EP3782174A1 - Überspannungsableiter mit druckentlastungsvorrichtung - Google Patents
Überspannungsableiter mit druckentlastungsvorrichtungInfo
- Publication number
- EP3782174A1 EP3782174A1 EP19729683.3A EP19729683A EP3782174A1 EP 3782174 A1 EP3782174 A1 EP 3782174A1 EP 19729683 A EP19729683 A EP 19729683A EP 3782174 A1 EP3782174 A1 EP 3782174A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- surge arrester
- cover
- sealant
- pressure relief
- 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.)
- Pending
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; Arresters
- H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
- H01C1/024—Housing; Enclosing; Embedding; Filling the housing or enclosure the housing or enclosure being hermetically sealed
Definitions
- the invention relates to a surge arrester according to the preamble of claim 1.
- Surge arresters are used in the medium-voltage and high-voltage range to safely discharge so-called overvoltages, i.e. voltages far above the nominal voltages provided during operation. This will damage equipment such as Avoided transformers.
- a surge arrester for high voltage can be arranged on an overhead line and lead to impermissibly high currents to earth in the event of a lightning strike or short circuit.
- Surge arresters usually contain so-called varistors, i.e. electrical resistors, the electrical resistance of which is very high up to a design-related threshold voltage and greatly reduced above the threshold voltage, so that the surge arrester becomes a good electrical conductor.
- varistors i.e. electrical resistors
- These resistors are therefore often referred to as so-called “varistors” (from “variable resistors”).
- Disc-shaped metal oxide resistors are arranged one above the other in a housing and connected to the high-voltage potential and the ground potential at the respective ends of the housing.
- the surge arrester is normally hardly conductive, so that only a small leakage current flows to earth. In the event of a fault, however, a high leakage current flows.
- Plug-in conductor types are known in the prior art which have a conically shaped end which is used for insertion into a receiving device.
- a receiving device can be seen, for example, on a gas-insulated switchgear (GIS).
- GIS gas-insulated switchgear
- Such a plug-in arrester is particularly easy to install at the place of use, since it only needs to be device must be inserted and flanged.
- the varistors are often surrounded with silicone for insulation, leaving a cavity to the outer housing.
- a stack of disk-shaped resistors is inserted into a prefabricated silicon body. The cavity is usually filled with air.
- Plug-in arresters create an arc between the high-voltage parts and the earth potential. This creates a high pressure build-up inside the arrester.
- a pressure relief device is necessary at the end of the drain which faces away from the conical end. This Druckentlastungsvorrich device must therefore be able to open in time when pressure builds up to ensure a pressure reduction inside the drain ge.
- the pressure relief device must shut off the arrester in normal operation and keep it sealed from the environment.
- a known solution is to slide a plastic cap over the relevant end of the plug conductor and to fix and seal it using an adhesive. In the event of a short circuit, the cap is torn.
- the invention solves this problem by one
- the surge arrester according to the invention has the advantage that it is easy to manufacture, which saves time and money.
- the cover can simply be pushed onto the tubular housing. This immediately results in the cover being clamped, which essentially are sealed fluid-tight. Special tools for assembly or adhesives are not necessary.
- the cover can simply be pushed onto the tubular housing. This immediately results in the cover being clamped, which essentially are sealed fluid-tight. Special tools for assembly or adhesives are not necessary.
- the cover can simply be pushed onto the tubular housing. This immediately results in the cover being clamped, which essentially are sealed fluid-tight. Special tools for assembly or adhesives are not necessary.
- Plug-in arresters can be easily opened again without destroying them, for example for maintenance or visual inspection of the interior.
- the lid or cap can be removed easily and non-destructively, e.g. by levering out with a slotted screwdriver.
- the housing can e.g. tubular and e.g. be made of metal.
- Another advantage is a guaranteed pressure relief effect by giving in or opening in the event of pressure building up in the event of a short circuit, because the cover is blown off and / or can tear. It is also possible to break the lid.
