EP2195814A1 - Dispositif de protection contre les surtensions - Google Patents

Dispositif de protection contre les surtensions

Info

Publication number
EP2195814A1
EP2195814A1 EP08839355A EP08839355A EP2195814A1 EP 2195814 A1 EP2195814 A1 EP 2195814A1 EP 08839355 A EP08839355 A EP 08839355A EP 08839355 A EP08839355 A EP 08839355A EP 2195814 A1 EP2195814 A1 EP 2195814A1
Authority
EP
European Patent Office
Prior art keywords
surge arrester
stack
stabilizing
varistor blocks
outer housing
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
EP08839355A
Other languages
German (de)
English (en)
Other versions
EP2195814B1 (fr
Inventor
Hartmut Klaube
Torsten HÖLZER
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.)
Tridelta Ueberspannungsableiter GmbH
Original Assignee
Tridelta Ueberspannungsableiter GmbH
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 Tridelta Ueberspannungsableiter GmbH filed Critical Tridelta Ueberspannungsableiter GmbH
Publication of EP2195814A1 publication Critical patent/EP2195814A1/fr
Application granted granted Critical
Publication of EP2195814B1 publication Critical patent/EP2195814B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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 a surge arrester with cage design, as it is known for example from JP 63-312602.
  • Surge arresters are connected in power supply systems between live lines and ground to derive in the event of an overvoltage in the line this to ground and to protect other components of the power grid.
  • Such a surge arrester contains a stack of varistor blocks, which is held between two connection elements. This arrangement is accommodated in an outer housing.
  • Surge arresters are capable of safely dissipating overvoltages occurring within their design range as often as possible to ground.
  • the varistor blocks usually zinc oxide ceramic elements, have the property that their electrical resistance is voltage-dependent. That is, below a threshold voltage, the varistor blocks are good insulators. Above this voltage, however, they are well electrically conductive.
  • overvoltage arresters with "tube design" in which the active components are accommodated in a tube, for example made of ceramic or a dimensionally stable plastic.
  • a gas volume remains in the interior of the outer housing.
  • the outer casing of this surge arrester is further provided with a gas outlet opening, through which, in the case of
  • surge arresters in which the outer casing is poured or injected directly around the active components.
  • a high quality plastic usually silicone is used, as described for example in EP-O 963 590 Bl.
  • a disadvantage of the tube-type surge arresters is that partial discharges may occur through the gas voids between the core and the outer housing. To avoid this, the entry of moisture into the gas volume should be prevented. Often a gas with better insulator properties than air is used. It must also be avoided that an exchange of the gas with the ambient air or the ingress of moisture occurs. Tube design surge arresters are therefore relatively expensive to manufacture. Despite these disadvantages, surge arresters with a tubular design are particularly prevalent at extremely high voltages of several hundred thousand volts, since surge arresters with a height of several meters are thus possible.
  • Surge arresters of this type have heretofore been at relatively low voltages, i. limited to tens of thousands of volts. For higher voltages, several surge arresters were connected in series.
  • the object of the invention is therefore to provide a surge arrester with cage design and directly encapsulated plastic outer housing, which has an improved stability, without the additional cyclistgeophuse- material should be used.
  • the object is achieved by a surge arrester according to claim 1.
  • Fig. 1 shows a partial sectional view of a
  • FIG. 2 shows a first half of a mold for the manufacture of the housing of the surge arrester according to the invention
  • Fig. 3 shows a second half of the mold for the production of the housing of the surge arrester according to the invention.
  • FIG. 4 is a detail view of Fig. 1; and FIG. 5 shows a detailed view of a stabilizing disk.
  • the surge arrester shown in FIG. 1 comprises two terminal blocks or end fittings 3, between which a plurality of arrester blocks, for example varistor blocks 1, are arranged.
  • the varistor blocks 1 are, for example, circular cylindrical or polygonal. They are usually formed from zinc oxide with appropriate dopants.
  • the Varistor material has the property that it has a high electrical resistance below a threshold voltage, while the electrical resistance drops significantly above this threshold voltage. The transition in zinc oxide is very steep. In this way, it is possible to protect other components in a high voltage network against overvoltage 2u, as this overvoltage flows through the surge arrester to ground.
  • reinforcing elements 9 are provided in the surge arrester shown in FIG.
  • the reinforcing elements 9 are glass fiber rods, which are anchored in the two terminal blocks.
  • the anchoring in the connection blocks can be done by wedges, by crimping, through
  • the terminal blocks 3 are provided with a central screw 4 which serves to connect the surge arrester to the high voltage network.
  • the core of the surge arrester formed in this way is equipped with an outer housing 5 with a plurality of sheds 7.
  • the outer housing houses the varistor blocks with no intervening fluid volume or voids.
  • two different screens 7 are formed along the longitudinal direction of the surge arrester, namely large diameter screens 7a and 7b small diameter screens.
  • the exact dimensions, distances and shapes of the screens depend on the intended use of the surge arrester.
  • the task of the screens 7 is u.a. the extension of the leakage path for the current between the two connection points of the surge arrester as well as the enlargement of the heat radiating surface of the
  • Surge arrester Although the design of the surge arrester with two different screen sizes has proven successful, the invention is not limited thereto. It is also possible to equip the surge arrester with only one screen size, or to provide three or more different screen shapes along a surge arrester. In practice, it has proven to be advantageous to adjust the screens 7 with a kink relative to the longitudinal axis of the surge arrester, with angles of 5 to 20 ° being preferred. This construction facilitates the drainage of rainwater when using the surge arrester under the open sky.
  • the terminal blocks 3 are also largely received in the outer housing 5 and encapsulated with, as shown in Fig. 1, in which case there are no intervening fluid volume or cavities.
  • the silicone material used for the outer housing 5 is a considerable cost factor in the manufacture of surge arresters according to the invention.
  • the outer case 5 is therefore formed as thin as possible.
  • the diameter of the surge arrester in the region between two shields 7 is smaller than in the region of a connection block 3.
