EP2774159B1 - Elektrogerät mit vorrichtung zur begrenzung der bildung eines lichtbogens - Google Patents

Elektrogerät mit vorrichtung zur begrenzung der bildung eines lichtbogens Download PDF

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Publication number
EP2774159B1
EP2774159B1 EP12779073.1A EP12779073A EP2774159B1 EP 2774159 B1 EP2774159 B1 EP 2774159B1 EP 12779073 A EP12779073 A EP 12779073A EP 2774159 B1 EP2774159 B1 EP 2774159B1
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EP
European Patent Office
Prior art keywords
contact
switchgear
rod
upstream
corona
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.)
Active
Application number
EP12779073.1A
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English (en)
French (fr)
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EP2774159A1 (de
Inventor
Guilhem Blanchet
Bernard Gelloz
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.)
General Electric Technology GmbH
Original Assignee
Alstom Technology AG
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Filing date
Publication date
Application filed by Alstom Technology AG filed Critical Alstom Technology AG
Publication of EP2774159A1 publication Critical patent/EP2774159A1/de
Application granted granted Critical
Publication of EP2774159B1 publication Critical patent/EP2774159B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
    • H01H33/245—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring using movable field electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/64—Protective enclosures, baffle plates, or screens for contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/045—Means for extinguishing or preventing arc between current-carrying parts for arcs formed during closing

