EP4062438A1 - Tulipe de contact à arc dotée de fentes optimisées par écoulement et caractéristique de décharge de contrainte intégrée - Google Patents

Tulipe de contact à arc dotée de fentes optimisées par écoulement et caractéristique de décharge de contrainte intégrée

Info

Publication number
EP4062438A1
EP4062438A1 EP20800695.7A EP20800695A EP4062438A1 EP 4062438 A1 EP4062438 A1 EP 4062438A1 EP 20800695 A EP20800695 A EP 20800695A EP 4062438 A1 EP4062438 A1 EP 4062438A1
Authority
EP
European Patent Office
Prior art keywords
slits
root
contact
slit
tulip
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
Application number
EP20800695.7A
Other languages
German (de)
English (en)
Inventor
Jakub Korbel
Timothy Sutherland
Mahesh DHOTRE
Robert Voss
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.)
Hitachi Energy Ltd
Original Assignee
Hitachi Energy Switzerland AG
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 Hitachi Energy Switzerland AG filed Critical Hitachi Energy Switzerland AG
Publication of EP4062438A1 publication Critical patent/EP4062438A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • H01H1/385—Contact arrangements for high voltage gas blast circuit breakers

Definitions

  • the disclosure relates to the field of electrical switching devices, for example load break switches or circuit breakers (CB), in particular for a high or medium voltage circuit breaker (HVCB, MVCB) with an arc-extinguishing capability.
  • load break switches or circuit breakers CB
  • HVCB high or medium voltage circuit breaker
  • MVCB medium voltage circuit breaker
  • tulip-type arcing contacts used in such load break switches and circuit breakers.
  • load break switches or circuit breakers in particular for a high or medium voltage circuit breaker (HVCB, MVCB)
  • HVCB high or medium voltage circuit breaker
  • MVCB medium voltage circuit breaker
  • the load break switch is opened or closed by a relative movement of contacts, e. g. a plug contact and a tulip-type contact. When the contacts are moved away from each other during a current-breaking operation, an electric arc may be formed between the separating contacts which may be also called “arcing-contacts”.
  • a compressed fluid e.g.
  • a gas may be used to extinguish an arc between the arcing contacts.
  • an electric conductivity of the medium between the arcing contacts may be sufficiently reduced to stop the current from flowing in the opposite direction after current zero (arc quenching).
  • the interrupting medium may be configured to regain sufficient dielectric strength to avoid breakdown and re-ignition of the electric arc, as the breaker must sustain the total voltage of the interrupted circuit (recovery). Both arc quenching and recovery must be successful to ensure a successful interruption.
  • This compressed fluid/gas may be provided by several ways.
  • a mechanism may be employed, called a puffer mechanism.
  • a quenching gas like e.g. SF6, is compressed in a puffer volume and re leased into an arcing region or arc quenching region.
  • Hot insulation gas has a lower insulation capability than the same insulation gas at a lower temperature. The hot gas increases a risk of a dielectric re-strike, even if the arc was successfully interrupted beforehand (i. e., even if a preceding thermal interruption was success ful). Therefore, cool gas with a sufficient pressure has to be directed to the arcing region.
  • the generated arc between arcing contacts evaporate a thin layer of an insulating material, which may surround the arcing region. This evaporation process, and the resulting gas/vapor, may cool the arc, cause a reduction in arc conductivity and improve the arc-quench ing properties.
  • Thermal radiation from the arc may cause ablation of e.g. a polytetrafluoroethylene (PTFE) vapor from a nozzle which may surround the arcing region, leading to flow from the high pressure arc zone to a heating volume. This may be known as back heating.
  • PTFE polytetrafluoroethylene
  • the arc may be said to be “ablation controlled” at this time.
  • the flow may be directed from the heating volume to the arc zone thereafter and the arc may be axially blown.
  • the arc may be extinguished at CZ.
  • tulip contacts are used as arcing contacts in medium and/or high voltage circuit breakers which are typically used for interrupting short circuit current when an electrical fault occurs.
  • the tulip type contact is advantageously configured to transmit or break or make short circuit current, in a range from at least 1 kA up to 300 kA.
  • a tulip contact may comprise multiple contact fingers for establishing and disconnecting an electrical contact with a mating contact, such as a corresponding plug.
