EP1466334B1 - Überspannungsableiter - Google Patents

Überspannungsableiter Download PDF

Info

Publication number
EP1466334B1
EP1466334B1 EP03704226A EP03704226A EP1466334B1 EP 1466334 B1 EP1466334 B1 EP 1466334B1 EP 03704226 A EP03704226 A EP 03704226A EP 03704226 A EP03704226 A EP 03704226A EP 1466334 B1 EP1466334 B1 EP 1466334B1
Authority
EP
European Patent Office
Prior art keywords
pressure relief
core
surge arrester
relief arrangement
blocks
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.)
Expired - Lifetime
Application number
EP03704226A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1466334A2 (de
Inventor
S. Tridelta Überspannungsableiter GmbH Bohrisch
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 EP1466334A2 publication Critical patent/EP1466334A2/de
Application granted granted Critical
Publication of EP1466334B1 publication Critical patent/EP1466334B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure

Definitions

  • the invention relates to a surge arrester with Varistorblöcken, preferably with metal oxide Varistorblöcken, and a pressure relief arrangement for such a surge arrester.
  • EP-A-0 233 022 discloses a generic surge arrester having a core with a stack of terminal blocks, varistor blocks, and optionally heat sink blocks / spacer blocks, a shell surrounding the core, and a plastic outer housing provided with isolating bells.
  • the varistor blocks, terminal blocks and the optional heat sink / spacer blocks are in head-to-head contact with each other and are fixed together, for example by gluing.
  • Surge arresters are usually provided in power supply networks to protect them from overvoltage due to lightning or the like.
  • the varistor blocks are preferably cylindrical blocks of sintered ceramic, so-called metal oxide varistors, in particular zinc oxide varistors.
  • varistor vari able resi stor
  • Zinc oxide varistors consist of n-doped zinc oxide ceramics with electrically conductive crystallites or "grains" and potential barriers at the grain boundaries. Up to a certain voltage, the "varistor voltage" U 0 , the varistor blocks are high-impedance, because the potential barriers prevent the transport of the electrons and the voltage drops almost exclusively at the grain boundaries.
  • the Ceramic varistor block becomes electrically conductive.
  • the varistor voltage depends on the number of grain boundaries between the electrodes, that is, the thickness and the size of the grains. Below the varistor voltage, in AC operation, such a zinc oxide varistor block behaves like a capacitor due to the grain boundary capacitance. Its capacity is greater the smaller U 0 .
  • the current / voltage characteristic is extremely non-linear with differential resistors in the M ⁇ range slightly below the varistor voltage and in the m ⁇ range just above the varistor voltage.
  • the envelope of the surge arrester is said EP-A-0 233 022 made of a glass fiber reinforced plastic material, which is firmly applied to the outer periphery of these blocks and crosslinked with them. In this way, a rigid structure forms, which withstands high internal pressures.
  • German Offenlegungsschrift DE 199 27 940 A1 which is based on the same applicant as the present application, proposes to arrange an additional adhesive tape around the core in the area of the aluminum contact disks with which the glass fiber material of the casing does not crosslink, so that predetermined breaking points are present at least there.
  • JP 05 020947 A discloses a surge arrester according to the preamble of claim 1.
  • the annular varistor blocks provided in this prior art are held under tension by a glass fiber rod extending in the openings of the rings.
  • a glass fiber rod extending in the openings of the rings.
  • This gas volume tends to increase in pressure as the temperature increases.
  • annular elements are contained in the stack of varistor blocks, in which through holes for pressure equalization are provided perpendicular to the stacking direction.
  • JP 08 316007 A1 Another surge arrester is out JP 08 316007 A1 known.
  • cylindrical varistor blocks are provided, in which the electrodes provided on or at the end faces of the varistor blocks have recesses. Between the core and the outer housing, a gas or air volume is provided. Air is a good heat insulator. This leads to a heating of the core and requires appropriate countermeasures in the form of air circulation channels in the electrodes.
  • the object of the invention is therefore to provide a surge arrester of the above type, which avoids this problem and in particular excludes an explosive bursting in case of overload.
  • a pressure relief arrangement for a surge arrester which has the shape of a flat disc with comb-shaped outgoing from one side slots.
  • the object is achieved by a surge arrester whose core is equipped with one or a row of slots extending in a plane perpendicular to the longitudinal direction of the arrester.
  • the pressure relief arrangement according to the invention for a surge arrester has the shape of a disc which has a passageway for gas from the interior of the disc towards its periphery and between two blocks.
  • FIG. 1 An embodiment of a surge arrester according to the invention is in Fig. 1 shown.
  • the surge arrester has two terminal blocks 2 at its opposite ends. Between these terminal blocks 2, a stack of varistor blocks 1 and, optionally, heat sinks / spacer blocks 3 are arranged.
  • a pressure relief arrangement 11 is provided, which below is described in detail. Distributed over the length of the surge arrester, a plurality of pressure relief arrangement may be present.