Definitions

  • the invention provides an electrical apparatus for a high voltage electrical power transmission line, such as an earthing switch, a disconnector or a circuit breaker, including means for delaying the moment of appearance of an arc. during a closing phase of the electrical equipment and to limit the duration of such an arc during a closing phase or opening of the electrical equipment.
  • a high voltage electrical power transmission line such as an earthing switch, a disconnector or a circuit breaker
  • An electrical apparatus for a high-voltage electrical power transmission line such as, for example, an earthing switch (MALT) for a high voltage transmission line is a security device which aims to establish a connection between live parts, which may be at a certain electrical potential whose value varies from volts to kilovolt, and the earth which is at an electrical potential considered as zero.
  • MALT earthing switch
  • the electrical equipment comprises a fixed contact and a movable contact, which are able to be brought into contact or to be separated, according to whether one wants to establish or not an electrical connection between the two parts under tension.
  • the fixed contact is electrically connected to the live parts and the movable contact is electrically connected to the ground which is at zero potential.
  • the fixed contact and the movable contact are each electrically connected to the live parts of the apparatus.
  • the equipment also comprises a closed enclosure in which the fixed and mobile contacts are received, and the enclosure is filled with an electrically insulating gas such as for example sulfur hexafluoride SF6 or a gaseous mixture under pressure, allowing limit the formation of the electric arc.
  • an electrically insulating gas such as for example sulfur hexafluoride SF6 or a gaseous mixture under pressure
  • the fixed contact consists of a generally tubular element, commonly called “tulip”, in which the movable contact, consisting of an axial rod, is received.
  • the tulip may consist of a plurality of conductive lamellae extending parallel to the main axis of the apparatus, and whose free ends are folded radially towards the inside of the tulip, so that when the movable contact is inserted in the tulip, the lamellae deform elastically outwards.
  • the movable contact further consists of a rod, which may be solid or tubular, whose end is shaped tip or is angular to facilitate its connection with the fixed contact.
  • the particular form of the contacts in particular the angular shape of the end of the moving contact, favors the concentration of the electric charge of the moving contact at points or peaks thus formed, so that the electric arc is formed while the moving contact is still far from the fixed contact.
  • the risk of electrical "breakdown" and consequently the duration of the electric arc are relatively high compared to the total duration of a closing phase of the apparatus.
  • the electric arc causes significant wear of the fixed and movable contacts, it is therefore preferable to limit the duration of appearance of the arc to reduce the erosion of the fixed and movable contacts caused by the electric arc, as well as the pollution of the equipment, which increases the service life of the equipment.
  • the object of the invention is to propose electrical equipment for a transmission line of high-voltage current, which comprises means for delaying the instant of appearance of the arc, that is to say for the arc is formed or cuts at a close relative position of the contacts.
  • the document FR2344987 discloses a device according to the preamble of claim 1.
  • the invention proposes a high-voltage apparatus of main axis A having a longitudinal longitudinal contact, which is arranged at an upstream end of the apparatus and a movable contact which is arranged at a downstream end of the apparatus, which is movable.
  • the movable contact comprises an upstream axial rod whose upstream axial end is able to come into contact with the fixed contact, characterized in that the movable contact carries a corona-shielding component projecting radially from the upstream end of the rod, and an upstream face of the corona component, which is situated axially opposite the fixed contact. is smooth.
  • corona shielding element at the upstream end of the rod makes it possible to distribute the electric charge of the movable contact more evenly over a large area. Also, the presence of the corona shield limits the frequency of electrical breakdowns and also the duration of formation of an electric arc.
  • the corona shield consists of a cap projecting radially from the upstream end of the rod.
  • the corona cover is located axially recessed downstream from the upstream end of the rod.
  • the corona bonnet is of convex shape convex upstream.
  • the corona bonnet is mounted to slide axially on the rod and the bonnet and the rod comprise means for securing the bonnet with the rod in a disengageable manner so that the bonnet is integral with the rod moving upstream. up to an intermediate position and the rod moves upstream independently of the baffle cover beyond this intermediate position.
  • the securing means of the cover with the rod consist of a groove made in the rod and an elastic ring carried by the cover which is adapted to be received in the groove for securing the cover with the rod disengageably.
  • the fixed contact comprises a generally tubular element open downstream in which the upstream end of the rod is adapted to be received.
  • the upstream end of the rod carries a generally tubular element open towards the upstream
  • the fixed contact consists of a rod which is adapted to be received in said tubular element when the fixed contact is in contact with the movable contact.
  • the corona cover is located axially recessed downstream with respect to said tubular element.
  • the generally tubular element forms a tulip comprising a plurality of axial metal blades distributed circumferentially about the longitudinal main axis A.
  • the corona cover is adapted to come into contact with the fixed contact when the stationary contact is in contact with the movable contact.
  • the corona cover is at a distance from the fixed contact when the stationary contact is in contact with the movable contact.
  • an electrical apparatus 10 for a high-voltage electric power transmission line which here consists of an earthing switch.
  • the invention is not limited to an earthing switch and the apparatus 10 may be of any other type such as for example a disconnector or a circuit breaker.
  • the function of the earthing switch 10 is to electrically connect the live parts of an electric power line, which are at a certain electric potential, to earth, which is at a zero electric potential, in order to allow safe intervention on these parts of the transmission line.
  • the apparatus 10 consists of a generally elongate element of main axis A which is here oriented longitudinally.
  • the apparatus 10 comprises a fixed contact 12 which is arranged at an upstream axial end of the apparatus 10 with respect to the main axis A, here the left axial end in the figures, and which is connected to the live parts of FIG. the electric power line
  • the apparatus 10 also comprises a movable contact 22 which is arranged at the downstream axial end of the apparatus 10, here the right end, and which is here connected to the ground.
  • the fixed contact 12 comprises orifices 16 for connection to conductors of the current-carrying line and comprises a portion 14 of contact with the moving contact 22, which is oriented downstream.
  • the movable contact 22 is positioned axially vis-à-vis the contact portion 14 of the fixed contact 12 and it mainly comprises an axial rod 26 which extends axially upstream and whose upstream end 26a is adapted to come into permanent contact with the fixed contact 12.
  • rod will be used to designate both a solid rod that a hollow or tubular rod.
  • the apparatus 10 also comprises a fixed body 20 connected to the earth through which the movable contact 22 is guided in axial translation.
  • the movable contact 22 is electrically connected to the fixed body 20, for its connection to the ground.