  • the surge arrester furthermore has one or more stabilizing disks 25, which are arranged between two respective varistor blocks 1.
  • FIG. 5 A detailed view of such a stabilizing disk 25 is given in FIG. 5.
  • the stabilizing disk is about 5 mm thick.
  • the stabilizing disc 25 Along the circumference of the stabilizing disc 25, a number of through holes 27 are formed, through which the GRP rods 9 run.
  • the through holes 27 are so far away from the edge of the stabilizing disk 25 that sufficient stability can be ensured.
  • the distance between the edge of each through hole 27 and the outer periphery of the stabilizing disk 25 is at least 3 mm.
  • the surge arrester With this construction, even with overloading of the surge arrester, it can be safely and effectively prevented that larger fragments of the varistor blocks 1 are thrown outwards through the outer housing 5.
  • the surge arrester thus produced exhibits excellent bending and torsional strength, making it predestined for use outdoors, even at very long lengths. In special cases, lengths of 2.5 m or more are possible, with several as needed
  • Stabilizing discs 25 are used distributed over the length of the surge arrester.
  • the stabilizing discs 25 are distributed over the length of the surge arrester in such a way that they are arranged respectively in the region of one of the screens 7 r as shown in Fig. 4 in detail. Since it is necessary on the one hand, the
  • Stabilization disks 25 to be provided with a good insulation by the outer housing 5, so that an overlap of a few millimeters is necessary, but there on the other hand
  • the stabilizing disk 25 is provided in the region of the umbrellas 7, where a sufficient coverage with
  • the surge arrester is fabricated in a modular form as shown in FIGS. 2 and 3.
  • the modular shape allows to achieve an accurate positioning of the stabilizing discs.
  • the required number of Varistorblöcken 1 is compiled depending on the required ⁇ pannungsfesttechnik the surge arrester. Between the individual Varistorblöcken 1 may be interposed to improve the electrical contact between these blocks Aluininiumministerin.
  • one or more stabilizing discs are inserted in the stack.
  • spacers made of aluminum which substantially correspond in their shape to the varistor blocks 1, can furthermore be provided.
  • two end fittings 3 are provided. From the end fittings 3, the Varistorblöcken 1, the stabilizing discs 25 and possibly the spacers and contact discs a stack is formed.
  • disc springs or other elements may be added to the stack as needed.
  • glass fiber reinforced plastic rods 9 are then placed between the end fittings 3 and clamped to hold the stack of varistor blocks 1 and armndarmaturen 3 under train.
  • the core thus formed is inserted into a mold shown in Fig. 2.
  • the form shown in Fig. 2 is modular and comprises a head part 11 and a foot part 13, which correspond respectively to the two end fittings 3. Between the head part 11 and the foot part 13 a selectable number of intermediate parts 15 is provided, so that a total of a modular structure is formed.
  • the mounting plate 17 is provided with a screening, so that the distance between the head part 11 and the foot part 13 is adjustable, so that a variable number of intermediate parts 15 can be used.
  • the intermediate parts 15 contain the heating elements (not shown) necessary for the filling and cross-linking process of the silicone, as well as cooling and venting channels 19 and 21.
  • the heating elements and cooling channels 19 of the individual intermediate parts 15 are provided with connections which are also of In this way, an interconnection of the heating elements or the cooling channels is possible, which allows a specific, spatially different and possibly also time-dependent temperature control of the individual sections of the mold and thus can positively influence the cross-linking process of the silicone
  • the intermediate parts 15 touch each other along the peripheral edge of a screen 7 of the outer casing S. In other words, when the upper side of a screen 7 is formed by a first intermediate part 15, the lower side of the same screen 7 is formed by the next intermediate part 15. E Ine seam, which when pouring along the
  • Transition line of the two intermediate parts 15 is formed, therefore, coincides with the outer periphery of the screen 7.
  • Fig. 3 the corresponding counterpart to the mold half of Fig. 2 is shown.
  • the molded parts shown in Figs. 2 and 3 are brought together after inserting the core and fixedly connected to each other by means of a locking device. Subsequently, the silicone elastomer is injected under pressure and crosslinked with heat.
  • the individual parameters of this cross-linking process such as the optimum temperature, the required pressure or the flow velocities depend on the selected one
  • Plastic material and are known in the art. For example, a temperature of 50 to 300 °, preferably 80 to 150 0 C, and a pressure of 1 to 20 bar are selected. After the cross-linking process of the silicone, the mold is again separated into the two halves shown in FIGS. 2 and 3 and the surge arrester is removed. Since the silicone is still relatively elastic even in the cured state, the umbrellas easily detach from the undercuts formed by the mold.
  • an intermediate part 23 is provided at least in one of the two mold halves, especially for injection molding. To avoid visible injection points in the silicone housing, it is preferable to place this injection point so that it forms on the underside of a screen 7.
  • FIGS. 2 and 3 it is possible to adjust the length of the surge arrester very flexibly without having to produce new shapes. For this purpose, it is sufficient to remove individual intermediate parts 15 from the mold and to shorten them accordingly or to insert further intermediate parts 15.
  • the shape also allows a great deal of flexibility with regard to the exact shaping of the terminal blocks, since different diameters can easily be realized for these sections of the high-voltage arrester by simply exchanging the head part 11 or the foot part 13.
  • Another advantage of the described manufacturing method is that different screen shapes or screen sequences are possible, in particular special screens can be provided where stabilizing discs 25 are arranged.
  • the invention is basically not limited to the production of surge arresters with Varistorblöcken. It is also possible to produce the surge arrester with a spark gap with the method according to the invention.
  • Another advantage of the invention is that the intermediate parts 15 of the mold can be produced simply and inexpensively, for example on a turning or milling machine. In the assembly, however, undercuts are possible that are otherwise difficult or impossible to achieve in one-piece molds.
  • the glass fiber reinforced plastic rods may also be envisaged to fasten the glass fiber reinforced plastic rods to the stabilizing discs also in the longitudinal direction. This can be done for example by crimping.