  • the gap between the contact fingers may be considered as a “slit”.
  • the tulip contacts may be equipped with material which may be specifically heat resistant against the influence of the arc, e.g. Tungsten or its alloys.
  • Traditional arcing contact tulips have slits in order to accommodate mechanical and electrical contact with the plug contact. These slits contribute to gas-pressure build-up or gas- pressure loss in the arc zone.
  • the slits in the contact body of the tulip contact provide the mul- tiple contact fingers for establishing and disconnecting an electrical contact with a mating con tact (second arcing contact; plug contact).
  • Tulip slits in the contact body during high power test duties, get squeezed due to electromagnetic and quenching-gas pressure forces. This may happen at current peak. If the current approaches its natural zero (zero-crossing of the current sine-wave), these forces tend to be lower. The slits open again due to material elasticity (spring-force of the material).
  • the flow area in the tulip (slits area) may also have an influence on the pressure build-up. Closed slits advantageously contribute to the pressure build- up. This has been proven through tests. For better and stable interruption performance of the circuit breaker, it is therefore desired that opening and closing of the slits in the arcing tulip contact is defined and should not vary.
  • An object of the disclosure is therefore to provide an improved tulip contact which may improve a pressure behavior and therefore may have a better extinguishing capacity.
  • mechanical stability of the tulip contact may be improved by different measures which are described in the following.
  • a tulip contact for a power switch may comprise a rotationally symmetric contact body, having a first end and a second end.
  • the contact body may have a plurality of slits.
  • the slits may be arranged in the rota tionally symmetric contact body and may extend substantially parallel to a symmetrical axis of the symmetrical contact body of the tulip contact and may form “contact-fingers” in the rota tionally symmetric contact body.
  • the slits may define a length 1 between the first end of the slits and a root of the slits.
  • the length 1 of the slits is shorter than a length of the contact body.
  • the slits may have a first width at the first end and a second width at the root of the slits wherein the first width may be bigger than the second width.
  • a switchgear e.g. a gas insulated switch- gear for medium- or high voltage applications.
  • the switchgear is equipped with a tulip contact according to other aspects as disclosed.
  • a tulip contact in particular for a load breaker, comprising: a rotationally symmetric contact body, having a first end and a second end; the contact body having a plurality of slits, arranged in the body and extending par allel to a symmetrical axis of the body; the slits defining a length 1 between the first end and a root of the slits, wherein the length 1 of the slit is shorter than a length of the contact body; the slits having a first width at the first end and a second width at the root of the slits wherein the first width is bigger than the second width.
  • the slits in case the slits are compressed, the slits substantially and/or fully close.
  • the slits comprise a V-shaped form so that, in case the slits are compressed, the slits substantially and/or fully close in particular along the entire length 1 of the slits.
  • the root of one or more of the plurality of slits extends into a stress-relief element, the stress-relief element is configured to mitigate mechan ical stress in the material of the body in case the slits close.
  • the stress relief element is an opening in the form of a hole.
  • the stress relief element is a hook-shaped ex tension of the slit.
  • the slits taper in a direction from the first end to the root of the slit.
  • the slits narrow from the first width to the sec ond width in at least one discrete step.
  • the slits taper between the first width and the second width in a curved way.
  • the slits narrow in a step-shape manner with at least one step.
  • the form of the slits is a V-shaped form, extending from the first end of the tulip contact to the root of the slit.
  • the form of the slits is a diverging-shape, ex tending from the first end of the tulip contact to the root of the slit.
  • the form of the slits is a concavely-shaped form, extending from the first end of the tulip contact to the root of the slit.
  • the form of the slits is a convexly-shaped form, extending from the first end of the tulip contact to the root of the slit.
  • the form of the slits is a semi-straight shaped form, extending from the first end of the tulip contact to the root of the slit.