  • the electrical connection between the movable contact 22 and the fixed contact 12 is effected by means of a generally annular component 30 which is commonly called “tulip" and in which an associated finger 32 is received.
  • the tulip 30 consists of a plurality of axial blades, that is to say parallel to the axis main A, which are distributed circumferentially around the longitudinal main axis A, forming a generally tubular element.
  • each lamella is located at a radial dimension with respect to the main axis A which is less than the outer radius of the finger 32.
  • the lamellae Due to their elastic deformation, the lamellae rest radially on the finger, thus maintaining an effective electrical contact.
  • the fixed contact 12 is electrically connected to the live parts of the power line and the movable contact 22 is electrically connected to earth, which is at zero electrical potential.
  • the movable contact 22 is displaced axially upstream until it comes into contact with the contact portion 14 of the fixed contact 12.
  • the potential difference between the fixed contact 12 and the movable contact 22 has the consequence that an electric arc occurs between the movable contact 22 and the fixed contact 12.
  • the movable contact 22 carries a corona shield 34 which is located radially around the upstream end 26a of the rod 26.
  • This corona-shielding component is preferably mounted on the upstream end 26a of the rod 26.
  • the corona shielding element is made such that the electric charge of the movable contact 22 is not concentrated on the end of the rod 26 but is distributed over a certain surface, to limit the possibility of occurrence of an arc electric.
  • the corona shielding element 34 is made in such a way that it has an upstream face 36 facing the stationary contact 12 and this upstream face 36 is substantially smooth, that is to say that it has no roughness at which the electric charge of the moving contact could be concentrated.
  • an electric arc is formed when the distance between the movable contact 22 and the fixed contact 12 is reduced compared to an apparatus according to the state of the art.
  • the fixed contact 12 and the movable contact 22 are made so that the tulip 30 is fixed, and forms the fixed contact 12.
  • the finger 32 is then carried by the rod 26, then forming the movable contact 22.
  • the corona shielding component is carried by the movable contact 22 and consists of a plate 34 extending radially around the finger 32, forming a corona shield.
  • the corona shield 34 consists of a generally radial disk, which is coaxial with the longitudinal main axis A.
  • the cover 34 is positioned axially recessed downstream with respect to the finger 32.
  • the cover 34 is further of convex shape curved upstream.
  • the curvature of the cover 34 is for example defined so that the cover 34 forms a sphere portion.
  • the corona shielding member is in the form of a radial ring which is located around the finger 32 and at a radial distance therefrom.
  • the axial position of the cover 34 in particular the distance between the cover 34 and the upstream end of the finger and, where appropriate, the radius of curvature of the disc, are defined so that the distance between the cover 34 and the fixed assembly is substantially equal to the distance between the upstream end of the finger 32 and the tulip 30.
  • the axial position of the cover 34 is defined such that the cover 34 does not come into contact with the fixed contact 12 when the apparatus 10 is closed.
  • the axial position of the cover 34 is defined such that the cover 34 is in contact with the fixed contact 12 when the apparatus 10 is closed.
  • FIGS. 3 and 4 another embodiment of the invention in which the hood The corona shield 34 is able to move axially upstream integrally from the rod 26 to a predefined intermediate position beyond which only the rod 26 slides upstream, the corona cover 34 remaining stationary. .
  • the invention is not limited to a corona shield component consisting of a plate as shown, and that the corona shielding member may have any other design such as for example a ring as described above.
  • This intermediate position is defined in such a way that the corona cover is at a distance from the fixed contact 12 and so that this distance between the corona cover 34 and the fixed contact 12 is less than the distance from which the electric arc forms.
  • the corona bonnet 34 is mounted to slide axially along the rod 26.
  • the cap 34 and the rod 26 comprise means for securing the cap with the rod during axial sliding upstream to the intermediate position. .
  • These securing means are disengageable, to allow the rod 26 to slide upstream independently of the cover 34, when this intermediate position has been crossed.
  • the securing means consist of an annular groove 38 which is formed in the cylindrical wall of the rod 26 and an elastic ring 40 which is carried by the hood 34 whose dimensions of the elastic ring 40 are complementary dimensions of the groove 38.
  • the disengagement of the securing means is effected by exiting the elastic ring 40 out of the groove 38.
  • the apparatus 10 comprises needles 42 which are fixed to the cover 34 and which extend axially downstream from a downstream face of the cover 34.
  • the needles 42 are integral with the cover and they are movable in translation relative to the fixed body 20 connected to the ground.
  • each needle 42 is able to come into abutment upstream against an associated face of the fixed body 20 when the rod and the cover 34 are in the predefined intermediate position.
  • the needles 42 block the cover in translation beyond the intermediate position. Consequently, the elastic ring 40 is out of the groove 38 so that the rod 26 continues to move upstream, independently of the cover 34.
  • the rod moves downstream, thereby breaking the contact with the fixed contact 12.
  • the upstream end of the rod 26 has a shoulder 46 which is adapted to abut against the cover 34. Also, when the rod is in the extreme downstream position, the cover 34 is clamped axially between the upstream end 26a of the rod and the fixed body.
  • the relative positions of the bearing faces, the groove and the elastic ring are defined so that in the extreme downstream position shown in FIG. figure 3 , the cover 34 and the rod are in a relative position for which the elastic ring is water level of the groove 38.
  • FIG. 2 Another embodiment of the invention according to which the corona shielding component is formed by the tulip 30.
  • the tulip 30 is mounted on the free end 26a of the rod 26 so that it is open upstream.
  • the tulip 30 is carried by the movable contact 22 and the finger 32 is a part of the fixed contact 12.
  • each lamella constituting the tulip 30 has a free upstream end face which is located opposite the fixed contact 12.
  • the upstream end face of each lamella is generally smooth, it is that is to say, it has no roughness, as described above, and the joining of the faces forms a smooth upstream annular surface facing the fixed assembly 12.
  • the charge of the moving assembly 20 is thus distributed over this annular surface, at the level of which one or more electric arcs are able to form.
  • the tulip 30 and the cap 34 are both carried by the rod 26 so that the tulip 30 is mounted at the free end of the rod 26 and the cap 34 is located axially in position. downstream withdrawal from tulip 30.
  • the electrical charge of the moving assembly 20 is distributed over an even larger surface, further delaying the moment of appearance of the electric arc when closing the apparatus or reducing the duration of formation of the electric arc when opening the switchgear 10.
  • the invention has been described with reference to an apparatus 10 which consists of an earthing switch having a fixed contact 12 which is connected to the live parts of the electric power transmission line and having a movable contact 22 which is connected to the ground. It will be understood that the invention is not limited to an earthing switch and that the switchgear 10 may be any other high voltage line switchgear such as a high voltage switch or line breaker.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)

