EP1410407A2 - Überspannungsableiter zum einsatz in energieübertragungsnetzen - Google Patents
Überspannungsableiter zum einsatz in energieübertragungsnetzenInfo
- Publication number
- EP1410407A2 EP1410407A2 EP02753027A EP02753027A EP1410407A2 EP 1410407 A2 EP1410407 A2 EP 1410407A2 EP 02753027 A EP02753027 A EP 02753027A EP 02753027 A EP02753027 A EP 02753027A EP 1410407 A2 EP1410407 A2 EP 1410407A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- varistor
- surge arrester
- varistor block
- block
- 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
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
-
- 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 for use in energy transmission networks with a leakage current path which has at least one varistor block, the varistor block having two contact areas and a jacket area.
- a surge arrester of this type a plurality of varistor blocks forming the discharge current path of the surge arrester are arranged one behind the other and clamped between two end fittings.
- Surge arresters of this type are used in energy transmission networks of different voltage levels.
- An insulating material housing is arranged between the end fittings, surrounding the varistor blocks on the casing side.
- the varistor blocks are wrapped with non-conductive fibers. - Internal faults of such varistor blocks can lead to arcing.
- Openings are provided between the non-conductive fibers in order to allow the hot gases generated by the ignition of the arc to emerge from the inside of the surge arrester.
- the non-conductive fibers hold the varistor blocks together mechanically, so that the fragments that occur in the event of an error when the varistor blocks burst are held together (EP 0 335 480 A2).
- the present invention is based on the object of designing a surge arrester of the type mentioned at the outset in such a way that the risk of the varistor blocks bursting in the event of an error occurring is reduced. This object is achieved in that in at least one
- a portion of the jacket area of the at least one varistor block is provided with a coating which serves to initiate an electrical flashover when a critical temperature of the varistor block is exceeded.
- the coating provided according to the invention prevents a breakdown in the interior of the varistor block by early ignition of an arc in the jacket region. This significantly reduces the risk of the varistor block splintering.
- a thermistor material can advantageously be used as the material for the coating. At the critical temperature of the varistor blocks, such a material reduces its electrical resistance to such an extent that the flashover resistance of the arrester path is undershot and an electrical flashover is initiated.
- Such a thermistor material can be manufactured using the same manufacturing measures as are customary in the manufacture of varistor blocks, namely sintering and glazing. The application of the coating can therefore be easily integrated into the production steps customary for the production of varistor blocks.
- a conductive path is generated from ionized gas. This conductive path is used to initiate an electrical flashover of the cladding area of the varistor block. The conductive path immediately initiates an arc outside the varistor block.
- the use of a pyrotechnic substance to form the coating represents a particularly reliable design variant. With regard to the layer material, one can fall back on commercially available pyrotechnic substances based on nitrocellulose.
- Pyrotechnic substances based on nitrocellulose can be easily applied to the cladding area of a varistor block.
- a paste-like solution of nitrocellulose in acetone is suitable for applying the coating.
- the solvent evaporates after application and the nitrocellulose is sufficiently permanently fixed on the outer surface.
- the ignition temperature of nitrocellulose corresponds approximately to the critical temperature of the varistor blocks, so that the desired external flashover occurs before the varistor blocks are overloaded. Nitrocellulose can also be obtained inexpensively.
- An advantageous embodiment of the invention provides that the coating - regardless of the material selected in each case - extends along a surface line of at least one varistor block.
- the layer can be applied to the outer surface of the varistor blocks or embedded in a groove. If a groove is provided in the casing area in which the coating is arranged, it is possible to assign the coating to a varistor block without changing its outer contour.
- a coating extending along a surface line detects several varistor blocks arranged one behind the other. each individual varistor block, so that regardless of which varistor block there is a fault, a fast one
- the protective measure becomes effective.
- the layer has an annular shape.
- An annular layer can optionally also be combined with a layer running along a surface line. - However, an annular arrangement of the layer results in a higher consumption of coating material. In the extreme case, the entire lateral surface of a varistor block can be coated.