- the cover has a recess in which a sealant is arranged.
- the recess is designed, for example, as a groove that e.g. has an egg-shaped or rectangular cross section.
- the recess is advantageous because it prevents the sealant from slipping.
- the sealing means has an elastic plastic. This is an advantage because a good clamping effect and additional good sealing can be achieved by the elastic plastic.
- the sealant is compressed a little, which makes it possible to push it in. Due to this pressing force, the lid holds e.g. in the arrester housing.
- the sealing means has a 0-ring. This is an advantage because so-called O-rings are widely used in technology as ring-shaped seals. 0- Rings are long-lasting, inexpensive and available in many designs on the market.
- the housing has a corresponding bonding recess for receiving the sealant.
- the housing has a tapering, which makes it easier to slide the cover on.
- a taper in the sense of the invention means that a component - in this case towards the end of the arrester - is reduced in its cross section, for example in the manner of a truncated cone.
- the housing can, for example, be made thinner at the outermost edge than in the rest of the length of the arrester.
- the cover has a taper, which makes it easier to slide the cover onto the housing. By chamfering the cover of the arrester, it can be easier to attach it to the arrester.
- the cover is designed to rest at least partially on an inside of the tubular housing Ge.
- the cover in cross section has a smaller or the same diameter in comparison with the housing. This is an advantage because there is no protruding edge through the lid. This prevents accidental stripping of the cover when working near the surge arrester.
- the cover is designed to rest at least partially on an outside of the tubular housing Ge.
- the cover has a larger cross section than the housing.
- Figure 1 shows a first embodiment of an invent
- FIG. 2 is a detailed view of the surge arrester according to the first embodiment
- Figure 3 is a detailed view of a second embodiment example of a surge arrester according to the invention.
- Figure 1 shows a surge arrester 1 with a Ge housing 9, which is tubular.
- a first end 14 of the surge arrester 1 is provided with a plug device 3, 4.
- a second end 13 of the surge arrester 1 is provided with a pressure relief device 12.
- the first end 14 has a high-voltage contact 4 and a plug-in sleeve 3, which forms a conical plug-in part of the surge arrester 1.
- the receptacle 3 has flanges at one end which, after inserting the surge arrester 1 into a receptacle (not shown), for example a gas-insulated switchgear, are used for flanges.
- the high-voltage contact 4 leads to a first end fitting 5.
- the first end fitting 5 and a second end fitting 10 press together a column of electrical resistors 7, the so-called varistors.
- the end fitting 10 is Nem fastener 11 guided to the tubular housing 9 made of metal.
- the two end fittings 5, 10, the electrical resistors 7 and part of the high-voltage contact 4 are embedded in an insulating jacket 6.
- the insulating jacket 6 is made of silicone, for example. Between the Ge housing 9 and the insulating jacket 6 is inside the
- Surge arrester 1 formed a cavity 8. If there is a malfunction of the surge arrester 1 with arcing and corresponding pressure build-up inside, the pressure relief device 12 can release this pressure to the environment. In this way, hazards to equipment and people can be greatly reduced.
- the pressure relief device has a cover 12.
- the cover 12 is fixed in a fluid-tight manner to the housing 9 by means of a clamping action, where the clamping action is dimensioned such that if the surge arrester 1 malfunctions, pressure build-up in the housing 9 overcomes the clamping action and a fluid-conducting connection is created from the interior 8 of the housing to the surroundings , A fluid-conducting connection is achieved, for example, by a crack in the cover 12 or by a detachment of the cover 12 from the housing 9.
- FIG. 2 shows a detailed view of the cover 12 in the connec tion area to the housing 9.
- the housing 9 is tubular, so that the cross section of the cover 12 shown is substantially rotationally symmetrical.
- the cover 12 has a step 21 which forms a clamping lip 20 leading into the inside of the arrester.
- the clamping lip 20 has a taper 17 and a recess 19.
