211103 |