  • the object is further solved by an electrical switching device for medium- or high voltage applications, with a tulip contact as described before.
  • a dielectric insulation medium in particular a dielec- trie insulation gas, is present inside an enclosure of the electrical switching device; wherein the dielectric insulation medium comprises an organofluorine compound selected from a group: a fluoroether or a fluoroamine or a fluoroketone or mixtures thereof.
  • the mixtures comprise mixtures with a back ground gas.
  • the object is further solved by a method for manufacturing a tulip contact, comprising the steps of: providing a rotationally symmetric contact body, having a first end and a second end; and inserting a plurality of slits into the contact body, which slits extend parallel to a symmetrical axis of the body; wherein the slits defining a length 1 between the first end and a root of the slits, wherein the length 1 of the slit is shorter than a length of the contact body; the slits having a first width at the first end and a second width at the root of the slits wherein the first width is bigger than the second width, [0045] In a preferred implementation, in case the slits are compressed, the slits substantially and/or fully close.
  • the slits comprise a V-shaped form so that, in case the slits are compressed, the slits substantially and/or fully close in particular along the entire length 1 of the slits.
  • the method comprises the step of: Inserting a stress-relief element in which the root of one or more of the plurality of slits extends into and which is configured to mitigate mechanical stress in the material of the body in case the slits close.
  • the stress relief element is an opening in the form of a hole.
  • the stress relief element is a hook-shaped exten sion of the slit.
  • FIG. 1 shows a tulip contact according to prior art
  • FIG. 2 shows a tulip contact according to embodiments of the present application
  • FIG. 3 shows forms of slits for a tulip contact according to embodiments
  • FIG. 4 shows a slit with stress relief elements
  • FIG. 5 shows another tulip contact according to embodiments of the present application.
  • One of the aspects of the present application is to introduce an alternative and im proved form of the slits 110, 210 in the contact body 100 to control gas flow in the arcing zone.
  • a V-form of the slits, in particular a reversed V-shape, as introduced, may allow for a better, in particular a full closing along the entire length of the slits 110, 210.
  • FIG. 1 shows the effect of traditional slits 110 in a commonly used arrangement of slits 110 in a contact body 100 for a tulip contact.
  • the drawings on the left show that the slits from tip 120 to root 160 have a rectangular form, when no load is attached. That is there is zero- current through the contact and therefore no electromagnetic pinching forces.
  • the contact body may be hollow as can be seen, so that it may contain an arc extinguishing fluid/gas.
  • FIG. 1 The right side in FIG. 1 shows the contact body 100 of the tulip contact under load, symbolized by the arrows designated with “Current in” and “Current out”.
  • the slit 110 is closed at the tip 120 of the tulip, forming an elongated triangle with a base at its root 160, due to electromagnetic forces, caused by high current. That is, slit 110 remains open towards the root 160 of the slits. Building up a gas pressure will be difficult, since the gas leaves the contact body 100 through the partially opened slits 110, in particular at the broadening end part towards the root 160.
  • the material of the metallic contact-body 100 in particular in the area of the root 160, is exposed to mechanical bending forces which act against the electromagnetic closing forces due to the current. This may lead to increased fatigue of the material and breaking off of contact fingers from the contact body 100 which may lead to increased maintenance work.
  • a tulip contact 100 for a power switch is disclosed.
  • the tulip contact may comprise a rotationally symmetric contact body 100, having a first end 120 and a second end 130.
  • the tulip contact-body 100 is e.g. a hollow body of a conductive material which may additionally be configured to receive a plug contact as a second arcing contact.
  • the hollow body of the tulip contact 100 may be configured to receive and contain an arc extinguishing fluid during an arcing event.
  • the rotationally symmetric contact body 100 may have a plurality of slits 110, 210, 220.
  • the slits 110, 210, 220 may be arranged in the rotationally symmetric contact body 100.
  • the slits may extend substantially parallel to a symmetrical axis 140 of the rotationally sym metric contact body 100.