Claims (8)

  1. Hochspannungsgerät (10) mit longitudinaler Hauptachse A, umfassend
    einen festen Kontakt (12), der an einem stromaufwärtigen Ende des Geräts (10) angeordnet ist, und
    einen beweglichen Kontakt (22), der an einem stromabwärtigen Ende des Geräts (10) angeordnet ist, der in dem Gerät (10) bewegbar ist zwischen einer stromaufwärtigen Position zum Schließen des Geräts (10), in der der bewegliche Kontakt (22) an den festen Kontakt (12) angeschlossen ist, und einer stromabwärtigen Position zum Öffnen des Geräts (10), in der der bewegliche Kontakt von dem festen Kontakt getrennt ist,
    wobei der bewegliche Kontakt (22) eine axiale Stange (26) umfasst, die sich stromaufwärts erstreckt, deren stromaufwärtiges axiales Ende (26a) dazu ausgelegt ist, in Kontakt mit dem festen Kontakt (12) zu gelangen,
    wobei der bewegliche Kontakt (22) eine Entladungsschutzkomponente (30, 34) trägt,
    dadurch gekennzeichnet, dass die Entladungsschutzkomponente an der Stange (26) derart befestigt ist, dass sie radial bezüglich des stromaufwärtigen Endes (26a) der Stange (26) vorsteht, und wobei eine stromaufwärtige Fläche (36) der Entladungsschutzkomponte (30, 34), die axial gegenüber dem festen Kontakt (12) angeordnet ist, glatt ist.
  2. Gerät (10) nach Anspruch 1, dadurch gekennzeichnet, dass die Entladungsschutzkomponente aus einer Kappe (34) besteht, die radial bezüglich des stromaufwärtigen Endes (26a) der Stange (26) vorsteht.
  3. Gerät (10) nach Anspruch 2, dadurch gekennzeichnet, dass die Entladungsschutzkappe (34) dazu ausgelegt ist, in Kontakt mit dem festen Kontakt (12) zu gelangen, wenn der feste Kontakt (12) in Kontakt mit dem beweglichen Kontakt (22) ist.
  4. Gerät (10) nach Anspruch 2, dadurch gekennzeichnet, dass die Entladungsschutzkappe (34) sich in einem Abstand von dem festen Kontakt (12) befindet, wenn der feste Kontakt (12) in Kontakt mit dem beweglichen Kontakt (22) ist.
  5. Gerät (10) nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass der feste Kontakt (12) ein im Wesentlichen röhrenförmiges Element (30) umfasst, das stromabwärts offen ist, in welchem das stromaufwärtige Ende (26a) der Stange (26) aufgenommen werden kann.
  6. Gerät (10) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das stromaufwärtige Ende (26a) der Stange (26) ein im Wesentlichen röhrenförmiges Element (30) trägt, das stromaufwärts offen ist, und dass der feste Kontakt (12) aus einer Stange (32) besteht, die dazu ausgelegt ist, in dem röhrenförmigen Element (30) aufgenommen zu sein, wenn der feste Kontakt (12) in Kontakt mit dem beweglichen Kontakt (22) ist.
  7. Gerät (10) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Entladungsschutzkappe (34) axial bezüglich des röhrenförmigen Elements (30) nach stromabwärts zurückgezogen angeordnet ist.
  8. Gerät (10) nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass das im Wesentlichen röhrenförmige Element (30) eine Tulpe bildet, die eine Mehrzahl von axialen metallischen Lamellen umfasst, welche in Umfangsrichtung um die longitudinale Hauptachse A herum verteilt sind.
EP12779073.1A 2011-11-03 2012-10-31 Elektrogerät mit vorrichtung zur begrenzung der bildung eines lichtbogens Active EP2774159B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1159946A FR2982412B1 (fr) 2011-11-03 2011-11-03 Appareillage electrique comportant des moyens pour limiter la formation d'un arc electrique
PCT/EP2012/071548 WO2013064532A1 (fr) 2011-11-03 2012-10-31 Appareillage electrique comportant des moyens pour limiter la formation d'un arc electrique