Landscapes

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

Abstract

L'invention concerne un dispositif de protection contre les surtensions pourvu d'un module (1, 3, 9, 25) qui comprend un empilement de blocs de varistance (1), deux armatures d'extrémité entre lesquelles l'empilement de blocs de varistance (1) est maintenu, une pluralité d'éléments de renforcement (9) qui s'étendent entre les armatures d'extrémité (3) et sont fixés à celles-ci, ces éléments de renforcement (9) entourant l'empilement de blocs de varistance, ainsi qu'au moins un disque de stabilisation (25) qui est disposé entre deux blocs de varistance (1) dans l'empilement et guide au moins un élément de renforcement (9). Ce dispositif est pourvu en outre d'un boîtier extérieur (5) à éléments de blindage dans lequel le module est logé au moins partiellement. Le dispositif de protection contre les surtensions selon l'invention se caractérise en ce que le boîtier extérieur est conçu de telle sorte que le module est logé dans celui-ci sans présence de gaz, de liquide, d'un volume ou de cavités entre le module et le boîtier extérieur. Par ailleurs, chacun des disques de stabilisation (25) est disposé dans la région d'un des éléments de blindage (7).
EP08839355A 2007-10-12 2008-09-24 Dispositif de protection contre les surtensions Not-in-force EP2195814B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007048986A DE102007048986B4 (de) 2007-10-12 2007-10-12 Überspannungsableiter
PCT/EP2008/062797 WO2009050011A1 (fr) 2007-10-12 2008-09-24 Dispositif de protection contre les surtensions