- FIG. 1 shows a section through a surge arrester with a layer running along a surface line
- FIG. 2 shows a section through a surge arrester with several layers running in a ring around the leakage current path
- FIG. 3 shows a view of a single varistor block with a groove.
- the surge arrester 1 shown in section in FIG. 1 has a first end fitting 2 and a second end fitting 3. Between the end fittings 2 and 3 is a leakage current path consisting of three varistor blocks 4a, 4b, 4c arranged. For electrical contacting and mechanical
- a first connection bolt 5 is arranged on the first end fitting and a second connection bolt 6 is arranged on the second end fitting.
- the three varistor blocks 4a, 4b, 4c are clamped with insulating rods 7 for mechanical stabilization.
- the surge arrester 1 has an insulating material housing 8.
- a coating 9 made of a material is arranged along a surface line of the varistor blocks 4a, 4b, 4c and is used to initiate an electrical flashover when a critical temperature of the varistor blocks is exceeded.
- the coating 9 can consist, for example, of a thermally conductive material or a pyrotechnic substance. The mode of operation of the coating 9 is to be explained using a configuration variant of the layer as a pyrotechnic coating.
- the varistor blocks are heated due to a fault current flowing through the leakage current path.
- a critical temperature of approximately 200 ° C. the coating 9 ignites and ionized gas is produced.
- This ionized gas now forms a conductive path between the first end fitting and the second end fitting.
- An arc arises immediately due to the high potential difference between the two end fittings. This arc burns outside the varistor blocks 4a, 4b, 4c, • a breakdown inside the varistor blocks 4a, 4b, 4c is prevented in this way.
- the gas overpressure generated by the burning arc inside the surge arrester 1 can be reduced by a corresponding bursting of the insulating material housing 8.
- the surge arrester 1 a according to FIG. 2 basically has the same structure as the surge arrester 1 shown in FIG. 1.
- the pyrotechnic substance can be applied in different variants. As already mentioned, the pyrotechnic substance can be used as a paste-like solution. In the present case, the pyrotechnic substance is wound onto the respective varistor block in the form of a band-like structure.
- a single varistor block 4d is provided with a groove 10 along a surface line. This groove can be filled with the material which serves to initiate an electrical flashover when a critical temperature is exceeded.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10136617A DE10136617C1 (de) | 2001-07-17 | 2001-07-17 | Überspannungsableiter zum Einsatz in Energieübertragungsnetzen |
DE10136617 | 2001-07-17 | ||
PCT/DE2002/002636 WO2003009310A2 (de) | 2001-07-17 | 2002-07-16 | Überspannungsableiter zum einsatz in energieübertragungsnetzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1410407A2 true EP1410407A2 (de) | 2004-04-21 |
EP1410407B1 EP1410407B1 (de) | 2005-05-04 |
Family
ID=7693294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02753027A Expired - Lifetime EP1410407B1 (de) | 2001-07-17 | 2002-07-16 | Überspannungsableiter zum einsatz in energieübertragungsnetzen |
Country Status (8)
Country | Link |
---|---|
US (1) | US7120001B2 (de) |
EP (1) | EP1410407B1 (de) |
JP (1) | JP2004535683A (de) |
CN (1) | CN1326161C (de) |
BR (1) | BRPI0211168B1 (de) |
DE (2) | DE10136617C1 (de) |
RU (1) | RU2292096C2 (de) |