Publications (2)

Publication Number Publication Date
EP2774159A1 EP2774159A1 (de) 2014-09-10
EP2774159B1 true EP2774159B1 (de) 2015-09-16

Family

ID=47088892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12779073.1A Active EP2774159B1 (de) 2011-11-03 2012-10-31 Elektrogerät mit vorrichtung zur begrenzung der bildung eines lichtbogens

Country Status (5)

Country Link
EP (1) EP2774159B1 (de)
KR (1) KR20140097165A (de)
CN (1) CN104040663B (de)
FR (1) FR2982412B1 (de)
WO (1) WO2013064532A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018181503A (ja) * 2017-04-07 2018-11-15 三菱電機株式会社 回路遮断器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2344987A1 (fr) * 1976-03-15 1977-10-14 Merlin Gerin Sectionneur de mise a la terre pour poste blinde a haute tension
DE69527950T2 (de) * 1994-04-05 2003-01-02 Abb Power T & D Co Bewegbare gasmischplatte für autopneumatischen druckgasschalter
EP1691389B1 (de) * 2005-02-10 2011-04-06 ABB Technology AG Schaltkammer für einen gasisolierten Hochspannungsschalter
FR2906931B1 (fr) * 2006-10-09 2009-07-17 Areva T & D Sa Chambre de coupure avec cylindre repartiteur de champ pour disjoncteurs haute ou moyenne tension

Also Published As

Publication number Publication date
KR20140097165A (ko) 2014-08-06
WO2013064532A1 (fr) 2013-05-10
CN104040663A (zh) 2014-09-10
FR2982412A1 (fr) 2013-05-10
EP2774159A1 (de) 2014-09-10
FR2982412B1 (fr) 2014-12-26
CN104040663B (zh) 2018-01-02

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