Publications (2)

Publication Number Publication Date
EP2195814A1 true EP2195814A1 (fr) 2010-06-16
EP2195814B1 EP2195814B1 (fr) 2011-02-16

Family

ID=40383932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08839355A Not-in-force EP2195814B1 (fr) 2007-10-12 2008-09-24 Dispositif de protection contre les surtensions

Country Status (13)

Country Link
US (1) US8305184B2 (fr)
EP (1) EP2195814B1 (fr)
JP (1) JP4898960B2 (fr)
KR (1) KR101124934B1 (fr)
CN (1) CN101816050B (fr)
AR (1) AR068741A1 (fr)
AT (1) ATE498895T1 (fr)
BR (1) BRPI0817611A2 (fr)
DE (2) DE102007048986B4 (fr)
ES (1) ES2361282T3 (fr)
HK (1) HK1146149A1 (fr)
RU (1) RU2452053C2 (fr)
WO (1) WO2009050011A1 (fr)

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DE102009007067A1 (de) * 2009-01-29 2010-08-05 Siemens Aktiengesellschaft Impedanzanordnung mit einem ersten Armaturkörper
DE102009051155A1 (de) * 2009-10-29 2011-05-05 Verfahrenstechnik Hübers GmbH Vorrichtung zum Herstellen von Kunststoff-Verbundformkörpern und damit hergestellter Formkörper
DE102010043655B4 (de) * 2010-11-09 2012-08-30 Siemens Aktiengesellschaft Überspannungsableiter mit dehnbarer Manschette
DE102011078210A1 (de) * 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Überspannungsableiter
US8629751B2 (en) * 2011-12-14 2014-01-14 Tyco Electronics Corporation High amperage surge arresters
EP2690633A1 (fr) 2012-07-26 2014-01-29 Siemens Aktiengesellschaft Paratonnerre avec éléments de traction maintenus par des boucles
DE102013213688A1 (de) * 2013-07-12 2015-01-15 Siemens Aktiengesellschaft Gussverfahren zur Herstellung einer Schutzummantelung um einen Überspannungsableiter und eine Gießform hierfür
US9524815B2 (en) * 2013-11-05 2016-12-20 Abb Schweiz Ag Surge arrester with moulded sheds and apparatus for moulding
GB201405753D0 (en) * 2014-03-31 2014-05-14 M & I Materials Ltd Varistor
US9472327B1 (en) * 2015-12-21 2016-10-18 Cooper Technologies Company Hollow core arrester strength membrane
DE102017216024A1 (de) * 2017-09-12 2019-03-14 Siemens Aktiengesellschaft Überspannungsableiter
US10304598B1 (en) * 2018-01-19 2019-05-28 Te Connectivity Corporation Surge arresters and related assemblies and methods
US11295879B2 (en) 2020-07-24 2022-04-05 TE Connectivity Services Gmbh Surge arresters and related assemblies and methods
USD1019339S1 (en) * 2021-12-29 2024-03-26 The Trustees for the Time Being of the Live Line International Trust Support arrangement

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Also Published As

Publication number Publication date
BRPI0817611A2 (pt) 2015-03-31
EP2195814B1 (fr) 2011-02-16
AR068741A1 (es) 2009-12-02
KR101124934B1 (ko) 2012-03-27
CN101816050B (zh) 2013-01-02
WO2009050011A1 (fr) 2009-04-23
KR20100051739A (ko) 2010-05-17
US20100237980A1 (en) 2010-09-23
DE102007048986A1 (de) 2009-05-07
ES2361282T3 (es) 2011-06-15
DE102007048986B4 (de) 2011-02-03
DE502008002642D1 (de) 2011-03-31
CN101816050A (zh) 2010-08-25
ATE498895T1 (de) 2011-03-15
JP2010541263A (ja) 2010-12-24
HK1146149A1 (en) 2011-05-13
JP4898960B2 (ja) 2012-03-21
US8305184B2 (en) 2012-11-06
RU2452053C2 (ru) 2012-05-27
RU2010112696A (ru) 2011-10-10

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