EP2979278B1 - Gekapselter überspannungsableiter - Google Patents

Gekapselter überspannungsableiter Download PDF

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Publication number
EP2979278B1
EP2979278B1 EP13721316.1A EP13721316A EP2979278B1 EP 2979278 B1 EP2979278 B1 EP 2979278B1 EP 13721316 A EP13721316 A EP 13721316A EP 2979278 B1 EP2979278 B1 EP 2979278B1
Authority
EP
European Patent Office
Prior art keywords
housing
surge arrester
arrester
sectional contour
lower cover
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.)
Not-in-force
Application number
EP13721316.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2979278A1 (de
Inventor
Markus Sulitze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
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 Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Publication of EP2979278A1 publication Critical patent/EP2979278A1/de
Application granted granted Critical
Publication of EP2979278B1 publication Critical patent/EP2979278B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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

  • the invention relates to an encapsulated surge arrester according to the preamble of claim 1.
  • Surge arresters are protection systems, for example for switchgear, which divert these overvoltages to ground in the event of overvoltages caused by lightning strikes or malfunctions of other subsystems and thus protect other components of the switchgear.
  • Such a surge arrester comprises one or more cylindrical discharge elements which have a varistor column constructed from individual, likewise 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 depends on the material, they show good conductivity.
  • Varistor elements are often made from metal oxides such as zinc oxide.
  • the diverting element is limited at both ends by end fittings that establish electrical contact with the switchgear and ground.
  • the varistor column must be held together under pressure. This can be done in that tension elements, for example ropes or rods, preferably made of glass fiber reinforced plastic, are clamped under tension in the end fittings. The tension elements surround the varistor column and thus form a cage around it.
  • surge arresters For use in gas-insulated switchgear systems, surge arresters have an encapsulated, fluid-tight housing that surrounds the discharge element.
  • the housing is filled with a fluid, usually sulfur hexafluoride, to increase the dielectric strength.
  • the housing consists of a conductive material, for example a metal, and is electrically grounded.
  • An end fitting of the discharge column is earthed via a contact that is led through the housing.
  • the other end fitting is electrically connected via a bushing to a contact located on the outside of the housing, which is used for connection to the switchgear.
  • a separate surge arrester with an encapsulated housing can be used for each phase, or one that has three discharge columns, one for each phase, in an encapsulating housing.
  • the subject matter of the invention is a surge arrester with three discharge columns arranged in a housing.
  • the three deflection columns can be electrically isolated from one another and can be connected to the three phases of a switchgear, or electrically connected to one another and connected to one phase of the switchgear.
  • JP 9284927A The shows a similar surge arrester JP 9284927A .
  • three deflection columns arranged in a triangle are housed in a circular cylindrical housing.
  • the object of the present invention is to specify a more cost-effective surge arrester.
  • a surge arrester has a fluid-tight housing.
  • a housing wall of the housing extends along one Housing axis between a lower cover and an upper cover.
  • the surge arrester has three discharge columns arranged in the housing, the longitudinal axes of which are parallel to the housing axis and in cross section on the corners of one Are arranged in a triangle.
  • the housing wall has a triangular cross-sectional contour in a section along the housing axis.
  • the housing has smaller external dimensions than a housing with a circular cross-sectional contour. The cost of materials is lower, and the housing is therefore less expensive.
  • more compact housings are advantageous in the often confined spaces of a switchgear.
  • such a housing has a smaller volume than a corresponding one with a circular cross-sectional contour, as a result of which fluid for the filling is saved.
  • the triangular cross-sectional contour has rounded corners which each curve around a discharge column in such a way that the insulation distance between the discharge element of this discharge column and the housing wall is not undershot. In this way, a particularly compact housing can be achieved while maintaining the necessary isolation distance.
  • the triangular cross-sectional contour has outwardly curved sides.
  • a slight external curvature the radius of curvature of which is considerably larger than that of a corresponding housing with a circular cross-sectional contour, can withstand the internal pressure better and still enables a more compact housing than in the prior art.
  • the housing wall tapers from the section with the triangular contour towards the lower cover to a circular cross-sectional contour.
  • the taper causes an additional volume reduction and the transition from a triangular cross-sectional contour to a circular one allows a smooth transition to the circular flange.
  • an advantageous embodiment of the invention provides that a blow-out opening is arranged in the lower cover is. This makes it possible to dispense with a connecting piece on the housing wall, which on the one hand makes the housing more compact and on the other hand can be manufactured more cost-effectively.
  • the Figure 1 shows a known surge arrester 1 of the 3ES5-C type, as sold by Siemens AG.
  • This has an encapsulating, fluid-tight housing 2.
  • the housing 2 is usually made of a conductive material such as metal and is filled with an electrically insulating fluid such as sulfur hexafluoride when it is ready for operation.
  • the pressure of the fluid can be several thousand hectopascals.
  • the housing 2 must therefore be pressure-resistant.
  • the housing 2 is cylindrical and is closed at the end faces with a lower cover 4 and an upper cover 5.
  • a housing wall 3 extends between the upper cover 5 and the lower cover 4 along a housing axis 30.
  • Three discharge columns 20 are arranged in the housing 2, which are provided for the protection of a three-phase gas-insulated switchgear. These diverting columns 20 each have a cylindrical diverting element 24, an end fitting 22 on the high-voltage side, an end fitting 21 on the ground side and a plurality of tension elements 23.
  • the discharge elements 24 are composed of individual, cylindrical varistor blocks to form a column.
  • the end fitting 22 on the high-voltage side and the end fitting 21 on the ground side usually consist of electrically conductive material.