  • the slits 110, 210, 220 in the rotationally symmetric contact body may form “contact-fingers” which have a certain elasticity due to the used material.
  • the slits 110, 210, 220 may define a length 1 150 between the first end 120 of the rotationally symmetric contact body and a root 160 of the slits 110, 210, 220.
  • the length 1 150 of the slit(s) 110, 210, 220 may be shorter than a length of the rotationally symmetric contact body 100. This means that the slits 110, 210, 220 may have a length such that the rotationally symmetric contact body is not separated into a plurality of single parts.
  • slits 110, 210, 220 may have a first width 300 at the first end 120 of the rotationally symmetric contact body 100 and a second width 310 at the root 160 of the slits 110, 210, 220, wherein the first width 300 is bigger than the second width 310.
  • FIG. 2 shows the contact body 100 with an improved slit -shape (left FIGs A) in a “non-load” condition.
  • the newly introduced V-shaped slits 210 are in an “open” condition here.
  • the contact body 100 now has a closed, at least a nearly closed, surface along its axis 140 as can be seen in the right part of FIG. 2.
  • Quenching gas e.g. a ptfe vapor generated by an ablation process by the burning arc from a nozzle (not shown), within the hollow contact body 100, cannot flow through the slits or at least the flow is considerably reduced.
  • a pressure of the quenching gas in the (hollow) contact body 100 can build up which is higher than in the nor mally shaped slits (see FIG. 1).
  • a higher amount of quenching gas with an increased pressure can be directed towards the arcing zone (which is in the “current out” direction).
  • pressure at CZ current zero
  • pressure at CZ current zero
  • the quenching gas in the tulip may be e.g ptfe vapors which may be generated by ablation and vaporization of ptfe material surrounding the arcing zone (e.g. a nozzle made of ptfe).
  • the tulip contact presented here is suitable to be used in breakers with all known quenching gases, comprising e.g. C02, SF6, etc. and is not limited to quenching gas generated by ablation process.
  • the V-shaped slits 110, 210 and the stress relief element 400 may in crease the quenching gas flow area through the tulip throat and reduce flow over the surface of the contact body 100.
  • the stress relief elements 400 may have to be introduced in some cases in order to avoid fatigue failures.
  • the root 160 of one or more of the plurality of slits 110, 210, 220 may extend into a stress-relief element 400.
  • the stress- relief elements 400 may be configured to mitigate mechanical stress in the material of the con tact body 100 in case the slits 110, 210, 220 are compressed. In addition to the new shape of the slits 110, 210, this may lead to further increased slit-closing capability.
  • Finite element mechanical (FEM) analysis of the tulip shows a necessity of a stress relief element in the contact fingers to reduce stress in the material.
  • Mechanical stress may strongly be concentrated at the root 160 of the slit 110, 210. If a stress relief element is intro quizd, maximal stress may be significantly reduced and may not be longer concentrated at the root 160 of the slit. Reducing the stress at the root 160 not only may improve closing charac teristic of the slits 110, 210 in the contact body 100. It may also improve maintenance of load breakers, since contact fingers may not be prone to breaking due to mechanical fatigue. The presented solution therefore may reduce maintenance costs over time.
  • the stress relief elements 400 may be an opening in the form of a hole.
  • FIG. 4 exemplarily shows the V-shape slit, the root 160 of which extends continuously into hole 400.
  • the stress relief element 400 may be a hook shaped extension 500 of the slit(s) instead of a hole.
  • FIG. 5 shows this embodiment of a stress relief element. The hook-shaped stress relief element immediately follows the root 160 of the slit and forms a continuous path.
  • the hook shaped design may also reduce gas-turbulence inside the tulip by leaving base mate rial compared to the hole. This feature can be integrated with the V-shaped slits as well as with the variants in other embodiments which are described herein.
  • the hook-shaped stress relief element 500 leaves more material in the contact body. The area through which gas can leak is therefore minimized. At the same time, the stress on the material near the root 160 of the slit, when the slits are squeezed, is minimized in the same way as the stress relief element in the form of a hole 400 would provide.