- the recess 19 is designed to accommodate a sealant 15 formed as an O-ring made of elastic plastic.
- the housing 9 has a shape adapted to the clamping lip 20.
- the housing 9 therefore forms an outwardly tapering region 16, which correspondingly follows the course of the taper 17 of the sealing lip 20 in cross section.
- the housing 9 has a corresponding recess 18 in which the sealant 15 comes to rest.
- the cross section of the cover 12 is somewhat smaller than the diameter of the housing 9, so that it is at the second end 13 of the
- Surge arrester 1 has no protruding edge.
- the exemplary embodiment shown has the advantage that, when the surge arrester 1 is installed, the cover 12 with an inserted O-ring 15 can be inserted very easily by manual pressure over the tapered region 16 of the housing until the sealant 15 in the recess 18 of the housing comes to rest and thereby locks the lid 12. A strong clamping effect is created by the sealant 15, which is deformed in the recesses 18, 19 and thereby forms a fluid-tight seal.
- FIG. 3 shows a second embodiment of the inven tion.
- the cover 30 has a larger cross section than the diameter of the housing 32.
- a sealing lip 37 lies on the outside of the housing 32.
- the sealing lip 37 has a tapered area 33 and a recess 36.
- the housing 32 has a corresponding recess 35 and a tapered area 34.
- a sealant 31 is placed, which in turn is designed as an O-ring.
- the cover 30 is pushed onto the surge conductor 1 in such a way that it is pushed over the outermost edge of the housing 32 and thus comes to lie on the outside of the surge arrester 1.
- a particularly simple manual production is given, since only the cover 30 with the sealant 31 inserted has to be pushed over the housing 32.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
- Gas-Insulated Switchgears (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018209696 | 2018-06-15 | ||
| PCT/EP2019/064325 WO2019238453A1 (de) | 2018-06-15 | 2019-06-03 | Überspannungsableiter mit druckentlastungsvorrichtung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3782174A1 true EP3782174A1 (de) | 2021-02-24 |
Family
ID=66821214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19729683.3A Pending EP3782174A1 (de) | 2018-06-15 | 2019-06-03 | Überspannungsableiter mit druckentlastungsvorrichtung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3782174A1 (de) |
| KR (1) | KR102438378B1 (de) |
| CN (1) | CN112368789B (de) |
| WO (1) | WO2019238453A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4060687B1 (de) | 2021-03-18 | 2025-07-23 | Hitachi Energy Ltd | Überspannungsschutz |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4463405A (en) * | 1981-02-19 | 1984-07-31 | Electric Power Research Institute, Inc. | Fail safe surge arrester |
| JPS63208202A (ja) * | 1987-02-25 | 1988-08-29 | 三菱電機株式会社 | 避雷装置 |
| DE102007051854B4 (de) * | 2006-11-09 | 2017-05-04 | Dehn + Söhne Gmbh + Co. Kg | Überspannungsableiter mit einem Gehäuse und mit mindestens einem Ableitelement |
| DE102012217310A1 (de) * | 2012-09-25 | 2014-03-27 | Siemens Aktiengesellschaft | Überspannungsableiter |
| CN203659558U (zh) * | 2014-01-22 | 2014-06-18 | 泰科电子(上海)有限公司 | 避雷器 |
-
2019
- 2019-06-03 EP EP19729683.3A patent/EP3782174A1/de active Pending
- 2019-06-03 WO PCT/EP2019/064325 patent/WO2019238453A1/de not_active Ceased
- 2019-06-03 CN CN201980039955.9A patent/CN112368789B/zh active Active
- 2019-06-03 KR KR1020217000906A patent/KR102438378B1/ko active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112368789A (zh) | 2021-02-12 |
| KR20210019088A (ko) | 2021-02-19 |
| WO2019238453A1 (de) | 2019-12-19 |
| KR102438378B1 (ko) | 2022-08-31 |
| CN112368789B (zh) | 2022-07-29 |
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Legal Events
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