  • the tension elements 23 are pressed into the high-voltage end fitting 22 and the earth-side end fitting 21 and thus hold the discharge column 20 together.
  • Retaining disks, which have holes through which the tension elements 23 are guided and thus additionally stabilize the deflection column 20, can also be inserted into the discharge element 24.
  • a control hood 25 extends from the high-voltage end fitting 22 along the diverting column 24. This serves for a more uniform field distribution along the diverting column 20.
  • a ground contact 13 is fluid-tight and electrically insulated through the lower cover 4 from the inside to the outside of the housing 2 and serves as the ground connection.
  • this earth contact 13 is connected to the discharge element 24 in an electrically conductive manner via the earth-side end fitting 21.
  • the lower cover 4 has a filling connection 29 via which fluid, for example sulfur hexafluoride, can be filled into the housing 2 or drained off. Pressure and / or leak monitoring devices can also be connected to this filling connection 29.
  • the top surface of the housing 2 is closed with an upper cover 5, which is provided with an insulating part 7, often made of cast resin, through which a high-voltage bushing 11 is passed to the electrical high-voltage potential without the risk of flashover between High voltage and grounded housing 2 from the outside into the housing 2 to lead into.
  • the high-voltage bushing 11 is designed here as a three-pole bushing 11, one for each of the diverting columns 20, which leads three high-voltage contacts 12, insulated from one another and from the housing 2, into the housing 2 in a fluid-tight manner.
  • the surge arrester 1 can be connected to a three-phase gas-insulated switchgear, not shown here, via the high-voltage bushing 11. In the interior of the housing 2, the high-voltage contacts 12 protrude like fingers into the housing 2.
  • the housing 2 is essentially cylindrical.
  • the housing axis 30 extends along the cylinder axis.
  • the longitudinal axes of the deflection columns 20 are aligned parallel to this housing axis 30 and are arranged rotationally symmetrically around it.
  • the longitudinal axes of the deflection columns 20 thus run along the edges of a triangular prism, the central axis of which lies on the housing axis 30.
  • the housing 2 has a connecting piece 15 on its outer surface, which is closed by a manhole cover 16.
  • a manhole cover 16 In the manhole cover 16 there is a blow-out opening closed with a membrane with a blow-out chute 17.
  • the membrane tears and the pressure is released to the outside through the blow-out opening. This can prevent the housing 2 from bursting.
  • the resulting fluid flow is deflected by a blow-out chute 17 in a direction in which no other system parts are impaired by the fluid flow.
  • the Figure 2 shows a surge arrester 1 according to the invention. Further details are shown in the sections according to FIG Figures 3 and 4th .
  • the basic construction is that of Figure 1 very similar, which is why only differences will be discussed. Because of the sectional representation, only two of the three deflection columns 24 are visible here. An earth-side end fitting was dispensed with here. Instead, the tension elements are clamped directly to a lower cover 4 of the housing 2. Alternatively could an earth-side end fitting which can be fastened to the lower cover 4 and with which the tension elements 23 are braced can also be provided.
  • the diverting element 24 is electrically isolated from the lower cover 4 by an insulating intermediate piece 26.
  • the lower cover 4 also has a blow-out opening 32 closed with a membrane 33 with a blow-out chute 17.
  • the housing wall extends from an upper flange 18 initially with a circular cross-sectional contour in the direction of the earth connection side 27.
  • the cross-sectional contour widens to a triangular cross-sectional contour, which then extends over a section 10 along the housing axis 30 extends.
  • This cross-sectional contour is in Figure 4 shown in more detail. As can be seen there, the cross-sectional contour is triangular.
  • Three sides 9 are connected to one another by three corners 8. The sides 9 go smoothly into the corners 8.
  • the corners 8 are rounded in the form of a segment of a circle. Alternatively, the corners 8 can also be rounded in the form of a section of a hyperbola.
  • the longitudinal axes 35 of the deflection columns 20 lie on a line from the housing axis 30 to the center of the corner 8.
  • the longitudinal axis 35 preferably lies in the center of the circle of which the corner 8 forms a segment of a circle or in the focal point of the hyperbola from which the corner 8 forms a section.
  • the distance between the inside of the housing wall 3 and the outside of the discharge element 24 is smallest on the connecting line from the housing axis 30 to the center of the corner 8. On both sides of this connecting line, the corner curves in such a way that this distance increases. This ensures that the insulation distance between the diverting element 24 of this diverting column 20 and the housing wall is not undershot.
  • the radius of curvature of the corner 8 is considerably smaller, typically less than half, than the inner diameter of a corresponding housing with a circular cross-sectional contour.
  • the inside diameter of such a circular housing the distance from the housing axis 30 to the inner wall of the center of the corner 8.
  • the insulation distance of a surge arrester 1 is the distance between a live part and a grounded part of the surge arrester 1, which must not be undershot, so that there are no flashovers between the housing, which is usually grounded, and the live part.
  • the insulation distance depends on the voltage for which the surge arrester 1 is designed, on the type and pressure of the fluid filled into the housing 2 and on the geometry of the surge arrester 1. For example, the insulation distance is smaller in the vicinity of the earth-side end fitting 21, than in the vicinity of the high-voltage end fitting 22.
  • the corners 8 are connected to one another by sides 9.
  • the transition from a corner 8 to a side 9 is smooth, that is, without edges or further corners.
  • the sides 9 can be straight or slightly curved outwards.
  • the radius of curvature of the sides 9 is considerably larger, for example more than double, than the radius of the inside diameter of a corresponding circular housing.
  • the housing wall 3 tapers from the section with the triangular contour towards the lower cover.
  • the cross-sectional contour changes in such a way that the radii of curvature of the corners 8 are flattened until the cross-sectional contour is finally circular in the area of the lower cover.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Gas-Insulated Switchgears (AREA)
EP13721316.1A 2013-04-26 2013-04-26 Gekapselter überspannungsableiter Not-in-force EP2979278B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/058781 WO2014173461A1 (de) 2013-04-26 2013-04-26 Gekapselter überspannungsableiter