  • a plastic tape 15 is wound around the core.
  • the core with the plastic strip 15 is received in a shell 5.
  • this shell 5 is formed by wrapping the core with the plastic tape 15 with a preimpregnated material, such as a prepreg mat, which is then crosslinked at higher temperatures to the core.
  • a preimpregnated material such as a prepreg mat
  • Prepreg is a generic term for a glass fiber reinforced plastic material.
  • Prepregs offer one of the most precise ways to combine a reinforcing material with a resin matrix. This technology also makes it possible to combine the strongest and best matrix systems with all fiber types used in polymer composites today.
  • the so-prepared "module” is heated in an oven so that the plastic material of the prepreg liquefies and crosslinks with the outer surfaces of the blocks in the core.
  • the plastic strip 15 is chosen so that no crosslinking of the prepreg with the plastic strip 15 occurs. In addition, prevents the plastic strip 15 that during manufacture, liquefied plastic of the prepreg in the interstices between Varistorblöcken 1, terminal blocks 2 and heat sink / spacer blocks or penetrates into the pressure relief assembly 11 during manufacture.
  • This outer housing 7 may for example be formed of a heat-shrinkable material, as in the German utility model DE-U-75 31 935 or the British patent application GB-2073965-A is shown.
  • the outer housing 7 may also be formed from a mechanically releasable elastomeric material, which is relaxed on the sheath 5. According to a further alternative, the outer housing 7 can be cast or molded on site.
  • FIGS. 2 and 3 show in detail the pressure relief arrangement 11 of this surge arrester. How best in Fig. 3 can be seen, in a preferred embodiment, the pressure relief assembly 11 on a flat disc 11 ', for example, a 2 mm thick aluminum disc.
  • the disc 11 ' has the same diameter and outer shape as the varistor blocks 1, but is much thinner.
  • In the disc 11 'comb-like recesses or cutouts 13 are provided, which extend to each other in parallel and are open in one direction. These recesses form passageways extending from the interior of the disc to its periphery.
  • the number and width of the comb-like recesses is not relevant to the invention, as long as both a good electrical contact between the two blocks, the surface adjacent to the pressure relief arrangement, as well as a sufficiently good pressure discharge of the resulting inside the core gas is ensured.
  • Fig. 4 shows a longitudinal section through the core with plastic tape 15 and sheath 5 of a surge arrester according to the invention, showing in detail how two varistor blocks 1, with an intermediate pressure relief assembly 11 in the form of a disc 11 'are contained in the core.
  • Fig. 5 shows a section in the plane perpendicular to the representation Fig. 4 by the pressure relief arrangement 11.
  • sheath 5 of a prepreg material is wound around the entire core with varistor blocks 1, terminal blocks 2, heat sink blocks / spacer blocks 2 and pressure relief assembly 11, other plastic sheaths 5 may also be used for the core, for example in shape Shrink tubing or preformed plastic tubes in which the core is taken and poured.
  • the pressure relief assembly 11 is shown here in connection with a surge arrester without a spark gap, it can also be used in surge arresters, which in addition to a stack of varistor blocks 1 also have a spark gap.
  • surge arresters which in addition to a stack of varistor blocks 1 also have a spark gap.
  • Zinoxid varistor blocks other non-linear blocks, such as conventional silicon carbide varistor blocks, are possible.
  • the pressure relief assembly 11 of the preferred embodiment is designed as an aluminum disc 11 'with comb-like recesses.
  • other shapes are possible, such as star-shaped recesses or the like.
  • a passageway be formed from the interior of the core to its periphery, while at the same time maintaining good eclectic contact of the adjacent blocks. It is also possible not to open the passageways 13 completely to the periphery of the core, but to provide a thin occlusive edge which breaks open when pressure is developed inside.
  • a passageway for gas from the interior of the core to the core perimeter also means such a passageway opening only above a predetermined pressure or temperature.
  • the shell 5 and the outer housing 7 further layers may be provided in the surge arrester, such as an adhesive layer between the shell 5 and the outer housing 7. Also for thermal insulation of the outer housing 7 relative to the core and / or for dissipating heat additional layers can be incorporated from the core.
  • a plastic band 15 is provided at the abutting locations of adjacent blocks of the core and in the pressure relief assemblies, the invention is not limited thereto.
  • the entire core may be surrounded with such an adhesive tape, or the adhesive tape may be omitted altogether.
  • the shell 5 and / or the outer housing 7 may be provided at the pressure relief arrangement 11 corresponding points with additional predetermined breaking points, for example with perforations or partial perforations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP03704226A 2002-01-19 2003-01-17 Überspannungsableiter Expired - Lifetime EP1466334B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10201954 2002-01-19
DE10201954 2002-01-19
PCT/DE2003/000125 WO2003060926A2 (de) 2002-01-19 2003-01-17 Überspannungsableiter