  • a benefit of the feature of the hook-shaped stress relief element is that the length of the tulip slits may be restricted to a required or needed minimum length. This means that the hook-shaped stress relief element may further minimize the flow area through the slits 110, 210.
  • the roots 160 of the slits ideally should be as narrow as possible. Very thin tools or tools enabling very thin cuts may be used e.g. wire cutting, very fine cutting blades or industrial lasers may cut the respective slits into the contact body 100.
  • the slits 110, 210, 220 may taper in a direc tion from the first 120 end to the root 160 of the slit 110, 210, 220.
  • the width of the slits 110, 210, 220 may change continuously from the tip 120 of the rotationally symmetrical contact body of the tulip contact towards the root 160 of the slit(s) 110, 210, 220.
  • the slits 110, 210, 220 may narrow from the first width 300 to the second width 310 in at least one discrete step 320.
  • This variant of the V-shape slit is easy to manufacture and can be realized e.g. by cutting the slit with two saw blades of different thicknesses.
  • the form of the slits may be a V-shaped form 210, extending from the first end 120 of the tulip contact to the root 160 of the slit(s). The upper figure in FIG.
  • the slit 3 shows the basic idea of the slits, namely the V-shaped form of a slit.
  • the slit tapers continuously from the first width 300 to its root 160.
  • the V-shaped slit has its smallest width 310 at the root 160 of the slit.
  • the slits 110, 210, 220 may taper between the first width 120 and the second width 310 in a curved way.
  • the slits 110, 210, 220 may narrow in a step-shape manner with at least one step 320.
  • the slit is easy to manufacture, e.g. with a milling machine.
  • the form of the slits may be a diverging-shape 220, extending from the first end 120 of the tulip contact to the root 160 of the slit(s).
  • the form of the slits may be a concavely-shaped form 250, extending from the first end 120 of the tulip contact to the root 160 of the slit(s).
  • the form of the slits may be a convexly-shaped form 240, extending from the first end 120 of the tulip contact to the root (160) of the slit.
  • the form of the slits is a semi-straight shaped form 260, ex tending from the first end 120 of the tulip contact to the root 160 of the slit.
  • All different forms of the slits may have in common that they allow for a better clo sure in the tulip contact body due to completely closed slits by the current force. By this, the pressure build-up can be increased and scatter in thermal interruption performance can be re claimed.
  • V-shaped slits may also extend the arc erosion capability of the tulip.
  • an electrical switching device for medium- or high voltage applications with a tulip contact according to other embodiments is disclosed.
  • the electrical switching device for medium- or high voltage applications may be e.g. a gas-insulated switchgear for medium- or high voltage applications.
  • a dielectric insulation medium in particular a dielectric insulation gas, is present inside an enclosure of the electrical switching device.
  • the dielectric insulation medium may comprise an organofluorine compound.
  • the organofluorine compound may be selected from a group: a fluoroether or a fluoroamine or a fluoroketone or mixtures thereof.
  • the fluid used in the encapsulated or non-encapsulated electric apparatus can be SFe gas or any other dielectric insulation medium, may it be gaseous and/or liquid, and in particular can be a dielectric insulation gas or arc quenching gas.
  • dielectric insulation mediums can for example encompass media comprising an organofluorine compound, such an organofluo rine compound being selected from the group consisting of: a fluoroether, an oxirane, a fluoro amine, a fluoroketone, a fluoroolefm, a fluoronitrile, and mixtures and/or decomposition prod ucts thereof.
  • the terms “fluoroether”, “oxirane”, “fluoroamine”, “fluoroketone”, “fluo roolefm”, and “fluoronitrile” refer to at least partially fluorinated compounds.
  • fluoroether encompasses both fluoropolyethers (e.g. galden) and fluoromonoethers as well as both hydrofluoroethers and perfluoroethers
  • oxirane encompasses both hydrofluorooxiranes and perfluorooxiranes
  • fluoroamine encom passes both hydrofluoroamines and perfluoroamines
  • fluoroketone encompasses both hydrofluoroketones and perfluoroketones
  • fluoroolefm encompasses both hy- drofluoroolefins and perfluoroolefms
  • fluoronitrile encompasses both hydro- fluoronitriles and perfluoronitriles.
  • the dielectric insulation medium or more specifically the organoflu orine compound comprised in the dielectric insulation medium or gas is selected from the group consisting of: fluoroethers, in particular a or several hydrofluoromonoether(s); fluoroketones, in particular a or several perfluoroketone(s); fluoroolefms, in particular a or several hydrofluo- roolefm(s); fluoronitrile s, in particular a or several perfluoronitrile(s); and mixtures thereof.