Publications (2)

Publication Number Publication Date
EP2979278A1 EP2979278A1 (de) 2016-02-03
EP2979278B1 true EP2979278B1 (de) 2021-02-17

Family

ID=48326285

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13721316.1A Not-in-force EP2979278B1 (de) 2013-04-26 2013-04-26 Gekapselter überspannungsableiter

Country Status (5)

Country Link
EP (1) EP2979278B1 (ja)
JP (1) JP6539646B2 (ja)
KR (1) KR20160003133A (ja)
CN (1) CN105144312B (ja)
WO (1) WO2014173461A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6595428B2 (ja) * 2016-09-16 2019-10-23 株式会社東芝 避雷器

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1664194A (en) * 1924-09-05 1928-03-27 Gen Electric Protective device
FR1206291A (fr) * 1958-07-07 1960-02-09 Acec Parafoudre pour très haute tension
DE1161634B (de) * 1960-11-14 1964-01-23 Westinghouse Electric Corp UEberspannungsableiter
US4439807A (en) * 1982-08-18 1984-03-27 General Electric Company Secondary arrester
JPH09284927A (ja) 1996-04-09 1997-10-31 Nissin Electric Co Ltd 避雷器を備えたガス絶縁電気機器
JP3612519B2 (ja) * 2002-03-01 2005-01-19 ティーエム・ティーアンドディー株式会社 避雷器
DE102007057265A1 (de) * 2007-11-26 2009-05-28 Siemens Ag Isolatoranordnung
CN201266525Y (zh) * 2008-05-06 2009-07-01 正泰电气股份有限公司 一种三相共罐金属氧化物避雷器
CN202258607U (zh) * 2011-08-24 2012-05-30 中国西电电气股份有限公司 252kV GIS用三相共罐式无间隙金属氧化物避雷器
CN104439807A (zh) * 2014-11-27 2015-03-25 佛山市南海耀达建材有限公司 一种全自动焊接工作站及其焊接方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN105144312A (zh) 2015-12-09
KR20160003133A (ko) 2016-01-08
JP6539646B2 (ja) 2019-07-03
CN105144312B (zh) 2018-02-02
JP2016521002A (ja) 2016-07-14
WO2014173461A1 (de) 2014-10-30
EP2979278A1 (de) 2016-02-03

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