Publications (2)

Publication Number Publication Date
EP1466334A2 EP1466334A2 (de) 2004-10-13
EP1466334B1 true EP1466334B1 (de) 2012-07-04

Family

ID=7712556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03704226A Expired - Lifetime EP1466334B1 (de) 2002-01-19 2003-01-17 Überspannungsableiter

Country Status (6)

Country Link
EP (1) EP1466334B1 (pl)
JP (1) JP2005515626A (pl)
BR (1) BR0302716A (pl)
DE (1) DE10241253B4 (pl)
PL (1) PL205709B1 (pl)
WO (1) WO2003060926A2 (pl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008090735A1 (ja) 2007-01-22 2008-07-31 Swcc Showa Cable Systems Co., Ltd. アレスタ

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913056A (en) * 1974-07-01 1975-10-14 Gen Electric Varistors with patterned electrodes
CH664642A5 (de) * 1984-04-13 1988-03-15 Bbc Brown Boveri & Cie Ueberspannungsableiter.
CH666574A5 (de) * 1984-06-01 1988-07-29 Bbc Brown Boveri & Cie Ueberspannungsableiter.
JPH02101702A (ja) * 1988-10-11 1990-04-13 Mitsubishi Electric Corp 避雷装置
JPH02203501A (ja) * 1989-02-01 1990-08-13 Otowa Denki Kogyo Kk 避雷器
JPH0520947A (ja) * 1991-07-12 1993-01-29 Meidensha Corp ポリマーがいし形避雷器
JP3372006B2 (ja) * 1995-05-17 2003-01-27 富士電機株式会社 酸化亜鉛形避雷器
DE19927940B4 (de) * 1999-06-18 2011-08-18 Tridelta Überspannungsableiter GmbH, 07629 Kunststoff-Überspannungsableiter in modularer Bauweise und Verfahren zu seiner Herstellung

Also Published As

Publication number Publication date
DE10241253A1 (de) 2003-07-31
PL205709B1 (pl) 2010-05-31
WO2003060926A2 (de) 2003-07-24
DE10241253B4 (de) 2008-04-24
EP1466334A2 (de) 2004-10-13
PL371196A1 (pl) 2005-06-13
BR0302716A (pt) 2004-03-30
JP2005515626A (ja) 2005-05-26
WO2003060926A3 (de) 2003-10-16

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