  • fluoroketone as used in the context of the present disclosure may be interpreted broadly and may encompass both fluoromonoketones and fluorodiketones or generally fluoropolyketones. Explicity, more than a single carbonyl group flanked by carbon atoms may be present in the molecule. The term may also encompass both saturated compounds and unsaturated compounds including double and/or triple bonds between carbon atoms.
  • the at least partially fluorinated alkyl chain of the fluoroketones may be linear or branched and can optionally form a ring.
  • the dielectric insulation medium may comprise at least one compound being a fluoroketone, which may optionally comprise also heteroatoms incor porated into the carbon backbone of the molecules, such as at least one of: a nitrogen atom, oxygen atom and sulphur atom, replacing a corresponding number of carbon atoms.
  • the fluoromonoketone in particular perfluoroketone, can have from 3 to 15 or from 4 to 12 carbon atoms and particularly from 5 to 9 carbon atoms. Most advantageously, it may comprise exactly 5 carbon atoms and/or exactly 6 carbon atoms and/or exactly 7 carbon atoms and/or exactly 8 carbon atoms.
  • the dielectric insulation medium comprises at least one compound being a hydrofluoroether selected from the group consisting of: hydrofluoro monoether con taining at least three carbon atoms; hydrofluoro monoether containing exactly three or exactly four carbon atoms; hydrofluoro monoether having a ratio of the number of fluorine atoms to the total number of fluorine and hydrogen atoms of at least 5:8; hydrofluoro monoether having a ratio of the number of fluorine atoms to the number of carbon atoms ranging from 1.5:1 to 2:1; pentafluoro-ethyl-methyl ether; 2,2,2-trifluoroethyl-trifluoromethyl ether; and mixtures thereof.
  • hydrofluoroether selected from the group consisting of: hydrofluoro monoether con taining at least three carbon atoms; hydrofluoro monoether containing exactly three or exactly four carbon atoms; hydrofluoro monoether having a ratio of the number of fluorine atom
  • the dielectric insulation medium comprises at least one compound being a fluoroolefm selected from the group consisting of: hydrofluoroolefms (HFO) comprising at least three carbon atoms, hydrofluoroolefms (HFO) comprising exactly three carbon at oms, trans-l,3,3,3-tetrafluoro-l-propene (HFO-1234ze), 2,3,3,3-tetrafluoro-l-propene (HFO- 1234yf), trans-1,2,3,3,3 pentafluoroprop-l-ene (HFO-1225ye (E-isomer)), cis-1,2,3,3,3 pen- tafluoroprop-l-ene (HFO-1225ye (Z-isomer)), and mixtures thereof.
  • HFO hydrofluoroolefms
  • HFO hydrofluoroolefms
  • HFO hydrofluoroolefms
  • HFO hydrofluoroole
  • the organofluorine compound can also be a fluoronitrile, in partic ular a perfluoronitrile.
  • the organofluorine compound can be a fluoronitrile, spe cifically a perfluoronitrile, containing two carbon atoms, and/or three carbon atoms, and/or four carbon atoms.
  • the fluoronitrile can be a perfluoroalkylnitrile, specifically per- fluoroacetonitrile, perfluoropropionitrile (C2F5CN) and/or perfluorobutyronitrile (C3F7CN).
  • the fluoronitrile can be perfluoroisobutyronitrile (according to the formula (CF3)2CFCN) and/or perfluoro-2-methoxypropanenitrile (according to formula CF 3 CF(OCF 3 )CN).
  • perfluoroisobutyronitrile is particularly preferred due to its low toxicity.
  • the mixtures of gases according to another embodiment may comprise mixtures with a background gas.
  • the background gas or carrier gas may be different from the organofluorine com pound (in particular different from the fluoroether, the oxirane, the fluoroamine, the fluoro- ketone, the fluoroolefm and the fluoronitrile) and can in embodiments be selected from the group consisting of: air, N2, O2, CO2, a noble gas, FF; NO2, NO, N2O; fluorocarbons and in particular perfluorocarbons, such as CF4; CF3I, SFe; and mixtures thereof.
  • a self-blast or puffer circuit breaker with a tulip contact according to one or more other embodiments, is disclosed.
  • the present application discloses a novel and improved tulip contact for a breaker assembly, in particular an arcing tulip contact.
  • the tulip contact advantageously has a rotation symmetrical body.
  • the body of the tulip arcing-contact is hollow, forming a hollow volume.
  • a novel form of slits is introduced which allows for keeping a gas pressure of quench ing gas in the hollow volume of the tulip contact at a high level as long as possible to support the arc extinguishing process.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
  • Contacts (AREA)