WO (1) | WO2003009310A2 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10146947C5 (de) * | 2001-09-24 | 2009-10-08 | Epcos Ag | Elektrisches Bauelement |
KR100973058B1 (ko) * | 2008-04-23 | 2010-07-29 | 한국세라믹기술원 | 써미스터-바리스터 복합칩 소자 및 그 제조방법 |
SI23040B (en) * | 2009-04-29 | 2018-06-29 | Crdce D.O.O. | A varistor with a defined weak point in the structure |
DE102009053145A1 (de) * | 2009-11-05 | 2011-05-12 | Phoenix Contact Gmbh & Co. Kg | Überspannungsschutzelement |
RU2705203C1 (ru) * | 2016-09-28 | 2019-11-06 | Абб Швайц Аг | Импульсный разрядник и способ его изготовления |
DE102017221783A1 (de) * | 2017-12-04 | 2019-06-06 | Siemens Aktiengesellschaft | Anordnung und Verfahren zum Schalten hoher Spannungen mit einer Schalteinrichtung und genau einem Widerstandsstapel |
EP3505943B1 (de) * | 2017-12-29 | 2020-05-20 | Siemens Aktiengesellschaft | Nachweisen einer elektrischen überspannung |
CN112071534A (zh) * | 2020-09-03 | 2020-12-11 | 合肥众甫工业技术有限公司 | 一种基于波纹管缓冲组件的过电压保护器 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0159820B1 (de) * | 1984-03-29 | 1988-12-07 | Kabushiki Kaisha Toshiba | Zink-Oxidspannungsabhängiger, nichtlinearer Widerstand |
US4656555A (en) * | 1984-12-14 | 1987-04-07 | Harvey Hubbell Incorporated | Filament wrapped electrical assemblies and method of making same |
FR2611974B1 (fr) * | 1987-03-04 | 1993-09-24 | Pendar Electronique | Composition de revetement des electrodes d'un parafoudre |
CA1334990C (en) * | 1988-03-31 | 1995-03-28 | John D. Sakich | Modular electrical assemblies with pressure relief |
US5565838A (en) * | 1992-05-28 | 1996-10-15 | Avx Corporation | Varistors with sputtered terminations |
CN1046589C (zh) * | 1995-01-24 | 1999-11-17 | 深圳宝安银星电力电子公司 | 金属氧化物避雷器 |
US5721664A (en) * | 1996-12-16 | 1998-02-24 | Raychem Corporation | Surge arrester |
US6392861B1 (en) * | 1999-09-15 | 2002-05-21 | Joslyn Manufacturing Co. | Surge arrester having disconnector housed by mounting bracket and end cap |
DE10000617A1 (de) * | 2000-01-10 | 2001-07-12 | Abb Hochspannungstechnik Ag | Ueberspannungsableiter |
US6778374B2 (en) * | 2002-01-04 | 2004-08-17 | Hubbell Incorporated | Reinforced arrester housing |
-
2001
- 2001-07-17 DE DE10136617A patent/DE10136617C1/de not_active Expired - Fee Related
-
2002
- 2002-07-16 DE DE50203021T patent/DE50203021D1/de not_active Expired - Lifetime
- 2002-07-16 US US10/484,103 patent/US7120001B2/en not_active Expired - Fee Related
- 2002-07-16 JP JP2003514567A patent/JP2004535683A/ja active Pending
- 2002-07-16 CN CNB028119819A patent/CN1326161C/zh not_active Expired - Fee Related
- 2002-07-16 WO PCT/DE2002/002636 patent/WO2003009310A2/de active IP Right Grant
- 2002-07-16 RU RU2004104458/09A patent/RU2292096C2/ru not_active IP Right Cessation
- 2002-07-16 BR BRPI0211168A patent/BRPI0211168B1/pt not_active IP Right Cessation
- 2002-07-16 EP EP02753027A patent/EP1410407B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03009310A2 * |
Also Published As
Publication number | Publication date |
---|---|
BRPI0211168B1 (pt) | 2016-01-05 |
US20040207969A1 (en) | 2004-10-21 |
US7120001B2 (en) | 2006-10-10 |
JP2004535683A (ja) | 2004-11-25 |
DE10136617C1 (de) | 2002-10-10 |
CN1528001A (zh) | 2004-09-08 |
DE50203021D1 (de) | 2005-06-09 |
RU2004104458A (ru) | 2005-07-10 |
RU2292096C2 (ru) | 2007-01-20 |
CN1326161C (zh) | 2007-07-11 |
WO2003009310A2 (de) | 2003-01-30 |
EP1410407B1 (de) | 2005-05-04 |
WO2003009310A3 (de) | 2003-08-07 |
BR0211168A (pt) | 2004-08-10 |
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