Abstract

La présente invention concerne un contact tulipe pour un commutateur de puissance comprenant un corps de contact symétrique en rotation (100) ayant une première extrémité (120) et une seconde extrémité (130), et une pluralité de fentes (210, 220). Les fentes sont disposées dans le corps et s'étendent parallèlement à un axe symétrique (140) du corps. Les fentes définissent une longueur entre la première extrémité et une racine des fentes, la longueur de la fente étant plus courte qu'une longueur du corps de contact (100). Les fentes ont une première largeur au niveau de la première extrémité (120) et une seconde largeur au niveau de la racine des fentes, la première largeur étant supérieure à la seconde largeur. Une extension en forme de crochet (500) de la fente réduit la turbulence de gaz à l'intérieur du contact tulipe et fournit un relâchement de contrainte.
EP20800695.7A 2019-11-22 2020-11-09 Tulipe de contact à arc dotée de fentes optimisées par écoulement et caractéristique de décharge de contrainte intégrée Pending EP4062438A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19210974.2A EP3826042B1 (fr) 2019-11-22 2019-11-22 Contact tulipe d'amorçage d'arc avec fentes de flux optimisé et fonctionnalité de détente de contraintes intégrée
PCT/EP2020/081518 WO2021099166A1 (fr) 2019-11-22 2020-11-09 Tulipe de contact à arc dotée de fentes optimisées par écoulement et caractéristique de décharge de contrainte intégrée

Publications (1)

Publication Number Publication Date
EP4062438A1 true EP4062438A1 (fr) 2022-09-28

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP19210974.2A Active EP3826042B1 (fr) 2019-11-22 2019-11-22 Contact tulipe d'amorçage d'arc avec fentes de flux optimisé et fonctionnalité de détente de contraintes intégrée
EP20800695.7A Pending EP4062438A1 (fr) 2019-11-22 2020-11-09 Tulipe de contact à arc dotée de fentes optimisées par écoulement et caractéristique de décharge de contrainte intégrée

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Application Number Title Priority Date Filing Date
EP19210974.2A Active EP3826042B1 (fr) 2019-11-22 2019-11-22 Contact tulipe d'amorçage d'arc avec fentes de flux optimisé et fonctionnalité de détente de contraintes intégrée

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EP (2) EP3826042B1 (fr)
JP (1) JP7350175B2 (fr)
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DE1938698U (de) * 1966-03-18 1966-05-18 Calor Emag Elektrizitaets Ag Kontaktanordnung.
DE3829877A1 (de) * 1988-09-02 1990-03-15 Duerrwaechter E Dr Doduco Ringkontaktstueck fuer mittel- und hochspannungsschalter
JPH1012075A (ja) * 1996-06-18 1998-01-16 Takaoka Electric Mfg Co Ltd チューリップ形接触子
JP2001243859A (ja) * 2000-03-01 2001-09-07 Mitsubishi Electric Corp パッファ形ガス遮断器
DE202015106610U1 (de) * 2015-12-04 2016-01-11 Abb Technology Ag Kontakttulpe für einen gasisolierten Hochspannungsschalter und Hochspannungsschalter mit dieser Kontakttulpe
EP3404679B1 (fr) * 2017-05-18 2021-12-01 General Electric Technology GmbH Contact électrique de type tulipe comprenant un élément de pression sur les doigts conducteurs au repos

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WO2021099166A1 (fr) 2021-05-27
CN115136271A (zh) 2022-09-30
JP7350175B2 (ja) 2023-09-25
EP3826042A1 (fr) 2021-05-26
JP2023502718A (ja) 2023-01-25
EP3826042B1 (fr) 2024-04-03

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